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glibc  2.9
pthread_sigmask.c
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00001 /* Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003    Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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 <signal.h>
00022 #include <pthreadP.h>
00023 #include <sysdep.h>
00024 
00025 
00026 int
00027 pthread_sigmask (how, newmask, oldmask)
00028      int how;
00029      const sigset_t *newmask;
00030      sigset_t *oldmask;
00031 {
00032   sigset_t local_newmask;
00033 
00034   /* The only thing we have to make sure here is that SIGCANCEL and
00035      SIGSETXID is not blocked.  */
00036   if (newmask != NULL
00037       && (__builtin_expect (__sigismember (newmask, SIGCANCEL), 0)
00038          || __builtin_expect (__sigismember (newmask, SIGSETXID), 0)))
00039     {
00040       local_newmask = *newmask;
00041       __sigdelset (&local_newmask, SIGCANCEL);
00042       __sigdelset (&local_newmask, SIGSETXID);
00043       newmask = &local_newmask;
00044     }
00045 
00046 #ifdef INTERNAL_SYSCALL
00047   /* We know that realtime signals are available if NPTL is used.  */
00048   INTERNAL_SYSCALL_DECL (err);
00049   int result = INTERNAL_SYSCALL (rt_sigprocmask, err, 4, how, newmask,
00050                              oldmask, _NSIG / 8);
00051 
00052   return (INTERNAL_SYSCALL_ERROR_P (result, err)
00053          ? INTERNAL_SYSCALL_ERRNO (result, err)
00054          : 0);
00055 #else
00056   return sigprocmask (how, newmask, oldmask) == -1 ? errno : 0;
00057 #endif
00058 }