mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-10 13:20:06 +00:00
36e28152c9
through unexpand.
121 lines
3.6 KiB
C
121 lines
3.6 KiB
C
/* Copyright (C) 1993, 1994, 1995, 1996, 1997 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Brendan Kehoe (brendan@zen.org).
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Library General Public License as
|
|
published by the Free Software Foundation; either version 2 of the
|
|
License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
License along with the GNU C Library; see the file COPYING.LIB. If not,
|
|
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
Boston, MA 02111-1307, USA. */
|
|
|
|
#include <errno.h>
|
|
#include <sys/wait.h>
|
|
#include <sys/types.h>
|
|
#include <stddef.h>
|
|
#include "siginfo.h"
|
|
|
|
typedef enum __idtype
|
|
{
|
|
/* Look for processes based upon a given PID. */
|
|
P_PID,
|
|
|
|
/* Look for processes based upon a given process-group ID. */
|
|
P_PGID = 2,
|
|
|
|
/* Look for any process. */
|
|
P_ALL = 7,
|
|
} __idtype_t;
|
|
|
|
extern __pid_t __getpgid __P ((__pid_t pid));
|
|
extern int __waitid __P ((__idtype_t idtype, __pid_t id,
|
|
__siginfo_t *infop, int options));
|
|
|
|
/* Wait for a child matching PID to die.
|
|
If PID is greater than 0, match any process whose process ID is PID.
|
|
If PID is (pid_t) -1, match any process.
|
|
If PID is (pid_t) 0, match any process with the
|
|
same process group as the current process.
|
|
If PID is less than -1, match any process whose
|
|
process group is the absolute value of PID.
|
|
If the WNOHANG bit is set in OPTIONS, and that child
|
|
is not already dead, return (pid_t) 0. If successful,
|
|
return PID and store the dead child's status in STAT_LOC.
|
|
Return (pid_t) -1 for errors. If the WUNTRACED bit is set in OPTIONS,
|
|
return status for stopped children; otherwise don't. */
|
|
|
|
__pid_t
|
|
__libc_waitpid (__pid_t pid, int *stat_loc, int options)
|
|
{
|
|
__idtype_t idtype;
|
|
__pid_t tmp_pid = pid;
|
|
__siginfo_t infop;
|
|
|
|
if (pid <= WAIT_MYPGRP)
|
|
{
|
|
if (pid == WAIT_ANY)
|
|
{
|
|
/* Request the status for any child. */
|
|
idtype = P_ALL;
|
|
}
|
|
else if (pid == WAIT_MYPGRP)
|
|
{
|
|
/* Request the status for any child process that has
|
|
a pgid that's equal to that of our parent. */
|
|
tmp_pid = __getpgid (0);
|
|
idtype = P_PGID;
|
|
}
|
|
else /* PID < -1 */
|
|
{
|
|
/* Request the status for any child whose pgid is equal
|
|
to the absolute value of PID. */
|
|
tmp_pid = pid & ~0; /* XXX not pseudo-insn */
|
|
idtype = P_PGID;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* Request the status for the child whose pid is PID. */
|
|
idtype = P_PID;
|
|
}
|
|
|
|
if (__waitid (idtype, tmp_pid, &infop, options | WEXITED | WTRAPPED) < 0)
|
|
return -1;
|
|
|
|
switch (infop.__code)
|
|
{
|
|
case EXITED:
|
|
*stat_loc = W_EXITCODE (infop.__status, 0);
|
|
break;
|
|
case STOPPED:
|
|
case TRAPPED:
|
|
*stat_loc = W_STOPCODE (infop.__status);
|
|
break;
|
|
case KILLED:
|
|
/* Don't know what to do with continue, since it isn't documented.
|
|
Putting it here seemed the right place though. */
|
|
case CONTINUED:
|
|
*stat_loc = infop.__status;
|
|
/* FALLTHROUGH */
|
|
case CORED:
|
|
*stat_loc |= WCOREFLAG;
|
|
break;
|
|
}
|
|
|
|
/* Return the PID out of the INFOP structure instead of the one we were
|
|
called with, to account for cases of being called with -1 to signify
|
|
any PID. */
|
|
return infop.__pid;
|
|
}
|
|
|
|
weak_alias (__libc_waitpid, __waitpid)
|
|
weak_alias (__libc_waitpid, waitpid)
|