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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*
* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T
* All Rights Reserved
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include "synonyms.h"
/*
* Compatibility lib for SunOS's wait4().
*/
#include <sys/types.h>
#include <sys/time.h>
#include <sys/times.h>
#include <wait.h>
#include <sys/siginfo.h>
#include <sys/procset.h>
#include <sys/param.h>
#include <sys/resource.h>
#include <string.h>
#include <errno.h>
/*
* Since sysV does not support rusage as in BSD, an approximate approach
* is:
* ...
* call times
* call waitid
* if ( a child is found )
* call times again
* rusage ~= diff in the 2 times call
* ...
*/
static int wstat(int, int);
pid_t
wait4(pid_t pid, int *status, int options, struct rusage *rp)
{
struct tms before_tms;
struct tms after_tms;
siginfo_t info;
int error;
int noptions;
idtype_t idtype;
if (rp)
(void) memset(rp, 0, sizeof (struct rusage));
(void) memset(&info, 0, sizeof (siginfo_t));
if (times(&before_tms) == (clock_t)-1)
return (-1); /* errno is set by times() */
/*
* SunOS's wait4() previously supported only WNOHANG &
* WUNTRACED. XPG4v2 mandates that wait3() (which calls
* wait4()) also support WCONTINUED.
*/
if (options & ~(WNOHANG|WUNTRACED|WCONTINUED)) {
errno = EINVAL;
return (-1);
}
noptions = options | WEXITED | WTRAPPED;
/*
* Emulate undocumented 4.x semantics for 1186845
*/
if (pid < 0) {
pid = -pid;
idtype = P_PGID;
} else if (pid == 0)
idtype = P_ALL;
else
idtype = P_PID;
error = waitid(idtype, pid, &info, noptions);
if (error == 0) {
clock_t diffu; /* difference in usertime (ticks) */
clock_t diffs; /* difference in systemtime (ticks) */
clock_t hz;
if ((options & WNOHANG) && (info.si_pid == 0))
return (0); /* no child found */
if (rp) {
if (times(&after_tms) == (clock_t)-1)
return (-1); /* errno set by times() */
/*
* The system/user time is an approximation only !!!
*/
diffu = after_tms.tms_cutime - before_tms.tms_cutime;
diffs = after_tms.tms_cstime - before_tms.tms_cstime;
hz = CLK_TCK;
rp->ru_utime.tv_sec = diffu / hz;
rp->ru_utime.tv_usec = (diffu % hz) * (1000000 / hz);
rp->ru_stime.tv_sec = diffs / hz;
rp->ru_stime.tv_usec = (diffs % hz) * (1000000 / hz);
}
if (status)
*status = wstat(info.si_code, info.si_status);
return (info.si_pid);
} else {
return (-1); /* error number is set by waitid() */
}
}
/*
* Convert the status code to old style wait status
*/
static int
wstat(int code, int status)
{
int stat = (status & 0377);
switch (code) {
case CLD_EXITED:
stat <<= 8;
break;
case CLD_DUMPED:
stat |= WCOREFLG;
break;
case CLD_KILLED:
break;
case CLD_TRAPPED:
case CLD_STOPPED:
stat <<= 8;
stat |= WSTOPFLG;
break;
case CLD_CONTINUED:
stat = WCONTFLG;
break;
}
return (stat);
}
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