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glibc  2.9
wait.c
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00001 /* Copyright (C) 1991,1995,1996,1997,2002,2003 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <sys/wait.h>
00020 #include <errno.h>
00021 #include <sys/resource.h>
00022 #include <stddef.h>
00023 #include <sysdep-cancel.h>
00024 
00025 /* Wait for a child to die.  When one does, put its status in *STAT_LOC
00026    and return its process ID.  For errors, return (pid_t) -1.  */
00027 pid_t
00028 __libc_wait (__WAIT_STATUS_DEFN stat_loc)
00029 {
00030   if (SINGLE_THREAD_P)
00031     return INLINE_SYSCALL (wait4, 4, WAIT_ANY, stat_loc, 0,
00032                         (struct rusage *) NULL);
00033 
00034   int oldtype = LIBC_CANCEL_ASYNC ();
00035 
00036   pid_t result = INLINE_SYSCALL (wait4, 4, WAIT_ANY, stat_loc, 0,
00037                              (struct rusage *) NULL);
00038 
00039   LIBC_CANCEL_RESET (oldtype);
00040 
00041   return result;
00042 }
00043 
00044 weak_alias (__libc_wait, __wait)
00045 weak_alias (__libc_wait, wait)