nptl/sysdeps/pthread/pthread_sigmask.c

   1 /* Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <errno.h>
  21 #include <signal.h>
  22 #include <pthreadP.h>
  23 #include <sysdep.h>
  24
  25
  26 int
  27 pthread_sigmask (how, newmask, oldmask)
  28      int how;
  29      const sigset_t *newmask;
  30      sigset_t *oldmask;
  31 {
  32   sigset_t local_newmask;
  33
  34   /* The only thing we have to make sure here is that SIGCANCEL and
  35      SIGSETXID is not blocked.  */
  36   if (newmask != NULL
  37       && (__builtin_expect (__sigismember (newmask, SIGCANCEL), 0)
  38           || __builtin_expect (__sigismember (newmask, SIGSETXID), 0)))
  39     {
  40       local_newmask = *newmask;
  41       __sigdelset (&local_newmask, SIGCANCEL);
  42       __sigdelset (&local_newmask, SIGSETXID);
  43       newmask = &local_newmask;
  44     }
  45
  46 #ifdef INTERNAL_SYSCALL
  47   /* We know that realtime signals are available if NPTL is used.  */
  48   INTERNAL_SYSCALL_DECL (err);
  49   int result = INTERNAL_SYSCALL (rt_sigprocmask, err, 4, how, newmask,
  50                                  oldmask, _NSIG / 8);
  51
  52   return (INTERNAL_SYSCALL_ERROR_P (result, err)
  53           ? INTERNAL_SYSCALL_ERRNO (result, err)
  54           : 0);
  55 #else
  56   return sigprocmask (how, newmask, oldmask) == -1 ? errno : 0;
  57 #endif
  58 }