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glibc  2.9
sigprocmask.c
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00001 /* Copyright (C) 1993, 1995, 1997, 2003 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003    Contributed by David Mosberger (davidm@azstarnet.com).
00004 
00005    The GNU C Library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Lesser General Public
00007    License as published by the Free Software Foundation; either
00008    version 2.1 of the License, or (at your option) any later version.
00009 
00010    The GNU C Library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Lesser General Public License for more details.
00014 
00015    You should have received a copy of the GNU Lesser General Public
00016    License along with the GNU C Library; if not, write to the Free
00017    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00018    02111-1307 USA.  */
00019 
00020 #include <errno.h>
00021 #include <sysdep.h>
00022 #include <signal.h>
00023 
00024 /* When there is kernel support for more than 64 signals, we'll have to
00025    switch to a new system call convention here.  */
00026 
00027 int
00028 __sigprocmask (int how, const sigset_t *set, sigset_t *oset)
00029 {
00030   unsigned long int setval;
00031   long result;
00032 
00033   if (set)
00034     setval = set->__val[0];
00035   else
00036     {
00037       setval = 0;
00038       how = SIG_BLOCK;      /* ensure blocked mask doesn't get changed */
00039     }
00040 
00041   result = INLINE_SYSCALL (osf_sigprocmask, 2, how, setval);
00042   if (result == -1)
00043     /* If there are ever more than 63 signals, we need to recode this
00044        in assembler since we wouldn't be able to distinguish a mask of
00045        all 1s from -1, but for now, we're doing just fine... */
00046     return result;
00047 
00048   if (oset)
00049     {
00050       oset->__val[0] = result;
00051       result = _SIGSET_NWORDS;
00052       while (--result > 0)
00053        oset->__val[result] = 0;
00054     }
00055   return 0;
00056 }
00057 
00058 weak_alias (__sigprocmask, sigprocmask);