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  
      22  /* If SET is not NULL, modify the current set of blocked signals
      23     according to HOW, which may be SIG_BLOCK, SIG_UNBLOCK or SIG_SETMASK.
      24     If OSET is not NULL, store the old set of blocked signals in *OSET.  */
      25  int
      26  __sigprocmask (int how, const sigset_t *set, sigset_t *oset)
      27  {
      28    switch (how)
      29      {
      30      case SIG_BLOCK:
      31      case SIG_UNBLOCK:
      32      case SIG_SETMASK:
      33        break;
      34      default:
      35        __set_errno (EINVAL);
      36        return -1;
      37      }
      38  
      39    __set_errno (ENOSYS);
      40    return -1;
      41  }
      42  
      43  /* No stub warning because abort calls __sigprocmask,
      44     and we don't want warnings for every use of abort on
      45     a system without safe signals.  */
      46  
      47  libc_hidden_def (__sigprocmask)
      48  weak_alias (__sigprocmask, sigprocmask)