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glibc  2.9
sigprocmask.c
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00001 /* Copyright (C) 1991, 1995, 1996, 1997 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <errno.h>
00020 #include <signal.h>
00021 
00022 
00023 /* If SET is not NULL, modify the current set of blocked signals
00024    according to HOW, which may be SIG_BLOCK, SIG_UNBLOCK or SIG_SETMASK.
00025    If OSET is not NULL, store the old set of blocked signals in *OSET.  */
00026 int
00027 __sigprocmask (how, set, oset)
00028      int how;
00029      const sigset_t *set;
00030      sigset_t *oset;
00031 {
00032   switch (how)
00033     {
00034     case SIG_BLOCK:
00035     case SIG_UNBLOCK:
00036     case SIG_SETMASK:
00037       break;
00038     default:
00039       __set_errno (EINVAL);
00040       return -1;
00041     }
00042 
00043   __set_errno (ENOSYS);
00044   return -1;
00045 }
00046 
00047 /* No stub warning because abort calls __sigprocmask,
00048    and we don't want warnings for every use of abort on
00049    a system without safe signals.  */
00050 
00051 weak_alias (__sigprocmask, sigprocmask)