sysdeps/unix/sysv/linux/wait.c

   1 /* Copyright (C) 1991-2015 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 <sys/wait.h>
  19 #include <errno.h>
  20 #include <sys/resource.h>
  21 #include <stddef.h>
  22 #include <sysdep-cancel.h>
  23
  24 /* Wait for a child to die.  When one does, put its status in *STAT_LOC
  25    and return its process ID.  For errors, return (pid_t) -1.  */
  26 pid_t
  27 __libc_wait (__WAIT_STATUS_DEFN stat_loc)
  28 {
  29   if (SINGLE_THREAD_P)
  30     return INLINE_SYSCALL (wait4, 4, WAIT_ANY, stat_loc, 0,
  31                            (struct rusage *) NULL);
  32
  33   int oldtype = LIBC_CANCEL_ASYNC ();
  34
  35   pid_t result = INLINE_SYSCALL (wait4, 4, WAIT_ANY, stat_loc, 0,
  36                                  (struct rusage *) NULL);
  37
  38   LIBC_CANCEL_RESET (oldtype);
  39
  40   return result;
  41 }
  42
  43 weak_alias (__libc_wait, __wait)
  44 weak_alias (__libc_wait, wait)