/*	$OpenBSD: time.c,v 1.19 2013/04/16 23:43:00 deraadt Exp $	*/
/*	$NetBSD: time.c,v 1.7 1995/06/27 00:34:00 jtc Exp $	*/

/*
 * Copyright (c) 1987, 1988, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/param.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/wait.h>
#include <sys/sysctl.h>

#include <err.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

int lflag;
int portableflag;

__dead void usage(void);

int
main(int argc, char *argv[])
{
	pid_t pid;
	int ch, status;
	struct timeval before, after;
	struct rusage ru;
	int exitonsig = 0;


	while ((ch = getopt(argc, argv, "lp")) != -1) {
		switch(ch) {
		case 'l':
			lflag = 1;
			break;
		case 'p':
			portableflag = 1;
			break;
		default:
			usage();
			/* NOTREACHED */
		}
	}

	argc -= optind;
	argv += optind;

	if (argc < 1)
		usage();

	gettimeofday(&before, (struct timezone *)NULL);
	switch(pid = vfork()) {
	case -1:			/* error */
		perror("time");
		exit(1);
		/* NOTREACHED */
	case 0:				/* child */
		execvp(*argv, argv);
		perror(*argv);
		_exit((errno == ENOENT) ? 127 : 126);
		/* NOTREACHED */
	}

	/* parent */
	(void)signal(SIGINT, SIG_IGN);
	(void)signal(SIGQUIT, SIG_IGN);
	while (wait3(&status, 0, &ru) != pid)
		;
	gettimeofday(&after, (struct timezone *)NULL);
	if (WIFSIGNALED(status))
		exitonsig = WTERMSIG(status);
	if (!WIFEXITED(status))
		fprintf(stderr, "Command terminated abnormally.\n");
	timersub(&after, &before, &after);

	if (portableflag) {
		fprintf(stderr, "real %9lld.%02ld\n",
			(long long)after.tv_sec, after.tv_usec/10000);
		fprintf(stderr, "user %9lld.%02ld\n",
			(long long)ru.ru_utime.tv_sec, ru.ru_utime.tv_usec/10000);
		fprintf(stderr, "sys  %9lld.%02ld\n",
			(long long)ru.ru_stime.tv_sec, ru.ru_stime.tv_usec/10000);
	} else {

		fprintf(stderr, "%9lld.%02ld real ",
			(long long)after.tv_sec, after.tv_usec/10000);
		fprintf(stderr, "%9lld.%02ld user ",
			(long long)ru.ru_utime.tv_sec, ru.ru_utime.tv_usec/10000);
		fprintf(stderr, "%9lld.%02ld sys\n",
			(long long)ru.ru_stime.tv_sec, ru.ru_stime.tv_usec/10000);
	}

	if (lflag) {
		int hz;
		long ticks;
		int mib[2];
		struct clockinfo clkinfo;
		size_t size;

		mib[0] = CTL_KERN;
		mib[1] = KERN_CLOCKRATE;
		size = sizeof(clkinfo);
		if (sysctl(mib, 2, &clkinfo, &size, NULL, 0) < 0)
			err(1, "sysctl");

		hz = clkinfo.hz;

		ticks = hz * (ru.ru_utime.tv_sec + ru.ru_stime.tv_sec) +
		     hz * (ru.ru_utime.tv_usec + ru.ru_stime.tv_usec) / 1000000;

		fprintf(stderr, "%10ld  %s\n",
			ru.ru_maxrss, "maximum resident set size");
		fprintf(stderr, "%10ld  %s\n", ticks ? ru.ru_ixrss / ticks : 0,
			"average shared memory size");
		fprintf(stderr, "%10ld  %s\n", ticks ? ru.ru_idrss / ticks : 0,
			"average unshared data size");
		fprintf(stderr, "%10ld  %s\n", ticks ? ru.ru_isrss / ticks : 0,
			"average unshared stack size");
		fprintf(stderr, "%10ld  %s\n",
			ru.ru_minflt, "minor page faults");
		fprintf(stderr, "%10ld  %s\n",
			ru.ru_majflt, "major page faults");
		fprintf(stderr, "%10ld  %s\n",
			ru.ru_nswap, "swaps");
		fprintf(stderr, "%10ld  %s\n",
			ru.ru_inblock, "block input operations");
		fprintf(stderr, "%10ld  %s\n",
			ru.ru_oublock, "block output operations");
		fprintf(stderr, "%10ld  %s\n",
			ru.ru_msgsnd, "messages sent");
		fprintf(stderr, "%10ld  %s\n",
			ru.ru_msgrcv, "messages received");
		fprintf(stderr, "%10ld  %s\n",
			ru.ru_nsignals, "signals received");
		fprintf(stderr, "%10ld  %s\n",
			ru.ru_nvcsw, "voluntary context switches");
		fprintf(stderr, "%10ld  %s\n",
			ru.ru_nivcsw, "involuntary context switches");
	}

	if (exitonsig) {
		if (signal(exitonsig, SIG_DFL) == SIG_ERR)
			perror("signal");
		else
			kill(getpid(), exitonsig);
	}
	exit(WIFEXITED(status) ? WEXITSTATUS(status) : EXIT_FAILURE);
}

__dead void
usage(void)
{
	extern char *__progname;

	(void)fprintf(stderr, "usage: %s [-lp] utility [argument ...]\n",
	    __progname);
	exit(1);
}