1  /* Copyright (C) 1991-2023 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)