Change license, add man pages, misc2

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

13 files changed, 460 insertions, 920 deletions

diff --git a/.gitignore b/.gitignore
index b788261..a2e3b26 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,14 +1,6 @@
-_/
-bin/
-obj/
-\#*\#
-.*
+*\#
 *~
-!.git*
-*.sw[op]
-*.bak
 *.o
-*.out
 *.su
-*.gch
-
+/getpgrp
+/setpgrp
diff --git a/COPYING b/COPYING
deleted file mode 100644
index b4b0d6e..0000000
--- a/COPYING
+++ /dev/null
@@ -1,16 +0,0 @@
-setpgrep — run a program in a new process group
-Copyright © 2014  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/>.
-
diff --git a/LICENSE b/LICENSE
index 94a9ed0..68d72a5 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,674 +1,15 @@
-                    GNU GENERAL PUBLIC LICENSE
-                       Version 3, 29 June 2007
+ISC License
 
- Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
- Everyone is permitted to copy and distribute verbatim copies
- of this license document, but changing it is not allowed.
+© 2014, 2021 Mattias Andrée <maandree@kth.se>
 
-                            Preamble
+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.
 
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-  The Free Software Foundation may publish revised and/or new versions of
-the GNU General Public License from time to time.  Such new versions will
-be similar in spirit to the present version, but may differ in detail to
-address new problems or concerns.
-
-  Each version is given a distinguishing version number.  If the
-Program specifies that a certain numbered version of the GNU General
-Public License "or any later version" applies to it, you have the
-option of following the terms and conditions either of that numbered
-version or of any later version published by the Free Software
-Foundation.  If the Program does not specify a version number of the
-GNU General Public License, you may choose any version ever published
-by the Free Software Foundation.
-
-  If the Program specifies that a proxy can decide which future
-versions of the GNU General Public License can be used, that proxy's
-public statement of acceptance of a version permanently authorizes you
-to choose that version for the Program.
-
-  Later license versions may give you additional or different
-permissions.  However, no additional obligations are imposed on any
-author or copyright holder as a result of your choosing to follow a
-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>.
+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
index 4127c6d..80adf03 100644
--- a/Makefile
+++ b/Makefile
@@ -1,108 +1,40 @@
-# Copying and distribution of this file, with or without modification,
-# are permitted in any medium without royalty provided the copyright
-# notice and this notice are preserved.  This file is offered as-is,
-# without any warranty.
+.POSIX:
 
+CONFIGFILE = config.mk
+include $(CONFIGFILE)
 
-# The package path prefix, if you want to install to another root, set DESTDIR to that root.
-PREFIX ?= /usr
-# The command path excluding prefix.
-BIN ?= /bin
-# The library path excluding prefix.
-LIB ?= /lib
-# The executable library path excluding prefix.
-LIBEXEC ?= /libexec
-# The resource path excluding prefix.
-DATA ?= /share
-# The command path including prefix.
-BINDIR ?= $(PREFIX)$(BIN)
-# The library path including prefix.
-LIBDIR ?= $(PREFIX)$(LIB)
-# The executable library path including prefix.
-LIBEXECDIR ?= $(PREFIX)$(LIBEXEC)
-# The resource path including prefix.
-DATADIR ?= $(PREFIX)$(DATA)
-# The generic documentation path including prefix.
-DOCDIR ?= $(DATADIR)/doc
-# The info manual documentation path including prefix.
-INFODIR ?= $(DATADIR)/info
-# The license base path including prefix.
-LICENSEDIR ?= $(DATADIR)/licenses
+BIN = getpgrp setpgrp
+OBJ = $(@:=.o)
+MAN = $(@:=.1)
+HDR = arg.h
 
-# The name of the package as it should be installed.
-PKGNAME ?= setpgrp
 
+all: $(BIN)
+$(OBJ): $(@:.o=.c) $(HDR)
 
-# Optimisation level (and debug flags.)
-OPTIMISE = -Og -g
+getpgrp: getpgrp.o
+	$(CC) -o $@ $@.o $(LDFLAGS)
 
-# Enabled Warnings.
-WARN = -Wall -Wextra -pedantic -Wdouble-promotion -Wformat=2 -Winit-self       \
-       -Wmissing-include-dirs -Wtrampolines -Wfloat-equal -Wshadow             \
-       -Wmissing-prototypes -Wmissing-declarations -Wredundant-decls           \
-       -Wnested-externs -Winline -Wno-variadic-macros -Wsign-conversion        \
-       -Wswitch-default -Wconversion -Wsync-nand -Wunsafe-loop-optimizations   \
-       -Wcast-align -Wstrict-overflow -Wdeclaration-after-statement -Wundef    \
-       -Wbad-function-cast -Wcast-qual -Wwrite-strings -Wlogical-op            \
-       -Waggregate-return -Wstrict-prototypes -Wold-style-definition -Wpacked  \
-       -Wvector-operation-performance -Wunsuffixed-float-constants             \
-       -Wsuggest-attribute=const -Wsuggest-attribute=noreturn                  \
-       -Wsuggest-attribute=pure -Wsuggest-attribute=format -Wnormalized=nfkc
+setpgrp: setpgrp.o
+	$(CC) -o $@ $@.o $(LDFLAGS)
 
-# The C standard used in the code.
-STD = gnu99
+.c.o:
+	$(CC) -c -o $@ $< $(CFLAGS) $(CPPFLAGS)
 
-# Options for the C compiler.
-C_FLAGS = $(OPTIMISE) $(WARN) -std=$(STD) $(CPPFLAGS) $(CFLAGS) $(LDFLAGS)  \
-          -ftree-vrp -fstrict-aliasing -fipa-pure-const -fstack-usage       \
-          -fstrict-overflow -funsafe-loop-optimizations -fno-builtin
+install: $(BIN)
+	mkdir -p -- "$(DESTDIR)$(PREFIX)/bin"
+	mkdir -p -- "$(DESTDIR)$(MANPREFIX)/man1"
+	cp -- $(BIN) "$(DESTDIR)$(PREFIX)/bin/"
+	cp -- $(MAN) "$(DESTDIR)$(MANPREFIX)/man1/"
 
-
-
-.PHONY: all
-all: getpgrp setpgrp
-
-.PHONY: getpgrp setpgrp
-getpgrp: bin/getpgrp
-setpgrp: bin/setpgrp
-
-bin/%: src/%.c
-	@mkdir -p bin
-	$(CC) $(C_FLAGS) -o $@ $^
-
-
-.PHONY: install
-install: install-commands install-license
-
-.PHONY: install-commands
-install-commands: install-getpgrp install-setpgrp
-
-.PHONY: install-getpgrp
-install-getpgrp: bin/getpgrp
-	install -dm755 -- "$(DESTDIR)$(BINDIR)"
-	install -m755 $< -- "$(DESTDIR)$(BINDIR)/getpgrp"
-
-.PHONY: install-setpgrp
-install-setpgrp: bin/setpgrp
-	install -dm755 -- "$(DESTDIR)$(BINDIR)"
-	install -m755 $< -- "$(DESTDIR)$(BINDIR)/setpgrp"
-
-.PHONY: install-license
-install-license:
-	install -dm755 -- "$(DESTDIR)$(LICENSEDIR)/$(PKGNAME)"
-	install -m644 COPYING LICENSE -- "$(DESTDIR)$(LICENSEDIR)/$(PKGNAME)"
-
-
-.PHONY: uninstall
 uninstall:
-	-rm -- "$(DESTDIR)$(BINDIR)/getpgrp"
-	-rm -- "$(DESTDIR)$(BINDIR)/setpgrp"
-	-rm -- "$(DESTDIR)$(LICENSEDIR)/$(PKGNAME)/COPYING"
-	-rm -- "$(DESTDIR)$(LICENSEDIR)/$(PKGNAME)/LICENSE"
-	-rmdir -- "$(DESTDIR)$(LICENSEDIR)/$(PKGNAME)"
-
+	-cd -- "$(DESTDIR)$(PREFIX)/bin/" && rm -f -- $(BIN)
+	-cd -- "$(DESTDIR)$(MANPREFIX)/man1/" && rm -f -- $(MAN)
 
-.PHONY: clean
 clean:
-	-rm -r -- bin *.su
+	-rm -rf -- $(BIN) *.o *.su
+
+.SUFFIXES:
+.SUFFIXES: .o .c
 
+.PHONY: all install uninstall clean
diff --git a/README b/README
index 0d71dda..0294eab 100644
--- a/README
+++ b/README
@@ -1,2 +1,21 @@
-Commands providing access to the setpgrp and getpgrp system calls.
+NAME
+	setpgrp - run a process in a new process group
+	getpgrp - get the current process group
 
+SYNOPSIS
+	setpgrp [-e variable] [-pv] command [argument] ...
+
+	getpgrp
+
+DESCRIPTION
+	The setpgrp utility runs a command in a new process
+	group, and optionally exports that process group
+	identifier to a user-specified environment variable
+	and optionally prints that process group identifier
+	to the standard output.
+
+	The getpgrp utility prints the identifier of the
+	current process group to the standard output.
+
+SEE ALSO
+	setpgid(2), getpgrp(2)
diff --git a/arg.h b/arg.h
new file mode 100644
index 0000000..4f7b6c0
--- /dev/null
+++ b/arg.h
@@ -0,0 +1,45 @@
+/*
+ * 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][0] == '-') {\
+					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_)
+
+#define ARGEND				}\
+				} else {\
+					break;\
+				}\
+			}
+
+#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])))
+
+
+#endif
diff --git a/config.mk b/config.mk
new file mode 100644
index 0000000..58c0906
--- /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
+CFLAGS   = -std=c99 -Wall
+LDFLAGS  = 
diff --git a/getpgrp.1 b/getpgrp.1
new file mode 100644
index 0000000..17b0c00
--- /dev/null
+++ b/getpgrp.1
@@ -0,0 +1,89 @@
+.TH GETPGRP 1 getpgrp
+
+.SH NAME
+getpgrp - get the current process group
+
+.SH SYNOPSIS
+.B getpgrp
+
+.SH DESCRIPTION
+The
+.B getpgrp
+utility prints the identifier of the
+current process group to the standard output.
+
+.SH OPTIONS
+The
+.B getpgrp
+utility conforms to the Base Definitions volume of POSIX.1-2017,
+.IR "Section 12.2" ,
+.IR "Utility Syntax Guidelines" .
+.PP
+No options are supported.
+
+.SH OPERANDS
+No operands are supported.
+
+.SH STDIN
+Not used.
+
+.SH INPUT FILES
+None.
+
+.SH ENVIRONMENT VARIABLES
+No environment variables affects the execution of
+.BR getpgrp .
+
+.SH ASYNCHRONOUS EVENTS
+Default.
+
+.SH STDOUT
+The
+.B getpgrp
+utility prints the identifier of it's process group
+to the standard output.
+
+.SH STDERR
+The standard error is used for diagnostic messages.
+
+.SH OUTPUT FILES
+None.
+
+.SH EXTENDED DESCRIPTION
+None.
+
+.SH EXIT STATUS
+If the
+.B getpgrp
+exits with one of the following statuses:
+.TP
+0
+Successful.
+.TP
+1
+A error occurred.
+
+.SH CONSEQUENCES OF ERRORS
+Default.
+
+.SH APPLICATION USAGE
+None.
+
+.SH EXAMPLES
+None.
+
+.SH RATIONALE
+None.
+
+.SH NOTES
+None.
+
+.SH BUGS
+None.
+
+.SH FUTURE DIRECTIONS
+None.
+
+.SH SEE ALSO
+.BR getpgrp (2),
+.BR setpgrp (1)
diff --git a/getpgrp.c b/getpgrp.c
new file mode 100644
index 0000000..f3e9c81
--- /dev/null
+++ b/getpgrp.c
@@ -0,0 +1,34 @@
+/* See LICENSE file for copyright and license details. */
+#include <errno.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "arg.h"
+
+
+char *argv0;
+
+int
+main(int argc, char *argv[])
+{
+	ARGBEGIN {
+	default:
+		goto usage;
+	} ARGEND;
+	if (argc)
+		goto usage;
+
+	printf("%ji\n", (intmax_t)getpgrp());
+	if (fflush(stdout) || ferror(stdout) || fclose(stdout)) {
+		fprintf(stderr, "%s: printf: %s\n", argv0, strerror(errno));
+		return 1;
+	}
+
+	return 0;
+
+usage:
+	fprintf(stderr, "usage: %s\n", argv0);
+	return 1;
+}
diff --git a/setpgrp.1 b/setpgrp.1
new file mode 100644
index 0000000..2deb440
--- /dev/null
+++ b/setpgrp.1
@@ -0,0 +1,142 @@
+.TH SETPGRP 1 setpgrp
+
+.SH NAME
+setpgrp - run a process in a new process group
+
+.SH SYNOPSIS
+.B setpgrp
+[-e
+.IR variable ]
+[-pv]
+.I command
+.RI [ argument ]\ ...
+
+.SH DESCRIPTION
+The
+.B setpgrp
+utility runs a command in a new process
+group, and optionally exports that process group
+identifier to a user-specified environment variable
+and optionally prints that process group identifier
+to the standard output.
+
+.SH OPTIONS
+The
+.B setpgrp
+utility conforms to the Base Definitions volume of POSIX.1-2017,
+.IR "Section 12.2" ,
+.IR "Utility Syntax Guidelines" .
+.PP
+The following option is supported:
+.TP
+.BI -e\  variable
+Export the identifier of the new process group
+to the specified environment
+.IR variable .
+.TP
+.B -p
+Print the identifier of the new process group
+to the standard output.
+.TP
+.B -v
+Print the identifier of the new process group
+to the standard error as a normal diagnostic message.
+
+.SH OPERANDS
+The following operands are supported:
+.TP
+.I command
+The command that shall be run with as the root user.
+This will be both the process image and the process's
+zeroth command line argument.
+.TP
+.IR argument \ ...
+Command line arguments for the command to run.
+
+.SH STDIN
+The
+.B setpgrp
+utility does not use the standard input, however the
+.I command
+it starts may.
+
+.SH INPUT FILES
+None.
+
+.SH ENVIRONMENT VARIABLES
+The following environment variables affects the execution of
+.BR setpgrp :
+.TP
+.SH PATH
+Default. See to the Base Definitions volume of POSIX.1-2017, Section 8.3, Other Environment Variables.
+
+.SH ASYNCHRONOUS EVENTS
+Default.
+
+.SH STDOUT
+The
+.B setpgrp
+utility does not use the standard output unless the
+.B -p
+option is specified, however the
+.I command
+it starts may.
+
+.SH STDERR
+The standard error is used for diagnostic messages and the
+password prompt. The
+.I command
+the
+.B setpgrp
+utility starts may also use the standard error.
+
+.SH OUTPUT FILES
+None.
+
+.SH EXTENDED DESCRIPTION
+None.
+
+.SH EXIT STATUS
+If the
+.B setpgrp
+utility fails it will exit withone of the following statuses:
+.TP
+125
+A error occurred.
+.TP
+126
+The process failed to change process image.
+.TP
+127
+The specified command was not found.
+.PP
+If the
+.B setpgrp
+utility is successful, the exit status is defined by the
+.I command
+it starts.
+
+.SH CONSEQUENCES OF ERRORS
+Default.
+
+.SH APPLICATION USAGE
+None.
+
+.SH EXAMPLES
+None.
+
+.SH RATIONALE
+None.
+
+.SH NOTES
+None.
+
+.SH BUGS
+None.
+
+.SH FUTURE DIRECTIONS
+None.
+
+.SH SEE ALSO
+.BR setpgid (2),
+.BR getpgrp (1)
diff --git a/setpgrp.c b/setpgrp.c
new file mode 100644
index 0000000..1cb75fc
--- /dev/null
+++ b/setpgrp.c
@@ -0,0 +1,82 @@
+/* See LICENSE file for copyright and license details. */
+#include <errno.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "arg.h"
+
+#define EXIT_ERROR  125
+#define EXIT_EXEC   126
+#define EXIT_NOENT  127
+
+
+char *argv0;
+
+static void
+usage(void)
+{
+	fprintf(stderr, "usage: %s [-e variable] [-pv] command [argument] ...\n", argv0);
+	exit(EXIT_ERROR);
+}
+
+int
+main(int argc, char *argv[])
+{
+	char group_str[3 * sizeof(pid_t) + 1];
+	int print_to_stdout = 0;
+	int print_to_stderr = 0;
+	char *export = NULL;
+	pid_t group;
+
+	ARGBEGIN {
+	case 'e':
+		export = EARGF(usage());
+		if (!*export)
+			usage();
+		break;
+	case 'p':
+		print_to_stdout = 1;
+		break;
+	case 'v':
+		print_to_stderr = 1;
+		break;
+	default:
+		usage();
+	} ARGEND;
+
+	if (!argc)
+		usage();
+
+	if (setpgid(0, 0)) {
+		fprintf(stderr, "%s: setpgid 0 0: %s\n", argv0, strerror(errno));
+		return EXIT_ERROR;
+	}
+	group = getpgrp();
+
+	if (print_to_stdout) {
+		printf("%ji\n", (intmax_t)group);
+		if (fflush(stdout) || ferror(stdout)) {
+			fprintf(stderr, "%s: printf: %s\n", argv0, strerror(errno));
+			return EXIT_ERROR;
+		}
+	}
+
+	if (export) {
+		sprintf(group_str, "%ji", (intmax_t)group);
+		if (setenv(export, group_str, 1)) {
+			fprintf(stderr, "%s: setenv %s %s 1: %s\n", argv0, export, group_str, strerror(errno));
+			return EXIT_ERROR;
+		}
+	}
+
+	if (print_to_stderr)
+		fprintf(stderr, "%s: running %s in process group %ji\n", argv0, argv[0], (intmax_t)group);
+
+	execvp(argv[0], argv);
+	fprintf(stderr, "%s: execvp %s: %s\n", argv0, argv[0], strerror(errno));
+	return errno == ENOENT ? EXIT_NOENT : EXIT_EXEC;
+}
diff --git a/src/getpgrp.c b/src/getpgrp.c
deleted file mode 100644
index 47dafcf..0000000
--- a/src/getpgrp.c
+++ /dev/null
@@ -1,28 +0,0 @@
-/**
- * setpgrep — run a program in a new process group
- * Copyright © 2014  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 <unistd.h>
-#include <stdio.h>
-#include <stdint.h>
-
-
-int main(void)
-{
-  pid_t group = getpgrp();
-  return printf("%ji\n", (intmax_t)group) < 0;
-}
-
diff --git a/src/setpgrp.c b/src/setpgrp.c
deleted file mode 100644
index 0f76ea9..0000000
--- a/src/setpgrp.c
+++ /dev/null
@@ -1,98 +0,0 @@
-/**
- * setpgrep — run a program in a new process group
- * Copyright © 2014  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 <unistd.h>
-#include <stdio.h>
-#include <stdint.h>
-#include <stdlib.h>
-#include <string.h>
-#include <stddef.h>
-
-
-int main(int argc, char* argv[])
-{
-  int switch_print = 0;
-  int switch_export = 0;
-  int switch_help = 0;
-  pid_t group;
-  char** args;
-  int off;
-  
-  for (off = 1; off < argc; off++)
-    if (!strcmp(argv[off], "--print"))
-      switch_print = 1;
-    else if (!strcmp(argv[off], "--export"))
-      {
-	switch_export = ++off;
-	if (off == argc)
-	  goto help;
-      }
-    else if (!strcmp(argv[off], "--help"))
-      {
-	switch_help = 1;
-	goto help;
-      }
-    else if (!strcmp(argv[off], "--"))
-      {
-	off++;
-	break;
-      }
-    else if (argv[off][0] != '-')
-      break;
-    else
-      goto help;
-  
-  group = setpgid(0, 0);
-  if (group == (pid_t)-1)
-    goto fail;
-  group = getpgrp();
-  
-  args = malloc((size_t)(argc - off + 1) * sizeof(char*));
-  if (args == NULL)
-    goto fail;
-  
-  memcpy(args, argv + off, (size_t)(argc - off) * sizeof(char*));
-  args[argc - off] = NULL;
-  
-  if (switch_print)
-    if (printf("%ji\n", (intmax_t)group) < 0)
-      goto fail;
-  
-  if (switch_export)
-    {
-      char group_str[3 * sizeof(pid_t) + 1];
-      if (sprintf(group_str, "%ji", (intmax_t)group) < 0)
-	goto fail;
-      if (setenv(argv[switch_export], group_str, 1) < 0)
-	goto fail;
-    }
-  
-  execvp(args[0], args);
-  
- fail:
-  perror(*argv);
-  return 1;
-  
- help:
-  printf("USAGE: %s [options] [--] [command...]\n", *argv);
-  printf("\n");
-  printf("    --print       Print the process group to stdout.\n");
-  printf("    --export VAR  Export the process group to the ENV environment variable.\n");
-  printf("\n");
-  return !switch_help;
-}
-