nptl/pthread_sigmask.c

   1 /* Copyright (C) 2002-2021 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    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <signal.h>
  20 #include <pthreadP.h>
  21 #include <sysdep.h>
  22 #include <shlib-compat.h>
  23
  24 int
  25 __pthread_sigmask (int how, const sigset_t *newmask, sigset_t *oldmask)
  26 {
  27   sigset_t local_newmask;
  28
  29   /* The only thing we have to make sure here is that SIGCANCEL and
  30      SIGSETXID is not blocked.  */
  31   if (newmask != NULL
  32       && (__glibc_unlikely (__sigismember (newmask, SIGCANCEL))
  33          || __glibc_unlikely (__sigismember (newmask, SIGSETXID))))
  34     {
  35       local_newmask = *newmask;
  36       __clear_internal_signals (&local_newmask);
  37       newmask = &local_newmask;
  38     }
  39
  40   /* We know that realtime signals are available if NPTL is used.  */
  41   int result = INTERNAL_SYSCALL_CALL (rt_sigprocmask, how, newmask,
  42                                       oldmask, __NSIG_BYTES);
  43
  44   return (INTERNAL_SYSCALL_ERROR_P (result)
  45           ? INTERNAL_SYSCALL_ERRNO (result)
  46           : 0);
  47 }
  48 libc_hidden_def (__pthread_sigmask)
  49
  50 versioned_symbol (libc, __pthread_sigmask, pthread_sigmask, GLIBC_2_32);
  51 #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_32)
  52 strong_alias (__pthread_sigmask, __pthread_sigmask_2);
  53 compat_symbol (libc, __pthread_sigmask_2, pthread_sigmask, GLIBC_2_0);
  54 #endif