sysdeps/unix/sysv/linux/sigqueue.c

   1 /* Copyright (C) 1997-2024 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 <errno.h>
  19 #include <signal.h>
  20 #include <string.h>
  21 #include <unistd.h>
  22 #include <sysdep.h>
  23
  24 /* Return any pending signal or wait for one for the given time.  */
  25 int
  26 __sigqueue (pid_t pid, int sig, const union sigval val)
  27 {
  28   siginfo_t info;
  29
  30   /* First, clear the siginfo_t structure, so that we don't pass our
  31      stack content to other tasks.  */
  32   memset (&info, 0, sizeof (siginfo_t));
  33   /* We must pass the information about the data in a siginfo_t value.  */
  34   info.si_signo = sig;
  35   info.si_code = SI_QUEUE;
  36   info.si_pid = __getpid ();
  37   info.si_uid = __getuid ();
  38   info.si_value = val;
  39
  40   return INLINE_SYSCALL_CALL (rt_sigqueueinfo, pid, sig, &info);
  41 }
  42 weak_alias (__sigqueue, sigqueue)