signal/sigprocmask.c

   1 /* Copyright (C) 1991, 1995, 1996, 1997 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    <http://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 (how, set, oset)
  27      int how;
  28      const sigset_t *set;
  29      sigset_t *oset;
  30 {
  31   switch (how)
  32     {
  33     case SIG_BLOCK:
  34     case SIG_UNBLOCK:
  35     case SIG_SETMASK:
  36       break;
  37     default:
  38       __set_errno (EINVAL);
  39       return -1;
  40     }
  41
  42   __set_errno (ENOSYS);
  43   return -1;
  44 }
  45
  46 /* No stub warning because abort calls __sigprocmask,
  47    and we don't want warnings for every use of abort on
  48    a system without safe signals.  */
  49
  50 weak_alias (__sigprocmask, sigprocmask)