gio/gio-launch-desktop.c

   1 /* GIO - GLib Input, Output and Streaming Library
   2  *
   3  * Copyright (C) 2018 Endless Mobile, Inc.
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2.1 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General
  16  * Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
  17  *
  18  * Author: Daniel Drake <drake@endlessm.com>
  19  */
  20
  21 /*
  22  * gio-launch-desktop: GDesktopAppInfo helper
  23  * Executable wrapper to set GIO_LAUNCHED_DESKTOP_FILE_PID
  24  * There are complications when doing this in a fork()/exec() codepath,
  25  * and it cannot otherwise be done with posix_spawn().
  26  * This wrapper is designed to be minimal and lightweight.
  27  * It does not even link against glib.
  28  */
  29
  30 #include <stdio.h>
  31 #include <stdlib.h>
  32 #include <sys/types.h>
  33 #include <unistd.h>
  34
  35 int
  36 main (int argc, char *argv[])
  37 {
  38   pid_t pid = getpid ();
  39   char buf[50];
  40   int r;
  41
  42   if (argc < 2)
  43     return -1;
  44
  45   r = snprintf (buf, sizeof (buf), "GIO_LAUNCHED_DESKTOP_FILE_PID=%ld", (long) pid);
  46   if (r >= sizeof (buf))
  47     return -1;
  48
  49   putenv (buf);
  50
  51   return execvp (argv[1], argv + 1);
  52 }