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  
      21  #include <sigset-cvt-mask.h>
      22  
      23  /* Block signals in MASK, returning the old mask.  */
      24  int
      25  __sigblock (int mask)
      26  {
      27    sigset_t set, oset;
      28  
      29    if (sigset_set_old_mask (&set, mask) < 0)
      30      return -1;
      31  
      32    if (__sigprocmask (SIG_BLOCK, &set, &oset) < 0)
      33      return -1;
      34  
      35    return sigset_get_old_mask (&oset);
      36  }
      37  
      38  libc_hidden_def (__sigblock)
      39  weak_alias (__sigblock, sigblock)