sysdeps/unix/sysv/linux/raise.c

   1 /* Copyright (C) 2002-2017 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 <signal.h>
  20 #include <sysdep.h>
  21 #include <errno.h>
  22 #include <sys/types.h>
  23 #include <unistd.h>
  24 #include <nptl-signals.h>
  25
  26 int
  27 raise (int sig)
  28 {
  29   /* rt_sigprocmask may fail if:
  30
  31      1. sigsetsize != sizeof (sigset_t) (EINVAL)
  32      2. a failure in copy from/to user space (EFAULT)
  33      3. an invalid 'how' operation (EINVAL)
  34
  35      The first case is already handle in glibc syscall call by using the arch
  36      defined _NSIG.  Second case is handled by using a stack allocated mask.
  37      The last one should be handled by the block/unblock functions.  */
  38
  39   sigset_t set;
  40   __libc_signal_block_app (&set);
  41
  42   INTERNAL_SYSCALL_DECL (err);
  43   pid_t pid = INTERNAL_SYSCALL (getpid, err, 0);
  44   pid_t tid = INTERNAL_SYSCALL (gettid, err, 0);
  45
  46   int ret = INLINE_SYSCALL (tgkill, 3, pid, tid, sig);
  47
  48   __libc_signal_restore_set (&set);
  49
  50   return ret;
  51 }
  52 libc_hidden_def (raise)
  53 weak_alias (raise, gsignal)