nptl/pthread_sigmask.c

   1 /* Copyright (C) 2002-2022 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <signal.h>
  19 #include <pthreadP.h>
  20 #include <sysdep.h>
  21 #include <shlib-compat.h>
  22
  23 int
  24 __pthread_sigmask (int how, const sigset_t *newmask, sigset_t *oldmask)
  25 {
  26   sigset_t local_newmask;
  27
  28   /* The only thing we have to make sure here is that SIGCANCEL and
  29      SIGSETXID is not blocked.  */
  30   if (newmask != NULL
  31       && (__glibc_unlikely (__sigismember (newmask, SIGCANCEL))
  32          || __glibc_unlikely (__sigismember (newmask, SIGSETXID))))
  33     {
  34       local_newmask = *newmask;
  35       clear_internal_signals (&local_newmask);
  36       newmask = &local_newmask;
  37     }
  38
  39   /* We know that realtime signals are available if NPTL is used.  */
  40   int result = INTERNAL_SYSCALL_CALL (rt_sigprocmask, how, newmask,
  41                                       oldmask, __NSIG_BYTES);
  42
  43   return (INTERNAL_SYSCALL_ERROR_P (result)
  44           ? INTERNAL_SYSCALL_ERRNO (result)
  45           : 0);
  46 }
  47 libc_hidden_def (__pthread_sigmask)
  48
  49 versioned_symbol (libc, __pthread_sigmask, pthread_sigmask, GLIBC_2_32);
  50 #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_32)
  51 strong_alias (__pthread_sigmask, __pthread_sigmask_2);
  52 compat_symbol (libc, __pthread_sigmask_2, pthread_sigmask, GLIBC_2_0);
  53 #endif