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 launch_only_once(const char *uri)
  35 {
  36         pid_t dummy = 0;
  37         posix_spawn_file_actions_t fa;
  38         int kill_fa = 0;
  39         posix_spawnattr_t sa;
  40         int kill_sa = 0;
  41         char *uridup = strdup(uri);
  42         char *prog = strdup("mpv");
  43         char *quiet = strdup("--quiet");
  44         char * const argv[4] = { prog, quiet, uridup, 0 };
  45
  46         if (!uridup ||
  47             !prog ||
  48             !quiet) {
  49                 goto done;
  50         }
  51
  52         if (posix_spawn_file_actions_init(&fa)) {
  53                 PERROR_MESSAGE("posix_spawn_file_actions_init");
  54                 goto done;
  55         }
  56
  57         kill_fa = 1;
  58
  59         if (posix_spawnattr_init(&sa)) {
  60                 PERROR_MESSAGE("posix_spawnattr_init");
  61                 goto done;
  62         }
  63
  64         kill_sa = 1;
  65
  66         if (posix_spawn_file_actions_addclose(&fa, 0)) {
  67                 PERROR_MESSAGE("posix_spawn_file_actions_addclose");
  68                 goto done;
  69         }
  70
  71         if (posix_spawn_file_actions_addclose(&fa, 1)) {
  72                 PERROR_MESSAGE("posix_spawn_file_actions_addclose");
  73                 goto done;
  74         }
  75
  76         if (posix_spawn_file_actions_addclose(&fa, 2)) {
  77                 PERROR_MESSAGE("posix_spawn_file_actions_addclose");
  78                 goto done;
  79         }
  80
  81         if (posix_spawnattr_setflags(&sa, POSIX_SPAWN_SETSIGDEF)) {
  82                 PERROR_MESSAGE("posix_spawnattr_setflags");
  83                 goto done;
  84         }
  85
  86         if (posix_spawn_file_actions_addopen(&fa, 0, "/dev/null", O_RDONLY,
  87                                              0)) {
  88                 PERROR_MESSAGE("posix_spawn_file_actions_addopen");
  89                 goto done;
  90         }
  91
  92         if (posix_spawn_file_actions_addopen(&fa, 1, "/dev/null", O_WRONLY,
  93                                              0)) {
  94                 PERROR_MESSAGE("posix_spawn_file_actions_addopen");
  95                 goto done;
  96         }
  97
  98         if (posix_spawn_file_actions_adddup2(&fa, 1, 2)) {
  99                 PERROR_MESSAGE("posix_spawn_file_actions_adddup2");
 100                 goto done;
 101         }
 102
 103         posix_spawnp(&dummy, "mpv-with-load-screen", &fa, &sa, argv, environ);
 104 done:
 105
 106         if (kill_fa) {
 107                 posix_spawn_file_actions_destroy(&fa);
 108         }
 109
 110         if (kill_sa) {
 111                 posix_spawnattr_destroy(&sa);
 112         }
 113
 114         free(uridup);
 115 }