sysdeps/posix/sigsuspend.c

   1 /* Copyright (C) 1991-2024 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <signal.h>
  20 #include <stddef.h>
  21 #include <unistd.h>
  22
  23
  24 /* Change the set of blocked signals to SET,
  25    wait until a signal arrives, and restore the set of blocked signals.  */
  26 int
  27 __sigsuspend (const sigset_t *set)
  28 {
  29   sigset_t oset;
  30   int save;
  31
  32   if (set == NULL)
  33     {
  34       __set_errno (EINVAL);
  35       return -1;
  36     }
  37
  38   if (sigprocmask (SIG_SETMASK, set, &oset) < 0)
  39     return -1;
  40
  41   (void) pause();
  42   save = errno;
  43
  44   if (sigprocmask (SIG_SETMASK, &oset, (sigset_t *) NULL) < 0)
  45     return -1;
  46
  47   __set_errno (save);
  48   return -1;
  49 }
  50 libc_hidden_def (__sigsuspend)
  51 weak_alias (__sigsuspend, sigsuspend)