launch.c

   1 /*
   2  * Copyright (c) 2018, De Rais <derais@cock.li>
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for
   5  * any purpose with or without fee is hereby granted, provided that the
   6  * above copyright notice and this permission notice appear in all
   7  * copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
  10  * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
  11  * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
  12  * AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  13  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  14  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  15  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  16  * PERFORMANCE OF THIS SOFTWARE.
  17  */
  18 #include <errno.h>
  19 #include <spawn.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23
  24 #include <fcntl.h>
  25 #include <sys/stat.h>
  26 #include <sys/types.h>
  27 #include <sys/wait.h>
  28
  29 #include "cycon.h"
  30 #include "macros.h"
  31
  32 extern char **environ;
  33
  34 void
  35 launch_only_once(const char *uri)
  36 {
  37         pid_t dummy = 0;
  38         posix_spawn_file_actions_t fa;
  39         int kill_fa = 0;
  40         posix_spawnattr_t sa;
  41         int kill_sa = 0;
  42         char *uridup = strdup(uri);
  43         char *prog = strdup("mpv");
  44         char *quiet = strdup("--quiet");
  45         char * const argv[4] = { prog, quiet, uridup, 0 };
  46
  47         if (!uridup ||
  48             !prog ||
  49             !quiet) {
  50                 goto done;
  51         }
  52
  53         if (posix_spawn_file_actions_init(&fa)) {
  54                 PERROR_MESSAGE("posix_spawn_file_actions_init");
  55                 goto done;
  56         }
  57
  58         kill_fa = 1;
  59
  60         if (posix_spawnattr_init(&sa)) {
  61                 PERROR_MESSAGE("posix_spawnattr_init");
  62                 goto done;
  63         }
  64
  65         kill_sa = 1;
  66
  67         if (posix_spawn_file_actions_addclose(&fa, 0)) {
  68                 PERROR_MESSAGE("posix_spawn_file_actions_addclose");
  69                 goto done;
  70         }
  71
  72         if (posix_spawn_file_actions_addclose(&fa, 1)) {
  73                 PERROR_MESSAGE("posix_spawn_file_actions_addclose");
  74                 goto done;
  75         }
  76
  77         if (posix_spawn_file_actions_addclose(&fa, 2)) {
  78                 PERROR_MESSAGE("posix_spawn_file_actions_addclose");
  79                 goto done;
  80         }
  81
  82         if (posix_spawnattr_setflags(&sa, POSIX_SPAWN_SETSIGDEF)) {
  83                 PERROR_MESSAGE("posix_spawnattr_setflags");
  84                 goto done;
  85         }
  86
  87         if (posix_spawn_file_actions_addopen(&fa, 0, "/dev/null", O_RDONLY,
  88                                              0)) {
  89                 PERROR_MESSAGE("posix_spawn_file_actions_addopen");
  90                 goto done;
  91         }
  92
  93         if (posix_spawn_file_actions_addopen(&fa, 1, "/dev/null", O_WRONLY,
  94                                              0)) {
  95                 PERROR_MESSAGE("posix_spawn_file_actions_addopen");
  96                 goto done;
  97         }
  98
  99         if (posix_spawn_file_actions_adddup2(&fa, 1, 2)) {
 100                 PERROR_MESSAGE("posix_spawn_file_actions_adddup2");
 101                 goto done;
 102         }
 103
 104         posix_spawnp(&dummy, "mpv-with-load-screen", &fa, &sa, argv, environ);
 105 done:
 106
 107         if (kill_fa) {
 108                 posix_spawn_file_actions_destroy(&fa);
 109         }
 110
 111         if (kill_sa) {
 112                 posix_spawnattr_destroy(&sa);
 113         }
 114
 115         free(uridup);
 116         free(prog);
 117         free(quiet);
 118 }