sysdeps/unix/sysv/linux/sigqueue.c

   1 /* Copyright (C) 1997-2017 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    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <signal.h>
  20 #include <unistd.h>
  21 #include <string.h>
  22
  23 #include <sysdep.h>
  24 #include <sys/syscall.h>
  25
  26 #ifdef __NR_rt_sigqueueinfo
  27 /* Return any pending signal or wait for one for the given time.  */
  28 int
  29 __sigqueue (pid_t pid, int sig, const union sigval val)
  30 {
  31   siginfo_t info;
  32
  33   /* First, clear the siginfo_t structure, so that we don't pass our
  34      stack content to other tasks.  */
  35   memset (&info, 0, sizeof (siginfo_t));
  36   /* We must pass the information about the data in a siginfo_t value.  */
  37   info.si_signo = sig;
  38   info.si_code = SI_QUEUE;
  39   info.si_pid = __getpid ();
  40   info.si_uid = __getuid ();
  41   info.si_value = val;
  42
  43   return INLINE_SYSCALL (rt_sigqueueinfo, 3, pid, sig, &info);
  44 }
  45 weak_alias (__sigqueue, sigqueue)
  46 #else
  47 # include <signal/sigqueue.c>
  48 #endif