sysdeps/unix/sysv/linux/sigprocmask.c

   1 /* Copyright (C) 1997-2020 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 <nptl/pthreadP.h>              /* SIGCANCEL, SIGSETXID */
  20
  21 /* Get and/or change the set of blocked signals.  */
  22 int
  23 __sigprocmask (int how, const sigset_t *set, sigset_t *oset)
  24 {
  25   sigset_t local_newmask;
  26
  27   /* The only thing we have to make sure here is that SIGCANCEL and
  28      SIGSETXID are not blocked.  */
  29   if (set != NULL
  30       && __glibc_unlikely (__sigismember (set, SIGCANCEL)
  31         || __glibc_unlikely (__sigismember (set, SIGSETXID))))
  32     {
  33       local_newmask = *set;
  34       __sigdelset (&local_newmask, SIGCANCEL);
  35       __sigdelset (&local_newmask, SIGSETXID);
  36       set = &local_newmask;
  37     }
  38
  39   return INLINE_SYSCALL_CALL (rt_sigprocmask, how, set, oset, _NSIG / 8);
  40 }
  41 libc_hidden_def (__sigprocmask)
  42 weak_alias (__sigprocmask, sigprocmask)