Rewrite everything

Signed-off-by: Mattias Andrée <maandree@kth.se>

20 files changed, 1699 insertions, 2090 deletions

diff --git a/.gitignore b/.gitignore
index 892d3ac..fc30b43 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,23 +1,6 @@
-_/
-/bin/
-/aux/
-/obj/
-\#*\#
-.*
-!.git*
+*\#*
 *~
-*.bak
-*.new
-*.swo
-*.swp
-*.out
 *.o
+*.a
 *.su
-*.gch
-*.info
-*.pdf
-*.ps
-*.dvi
-/config.status
-/Makefile
-
+radharc
diff --git a/COPYING b/COPYING
deleted file mode 100644
index 94a9ed0..0000000
--- a/COPYING
+++ /dev/null
@@ -1,674 +0,0 @@
-                    GNU GENERAL PUBLIC LICENSE
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-later version.
-
-  15. Disclaimer of Warranty.
-
-  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
-APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
-HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
-OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
-THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
-PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
-IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
-ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
-
-  16. Limitation of Liability.
-
-  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
-WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
-THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
-GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
-USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
-DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
-PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
-EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
-SUCH DAMAGES.
-
-  17. Interpretation of Sections 15 and 16.
-
-  If the disclaimer of warranty and limitation of liability provided
-above cannot be given local legal effect according to their terms,
-reviewing courts shall apply local law that most closely approximates
-an absolute waiver of all civil liability in connection with the
-Program, unless a warranty or assumption of liability accompanies a
-copy of the Program in return for a fee.
-
-                     END OF TERMS AND CONDITIONS
-
-            How to Apply These Terms to Your New Programs
-
-  If you develop a new program, and you want it to be of the greatest
-possible use to the public, the best way to achieve this is to make it
-free software which everyone can redistribute and change under these terms.
-
-  To do so, attach the following notices to the program.  It is safest
-to attach them to the start of each source file to most effectively
-state the exclusion of warranty; and each file should have at least
-the "copyright" line and a pointer to where the full notice is found.
-
-    <one line to give the program's name and a brief idea of what it does.>
-    Copyright (C) <year>  <name of author>
-
-    This program is free software: you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation, either version 3 of the License, or
-    (at your option) any later version.
-
-    This program is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    GNU General Public License for more details.
-
-    You should have received a copy of the GNU General Public License
-    along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-Also add information on how to contact you by electronic and paper mail.
-
-  If the program does terminal interaction, make it output a short
-notice like this when it starts in an interactive mode:
-
-    <program>  Copyright (C) <year>  <name of author>
-    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
-    This is free software, and you are welcome to redistribute it
-    under certain conditions; type `show c' for details.
-
-The hypothetical commands `show w' and `show c' should show the appropriate
-parts of the General Public License.  Of course, your program's commands
-might be different; for a GUI interface, you would use an "about box".
-
-  You should also get your employer (if you work as a programmer) or school,
-if any, to sign a "copyright disclaimer" for the program, if necessary.
-For more information on this, and how to apply and follow the GNU GPL, see
-<http://www.gnu.org/licenses/>.
-
-  The GNU General Public License does not permit incorporating your program
-into proprietary programs.  If your program is a subroutine library, you
-may consider it more useful to permit linking proprietary applications with
-the library.  If this is what you want to do, use the GNU Lesser General
-Public License instead of this License.  But first, please read
-<http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/INSTALL b/INSTALL
deleted file mode 100644
index e632718..0000000
--- a/INSTALL
+++ /dev/null
@@ -1,83 +0,0 @@
-Type './configure --help' for configuration options. The normal settings for a
-GNU package should work. If not, please make a bug report.
-
-	On a common GNU/Linux distribution the following should
-	be sufficient for most users:
-
-		./configure --prefix=/usr
-		make
-		make install DESTDIR="somewhere you want the files for now"
-		# Now let the package manager put the files in place...
-
-	Or for an unstaged install:
-
-		./configure --prefix=/usr
-		make
-		sudo make install
-
-By default any applicable pre-install, post-install, pre-uninstall, and
-post-install commands is run. This suppress these, run 'make' with 'N=true'
-or 'N=:'. IF you want to know which these commands are, you can use the
-methods specificed in the GNU Coding Standards. Another method is found in
-mk/README. However, for this packages, these will be:
-
-	infodir="usr/local/share/info" ## Assuming default prefix.
-	
-	post_install () {
-	  install-info -- "${infodir}/radharc.info" "${infodir}/dir"
-	}
-	
-	pre_uninstall () {
-	  install-info --delete -- "${infodir}/radharc.info" "${infodir}/dir"
-	}
-
-
-────────────────────────────────────────────────────────────────────────────────
-CUSTOMISED COMPILATION
-────────────────────────────────────────────────────────────────────────────────
-
-The makefile is configured to compile the C code with -O2 -g, you can
-change this by setting OPTIMISE, or with CFLAGS and LDFLAGS if you want
-to change all optional flags compiling and linking flags:
-
-	./configure OPTIMISE="-Og -g"
-
-
-────────────────────────────────────────────────────────────────────────────────
-CUSTOMISED INSTALLATION
-────────────────────────────────────────────────────────────────────────────────
-
-If you want to install absolutely everything, you can
-instead use the commands below:
-
-	make everything
-	make install-everything DESTDIR="pkg"
-
-Or if you only want to absolute basics:
-
-	make base
-	make install-base DESTDIR="pkg"
-
-You can select freely what parts of the package to install and not
-to install. This rules are available:
-
-┌─────────────┬─────────────────────┬────────────────────────────────────────────┐
-│ COMPILATION │ INSTALLATION        │ DESCRIPTION                                │
-├─────────────┼─────────────────────┼────────────────────────────────────────────┤
-│ base        │ install-base        │ Install the basics:                        │
-│   cmd       │   install-cmd       │   Install the radharc commands.            │
-│             │   install-copyright │   Install the Expat License.               │
-│ doc         │ install-doc         │ Include all manuals:                       │
-│   info      │   install-info      │   Include info manual. (Texinfo)           │
-│   dvi       │   install-dvi       │   Include DVI manual. (Texinfo)            │
-│   pdf       │   install-pdf       │   Include PDF manual. (Texinfo)            │
-│   ps        │   install-ps        │   Include PostScript manual. (Texinfo)     │
-│   html      │   install-html      │   Include multifile HTML manual. (Texinfo) │
-│             │   install-man       │   Include man pages.                       │
-│ locale      │ install-locale      │ Include locales.                           │
-└─────────────┴─────────────────────┴────────────────────────────────────────────┘
-
-install, install-everything, install-base, and install-cmd, have alternatives
-that installs a stripped binary: install-strip, install-everything-strip,
-install-base-strip, and install-cmd-strip, respectively.
-
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..c437151
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,15 @@
+ISC License
+
+© 2019 Mattias Andrée <maandree@kth.se>
+
+Permission to use, copy, modify, and/or distribute this software for any
+purpose with or without fee is hereby granted, provided that the above
+copyright notice and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..64843a7
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,29 @@
+.POSIX:
+
+CONFIGFILE = config.mk
+include $(CONFIGFILE)
+
+OBJ =\
+	cg-base.o\
+	radharc.o
+
+HDR =\
+	arg.h\
+	cg-base.h
+
+all: radharc
+$(OBJ): $(@:.o=.c) $(HDR)
+
+.c.o:
+	$(CC) -c -o $@ $< $(CPPFLAGS) $(CFLAGS)
+
+radharc: $(OBJ)
+	$(CC) -o $@ $(OBJ) $(LDFLAGS)
+
+clean:
+	-rm -f -- radharc *.o
+
+.SUFFIXES:
+.SUFFIXES: .c .o
+
+.PHONY: all check install uninstall clean
diff --git a/NEWS b/NEWS
deleted file mode 100644
index e07540c..0000000
--- a/NEWS
+++ /dev/null
@@ -1,6 +0,0 @@
-radharc NEWS                                          -*- outline -*-
-
-* Noteworthy changes in release 1.0 (TO BE DETERMINED) [stable]
-
-  Initial release.
-
diff --git a/README b/README
deleted file mode 100644
index be663a0..0000000
--- a/README
+++ /dev/null
@@ -1,181 +0,0 @@
-NAME
-	radharc - Reduce eye strain and improve sleep.
-
-PRONUNCIATION
-	ɹˈaɪɐrk (depending on dialect)
-
-SYNOPSIS
-	radharc [OPTIONS]...
-
-	The -l option is mandatory, unless single value -t is used.
-
-OPTIONS
-	-l LATITUDE:LONGITUDE
-		Tell radharc where you are. This is mandatory.
-		The values are measured in degrees and in the
-		GPS (you probably do not have too care about that,
-		the differences between the systems should not
-		be significant another), and must be in decimal.
-
-		Reminder for Americans (particularly US Americans),
-		you are an the western hemisphere, not the eastern,
-		thus your longtiude is negative. If you experience
-		weird colour temperatures, 100 % of the times it is
-		because you forgot the minus sign. But no need to
-		feel stupid, it is a really common mistake.
-
-		No complicated stuff please, only latitudes within
-		±90° and longitudes within ±180°. No unit thought.
-
-	-t DAY:NIGHT
-		Select colour temperature to use during full daytime
-		and full night. This should be a integer. Do not
-		include the unit (the 'K'). The temperatures must
-		be at least 1000 K.
-
-	-t TEMPERATURE
-		Select temperature to use. The program will exit
-		when it is done setting the temperature. The
-		natural colour temperature is 6500 K ('-t 6500').
-		The temperature must be at least 1000 K.
-
-	-t +DELTA
-		Increase the colour temperature by DELTA kelvin.
-
-	-t -DELTA
-		Decrease the colour temperature by DELTA kelvin.
-
-	-T TEMPERATURE
-		Temperature that shall be used when the program
-		is disabled (via SIGUSR1).
-
-	-p	Print the current status.
-
-	-n	Set the temperature immediately, do not transition.
-
-	-N	Do not transition when exiting, disabling, or
-		reenabling.
-
-	-o	Set the colour, and exit.
-
-	-x	Ignore the current calibrations on the monitors.
-
-	-s SECONDS
-		The start and exit transitions shall take SECONDS
-		seconds. This may be a floating point number, with
-		an explicit unit.
-
-	-S KELVINS
-		The transitions speed, in kelvin per second.
-		This most be a positive integer.
-
-	-i
-		Apply negative image filter. Radharc will detect
-		which monitors have this one when it starts.
-
-	-h PATHNAME
-		Use a hook script for events.
-
-	-b
-		Broadcast events with bus.
-
-	-d SERVER=DISPLAY
-		Use the display server whose identifier is
-		DISPLAY and whose identifier is stored in the
-		environment variable SERVER, for example
-		-d DISPLAY=:0 for the X display :0.
-
-	-d SYSTEM
-		Use a subsystem which does not have identifiers.
-		For example 'drm' for the Direct Rendering Manager.
-		You can also select 'none', this is useful if you
-		don't want any adjustments, but want events to be
-		broadcasted.
-
-	-e EDID
-		Select monitor to use by its EDID.
-
-	-m NUM
-		Select monitor to use by its global index.
-
-	-m SCREEN:NUM
-		Select monitor to use by its index without
-		a screen or graphic card. The later is for when
-		not inside a graphics environment.
-
-	All options also have a '+' variant, for example '+n'.
-	These undo the affect of previous '-' variant.
-	'+d', '+e', and '+m' all undo the affect of all previous
-	'-d', '-e', and '-m' options (not respectively).
-	Additionally, with the exception of '-d', '-e', '-m',
-	subsequent options override the previous of the the option.
-
-SIGNALS
-	SIGHUP
-		Perform an online update to a newer version.
-
-	SIGUSR1
-		Enable or disable radharc.
-
-	SIGUSR2
-		Toggle negative image filter. Enable on all
-		monitors if it is enable on some but not all.
-
-	SIGRTMIN+N
-		Toggle negative image on monitor N, if monitors
-		have been selected manually, it will be in the
-		order they where selected.
-
-ENVIRONMENT
-	XDG_RUNTIME_DIR
-		This environment variable names the directory in which
-		the state file is stored. If unset or empty, /run is
-		used.
-
-	RADHARC_STATE
-		The pathname to the state file, will be determined
-		automatically if not set. If not set, you may only
-		have one instance running per display server instance.
-
-RATIONALE
-	Your location is determined use GeoClue because it clunky,
-	unreliable, inaccurate and requires an Internet connection
-	or GPS device, it is way to common that neither is available.
-	And I do not want to handle all bug reports for this. Besides,
-	you can use an external program.
-
-	Your timezone is used to determine your location approximately
-	when not specified, You can be a really poor approximation.
-	It is too much work supporting summer time, especially when
-	summer time is not necessarily +1 hour, additionally you can
-	have scheme where it is first normal time, then summer time,
-	then double summer time, then back to summer time, and the back
-	normal time; complicated stuff, additionally, the Russian
-	Federation is in permanent summer time. And have you heard about
-	the People's Republic of China (not to be confused with the
-	less known Republic of China,) they have one timezone, which is
-	far from in the middle of the country. You can use an external
-	program. To keep it simple, we are not even using your timezone
-	to santity check your specified location.
-
-NOTES
-	I suggest using a local script named radharc that sets all
-	options for you.
-
-KNOWN ISSUES
-	In X.org, the gamma ramps do not apply to hardware cursors,
-	because the developers thinks it is the graphics drivers
-	that shall fix this, and they are not accepting patches for
-	this. You can use xorg-server-hwcursor-gamma, however, that
-	patched version does not apply apply the gamma ramps until
-	the cursor changes image. You can also use sortware cursors
-	if this really bothers you.
-
-	Wayland does not support this because it [Wayland] sucks.
-
-	Haiku does not support this yet.
-
-SEE ALSO
-	redshift(1), blueshift(1), redshift-adjust(1), nightshift(1),
-	locateme(1)
-
diff --git a/arg.h b/arg.h
new file mode 100644
index 0000000..aeab52a
--- /dev/null
+++ b/arg.h
@@ -0,0 +1,63 @@
+/*
+ * Copy me if you can.
+ * by 20h
+ */
+
+#ifndef ARG_H__
+#define ARG_H__
+
+extern char *argv0;
+
+/* use main(int argc, char *argv[]) */
+#define ARGBEGIN	for (argv0 = *argv, argv++, argc--;\
+					argv[0] && argv[0][0] == '-'\
+					&& argv[0][1];\
+					argc--, argv++) {\
+				char argc_;\
+				char **argv_;\
+				int brk_;\
+				if (argv[0][1] == '-' && argv[0][2] == '\0') {\
+					argv++;\
+					argc--;\
+					break;\
+				}\
+				for (brk_ = 0, argv[0]++, argv_ = argv;\
+						argv[0][0] && !brk_;\
+						argv[0]++) {\
+					if (argv_ != argv)\
+						break;\
+					argc_ = argv[0][0];\
+					switch (argc_)
+
+/* Handles obsolete -NUM syntax */
+#define ARGNUM				case '0':\
+					case '1':\
+					case '2':\
+					case '3':\
+					case '4':\
+					case '5':\
+					case '6':\
+					case '7':\
+					case '8':\
+					case '9'
+
+#define ARGEND			}\
+			}
+
+#define ARGC()		argc_
+
+#define ARGNUMF(base)	(brk_ = 1, estrtol(argv[0], (base)))
+
+#define EARGF(x)	((argv[0][1] == '\0' && argv[1] == NULL)?\
+				((x), abort(), (char *)0) :\
+				(brk_ = 1, (argv[0][1] != '\0')?\
+					(&argv[0][1]) :\
+					(argc--, argv++, argv[0])))
+
+#define ARGF()		((argv[0][1] == '\0' && argv[1] == NULL)?\
+				(char *)0 :\
+				(brk_ = 1, (argv[0][1] != '\0')?\
+					(&argv[0][1]) :\
+					(argc--, argv++, argv[0])))
+
+#endif
diff --git a/cg-base.c b/cg-base.c
new file mode 100644
index 0000000..9f77937
--- /dev/null
+++ b/cg-base.c
@@ -0,0 +1,927 @@
+/**
+ * cg-tools -- Cooperative gamma-enabled tools
+ * Copyright (C) 2016, 2018  Mattias Andrée (maandree@kth.se)
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include "cg-base.h"
+
+#include <libclut.h>
+
+#include <alloca.h>
+#include <errno.h>
+#include <inttypes.h>
+#include <poll.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+
+
+/**
+ * The process's name
+ */
+const char* argv0 = NULL;
+
+/**
+ * The libcoopgamma context
+ */
+libcoopgamma_context_t cg;
+
+/**
+ * The names of the selected CRTC:s
+ */
+char** crtcs = NULL;
+
+/**
+ * Gamma ramp updates for each CRTC
+ */
+filter_update_t* crtc_updates = NULL;
+
+/**
+ * CRTC and monitor information about
+ * each selected CRTC and connect monitor
+ */
+libcoopgamma_crtc_info_t* crtc_info = NULL;
+
+/**
+ * The number of selected CRTC:s
+ */
+size_t crtcs_n = 0;
+
+/**
+ * The number of filters
+ */
+size_t filters_n = 0;
+
+
+/**
+ * Contexts for asynchronous ramp updates
+ */
+static libcoopgamma_async_context_t* asyncs = NULL;
+
+/**
+ * The number of pending receives
+ */
+static size_t pending_recvs = 0;
+
+/**
+ * Whether message must be flushed
+ */
+static int flush_pending = 0;
+
+
+
+/**
+ * Data used to sort CRTC:s
+ */
+struct crtc_sort_data
+{
+  /**
+   * The gamma ramp type
+   */
+  libcoopgamma_depth_t depth;
+  
+  /**
+   * Should be 0
+   */
+  int __padding;
+  
+  /**
+   * The size of the red gamma ramp
+   */
+  size_t red_size;
+  
+  /**
+   * The size of the green gamma ramp
+   */
+  size_t green_size;
+  
+  /**
+   * The size of the blue gamma ramp
+   */
+  size_t blue_size;
+  
+  /**
+   * The index of the CRTC
+   */
+  size_t index;
+};
+
+
+
+/**
+ * Compare two strings
+ * 
+ * @param   a  Return -1 if this string is `NULL` or less than `b`
+ * @param   b  Return +1 if this string is less than `a`
+ * @return     See `a` and `b`, 0 is returned if `a` and `b` are equal
+ */
+static int nulstrcmp(const char *a, const char *b)
+{
+  return (a == NULL) ? -1 : strcmp(a, b);
+}
+
+
+/**
+ * Compare two instances of `crtc_sort_data`
+ * 
+ * @param   a_  Return -1 if this one is lower
+ * @param   b_  Return +1 if this one is higher
+ * @return      See `a_` and `b_`, only -1 or +1 can be returned
+ */
+static int crtc_sort_data_cmp(const void* a_, const void* b_)
+{
+  const struct crtc_sort_data* a = a_;
+  const struct crtc_sort_data* b = b_;
+  int cmp = memcmp(a, b, sizeof(*a) - sizeof(a->index));
+  return cmp ? cmp : a->index < b->index ? -1 : +1;
+}
+
+
+/**
+ * Make elements in `crtc_updates` slaves where appropriate
+ * 
+ * @return  Zero on success, -1 on error
+ */
+int make_slaves(void)
+{
+  struct crtc_sort_data* data;
+  size_t i, j, n = 0, master = 0, master_i;
+  
+  data = alloca(filters_n * sizeof(*data));
+  memset(data, 0, filters_n * sizeof(*data));
+  for (i = 0; i < filters_n; i++)
+    {
+      if (!(crtc_info[crtc_updates[i].crtc].supported))
+	continue;
+      
+      data[n].depth      = crtc_updates[i].filter.depth;
+      data[n].red_size   = crtc_updates[i].filter.ramps.u8.red_size;
+      data[n].green_size = crtc_updates[i].filter.ramps.u8.green_size;
+      data[n].blue_size  = crtc_updates[i].filter.ramps.u8.blue_size;
+      data[n].index      = i;
+      n++;
+    }
+  
+  qsort(data, n, sizeof(*data), crtc_sort_data_cmp);
+  if (n == 0)
+    return 0;
+  
+  master_i = data[0].index;
+  for (i = 1; i < n; i++)
+    if (memcmp(data + i, data + master, sizeof(*data) - sizeof(data->index)))
+      {
+	if (master + 1 < i)
+	  {
+	    crtc_updates[master_i].slaves = calloc(i - master, sizeof(size_t));
+	    if (crtc_updates[master_i].slaves == NULL)
+	      return -1;
+	    for (j = 1; master + j < i; j++)
+	      crtc_updates[master_i].slaves[j - 1] = data[master + j].index;
+	  }
+	master = i;
+	master_i = data[master].index;
+      }
+    else
+      {
+	libcoopgamma_ramps_destroy(&(crtc_updates[data[i].index].filter.ramps.u8));
+	crtc_updates[data[i].index].master = 0;
+	crtc_updates[data[i].index].filter.ramps.u8 = crtc_updates[master_i].filter.ramps.u8;
+      }
+  
+  if (master + 1 < i)
+    {
+      crtc_updates[master_i].slaves = calloc(i - master, sizeof(size_t));
+      if (crtc_updates[master_i].slaves == NULL)
+	return -1;
+      for (j = 1; master + j < i; j++)
+	crtc_updates[master_i].slaves[j - 1] = data[master + j].index;
+    }
+  
+  return 0;
+}
+
+
+/**
+ * Update a filter and synchronise calls
+ * 
+ * @param   index    The index of the CRTC
+ * @param   timeout  The number of milliseconds a call to `poll` may block,
+ *                   -1 if it may block forever
+ * @return           1: Success, no pending synchronisations
+ *                   0: Success, with still pending synchronisations
+ *                   -1: Error, `errno` set
+ *                   -2: Error, `cg.error` set
+ * 
+ * @throws  EINTR   Call to `poll` was interrupted by a signal
+ * @throws  EAGAIN  Call to `poll` timed out
+ */
+int update_filter(size_t index, int timeout)
+{
+  filter_update_t* filter = crtc_updates + index;
+  
+  if (!(filter->synced) || filter->failed)
+    abort();
+  
+  pending_recvs += 1;
+  
+  if (libcoopgamma_set_gamma_send(&(filter->filter), &cg, asyncs + index) < 0)
+    switch (errno)
+      {
+      case EINTR:
+      case EAGAIN:
+#if EAGAIN != EWOULDBLOCK
+      case EWOULDBLOCK:
+#endif
+	flush_pending = 1;
+	break;
+      default:
+	return -1;
+      }
+  
+  filter->synced = 0;
+  return synchronise(timeout);
+}
+
+
+/**
+ * Synchronised calls
+ * 
+ * @param   timeout  The number of milliseconds a call to `poll` may block,
+ *                   -1 if it may block forever
+ * @return           1: Success, no pending synchronisations
+ *                   0: Success, with still pending synchronisations
+ *                   -1: Error, `errno` set
+ *                   -2: Error, `cg.error` set
+ * 
+ * @throws  EINTR   Call to `poll` was interrupted by a signal
+ * @throws  EAGAIN  Call to `poll` timed out
+ */
+int synchronise(int timeout)
+{
+  struct pollfd pollfd;
+  size_t selected;
+  
+  pollfd.fd = cg.fd;
+  pollfd.events = POLLIN | POLLRDNORM | POLLRDBAND | POLLPRI;
+  if (flush_pending > 0)
+    pollfd.events |= POLLOUT;
+  
+  pollfd.revents = 0;
+  if (poll(&pollfd, (nfds_t)1, timeout) < 0)
+    return -1;
+  
+  if (pollfd.revents & (POLLOUT | POLLERR | POLLHUP | POLLNVAL))
+    {
+      if (libcoopgamma_flush(&cg) < 0)
+	goto sync;
+      flush_pending = 0;
+    }
+  
+  if ((timeout < 0) && (pending_recvs > 0))
+    if (!(pollfd.revents & (POLLIN | POLLRDNORM | POLLRDBAND | POLLPRI)))
+      {
+	pollfd.revents = 0;
+	if (poll(&pollfd, (nfds_t)1, -1) < 0)
+	  return -1;
+      }
+  
+ sync:
+  if (pollfd.revents & (POLLIN | POLLRDNORM | POLLRDBAND | POLLPRI | POLLERR | POLLHUP | POLLNVAL))
+    for (;;)
+      {
+	if (libcoopgamma_synchronise(&cg, asyncs, filters_n, &selected) < 0)
+	  {
+	    if (errno == 0)
+	      continue;
+	    else
+	      goto fail;
+	  }
+	if (crtc_updates[selected].synced)
+	  continue;
+	crtc_updates[selected].synced = 1;
+	pending_recvs -= 1;
+	if (libcoopgamma_set_gamma_recv(&cg, asyncs + selected) < 0)
+	  {
+	    if (cg.error.server_side)
+	      {
+		crtc_updates[selected].error = cg.error;
+		crtc_updates[selected].failed = 1;
+		memset(&(cg.error), 0, sizeof(cg.error));
+	      }
+	    else
+	      goto cg_fail;
+	  }
+      }
+  
+  return pending_recvs == 0;
+ cg_fail:
+  return -2;
+ fail:
+  switch (errno)
+    {
+    case EINTR:
+    case EAGAIN:
+#if EAGAIN != EWOULDBLOCK
+    case EWOULDBLOCK:
+#endif
+      return pending_recvs == 0;
+    default:
+      return -1;
+    }
+}
+
+
+/**
+ * Initialise the process, specifically
+ * reset the signal mask and signal handlers
+ * 
+ * @return  Zero on success, -1 on error
+ */
+static int initialise_proc(void)
+{
+  sigset_t sigmask;
+  int sig;
+  
+  for (sig = 1; sig < _NSIG; sig++)
+    if (signal(sig, SIG_DFL) == SIG_ERR)
+      if (sig == SIGCHLD)
+	return -1;
+  
+  if (sigemptyset(&sigmask) < 0)
+    return -1;
+  if (sigprocmask(SIG_SETMASK, &sigmask, NULL) < 0)
+    return -1;
+  
+  return 0;
+}
+
+
+/**
+ * Print, to stdout, a list of all
+ * recognised adjustment methods
+ * 
+ * @return  Zero on success, -1 on error
+ */
+static int list_methods(void)
+{
+  char** list;
+  size_t i;
+  
+  list = libcoopgamma_get_methods();
+  if (list == NULL)
+    return -1;
+  for (i = 0; list[i]; i++)
+    printf("%s\n", list[i]);
+  free(list);
+  if (fflush(stdout) < 0)
+    return -1;
+  
+  return 0;
+}
+
+
+/**
+ * Print, to stdout, a list of all CRTC:s
+ * 
+ * A connection to the coopgamma server
+ * must have been made
+ * 
+ * @return  Zero on success, -1 on error, -2
+ *          on libcoopgamma error
+ */
+static int list_crtcs(void)
+{
+  char** list;
+  size_t i;
+  
+  list = libcoopgamma_get_crtcs_sync(&cg);
+  if (list == NULL)
+    return -2;
+  for (i = 0; list[i]; i++)
+    printf("%s\n", list[i]);
+  free(list);
+  if (fflush(stdout) < 0)
+    return -1;
+  
+  return 0;
+}
+
+
+/**
+ * Fill the list of CRTC information
+ * 
+ * @return  Zero on success, -1 on error, -2
+ *          on libcoopgamma error
+ */
+static int get_crtc_info(void)
+{
+  size_t i, unsynced = 0, selected;
+  char* synced;
+  int need_flush = 0;
+  struct pollfd pollfd;
+  
+  synced = alloca(crtcs_n * sizeof(*synced));
+  memset(synced, 0, crtcs_n * sizeof(*synced));
+  
+  i = 0;
+  pollfd.fd = cg.fd;
+  pollfd.events = POLLIN | POLLRDNORM | POLLRDBAND | POLLPRI;
+  
+  while ((unsynced > 0) || (i < crtcs_n))
+    {
+    wait:
+      if (i < crtcs_n)
+	pollfd.events |= POLLOUT;
+      else
+	pollfd.events &= ~POLLOUT;
+      
+      pollfd.revents = 0;
+      if (poll(&pollfd, (nfds_t)1, -1) < 0)
+	goto fail;
+      
+      if (pollfd.revents & (POLLOUT | POLLERR | POLLHUP | POLLNVAL))
+	{
+	  if (need_flush && (libcoopgamma_flush(&cg) < 0))
+	    goto send_fail;
+	  need_flush = 0;
+	  for (; i < crtcs_n; i++)
+	    if (unsynced++, libcoopgamma_get_gamma_info_send(crtcs[i], &cg, asyncs + i) < 0)
+	      goto send_fail;
+	  goto send_done;
+	send_fail:
+	  switch (errno)
+	    {
+	    case EINTR:
+	    case EAGAIN:
+#if EAGAIN != EWOULDBLOCK
+	    case EWOULDBLOCK:
+#endif
+	      i++;
+	      need_flush = 1;
+	      break;
+	    default:
+	      goto fail;
+	    }
+	}
+    send_done:
+      
+      if ((unsynced == 0) && (i == crtcs_n))
+	break;
+      
+      if (pollfd.revents & (POLLIN | POLLRDNORM | POLLRDBAND | POLLPRI))
+	while (unsynced > 0)
+	  switch (libcoopgamma_synchronise(&cg, asyncs, i, &selected))
+	    {
+	    case 0:
+	      if (synced[selected])
+		{
+		  libcoopgamma_skip_message(&cg);
+		  break;
+		}
+	      synced[selected] = 1;
+	      unsynced -= 1;
+	      if (libcoopgamma_get_gamma_info_recv(crtc_info + selected, &cg, asyncs + selected) < 0)
+		goto cg_fail;
+	      break;
+	    case -1:
+	      switch (errno)
+		{
+		case 0:
+		  break;
+		case EINTR:
+		case EAGAIN:
+#if EAGAIN != EWOULDBLOCK
+		case EWOULDBLOCK:
+#endif
+		  goto wait;
+		default:
+		  goto fail;
+		}
+	      break;
+	    }
+    }
+  
+  return 0;
+ fail:
+  return -1;
+ cg_fail:
+  return -2;
+}
+
+
+/**
+ * -M METHOD
+ *     Select adjustment method. If METHOD is "?",
+ *     available methods will be printed to stdout.
+ * 
+ * -S SITE
+ *     Select site (display server instance).
+ * 
+ * -c CRTC
+ *     Select CRT controller. If CRTC is "?", CRTC:s
+ *     will be printed to stdout.
+ *     
+ *     This option can be used multiple times. If it
+ *     is not used at all, all CRTC:s will be selected.
+ * 
+ * -p PRIORITY
+ *     Select the priority for the filter, this should
+ *     be a signed two's-complement integer. If
+ *     PRIORITY is "?", the default priority for the
+ *     program is printed to stdout.
+ * 
+ * -R RULE
+ *     The rule of the filter, that is, the last part
+ *     of the class which is its identifier. If RULE
+ *     is "?" the default rule is printed to stdout,
+ *     if RULE is "??" the default class is printed
+ *     to stdout.
+ * 
+ * @param   argc  The number of command line arguments
+ * @param   argv  The command line arguments
+ * @return        0 on success, 1 on error
+ */
+int main(int argc, char* argv[])
+{
+  int stage = 0;
+  int dealloc_crtcs = 0;
+  int rc = 0;
+  char* method = NULL;
+  char* site = NULL;
+  size_t crtc_i = 0;
+  int64_t priority = default_priority;
+  char* prio = NULL;
+  char* rule = NULL;
+  char* class = default_class;
+  char** classes = NULL;
+  size_t classes_n = 0;
+  int explicit_crtcs = 0;
+  int have_crtc_q = 0;
+  size_t i, filter_i;
+  
+  argv0 = *argv++, argc--;
+  
+  if (initialise_proc() < 0)
+    goto fail;
+  
+  crtcs = alloca(argc * sizeof(*crtcs));
+  
+  for (; *argv; argv++, argc--)
+    {
+      char* args = *argv;
+      char opt[3];
+      if (!strcmp(args, "--"))
+	{
+	  argv++, argc--;
+	  break;
+	}
+      opt[0] = *args++;
+      opt[2] = '\0';
+      if ((*opt != '-') && (*opt != '+'))
+	break;
+      while (*args)
+	{
+	  char* arg;
+	  int at_end;
+	  opt[1] = *args++;
+	  arg = args;
+	  if ((at_end = !*arg))
+	    arg = argv[1];
+	  if (!strcmp(opt, "-M"))
+	    {
+	      if ((method != NULL) || ((method = arg) == NULL))
+		usage();
+	    }
+	  else if (!strcmp(opt, "-S"))
+	    {
+	      if ((site != NULL) || ((site = arg) == NULL))
+		usage();
+	    }
+	  else if (!strcmp(opt, "-c"))
+	    {
+	      if (arg == NULL)
+		usage();
+	      crtcs[crtc_i++] = arg;
+	      explicit_crtcs = 1;
+	      if (!have_crtc_q && !strcmp(arg, "?"))
+		have_crtc_q = 1;
+	    }
+	  else if (!strcmp(opt, "-p"))
+	    {
+	      if ((prio != NULL) || ((prio = arg) == NULL))
+		usage();
+	    }
+	  else if (!strcmp(opt, "-R"))
+	    {
+	      if ((rule != NULL) || ((rule = arg) == NULL))
+		usage();
+	    }
+	  else
+	    switch (handle_opt(opt, arg))
+	      {
+	      case 0:
+		goto next_opt;
+	      case 1:
+		break;
+	      default:
+		goto fail;
+	      }
+	  argv += at_end;
+	  argc -= at_end;
+	  break;
+	next_opt:;
+	}
+    }
+  
+  crtcs_n = crtc_i;
+  crtcs[crtc_i] = NULL;
+  if (!have_crtc_q && nulstrcmp(method, "?") &&
+      nulstrcmp(rule, "?") && nulstrcmp(rule, "??") &&
+      ((default_priority == NO_DEFAULT_PRIORITY) || nulstrcmp(prio, "?")))
+    if (handle_args(argc, argv, prio) < 0)
+      goto fail;
+  
+  if (default_priority != NO_DEFAULT_PRIORITY)
+    {
+      if (!nulstrcmp(prio, "?"))
+	{
+	  printf("%" PRIi64 "\n", priority);
+	  return 0;
+	}
+      else if (prio != NULL)
+	{
+	  char *end;
+	  errno = 0;
+	  priority = (int64_t)strtoll(prio, &end, 10);
+	  if (errno || *end || !*prio)
+	    usage();
+	}
+    }
+  
+  if (!nulstrcmp(rule, "??"))
+    {
+      size_t i;
+      if (*class_suffixes == NULL)
+	printf("%s\n", class);
+      else
+	for (i = 0; class_suffixes[i] != NULL; i++)
+	  printf("%s%s\n", class, class_suffixes[i]);
+      return 0;
+    }
+  else if (!nulstrcmp(rule, "?"))
+    {
+      printf("%s\n", strstr(strstr(class, "::") + 2, "::") + 2);
+      return 0;
+    }
+  else if (rule != NULL)
+    {
+      char* p = strstr(strstr(class, "::") + 2, "::") + 2;
+      size_t n = (size_t)(p - class);
+      class = alloca(strlen(rule) + n + (size_t)1);
+      memcpy(class, default_class, n);
+      strcpy(class + n, rule);
+      if (strchr(class, '\n'))
+	{
+	  fprintf(stderr, "%s: LF character is not allowed in the filter's class\n", argv0);
+	  goto custom_fail;
+	}
+    }
+  
+  if (!nulstrcmp(method, "?"))
+    {
+      if (list_methods() < 0)
+	goto fail;
+      return 0;
+    }
+  
+  if (libcoopgamma_context_initialise(&cg) < 0)
+    goto fail;
+  stage++;
+  if (libcoopgamma_connect(method, site, &cg) < 0)
+    {
+      fprintf(stderr, "%s: server failed to initialise\n", argv0);
+      goto custom_fail;
+    }
+  stage++;
+  
+  if (have_crtc_q)
+    switch (list_crtcs())
+      {
+      case 0:
+	goto done;
+      case -1:
+	goto fail;
+      default:
+	goto cg_fail;
+      }
+  
+  if (crtcs_n == 0)
+    {
+      crtcs = libcoopgamma_get_crtcs_sync(&cg);
+      if (crtcs == NULL)
+	goto cg_fail;
+      dealloc_crtcs = 1;
+      for (; crtcs[crtcs_n] != NULL; crtcs_n++);
+    }
+  
+  if (crtcs_n == 0)
+    {
+      fprintf(stderr, "%s: no CRTC:s are available\n", argv0);
+      goto custom_fail;
+    }
+  
+  if (*class_suffixes == NULL)
+    {
+      classes = &class;
+      classes_n = 1;
+    }
+  else
+    {
+      size_t len = strlen(class);
+      while (class_suffixes[classes_n])
+	classes_n++;
+      classes = alloca(classes_n * sizeof(*classes));
+      for (i = 0; i < classes_n; i++)
+	{
+	  classes[i] = alloca(len + strlen(class_suffixes[i]) + sizeof(":"));
+	  stpcpy(stpcpy(stpcpy(classes[i], class), ":"), class_suffixes[i]);
+	}
+    }
+  filters_n = classes_n * crtcs_n;
+  
+  crtc_info = alloca(crtcs_n * sizeof(*crtc_info));
+  memset(crtc_info, 0, crtcs_n * sizeof(*crtc_info));
+  for (crtc_i = 0; crtc_i < crtcs_n; crtc_i++)
+    if (libcoopgamma_crtc_info_initialise(crtc_info + crtc_i) < 0)
+      goto cg_fail;
+  
+  if (libcoopgamma_set_nonblocking(&cg, 1) < 0)
+    goto fail;
+  
+  asyncs = alloca(filters_n * sizeof(*asyncs));
+  memset(asyncs, 0, filters_n * sizeof(*asyncs));
+  for (filter_i = 0; filter_i < filters_n; filter_i++)
+    if (libcoopgamma_async_context_initialise(asyncs + filter_i) < 0)
+      goto fail;
+  
+  switch (get_crtc_info())
+    {
+    case 0:
+      break;
+    case -1:
+      goto fail;
+    case -2:
+      goto cg_fail;
+    }
+  
+  for (crtc_i = 0; crtc_i < crtcs_n; crtc_i++)
+    {
+      if (explicit_crtcs && !(crtc_info[crtc_i].supported))
+	fprintf(stderr, "%s: warning: gamma adjustments not supported on CRTC: %s\n",
+		argv0, crtcs[crtc_i]);
+      if (crtc_info[crtc_i].cooperative == 0)
+	fprintf(stderr, "%s: warning: cooperative gamma server not running for CRTC: %s\n",
+		argv0, crtcs[crtc_i]);
+    }
+  
+  crtc_updates = alloca(filters_n * sizeof(*crtc_updates));
+  memset(crtc_updates, 0, filters_n * sizeof(*crtc_updates));
+  for (filter_i = i = 0; i < classes_n; i++)
+    for (crtc_i = 0; crtc_i < crtcs_n; crtc_i++, filter_i++)
+      {
+	if (libcoopgamma_filter_initialise(&(crtc_updates[filter_i].filter)) < 0)
+	  goto fail;
+	if (libcoopgamma_error_initialise(&(crtc_updates[filter_i].error)) < 0)
+	  goto fail;
+	crtc_updates[filter_i].crtc = crtc_i;
+	crtc_updates[filter_i].synced = 1;
+	crtc_updates[filter_i].failed = 0;
+	crtc_updates[filter_i].master = 1;
+	crtc_updates[filter_i].slaves = NULL;
+	crtc_updates[filter_i].filter.crtc                = crtcs[crtc_i];
+	crtc_updates[filter_i].filter.class               = classes[i];
+	crtc_updates[filter_i].filter.priority            = priority;
+	crtc_updates[filter_i].filter.depth               = crtc_info[crtc_i].depth;
+	crtc_updates[filter_i].filter.ramps.u8.red_size   = crtc_info[crtc_i].red_size;
+	crtc_updates[filter_i].filter.ramps.u8.green_size = crtc_info[crtc_i].green_size;
+	crtc_updates[filter_i].filter.ramps.u8.blue_size  = crtc_info[crtc_i].blue_size;
+	switch (crtc_updates[filter_i].filter.depth)
+	  {
+#define X(CONST, MEMBER, MAX, TYPE)\
+	    case CONST:\
+	      libcoopgamma_ramps_initialise(&(crtc_updates[filter_i].filter.ramps.MEMBER));\
+	      libclut_start_over(&(crtc_updates[filter_i].filter.ramps.MEMBER), MAX, TYPE, 1, 1, 1);\
+	      break;
+LIST_DEPTHS
+#undef X
+	  default:
+	    fprintf(stderr, "%s: internal error: gamma ramp type is unrecognised: %i\n",
+		    argv0, crtc_updates[filter_i].filter.depth);
+	    goto custom_fail;
+	  }
+      }
+  
+  switch (start())
+    {
+    case 0:
+      break;
+    case -1:
+      goto fail;
+    case -2:
+      goto cg_fail;
+    case -3:
+      goto custom_fail;
+    }
+  
+  for (filter_i = 0; filter_i < filters_n; filter_i++)
+    if (crtc_updates[filter_i].failed)
+      {
+	const char* side = cg.error.server_side ? "server" : "client";
+	const char* crtc = crtc_updates[filter_i].filter.crtc;
+	if (cg.error.custom)
+	  {
+	    if ((cg.error.number != 0) && (cg.error.description != NULL))
+	      fprintf(stderr, "%s: %s-side error number %" PRIu64 " for CRTC %s: %s\n",
+		      argv0, side, cg.error.number, crtc, cg.error.description);
+	    else if (cg.error.number != 0)
+	      fprintf(stderr, "%s: %s-side error number %" PRIu64 " for CRTC %s\n",
+		      argv0, side, cg.error.number, crtc);
+	    else if (cg.error.description != NULL)
+	      fprintf(stderr, "%s: %s-side error for CRTC %s: %s\n", argv0, side, crtc, cg.error.description);
+	  }
+	else if (cg.error.description != NULL)
+	  fprintf(stderr, "%s: %s-side error for CRTC %s: %s\n", argv0, side, crtc, cg.error.description);
+	else
+	  fprintf(stderr, "%s: %s-side error for CRTC %s: %s\n", argv0, side, crtc, strerror(cg.error.number));
+      }
+  
+ done:
+  if (dealloc_crtcs)
+    free(crtcs);
+  if (crtc_info != NULL)
+    for (crtc_i = 0; crtc_i < crtcs_n; crtc_i++)
+      libcoopgamma_crtc_info_destroy(crtc_info + crtc_i);
+  if (asyncs != NULL)
+    for (filter_i = 0; filter_i < filters_n; filter_i++)
+      libcoopgamma_async_context_destroy(asyncs + filter_i);
+  if (stage >= 1)
+    libcoopgamma_context_destroy(&cg, stage >= 2);
+  if (crtc_updates != NULL)
+    for (filter_i = 0; filter_i < filters_n; filter_i++)
+      {
+	if (crtc_updates[filter_i].master == 0)
+	  memset(&(crtc_updates[filter_i].filter.ramps.u8), 0, sizeof(crtc_updates[filter_i].filter.ramps.u8));
+	crtc_updates[filter_i].filter.crtc = NULL;
+	crtc_updates[filter_i].filter.class = NULL;
+	libcoopgamma_filter_destroy(&(crtc_updates[filter_i].filter));
+	libcoopgamma_error_destroy(&(crtc_updates[filter_i].error));
+	free(crtc_updates[filter_i].slaves);
+      }
+  return rc;
+  
+ custom_fail:
+  rc = 1;
+  goto done;
+  
+ fail:
+  rc = 1;
+  if (errno)
+    perror(argv0);
+  goto done;
+  
+ cg_fail:
+  rc = 1;
+  {
+    const char* side = cg.error.server_side ? "server" : "client";
+    if (cg.error.custom)
+      {
+	if ((cg.error.number != 0) && (cg.error.description != NULL))
+	  fprintf(stderr, "%s: %s-side error number %" PRIu64 ": %s\n",
+		  argv0, side, cg.error.number, cg.error.description);
+	else if (cg.error.number != 0)
+	  fprintf(stderr, "%s: %s-side error number %" PRIu64 "\n", argv0, side, cg.error.number);
+	else if (cg.error.description != NULL)
+	  fprintf(stderr, "%s: %s-side error: %s\n", argv0, side, cg.error.description);
+      }
+    else if (cg.error.description != NULL)
+      fprintf(stderr, "%s: %s-side error: %s\n", argv0, side, cg.error.description);
+    else
+      fprintf(stderr, "%s: %s-side error: %s\n", argv0, side, strerror(cg.error.number));
+  }
+  goto done;
+}
+
diff --git a/cg-base.h b/cg-base.h
new file mode 100644
index 0000000..cd885e7
--- /dev/null
+++ b/cg-base.h
@@ -0,0 +1,254 @@
+/**
+ * cg-tools -- Cooperative gamma-enabled tools
+ * Copyright (C) 2016  Mattias Andrée (maandree@kth.se)
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <libcoopgamma.h>
+
+#include <inttypes.h>
+
+
+
+/**
+ * Value of `default_priority` that indicates
+ * that there is no default priority
+ */
+#define NO_DEFAULT_PRIORITY  INT64_MAX
+
+
+
+/**
+ * X-macro that list all gamma ramp types
+ * 
+ * X will be expanded with 4 arguments:
+ * 1)  The libcoopgamma constant that identifies the type
+ * 2)  The member in `union libcoopgamma_ramps` that
+ *     corresponds to the type
+ * 3)  The max value for the ramp stops
+ * 4)  The type of the ramp stops
+ */
+#define LIST_DEPTHS\
+  X(LIBCOOPGAMMA_UINT8,  u8,  UINT8_MAX,   uint8_t)\
+  X(LIBCOOPGAMMA_UINT16, u16, UINT16_MAX,  uint16_t)\
+  X(LIBCOOPGAMMA_UINT32, u32, UINT32_MAX,  uint32_t)\
+  X(LIBCOOPGAMMA_UINT64, u64, UINT64_MAX,  uint64_t)\
+  X(LIBCOOPGAMMA_FLOAT,  f,   ((float)1),  float)\
+  X(LIBCOOPGAMMA_DOUBLE, d,   ((double)1), double)
+
+
+
+/**
+ * Information (except asynchronous call context)
+ * required to update the gamma ramps on a CRTC.
+ */
+typedef struct filter_update
+{
+  /**
+   * The filter to update
+   * 
+   * `.filter.crtc`, `.filter.class`, and
+   * `.filter.priority` (unless `default_priority`
+   * is `NO_DEFAULT_PRIORITY`), `.filter.depth`
+   * are preconfigured, and `.filter.ramps`
+   * is preinitialised and preset to an
+   * identity ramp
+   */
+  libcoopgamma_filter_t filter;
+  
+  /**
+   * The index of the CRTC
+   */
+  size_t crtc;
+  
+  /**
+   * Has the update been synchronised?
+   */
+  int synced;
+  
+  /**
+   * Did the update fail?
+   */
+  int failed;
+  
+  /**
+   * Error description if `.failed` is true
+   */
+  libcoopgamma_error_t error;
+  
+  /**
+   * If zero, the ramps in `.filter` shall
+   * neither be modified nor freed
+   */
+  int master;
+  
+  /**
+   * 0-terminated list of elements in
+   * `.crtc_updates` which shares gamma
+   * ramps with this instance
+   * 
+   * This will only be set if `.master`
+   * is true
+   */
+  size_t* slaves;
+  
+} filter_update_t;
+
+
+
+/**
+ * The process's name
+ */
+extern const char* argv0;
+
+/**
+ * The libcoopgamma context
+ */
+extern libcoopgamma_context_t cg;
+
+/**
+ * The names of the selected CRTC:s
+ */
+extern char** crtcs;
+
+/**
+ * Gamma ramp updates for each CRTC
+ */
+extern filter_update_t* crtc_updates;
+
+/**
+ * CRTC and monitor information about
+ * each selected CRTC and connect monitor
+ */
+extern libcoopgamma_crtc_info_t* crtc_info;
+
+/**
+ * The number of selected CRTC:s
+ */
+extern size_t crtcs_n;
+
+/**
+ * The number of filters
+ */
+extern size_t filters_n;
+
+
+
+/**
+ * The default filter priority for the program
+ */
+extern const int64_t default_priority;
+
+/**
+ * The default class for the program
+ */
+extern char default_class[];
+
+/**
+ * Class suffixes
+ */
+extern const char* const* class_suffixes;
+
+
+
+/**
+ * Make elements in `crtc_updates` slaves where appropriate
+ * 
+ * @return  Zero on success, -1 on error
+ */
+int make_slaves(void);
+
+/**
+ * Update a filter and synchronise calls
+ * 
+ * @param   index    The index of the CRTC
+ * @param   timeout  The number of milliseconds a call to `poll` may block,
+ *                   -1 if it may block forever
+ * @return           1: Success, no pending synchronisations
+ *                   0: Success, with still pending synchronisations
+ *                   -1: Error, `errno` set
+ *                   -2: Error, `cg.error` set
+ * 
+ * @throws  EINTR   Call to `poll` was interrupted by a signal
+ * @throws  EAGAIN  Call to `poll` timed out
+ */
+int update_filter(size_t index, int timeout);
+
+/**
+ * Synchronised calls
+ * 
+ * @param   timeout  The number of milliseconds a call to `poll` may block,
+ *                   -1 if it may block forever
+ * @return           1: Success, no pending synchronisations
+ *                   0: Success, with still pending synchronisations
+ *                   -1: Error, `errno` set
+ *                   -2: Error, `cg.error` set
+ * 
+ * @throws  EINTR   Call to `poll` was interrupted by a signal
+ * @throws  EAGAIN  Call to `poll` timed out
+ */
+int synchronise(int timeout);
+
+
+/**
+ * Print usage information and exit
+ */
+#if defined(__GNUC__)
+__attribute__((__noreturn__))
+#endif
+extern void usage(void);
+
+/**
+ * Handle a command line option
+ * 
+ * @param   opt  The option, it is a NUL-terminate two-character
+ *               string starting with either '-' or '+', if the
+ *               argument is not recognised, call `usage`. This
+ *               string will not be "-M", "-S", "-c", "-p", or "-R".
+ * @param   arg  The argument associated with `opt`,
+ *               `NULL` there is no next argument, if this
+ *               parameter is `NULL` but needed, call `usage`
+ * @return       0 if `arg` was not used,
+ *               1 if `arg` was used,
+ *               -1 on error
+ */
+#if defined(__GNUC__)
+__attribute__((__nonnull__(1)))
+#endif
+extern int handle_opt(char* opt, char* arg);
+
+/**
+ * This function is called after the last
+ * call to `handle_opt`
+ * 
+ * @param   argc  The number of unparsed arguments
+ * @param   argv  `NULL` terminated list of unparsed arguments
+ * @param   prio  The argument associated with the "-p" option
+ * @return        Zero on success, -1 on error
+ */
+#if defined(__GNUC__)
+__attribute__((__nonnull__(2)))
+#endif
+extern int handle_args(int argc, char* argv[], char* prio);
+
+/**
+ * The main function for the program-specific code
+ * 
+ * @return  0: Success
+ *          -1: Error, `errno` set
+ *          -2: Error, `cg.error` set
+ *          -3: Error, message already printed
+ */
+extern int start(void);
+
diff --git a/config.mk b/config.mk
new file mode 100644
index 0000000..66d6676
--- /dev/null
+++ b/config.mk
@@ -0,0 +1,6 @@
+PREFIX = /usr
+MANPREFIX = $(PREFIX)/share/man
+
+CPPFLAGS = -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_XOPEN_SOURCE=700 -D_GNU_SOURCE
+CFLAGS   = -std=c99 -Wall -g
+LDFLAGS  = -lcoopgamma -lred -lm
diff --git a/extra/restart-radharc b/extra/restart-radharc
deleted file mode 100755
index 96af888..0000000
--- a/extra/restart-radharc
+++ /dev/null
@@ -1,59 +0,0 @@
-#!/bin/sh
-
-# Copyright © 2016  Mattias Andrée <maandree@member.fsf.org>
-# 
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-# 
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-# 
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-# DEPENDENCIES: findutils, coreutils, sed, util-linux, linux, sh
-
-# Frequent international traveller? Set up cron to run this every
-# now and then. It will restart all your instances of radharc, and
-# if you have a custom script in $PATH named radharc (as your should
-# have) that figures out your location and starts radharc, radharc
-# will br aware of your no location.
-
-
-# Close all file descriptors (except stderr,) so that radharc does not inherity any.
-for fd in $(ls -1 /dev/fd/); do
-    if [ ! "$fd" = 2 ]; then
-	eval "exec ${fd}<&-";
-    fi
-done
-
-# Get the user's real UID, in a sh-portable way.
-uid="$(cat /proc/self/status | grep '^Uid:' | cut -f 2)"
-
-# Restart all instances of radharc.
-for pid in pgrep -x -U $uid radharc; do
-    # Open environ and cmdline and be sure that they we successfully opened.
-    # It is possible that the process has exited.
-    exec 3<proc/"$pid"/environ 2>/dev/null
-    if [ ! $? = 0 ]; then
-	continue
-    fi
-    exec 4<proc/"$pid"/cmdline 2>/dev/null
-    if [ ! $? = 0 ]; then
-	continue
-    fi
-    
-    # Restart radharc
-    (<&3 cat
-     printf 'radharc\x00'
-     <&4 xargs -0 printf '%s\n' | sed 1d | grep -v '^-n$' | xargs printf '%s\x00'
-     printf '%s\x00' '-n'
-     exec 3<&-
-     exec 4<&-
-    ) | (kill -KILL "$pid" ; exec xargs -0 setsid env -i -- <>/dev/null 2>/dev/null &)
-done
-
diff --git a/radharc.c b/radharc.c
new file mode 100644
index 0000000..023afab
--- /dev/null
+++ b/radharc.c
@@ -0,0 +1,402 @@
+/* See LICENSE file for copyright and license details. */
+#include "cg-base.h"
+
+#include <sys/timerfd.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <libclut.h>
+#include <libred.h>
+
+/**
+ * The default filter priority for the program
+ */
+const int64_t default_priority = (int64_t)7 << 61;
+
+/**
+ * The default class for the program
+ */
+char default_class[] = "radharc::radharc::standard";
+
+/**
+ * Class suffixes
+ */
+const char *const *class_suffixes = (const char *const[]){NULL};
+
+/**
+ * The effect fade-in time, in centiseconds
+ */
+static unsigned long int fade_in_cs = 0;
+
+/**
+ * The effect fade-out time, in centiseconds
+ */
+static unsigned long int fade_out_cs = 0;
+
+/**
+ * The highest elevation of the Sun where the lowest
+ * colour temperature is applied
+ */
+static double low_elev = -6;
+
+/**
+ * The lowest colour temperature that may be applied
+ */
+static double low_temp = 2500;
+
+/**
+ * The lowest elevation of the Sun where the highest
+ * colour temperature is applied
+ */
+static double high_elev = 3;
+
+/**
+ * The highest colour temperature that may be applied
+ */
+static double high_temp = 5000;
+
+/**
+ * The temperature choosen with the -f flag, negative if none
+ */
+static double choosen_temperature = -1;
+
+/**
+ * The latitude coordiate of the GPS coordiates of
+ * the user's location
+ */
+static double latitude;
+
+/**
+ * The longitude coordiate of the GPS coordiates of
+ * the user's location
+ */
+static double longitude;
+
+/**
+ * Whether the user's location has been specified
+ */
+static int have_location = 0;
+
+/**
+ * Whether the -d flag (keep process running and remove
+ * effect when killed) has been specified
+ */
+static int dflag = 0;
+
+/**
+ * Whether the -x flag (remove applied effect)
+ * has been specified
+ */
+static int xflag = 0;
+
+/**
+ * Print usage information and exit
+ */
+void
+usage(void)
+{
+	fprintf(stderr,
+	        "usage: %s [-M method] [-S site] [-c crtc]... [-R rule] [-p priority]"
+	        " [-f fade-in] [-F fade-out] [-h [high-temp][@high-elev]] [-l [low-temp][@low-elev]]"
+	        " (-L latitude:longitude | -t temperature [-d] | -x)\n", argv0);
+	exit(1);
+}
+
+/**
+ * Parse a non-negative double encoded as a string
+ * 
+ * @param   out  Output parameter for the value
+ * @param   str  The string
+ * @return       Zero on success, -1 if the string is invalid
+ */
+static int
+parse_double(double *out, const char *str)
+{
+	char *end;
+	errno = 0;
+	*out = strtod(str, &end);
+	if (errno || *out < 0 || isinf(*out) || isnan(*out) || *end)
+		return -1;
+	if (!*str || !strchr("0123456789.", *str))
+		return -1;
+	return 0;
+}
+
+/**
+ * Handle a command line option
+ * 
+ * @param   opt  The option, it is a NUL-terminate two-character
+ *               string starting with either '-' or '+', if the
+ *               argument is not recognised, call `usage`. This
+ *               string will not be "-M", "-S", "-c", "-p", or "-R".
+ * @param   arg  The argument associated with `opt`,
+ *               `NULL` there is no next argument, if this
+ *               parameter is `NULL` but needed, call `usage`
+ * @return       0 if `arg` was not used,
+ *               1 if `arg` was used,
+ *               -1 on error
+ */
+int
+handle_opt(char *opt, char *arg)
+{
+	double t;
+	char *p;
+	if (opt[0] == '-') {
+		switch (opt[1]) {
+		case 'd':
+			dflag = 1;
+			xflag = 0;
+			break;
+		case 'f':
+			if (parse_double(&t, arg))
+				usage();
+			fade_in_cs = (unsigned long int)(t * 100 + 0.5);
+			return 1;
+		case 'F':
+			if (parse_double(&t, arg))
+				usage();
+			fade_out_cs = (unsigned long int)(t * 100 + 0.5);
+			return 1;
+		case 'h':
+			p = strchr(arg, '@');
+			if (p)
+				*p++ = '\0';
+			if (*arg && parse_double(&high_temp, arg))
+				usage();
+			if (*p && parse_double(&high_elev, p))
+				usage();
+			return 1;
+		case 'l':
+			p = strchr(arg, '@');
+			if (p)
+				*p++ = '\0';
+			if (*arg && parse_double(&low_temp, arg))
+				usage();
+			if (*p && parse_double(&low_elev, p))
+				usage();
+			return 1;
+		case 'L':
+			p = strchr(arg, ':');
+			if (!p)
+				usage();
+			*p++ = '\0';
+			if (parse_double(&latitude, arg) || latitude < -90 || latitude > 90)
+				usage();
+			if (parse_double(&longitude, p) || longitude < -180 || longitude > 180)
+				usage();
+			choosen_temperature = -1;
+			have_location = 1;
+			dflag = 0;
+			xflag = 0;
+			return 1;
+		case 't':
+			if (parse_double(&choosen_temperature, arg))
+				usage();
+			xflag = 0;
+			return 1;
+		case 'x':
+			xflag = 1;
+			dflag = 0;
+			break;
+		default:
+			usage();
+		}
+	} else {
+		usage();
+	}
+	return 0;
+}
+
+/**
+ * This function is called after the last
+ * call to `handle_opt`
+ * 
+ * @param   argc  The number of unparsed arguments
+ * @param   argv  `NULL` terminated list of unparsed arguments
+ * @param   prio  The argument associated with the "-p" option
+ * @return        Zero on success, -1 on error
+ */
+int
+handle_args(int argc, char *argv[], char *prio)
+{
+	if (argc || (!xflag && !have_location && choosen_temperature < 0))
+		usage();
+	return 0;
+	(void) argv;
+	(void) prio;
+}
+
+/**
+ * Fill a filter
+ * 
+ * @param  filter  The filter to fill
+ * @param  red     The red brightness
+ * @param  green   The green brightness
+ * @param  blue    The blue brightness
+ */
+static void
+fill_filter(libcoopgamma_filter_t *restrict filter, double red, double green, double blue)
+{
+	switch (filter->depth) {
+#define X(CONST, MEMBER, MAX, TYPE)\
+	case CONST:\
+		libclut_start_over(&(filter->ramps.MEMBER), MAX, TYPE, 1, 1, 1);\
+		libclut_rgb_brightness(&(filter->ramps.MEMBER), MAX, TYPE, red, green, blue);\
+		break;
+LIST_DEPTHS
+#undef X
+	default:
+		abort();
+	}
+}
+
+/**
+ * Set the gamma ramps
+ * 
+ * @param   red    The red brightness
+ * @param   green  The green brightness
+ * @param   blue   The blue brightness
+ * @return         0: Success
+ *                 -1: Error, `errno` set
+ *                 -2: Error, `cg.error` set
+ *                 -3: Error, message already printed
+ */
+static int
+set_ramps(double red, double green, double blue)
+{
+	int r;
+	size_t i, j;
+
+	for (i = 0, r = 1; i < filters_n; i++) {
+		if (!(crtc_updates[i].master) || !(crtc_info[crtc_updates[i].crtc].supported))
+			continue;
+		fill_filter(&(crtc_updates[i].filter), red, green, blue);
+		r = update_filter(i, 0);
+		if (r == -2 || (r == -1 && errno != EAGAIN))
+			return r;
+		if (crtc_updates[i].slaves) {
+			for (j = 0; crtc_updates[i].slaves[j] != 0; j++) {
+				r = update_filter(crtc_updates[i].slaves[j], 0);
+				if (r == -2 || (r == -1 && errno != EAGAIN))
+					return r;
+			}
+		}
+	}
+
+	while (r != 1)
+		if ((r = synchronise(-1)) < 0)
+			return r;
+
+	return 0;
+}
+
+/**
+ * Get the colour temperature for the current time
+ * 
+ * @param   tp  Output parameter for the colour temperature
+ * @return      0 on success, -1 on failure
+ */
+static int
+get_temperature(double *tp)
+{
+	if (choosen_temperature < 0) {
+		if (libred_solar_elevation(latitude, longitude, tp))
+			return -1;
+		printf("elevation: %g\n", *tp);
+		if (*tp < low_elev)
+			*tp = low_elev;
+		if (*tp > high_elev)
+			*tp = high_elev;
+		*tp = (*tp - low_elev) / (high_elev - low_elev);
+		*tp = low_temp + *tp * (high_temp - low_temp);
+		printf("temperature: %g\n", *tp);
+	} else {
+		*tp = choosen_temperature;
+	}
+	return 0;
+}
+
+
+/**
+ * The main function for the program-specific code
+ * 
+ * @return  0: Success
+ *          -1: Error, `errno` set
+ *          -2: Error, `cg.error` set
+ *          -3: Error, message already printed
+ */
+int
+start(void)
+{
+	int r, tfd;
+	size_t i;
+	double temperature, red, green, blue;
+	uint64_t overrun;
+
+	if (xflag)
+		for (i = 0; i < filters_n; i++)
+			crtc_updates[i].filter.lifespan = LIBCOOPGAMMA_REMOVE;
+	else if (choosen_temperature >= 0 && !dflag)
+		for (i = 0; i < filters_n; i++)
+			crtc_updates[i].filter.lifespan = LIBCOOPGAMMA_UNTIL_REMOVAL;
+	else
+		for (i = 0; i < filters_n; i++)
+			crtc_updates[i].filter.lifespan = LIBCOOPGAMMA_UNTIL_DEATH;
+
+	if (!xflag) {
+		if (libred_check_timetravel())
+			return -1;
+		if (choosen_temperature < 0)
+			dflag = 1;
+	}
+
+	if (xflag)
+		return set_ramps(1, 1, 1);
+
+	if ((r = make_slaves()) < 0)
+		return r;
+
+	if (!fade_in_cs)
+		goto no_fade_in;
+
+	tfd = timerfd_create(CLOCK_MONOTONIC, 0);
+	if (tfd < 0)
+		return -1;
+	if (timerfd_settime(tfd, 0, &(struct itimerspec){{0, 10000000L}, {0, 10000000L}}, NULL))
+		return -1;
+
+	for (i = 0; i < (size_t)fade_in_cs;) {
+		if (i % 600 == 0)
+			if ((r = get_temperature(&temperature)) < 0)
+				return r;
+		if (libred_get_colour((long int)(6500 - (6500 - temperature) * i / fade_in_cs), &red, &green, &blue))
+			return -1;
+		if ((r = set_ramps(red, green, blue)) < 0)
+			return r;
+
+		if (read(tfd, &overrun, sizeof(overrun)) != sizeof(overrun))
+			return -1;
+		if (overrun > fade_in_cs - i)
+			overrun = fade_in_cs - i;
+		i += overrun;
+	}
+
+	close(tfd);
+
+no_fade_in:
+	for (;;) {
+		if ((r = get_temperature(&temperature)) < 0)
+			return r;
+		if (libred_get_colour((long int)temperature, &red, &green, &blue))
+			return -1;
+		if ((r = set_ramps(red, green, blue)) < 0)
+			return r;
+
+		if (!dflag)
+			return 0;
+
+		sleep(6);
+	}
+}
diff --git a/src/arg.h b/src/arg.h
deleted file mode 100644
index 77a519d..0000000
--- a/src/arg.h
+++ /dev/null
@@ -1,78 +0,0 @@
-/**
- * Copyright © 2016  Mattias Andrée <maandree@member.fsf.org>
- * 
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- * 
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- * 
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-
-
-
-/**
- * The name of the process.
- */
-extern char *argv0;
-
-
-
-/**
- * Start command line parsing.
- * 
- * `argv` and `argc` must be available as given to `main`.
- * The global variable `argv0` must be declare (not necessary
- * the the same file) and will be set to `argv[0]`.
- * 
- * Only short options and "--" are supported. Short options
- * may start with a '+', in which case `plus` will be 1.
- * 
- * @example
- *     ARGBEGIN {
- *     case 'a':  printf("%s\n", plus ? "+a" : "-a");                        break;
- *     case 'b':  if (plus) usage(1); printf("-b\n");                        break;
- *     case 'c':  if (plus) printf("+c\n"); else printf("-c %s\n", ARGF());  break;
- *     default:   usage(1);                                                  break;
- *     } ARGEND;
- */
-#define ARGBEGIN  \
-do {  \
-	for (argv0 = *argv++, argc -= !!argv0; *argv; argv++, argc--) {  \
-		int plus = argv[0][0] == '+', next__ = 0;  \
-		if (((argv[0][0] != '-') && !plus) || (argv[0][1] == (plus ? '+' : '-'))) {  \
-			if ((argv[0][0] == argv[0][1]) && (argv[0][1] == '-')  && (argv[0][2] == '\0'))  \
-				argc--, argv++;  \
-			break;  \
-		}  \
-		for (argv[0]++; argv[0][0] && !next__;) {  \
-			switch (*(argv[0])++)
-
-/**
- * End of command line parsing,
- */
-#define ARGEND  \
-		}  \
-	}  \
-} while (0)
-
-/**
- * Get the argument of the current option.
- * Do not use more once per option.
- * 
- * The function `noreturn void usage(int)` must be available.
- * `usage` shall exit if its argument is `1`.
- * 
- * @return  The argument of the current option.
- */
-#define ARGF()  \
-	(next__ = 1, argv[0][0] ? (argv[0])  \
-	 : (argv++, (argv[0]    ? (argc--, argv[0])  \
-	                        : (usage(1), NULL))))
-
diff --git a/src/macros.h b/src/macros.h
deleted file mode 100644
index 298a41a..0000000
--- a/src/macros.h
+++ /dev/null
@@ -1,57 +0,0 @@
-/**
- * Copyright © 2016  Mattias Andrée <maandree@member.fsf.org>
- * 
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- * 
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- * 
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-#include <string.h>
-#include <stdio.h>
-#include <unistd.h>
-#include <stdlib.h>
-
-
-
-#define try(...)      do { if (!(__VA_ARGS__)) goto fail; } while (0)
-#define t(...)        do { if   (__VA_ARGS__)  goto fail; } while (0)
-#define CLEANUP(...)  do { int cleanup__ = errno; __VA_ARGS__; errno = cleanup__; } while (0)
-
-#define xstrdup(outp, ...)  \
-do {  \
-	const char *xstrdup__ = (__VA_ARGS__);  \
-	if (xstrdup__)  \
-		try (*(outp) = strdup(xstrdup__));  \
-	else  \
-		*(outp) = NULL;  \
-} while (0)
-
-#define xpread(fd, buf, len, off)   t  (pread(fd, buf, len, off) < (ssize_t)(len))
-#define xpwrite(fd, buf, len, off)  t (pwrite(fd, buf, len, off) < (ssize_t)(len))
-#define xread(fd, buf, len)         t   (read(fd, buf, len)      < (ssize_t)(len))
-#define xwrite(fd, buf, len)        t  (write(fd, buf, len)      < (ssize_t)(len))
-
-#define xcalloc(outp, num)   try (*(outp) = calloc(num, sizeof(**(outp))))
-#define xmalloc(outp, num)   try (*(outp) = malloc((num) * sizeof(**(outp))))
-#define xrealloc(outp, num)  \
-do {  \
-	size_t n__ = (num);  \
-	void *new__ = realloc(*(outp), n__ * sizeof(**(outp)));  \
-	t (n__ && !new__);  \
-	*(outp) = new__;  \
-} while (0)
-
-#define SHRINK(outp, num)  \
-do {  \
-	void *new__ = realloc(*(outp), (num) * sizeof(**(outp)));  \
-	if (new__)  *(outp) = new__;  \
-} while (0)
-
diff --git a/src/radharc.c b/src/radharc.c
deleted file mode 100644
index a0b1344..0000000
--- a/src/radharc.c
+++ /dev/null
@@ -1,50 +0,0 @@
-/**
- * Copyright © 2016  Mattias Andrée <maandree@member.fsf.org>
- * 
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- * 
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- * 
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-#include "state.h"
-#include "macros.h"
-
-#include <libred.h>
-#include <libhaiku.h>
-
-
-
-/**
- * The name of the process.
- */
-char *argv0 = "radharc";
-
-
-
-int
-main(int argc, char *argv[])
-{
-	struct settings settings;
-
-	t (libred_check_timetravel());
-	parse_command_line(argc, argv, &settings);
-	argv0 = argv0 ? argv0 : "radharc";
-	t (get_state_pathname(&settings));
-	t (libred_init_colour());
-
-	return 0;
-
-fail:
-	libhaiku_perror(argv0);
-	libred_term_colour();
-	return 1;
-}
-
diff --git a/src/settings.c b/src/settings.c
deleted file mode 100644
index 1c32a2f..0000000
--- a/src/settings.c
+++ /dev/null
@@ -1,294 +0,0 @@
-/**
- * Copyright © 2016  Mattias Andrée <maandree@member.fsf.org>
- * 
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- * 
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- * 
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-#include "settings.h"
-#include "arg.h"
-#include "macros.h"
-#include <ctype.h>
-#include <errno.h>
-#include <math.h>
-#include <limits.h>
-
-#include <libhaiku.h>
-
-
-
-/**
- * Print usage information and exit if a condition is met.
- * 
- * @param  condition  Do no do anything iff this is zero.
- */
-static void
-usage(int condition)
-{
-	if (!condition) return;
-	fprintf(stderr,
-	        "Usage: %s [OPTIONS]...\n"
-	       	"See `man 1 radharc` for more information.\n",
-	        !argv0 ? "radharc" : argv0), exit(2);
-}
-
-
-/**
- * Parse a temperature string.
- * 
- * @param   str        The temperature string.
- * @param   temp       Output parameter for the temperature.
- *                     Overflow is truncated.
- * @param   direction  Unless `NULL`, will be set to +1 if `str`
- *                     starts with a '+', `-1` if `str` starts
- *                     with a '-', 0 otherwise. If `NULL` and
- *                     `str` starts with a '-' or a '+', the
- *                     function will fail.
- * @param   lower      The function shall fail if the evaluated
- *                     temperature is below this.
- * @return             0 on success, -1 on error.
- */
-static int
-parse_temperature(const char *str, long int *temp, int *direction, int lower)
-{
-	char *end;
-	int dir = *str == '-' ? -1 : *str == '+' ? +1 : 0;
-	str += !!dir;
-	t (dir && !direction);
-	if (dir) *direction = dir;
-	t (!isdigit(*str));
-	*temp = (errno = 0, strtol)(str, &end, 10);
-	t ((errno && !((errno == ERANGE) && (*temp == LONG_MAX))) || *end || (*temp < lower));
-	return 0;
-fail:
-	return -1;
-}
-
-
-/**
- * Parse a string as a positively valued `struct timespec`.
- * 
- * @param   str  The string.
- * @param   ts   Output parameter for the value.
- * @return       0 on success, -1 on error. 
- */
-static int
-parse_timespec(const char *str, struct timespec *ts)
-{
-#define DIGIT(var, c)          var += (var) * 10 + ((c) & 15);
-#define ALL_DIGITS(cond, var)  while ((cond) && isdigit(*str))  DIGIT(var, *str++)
-
-	int points = 0;
-	memset(ts, 0, sizeof(*ts));
-
-	/* Parse seconds. */
-	t (!isdigit(*str));
-	ALL_DIGITS(1, ts->tv_sec);
-
-	/* End? */
-	if (!*str)  return 0;
-	t (*str != '.');
-
-	/* Parse nanoseconds.*/
-	ALL_DIGITS(points++ < 9, ts->tv_nsec);
-	if ((points == 9) && isdigit(*str) && (*str++ >= '5') && (++(ts->tv_nsec) == 1000000000L))
-		ts->tv_sec += 1, ts->tv_nsec = 0;
-	while (isdigit(*str))  str++;
-	t (*str);
-
-	/* End! */
-	return 0;
-fail:
-	return -1;
-}
-
-
-/**
- * Parse a latitude or a longitude value.
- * 
- * @param   str    The string.
- * @param   loc    Output parameter for the value.
- * @param   limit  The limit of the absolute value.
- * @return         0 on success, -1 on error.
- */
-static int
-parse_location(char *str, double *loc, double limit)
-{
-	char* end;
-	if (strstr(str, "−") == str) /* Support proper minus. */
-		*(str += strlen("−") - 1) = '-';
-	if ((*str != '-') && (*str != '+') && (*str != '.') && !isdigit(*str))
-		return -1;
-	*loc = (errno = 0, strtod)(str, &end);
-	return -(errno || *loc || (fabs(*loc) > limit));
-}
-
-
-/**
- * Parse the command line.
- * 
- * @param  argc      The number of elements in `argv`.
- * @param  argv      The commnad line arguments including the zeroth elemenet.
- * @param  settings  Output parameter for the settings.
- */
-void
-parse_command_line(int argc, char *argv[], struct settings *s)
-{
-	int location_set = 0;
-	char *p;
-	char *arg;
-	int c = 0;
-
-	memset(s, 0, sizeof(*s));
-	s->natural_temp = 6500;
-	s->day_temp     = 5500;
-	s->night_temp   = 3500;
-	s->trans_speed  = 50;
-
-#define BOOLEAN(var)  var = !plus;  break
-#define PLUS(...)  (plus ? (__VA_ARGS__) : 0)
-	ARGBEGIN {
-	case 'l':
-		PLUS(location_set = 0);
-		usage(!(p = strchr(arg = ARGF(), ':')));
-		*p++ = '\0', location_set = 1;
-		usage(parse_location(arg, &(s->latitude),   90.0));
-		usage(parse_location(p,   &(s->longitude), 180.0));
-		break;
-	case 't':
-		PLUS(s->day_temp = 5500, s->night_temp = 3500);
-		s->temp = s->day_temp = s->night_temp = 0, s->temp_direction = 0;
-		if ((p = strchr(arg = ARGF(), ':'))) {
-			*p++ = '\0';
-			usage(parse_temperature(arg, &(s->day_temp), NULL, 1000));
-			usage(parse_temperature(p, &(s->night_temp), NULL, 1000));
-		} else {
-			usage(parse_temperature(arg, &(s->temp), &(s->temp_direction), 1000));
-		}
-		break;
-	case 'T':
-		PLUS(s->natural_temp = 6500);
-		usage(parse_temperature(ARGF(), &(s->natural_temp), NULL, 1000));
-		break;
-	case 's':
-		PLUS(s->trans_speed = 50);
-		s->trans_speed = 0;
-		usage(parse_timespec(ARGF(), &(s->transition)));
-		break;
-	case 'S':
-		PLUS(s->trans_speed = 0);
-		usage(parse_temperature(ARGF(), &(s->trans_speed), NULL, 1));
-		break;
-	case 'h':
-		s->hookpath = (plus ? NULL : ARGF());
-		break;
-	case 'd': c++; /* Fall though. */
-	case 'e': c++; /* Fall though. */
-	case 'm': c++;
-		PLUS(s->monitors_n = 0, free(s->monitors_id), free(s->monitors_arg));
-		xrealloc(&(s->monitors_id),  s->monitors_n + 1);
-		xrealloc(&(s->monitors_arg), s->monitors_n + 1);
-		s->monitors_id[s->monitors_n] = ARGF();
-		s->monitors_arg[s->monitors_n++] = (c == 3 ? 'm' : c == 2 ? 'e' : 'd'), c = 0;
-		break;
-	case 'p':  BOOLEAN(s->print_status);
-	case 'n':  BOOLEAN(s->panic_start);
-	case 'N':  BOOLEAN(s->panic_else);
-	case 'o':  BOOLEAN(s->set_and_exit);
-	case 'x':  BOOLEAN(s->ignore_calib);
-	case 'i':  BOOLEAN(s->negative);
-	case 'b':  BOOLEAN(s->use_bus);
-	default:   usage(1);  break;
-	} ARGEND;
-	usage(argc);
-
-	if (!location_set && !(s->temp))
-		fprintf(stderr,
-			"%s: The -l option is mandatory, unless single value -t is used. "
-	        	"See `man 1 radharc` for more information.\n",
-		        !argv0 ? "radharc" : argv0), exit(2);
-
-	return;
-fail:
-	libhaiku_perror(argv0 ? argv0 : "radharc");
-	exit(1);
-}
-
-
-/**
- * Marshal settings into a buffer.
- * 
- * @param   buffer    The buffer, `NULL` if you want to know the required size.
- * @param   settings  The settings to marshal.
- * @return            The size of the output.
- */
-size_t
-marshal_settings(char *buffer, const struct settings *settings)
-{
-#define MARSHAL(N, DATUMP)  (n += aux = (N), (buf ? (memcpy(buf, DATUMP, aux), buf += aux, 0) : 0))
-
-	size_t aux, n = 0, i = 0;
-	char *buf = buffer;
-
-	if (buffer)  i = marshal_settings(NULL, settings);
-	MARSHAL(sizeof(i), &i);
-
-	MARSHAL(sizeof(*settings), settings);
-	if (settings->hookpath)      MARSHAL(strlen(settings->hookpath) + 1, settings->hookpath);
-	if (settings->monitors_arg)  MARSHAL(settings->monitors_n, settings->monitors_arg);
-	for (i = 0; i < settings->monitors_n; i++)
-		MARSHAL(strlen(settings->monitors_id[i]) + 1, settings->monitors_id[i]);
-
-	return n;
-}
-
-
-/**
- * Unmarshal settings from a buffer.
- * 
- * @param   buffer    The buffer.
- * @param   settings  Output parameter for the settings, will be allocated.
- * @return            The number of unmarshalled bytes, 0 on error.
- */
-size_t
-unmarshal_settings(char *buffer, struct settings **settings)
-{
-#define UNMARSHAL(N, DATUMP)  (aux = (N), memcpy((DATUMP), buf, aux), buf += aux)
-
-	size_t n, aux, i;
-	struct settings s_, *s = NULL;
-	char *buf = buffer;
-
-	UNMARSHAL(sizeof(n), &n);
-	if (!(s = *settings = malloc(n - sizeof(n))))  return 0;
-	s->monitors_id = NULL, s->monitors_arg = NULL;
-
-	UNMARSHAL(sizeof(s_), &s_);
-	if (s_.monitors_n) {
-		*s = s_;
-		xmalloc(&(s->monitors_id),  s_.monitors_n);
-		xmalloc(&(s->monitors_arg), s_.monitors_n);
-	}
-
-	buf = strchr(s->hookpath = buf, '\0') + 1;
-
-	UNMARSHAL(s_.monitors_n, s->monitors_arg);
-	for (i = 0; i < s_.monitors_n; i++)
-		UNMARSHAL(strlen(buf + 1), s->monitors_id[i]);
-
-	return n;
-
-fail:
-	CLEANUP(free(s->monitors_id), free(s->monitors_arg), free(s), *settings = NULL);
-	return 0;
-}
-
diff --git a/src/settings.h b/src/settings.h
deleted file mode 100644
index 492e4b0..0000000
--- a/src/settings.h
+++ /dev/null
@@ -1,162 +0,0 @@
-/**
- * Copyright © 2016  Mattias Andrée <maandree@member.fsf.org>
- * 
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- * 
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- * 
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-#include <time.h>
-
-
-
-/**
- * Settings from the command line.
- */
-struct settings {
-	/**
-	 * Print current status and exit?
-	 */
-	int print_status : 1;
-
-	/**
-	 * Start without transition?
-	 */
-	int panic_start : 1;
-
-	/**
-	 * Never transition, apart from at start?
-	 */
-	int panic_else : 1;
-
-	/**
-	 * Set temperature, possibly with transition, and exit?
-	 */
-	int set_and_exit : 1;
-
-	/**
-	 * Ignore calibrations?
-	 */
-	int ignore_calib : 1;
-
-	/**
-	 * Apply negative image filter?
-	 */
-	int negative : 1;
-
-	/**
-	 * Broadcast event with bus?
-	 */
-	int use_bus : 1;
-
-	/**
-	 * -1 to decrease temperature,
-	 * +1 to increase temperature,
-	 *  0 to set temperature.
-	 */
-	int temp_direction;
-
-	/**
-	 * The temperature, if use, the program will exit when it is done.
-	 */
-	long int temp;
-
-	/**
-	 * The temperature at full daytime.
-	 */
-	long int day_temp;
-
-	/**
-	 * The temperature at full night.
-	 */
-	long int night_temp;
-
-	/**
-	 * The temperature when disabled.
-	 */
-	long int natural_temp;
-
-	/**
-	 * Pathname to the hook script.
-	 * Do not free this.
-	 */
-	char *hookpath;
-
-	/**
-	 * The number of seconds the transition takes.
-	 */
-	struct timespec transition;
-
-	/**
-	 * The number of kelvins per seconds the
-	 * temperature is adjusted during transition.
-	 */
-	long int trans_speed;
-
-	/**
-	 * The user's latitudinal position.
-	 */
-	double latitude;
-
-	/**
-	 * The user's longitudinal position.
-	 */
-	double longitude;
-
-	/**
-	 * The number of elements in `monitors_id` and in `monitors_arg`.
-	 */
-	size_t monitors_n;
-
-	/**
-	 * Values for -d, -e, and -m, in order.
-	 * Do not free its elements.
-	 */
-	char **monitors_id;
-
-	/**
-	 * The option (the character after the dash)
-	 * the option used in correspnding element
-	 * in `monitors_id`.
-	 */
-	char *monitors_arg;
-};
-
-
-
-/**
- * Parse the command line.
- * 
- * @param  argc  The number of elements in `argv`.
- * @param  argv  The commnad line arguments including the zeroth elemenet.
- * @param  s     Output parameter for the settings.
- */
-void parse_command_line(int argc, char *argv[], struct settings *s);
-
-
-/**
- * Marshal settings into a buffer.
- * 
- * @param   param     The buffer, `NULL` if you want to know the required size.
- * @param   settings  The settings to marshal.
- * @return            The size of the output.
- */
-size_t marshal_settings(char *buffer, const struct settings *settings);
-
-/**
- * Unmarshal settings from a buffer.
- * 
- * @param   buffer    The buffer.
- * @param   settings  Output parameter for the settings, will be allocated.
- * @return            The number of unmarshalled bytes, 0 on error.
- */
-size_t unmarshal_settings(char *buffer, struct settings **settings);
-
diff --git a/src/state.c b/src/state.c
deleted file mode 100644
index e5c2a42..0000000
--- a/src/state.c
+++ /dev/null
@@ -1,352 +0,0 @@
-/**
- * Copyright © 2016  Mattias Andrée <maandree@member.fsf.org>
- * 
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- * 
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- * 
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-#include "state.h"
-#include "macros.h"
-#include <errno.h>
-#include <limits.h>
-#include <stdarg.h>
-
-#include <libred.h>
-#include <libgamma.h>
-
-
-
-/**
- * The name of the process.
- */
-extern char *argv0;
-
-
-
-/**
- * All sites.
- */
-static libgamma_site_state_t *sites = NULL;
-
-/**
- * The number of sites stored in `sites`.
- */
-static size_t sites_n = 0;
-
-/**
- * All partitions.
- */
-static libgamma_partition_state_t *parts = NULL;
-
-/**
- * The number of partitions stored in `parts`.
- */
-static size_t parts_n = 0;
-
-
-
-/**
- * Is it daytime, night, perhaps some kind of twilight?
- * 
- * @param    elevation  The Sun's apparent elevation.
- * @return              The time of the day.
- */
-enum darkness
-get_darkness(double elevation)
-{
-	if (elevation > LIBRED_SOLAR_ELEVATION_SUNSET_SUNRISE)          return DAYTIME;
-	if (elevation > LIBRED_SOLAR_ELEVATION_CIVIL_DUSK_DAWN)         return CIVIL_TWILIGHT;
-	if (elevation > LIBRED_SOLAR_ELEVATION_NAUTICAL_DUSK_DAWN)      return NAUTICAL_TWILIGHT;
-	if (elevation > LIBRED_SOLAR_ELEVATION_ASTRONOMICAL_DUSK_DAWN)  return ASTRONOMICAL_TWILIGHT;
-	return NIGHT;
-}
-
-
-/**
- * Remove the screen number for a display server instance identifier.
- * 
- * @param   s  Display server instance identifier.
- * @return     Set the value to which this pointer points to '.'. Do nothing if it is `NULL`.
- */
-static char *
-strip_screen(char *s)
-{
-#define S(V, CD)  ((V = ((CD)[1] == 'r' ? strrchr : strchr)(V, (CD)[0])))
-	char *p = strchr(s, '=');
-	if ((p++) && (*p != '/') && S(p, ":r") && S(p, ".l"))  *p = '\0';  else  p = NULL;
-	return p;
-#undef S
-}
-
-
-/**
- * `stpmulcpy(o, a, b, c, NULL)` is equivalent to
- * `stpcpy(stpcpy(stpcpy(o, a), b), c)`
- */
-#ifdef __GNUC__
-__attribute__((__sentinel__))
-#endif
-static char *
-stpmulcpy(char *out, ... /*, NULL */)
-{
-	va_list args;
-	char *p = out;
-	const char *s;
-	va_start(args, out);
-	while ((s = va_arg(args, const char *)))  p = stpcpy(p, s);
-	va_end(args);
-	return p;
-}
-
-
-/**
- * Compare two display server environment strings.
- * 
- * @param   a_  One of the string.
- * @param   b_  The other string.
- * @return      -1, 0, or +1.
- */
-static int
-displayenvcmp(const void *a_, const void *b_)
-{
-#ifdef __GNUC__
-# pragma GCC diagnostic push
-# pragma GCC diagnostic ignored "-Wdiscarded-qualifiers"
-#endif
-	char *a = a_;
-	char *b = b_;
-#ifdef __GNUC__
-# pragma GCC diagnostic pop
-#endif
-	char *p = strip_screen(a);
-	char *q = strip_screen(b);
-	int rc;
-
-	rc = strcmp(a, b);
-	if (p)  *p = '.';
-	if (q)  *q = '.';
-	return rc;
-}
-
-
-/**
- * Make an display string safe for a pathname.
- * 
- * @param   str  The string.
- * @return       A safe version of the string, `NULL` on error.
- */
-static char *
-escape_display(const char* str)
-{
-	char *r, *w, *rc = NULL;
-	int s = 0;
-	xmalloc(&rc, 2 * strlen(str) + 1); strcpy(rc, str);
-	for (r = w = strchr(rc, '=') + 1; *r; r++) {
-		if (!s || (*r != '/')) {
-			if (strchr("@=/", *r))  *w++ = '@';
-			*w++ = ((s = (*r == '/')) ? 's' : *r);
-		}
-	}
-	w[s ? -2 : 0] = '\0';
-fail:
-	return rc;
-}
-
-
-/**
- * The string of display servers.
- * 
- * @param   settings  The settings.
- * @return            The string, `NULL` on error.
- */
-static char *
-get_display_string(const struct settings *settings)
-{
-#define DISPLAY(VAR, D)  p = strip_screen(D); try (VAR = escape_display(D)); if (p)  *p = '.', p = NULL
-
-	const char *var, *val;
-	char *r, *p = NULL, *d = NULL, *rc = NULL, **displays;
-	size_t i, n = 0, len = 0;
-	int method;
-
-	xmalloc(&displays, settings->monitors_n);
-	for (i = 0; i < settings->monitors_n; i++)
-		if ((settings->monitors_arg[i] == 'd') && strchr(settings->monitors_id[i], '='))
-			len += 1 + strlen(displays[n++] = settings->monitors_id[i]);
-	if (n)  goto custom;
-	free(displays), displays = NULL;
-
-	if (!libgamma_list_methods(&method, 1, 0)) {
-		fprintf(stderr, "No display was found.\n"
-		                "DRM support missing.\n"
-		                "Can you even see?\n");
-		return errno = 0, NULL;
-	}
-
-	var = libgamma_method_default_site_variable(method);
-	val = libgamma_method_default_site(method);
-	if (!val || !*val)  return strdup("");
-	xmalloc(&d, 3 + strlen(var) + strlen(val));
-	stpmulcpy(d, ".", var, "=", val, NULL);
-	DISPLAY(rc, d);
-	return free(d), rc;
-
-custom:
-	qsort(displays, n, sizeof(*displays), displayenvcmp);
-	xmalloc(&rc, 2 * len + 1);
-	for (r = rc, i = 0; i < n; i++) {
-		DISPLAY(d, displays[i]);
-		r = stpmulcpy(r, ".", d, NULL), free(d), d = NULL;
-	}
-	free(displays);
-	return rc;
-
-fail:
-	if (p)  *p = '.';
-	CLEANUP(free(rc), free(d), free(displays));
-	return NULL;
-}
-
-
-/**
- * Set $RADHARC_STATE.
- * 
- * @param   settings  The settings.
- * @return            0 on success, -1 on error.
- */
-int
-get_state_pathname(const struct settings *settings)
-{
-	const char *dir = getenv("XGD_RUNTIME_DIR");
-	char *display = NULL;
-	char *env = NULL;
-	int rc = -1;
-	try (display = get_display_string(settings));
-	if (!dir || !*dir)  dir = "/run";
-	xmalloc(&env, strlen(dir) + sizeof("/radharc/") + strlen(display));
-	stpmulcpy(env, dir, "/radharc/", display, NULL);
-	rc = setenv("RADHARC_STATE", env, 1);
-fail:
-	CLEANUP(free(env), free(display));
-	return rc;
-}
-
-
-/**
- * Parse a value for the -d option, or select preferred adjustment method.
- * 
- * @param   display  The argument for the -d option. `NULL` for the preferred adjustment method.
- * @return           The adjustment method. -1 if not found.
- */
-static int
-get_clut_method(const char *display)
-{
-#define HAIKU(TEXT)    t ((msg = (TEXT)))
-#define TEST(STR, ID)  if (!strcasecmp(display, STR))  return ID
-
-	const char *env, *msg;
-	int method;
-
-	/* Default? */
-	if (!display) {
-		if (!libgamma_list_methods(&method, 1, 0))
-			HAIKU("No display was found.\n"
-			      "DRM support missing.\n"
-			      "Can you even see?\n");
-		return method;
-	}
-
-	/* Single-sited? */
-	TEST("none", INT_MAX);
-	TEST("drm", LIBGAMMA_METHOD_LINUX_DRM);
-
-	/* Unrecognised single-sited? */
-	if (!strchr(display, '='))
-		HAIKU("Specified display\n"
-		      "cannot be recognised.\n"
-		      "Try something else.\n");
-
-	/* Multi-sited? */
-	for (method = 0; method < LIBGAMMA_METHOD_COUNT; method++) {
-		env = libgamma_method_default_site_variable(method);
-		if (env && (strstr(display, env) == display) && (display[strlen(env)] == '='))
-			return method;
-	}
-
-	/* Unrecognised multi-sited. */
-	HAIKU("Specified display\n"
-	      "cannot be recognised.\n"
-	      "Try to recompile.\n");
-
-fail:
-	fprintf(stderr, "%s", msg);
-	return errno = 0, -1;
-}
-
-
-/**
- * Initialise the CLUT support.
- * 
- * @param   settings  The settings.
- * @return            0 on success, -1 on error.
- */
-int
-initialise_clut(const struct settings *settings)
-{
-#define NONE_METHOD  (method == INT_MAX)
-
-	int method = 0, error = 0;
-	const char *sitename_;
-	char *sitename = NULL;
-	size_t i, j, parts_off = 0;
-	libgamma_site_state_t site;
-
-	xcalloc(&sites, settings->monitors_n + 1);
-
-	for (i = 0; i < settings->monitors_n; i++) {
-		switch (settings->monitors_arg[i]) {
-		case 'd':
-			parts_off = parts_n;
-			t ((method = get_clut_method(sitename_ = settings->monitors_id[i])) < 0);
-			if (NONE_METHOD)  break;
-			sitename_ = strchr(sitename_, '=');
-			xstrdup(&sitename, sitename_ ? sitename_ + 1 : NULL);
-			t ((error = libgamma_site_initialise(sites + sites_n, method, sitename)));
-			sitename = NULL, site = sites[sites_n++];
-			xrealloc(&parts, parts_n + site.partitions_available);
-			for (j = 0; j < site.partitions_available; j++) {
-				t ((error = libgamma_partition_initialise(parts + parts_n, &site, j)));
-				parts_n++;
-			}
-			break;
-
-		case 'm':
-			if (NONE_METHOD)  break;
-			/* TODO -m */
-			break;
-
-		case 'e':
-			if (NONE_METHOD)  break;
-			/* TODO -e */
-			break;
-		}
-	}
-
-	SHRINK(&sites, sites_n + 1);
-
-	return 0;
-fail:
-	if (error)  libgamma_perror(argv0, error), errno = 0;
-	CLEANUP(free(sitename));
-	return -1;
-}
-
diff --git a/src/state.h b/src/state.h
deleted file mode 100644
index f2c6b11..0000000
--- a/src/state.h
+++ /dev/null
@@ -1,74 +0,0 @@
-/**
- * Copyright © 2016  Mattias Andrée <maandree@member.fsf.org>
- * 
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- * 
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- * 
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-#include "settings.h"
-
-
-
-/**
- * The times of the day, by degree of darkness.
- */
-enum darkness {
-	/**
-	 * Not calculated yet.
-	 */
- 	UNKNOWN = -1,
-
-	/**
-	 * Hopefully, it is bright outside.
-	 */
-	DAYTIME = 0,
-
-	/**
-	 * The sky is golden. The golden "hour".
-	 * Also known as BMCT (dawn) or EECT (dusk).
-	 */
-	CIVIL_TWILIGHT = 1,
-
-	/**
-	 * The sky is pink and blue.
-	 */
-	NAUTICAL_TWILIGHT = 2,
-
-	/**
-	 * The sky is medium dark blue.
-	 */
-	ASTRONOMICAL_TWILIGHT = 3,
-
-	/**
-	 * The sky is really dark blue.
-	 */
-	NIGHT = 4
-};
-
-
-
-/**
- * Is it daytime, night, perhaps some kind of twilight?
- * 
- * @param    elevation  The Sun's apparent elevation.
- * @return              The time of the day.
- */
-enum darkness get_darkness(double elevation);
-
-/**
- * Set $RADHARC_STATE.
- * 
- * @param   settings  The settings.
- * @return            0 on success, -1 on error.
- */
-int get_state_pathname(const struct settings *settings);
-