sysdeps/unix/sysv/linux/wait.c

   1 /* Copyright (C) 1991, 1995, 1996, 1997, 2002 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, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <sys/wait.h>
  20 #include <errno.h>
  21 #include <sys/resource.h>
  22 #include <stddef.h>
  23 #include <sysdep-cancel.h>
  24
  25 /* Wait for a child to die.  When one does, put its status in *STAT_LOC
  26    and return its process ID.  For errors, return (pid_t) -1.  */
  27 __pid_t
  28 __libc_wait (__WAIT_STATUS_DEFN stat_loc)
  29 {
  30   if (SINGLE_THREAD_P)
  31     return INLINE_SYSCALL (wait4, 4, WAIT_ANY, stat_loc, 0,
  32                            (struct rusage *) NULL);
  33
  34   int oldtype = LIBC_CANCEL_ASYNC ();
  35
  36   int result = INLINE_SYSCALL (wait4, 4, WAIT_ANY, stat_loc, 0,
  37                                (struct rusage *) NULL);
  38
  39   LIBC_CANCEL_RESET (oldtype);
  40
  41   return result;
  42 }
  43
  44 weak_alias (__libc_wait, __wait)
  45 weak_alias (__libc_wait, wait)