sysdeps/unix/sysv/linux/gai_sigqueue.c

   1 /* Copyright (C) 2001-2018 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 <netdb.h>
  20 #include <signal.h>
  21 #include <string.h>
  22 #include <unistd.h>
  23
  24 #include <sysdep.h>
  25 #include <sys/syscall.h>
  26
  27 #include "gai_misc.h"
  28
  29 #ifdef __NR_rt_sigqueueinfo
  30
  31 /* Return any pending signal or wait for one for the given time.  */
  32 int
  33 __gai_sigqueue (int sig, const union sigval val, pid_t caller_pid)
  34 {
  35   siginfo_t info;
  36
  37   /* First, clear the siginfo_t structure, so that we don't pass our
  38      stack content to other tasks.  */
  39   memset (&info, 0, sizeof (siginfo_t));
  40   /* We must pass the information about the data in a siginfo_t value.  */
  41   info.si_signo = sig;
  42   info.si_code = SI_ASYNCNL;
  43   info.si_pid = caller_pid;
  44   info.si_uid = __getuid ();
  45   info.si_value = val;
  46
  47   return INLINE_SYSCALL (rt_sigqueueinfo, 3, info.si_pid, sig, &info);
  48 }
  49 #else
  50 # include <resolv/gai_sigqueue.c>
  51 #endif