compat/sigwait.c

   1 /*****************************************************************************
   2  * sigwait.c: POSIX sigwait() replacement
   3  *****************************************************************************
   4  * Copyright © 2017 VLC authors and VideoLAN
   5  *
   6  * Author: Julian Scheel <julian@jusst.de>
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU Lesser General Public License as published by
  10  * the Free Software Foundation; either version 2.1 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16  * GNU Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public License
  19  * along with this program; if not, write to the Free Software Foundation,
  20  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  21  *****************************************************************************/
  22
  23 #ifdef HAVE_CONFIG_H
  24 # include <config.h>
  25 #endif
  26
  27 #ifdef __native_client__
  28 /* NaCl has no working sigwait, but SIGPIPE, for which vlc uses sigwait
  29  * currently, is never generated in NaCl. So for SIGPIPE it's safe to instantly
  30  * return, for all others run into an assertion. */
  31
  32 #include <assert.h>
  33 #include <signal.h>
  34
  35 int sigwait(const sigset_t *set, int *sig)
  36 {
  37     sigset_t s = *set;
  38     if (sigemptyset(&s))
  39         return 0;
  40     assert(sigismember(&s, SIGPIPE));
  41     sigdelset(&s, SIGPIPE);
  42     assert(sigemptyset(&s));
  43
  44     *sig = SIGPIPE;
  45     return 0;
  46 }
  47 #else
  48 # error sigwait not implemented on your platform!
  49 #endif