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glibc  2.9
waitpid.c
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00001 /* Copyright (C) 1991,95,96,97,2000,02 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 <errno.h>
00020 #include <stddef.h>
00021 #include <sys/wait.h>
00022 #include <sys/types.h>
00023 
00024 extern pid_t kwaitpid (int *stat_loc, pid_t pid, int options,
00025                      struct rusage *ru_loc, siginfo_t *infop);
00026 
00027 
00028 /* Wait for a child matching PID to die.
00029    If PID is greater than 0, match any process whose process ID is PID.
00030    If PID is (pid_t) -1, match any process.
00031    If PID is (pid_t) 0, match any process with the
00032    same process group as the current process.
00033    If PID is less than -1, match any process whose
00034    process group is the absolute value of PID.
00035    If the WNOHANG bit is set in OPTIONS, and that child
00036    is not already dead, return (pid_t) 0.  If successful,
00037    return PID and store the dead child's status in STAT_LOC.
00038    Return (pid_t) -1 for errors.  If the WUNTRACED bit is set in OPTIONS,
00039    return status for stopped children; otherwise don't.  */
00040 pid_t
00041 __libc_waitpid (pid_t pid, int *stat_loc, int options)
00042 {
00043   if ((options & ~(WNOHANG|WUNTRACED)) != 0)
00044     {
00045       __set_errno (EINVAL);
00046       return (pid_t) -1;
00047     }
00048 
00049   return kwaitpid (stat_loc, pid, options, NULL, NULL);
00050 }
00051 weak_alias (__libc_waitpid, __waitpid)
00052 libc_hidden_weak (__waitpid)
00053 weak_alias (__libc_waitpid, waitpid)