/**
* 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 "arg.h"
#include <libcoopgamma.h>
#include <errno.h>
#include <inttypes.h>
#include <poll.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/**
* The libcoopgamma context
*/
static libcoopgamma_context_t cg;
/**
* Print usage information and exit
*/
static void usage(void)
{
fprintf(stderr,
"Usage: %s [-M method] [-S site] [-c crtc]... class...\n",
argv0);
exit(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;
}
/**
* Remove selected filters from selected CRTC:s
*
* @param crtcs `NULL`-terminated list of CRTC names
* @param classes `NULL`-terminated list of filter classes
* @return Zero on success, -1 on error, -2 on
* libcoopgamma error
*/
static int remove_filters(char* const* restrict crtcs, char* const* restrict classes)
{
size_t n = 0, unsynced = 0, selected, i, j;
char* synced = NULL;
libcoopgamma_async_context_t* asyncs = NULL;
int saved_errno, need_flush = 0, ret = 0;
struct pollfd pollfd;
libcoopgamma_filter_t command;
for (i = 0; crtcs[i] != NULL; i++);
for (j = 0; classes[j] != NULL; j++);
synced = calloc(i, j * sizeof(*synced));
if (synced == NULL)
goto fail;
asyncs = calloc(i, j * sizeof(*asyncs));
if (asyncs == NULL)
goto fail;
i = j = 0;
command.lifespan = LIBCOOPGAMMA_REMOVE;
pollfd.fd = cg.fd;
pollfd.events = POLLIN | POLLRDNORM | POLLRDBAND | POLLPRI;
while ((unsynced > 0) || (crtcs[i] != NULL))
{
wait:
if (crtcs[i] != NULL)
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 (; crtcs[i] != NULL; i++, j = 0)
{
command.crtc = crtcs[i];
while (classes[j] != NULL)
{
command.class = classes[j++];
if (unsynced++, libcoopgamma_set_gamma_send(&command, &cg, asyncs + n++) < 0)
goto send_fail;
}
}
goto send_done;
send_fail:
switch (errno)
{
case EINTR:
case EAGAIN:
#if EAGAIN != EWOULDBLOCK
case EWOULDBLOCK:
#endif
need_flush = 1;
if (classes[j] == NULL)
i++, j = 0;
break;
default:
goto fail;
}
}
send_done:
if ((unsynced == 0) && (crtcs[i] == NULL))
break;
if (pollfd.revents & (POLLIN | POLLRDNORM | POLLRDBAND | POLLPRI))
while (unsynced > 0)
switch (libcoopgamma_synchronise(&cg, asyncs, n, &selected))
{
case 0:
if (synced[selected])
{
libcoopgamma_skip_message(&cg);
break;
}
synced[selected] = 1;
unsynced -= 1;
if (libcoopgamma_set_gamma_recv(&cg, asyncs + selected) < 0)
goto cg_fail;
break;
default:
switch (errno)
{
case 0:
break;
case EINTR:
case EAGAIN:
#if EAGAIN != EWOULDBLOCK
case EWOULDBLOCK:
#endif
goto wait;
default:
goto fail;
}
break;
}
}
done:
saved_errno = errno;
free(synced);
free(asyncs);
errno = saved_errno;
return ret;
fail:
ret = -1;
goto done;
cg_fail:
ret = -2;
goto done;
}
/**
* -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.
*
* Can be used multiple times. If not used, all
* CRTC:s are selected.
*
* @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 rc = 0;
char* method = NULL;
char* site = NULL;
char** crtcs_ = NULL;
char** crtcs = alloca(argc * sizeof(char*));
size_t i, crtc_n = 0;
ARGBEGIN
{
case 'M':
if (method != NULL)
usage();
method = EARGF(usage());
break;
case 'S':
if (site != NULL)
usage();
site = EARGF(usage());
break;
case 'c':
crtcs[crtc_n++] = EARGF(usage());
break;
}
ARGEND;
if (initialise_proc() < 0)
goto fail;
if ((method != NULL) && !strcmp(method, "?"))
{
if ((site != NULL) || (crtc_n > 0) || (argc > 0))
usage();
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++;
for (i = 0; i < crtc_n; i++)
if (!strcmp(crtcs[i], "?"))
{
if (argc > 0)
usage();
switch (list_crtcs())
{
case 0:
goto done;
case -1:
goto fail;
default:
goto cg_fail;
}
}
if (argc == 0)
usage();
if (crtc_n == 0)
{
crtcs = crtcs_ = libcoopgamma_get_crtcs_sync(&cg);
if (crtcs == NULL)
goto cg_fail;
}
else
crtcs[crtc_n] = NULL;
if (libcoopgamma_set_nonblocking(&cg, 1) < 0)
goto fail;
switch (remove_filters(crtcs, argv))
{
case 0:
break;
case -1:
goto fail;
default:
goto cg_fail;
}
done:
if (stage >= 1)
libcoopgamma_context_destroy(&cg, stage >= 2);
free(crtcs_);
return rc;
custom_fail:
rc = 1;
goto done;
fail:
rc = 1;
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;
}
