sysdeps/unix/sysv/linux/waitpid.c

   1 /* Copyright (C) 1991-2014 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 <sysdep-cancel.h>
  20 #include <stdlib.h>
  21 #include <sys/wait.h>
  22
  23 __pid_t
  24 __libc_waitpid (__pid_t pid, int *stat_loc, int options)
  25 {
  26   if (SINGLE_THREAD_P)
  27     {
  28 #ifdef __NR_waitpid
  29       return INLINE_SYSCALL (waitpid, 3, pid, stat_loc, options);
  30 #else
  31       return INLINE_SYSCALL (wait4, 4, pid, stat_loc, options, NULL);
  32 #endif
  33     }
  34
  35   int oldtype = LIBC_CANCEL_ASYNC ();
  36
  37 #ifdef __NR_waitpid
  38   int result = INLINE_SYSCALL (waitpid, 3, pid, stat_loc, options);
  39 #else
  40   int result = INLINE_SYSCALL (wait4, 4, pid, stat_loc, options, NULL);
  41 #endif
  42
  43   LIBC_CANCEL_RESET (oldtype);
  44
  45   return result;
  46 }
  47 weak_alias (__libc_waitpid, __waitpid)
  48 libc_hidden_weak (__waitpid)
  49 weak_alias (__libc_waitpid, waitpid)