nptl/sysdeps/pthread/pthread_sigmask.c

   1 /* Copyright (C) 2002-2014 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, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <signal.h>
  21 #include <pthreadP.h>
  22 #include <sysdep.h>
  23
  24
  25 int
  26 pthread_sigmask (how, newmask, oldmask)
  27      int how;
  28      const sigset_t *newmask;
  29      sigset_t *oldmask;
  30 {
  31   sigset_t local_newmask;
  32
  33   /* The only thing we have to make sure here is that SIGCANCEL and
  34      SIGSETXID is not blocked.  */
  35   if (newmask != NULL
  36       && (__builtin_expect (__sigismember (newmask, SIGCANCEL), 0)
  37           || __builtin_expect (__sigismember (newmask, SIGSETXID), 0)))
  38     {
  39       local_newmask = *newmask;
  40       __sigdelset (&local_newmask, SIGCANCEL);
  41       __sigdelset (&local_newmask, SIGSETXID);
  42       newmask = &local_newmask;
  43     }
  44
  45 #ifdef INTERNAL_SYSCALL
  46   /* We know that realtime signals are available if NPTL is used.  */
  47   INTERNAL_SYSCALL_DECL (err);
  48   int result = INTERNAL_SYSCALL (rt_sigprocmask, err, 4, how, newmask,
  49                                  oldmask, _NSIG / 8);
  50
  51   return (INTERNAL_SYSCALL_ERROR_P (result, err)
  52           ? INTERNAL_SYSCALL_ERRNO (result, err)
  53           : 0);
  54 #else
  55   return sigprocmask (how, newmask, oldmask) == -1 ? errno : 0;
  56 #endif
  57 }