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, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <errno.h>
  20 #include <signal.h>
  21
  22
  23 /* If SET is not NULL, modify the current set of blocked signals
  24    according to HOW, which may be SIG_BLOCK, SIG_UNBLOCK or SIG_SETMASK.
  25    If OSET is not NULL, store the old set of blocked signals in *OSET.  */
  26 int
  27 __sigprocmask (how, set, oset)
  28      int how;
  29      const sigset_t *set;
  30      sigset_t *oset;
  31 {
  32   switch (how)
  33     {
  34     case SIG_BLOCK:
  35     case SIG_UNBLOCK:
  36     case SIG_SETMASK:
  37       break;
  38     default:
  39       __set_errno (EINVAL);
  40       return -1;
  41     }
  42
  43   __set_errno (ENOSYS);
  44   return -1;
  45 }
  46
  47 /* No stub warning because abort calls __sigprocmask,
  48    and we don't want warnings for every use of abort on
  49    a system without safe signals.  */
  50
  51 weak_alias (__sigprocmask, sigprocmask)