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/* $NetBSD: time.c,v 1.9 1997/10/20 03:28:21 lukem 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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 <errno.h>
#include <err.h>
#include <inttypes.h>
#include <langinfo.h>
#include <libproc.h>
#include <locale.h>
#include <sys/cdefs.h>
#include <sysexits.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/wait.h>
#include <signal.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
int lflag;
int portableflag;
bool child_running = true;
void
child_handler(int sig)
{
child_running = false;
}
int
main(int argc, char **argv)
{
int pid;
int ch, status, rusage_ret = -1;
uint64_t before_ns, after_ns, duration_ns, duration_secs, duration_frac_ns;
struct rusage ru;
struct rusage_info_v4 ruinfo;
sigset_t sigmask, suspmask, origmask;
lflag = 0;
while ((ch = getopt(argc, argv, "lp")) != -1) {
switch((char)ch) {
case 'p':
portableflag = 1;
break;
case 'l':
lflag = 1;
break;
case '?':
default:
fprintf(stderr, "usage: time [-lp] <command>\n");
exit(1);
}
}
if (!(argc -= optind)) {
exit(0);
}
argv += optind;
sigemptyset(&sigmask);
/*
* Block SIGCHLD so that the check for `child_running` doesn't miss the
* handler before calling `sigsuspend` and blocking forever.
*/
sigaddset(&sigmask, SIGCHLD);
sigprocmask(SIG_BLOCK, &sigmask, &origmask);
/*
* Ensure child signals are handled by the parent prior to fork; otherwise,
* they could be missed between the child forking and calling `sigsuspend`.
*/
(void)signal(SIGCHLD, child_handler);
sigemptyset(&suspmask);
before_ns = clock_gettime_nsec_np(CLOCK_UPTIME_RAW);
/*
* NB: Don't add anything between these two lines -- measurement is
* happening now.
*/
switch (pid = vfork()) {
case -1: /* error */
err(EX_OSERR, "time");
__builtin_unreachable();
case 0: /* child */
/*
* Allow the child to respond to signals by resetting to the original
* signal handling behavior.
*/
(void)sigprocmask(SIG_SETMASK, &origmask, NULL);
execvp(*argv, argv);
perror(*argv);
_exit((errno == ENOENT) ? 127 : 126);
__builtin_unreachable();
default: /* parent */
break;
}
/*
* Let the child handle signals that normally exit.
*/
(void)signal(SIGINT, SIG_IGN);
(void)signal(SIGQUIT, SIG_IGN);
while (child_running) {
/*
* This would be racy, but SIGCHLD is blocked above (as part of
* `sigmask`.
*/
sigsuspend(&suspmask);
}
/*
* NB: Minimize what's added between these statements to preserve the
* accuracy of the time measurement.
*/
after_ns = clock_gettime_nsec_np(CLOCK_UPTIME_RAW);
if (lflag) {
rusage_ret = proc_pid_rusage(pid, RUSAGE_INFO_V4, (void **)&ruinfo);
}
while (wait3(&status, 0, &ru) != pid) {
}
if (!WIFEXITED(status)) {
fprintf(stderr, "Command terminated abnormally.\n");
}
duration_ns = after_ns - before_ns;
duration_secs = duration_ns / (1000 * 1000 * 1000);
duration_frac_ns = duration_ns - (duration_secs * 1000 * 1000 * 1000);
if (portableflag) {
char *radix = NULL;
setlocale(LC_ALL, "");
radix = nl_langinfo(RADIXCHAR);
if (!radix || radix[0] == '\0') {
radix = ".";
}
fprintf(stderr, "real %9" PRIu64 "%s%02" PRIu64 "\n",
duration_secs, radix, duration_frac_ns / (10 * 1000 * 1000));
fprintf(stderr, "user %9ld%s%02ld\n",
(long)ru.ru_utime.tv_sec, radix, (long)ru.ru_utime.tv_usec/10000);
fprintf(stderr, "sys %9ld%s%02ld\n",
(long)ru.ru_stime.tv_sec, radix, (long)ru.ru_stime.tv_usec/10000);
} else {
fprintf(stderr, "%9" PRIu64 ".%02" PRIu64 " real ",
duration_secs, duration_frac_ns / (10 * 1000 * 1000));
fprintf(stderr, "%9ld.%02ld user ",
(long)ru.ru_utime.tv_sec, (long)ru.ru_utime.tv_usec/10000);
fprintf(stderr, "%9ld.%02ld sys\n",
(long)ru.ru_stime.tv_sec, (long)ru.ru_stime.tv_usec/10000);
}
if (lflag) {
int hz = 100; /* XXX */
long ticks;
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, "%20ld %s\n",
ru.ru_maxrss, "maximum resident set size");
fprintf(stderr, "%20ld %s\n", ticks ? ru.ru_ixrss / ticks : 0,
"average shared memory size");
fprintf(stderr, "%20ld %s\n", ticks ? ru.ru_idrss / ticks : 0,
"average unshared data size");
fprintf(stderr, "%20ld %s\n", ticks ? ru.ru_isrss / ticks : 0,
"average unshared stack size");
fprintf(stderr, "%20ld %s\n",
ru.ru_minflt, "page reclaims");
fprintf(stderr, "%20ld %s\n",
ru.ru_majflt, "page faults");
fprintf(stderr, "%20ld %s\n",
ru.ru_nswap, "swaps");
fprintf(stderr, "%20ld %s\n",
ru.ru_inblock, "block input operations");
fprintf(stderr, "%20ld %s\n",
ru.ru_oublock, "block output operations");
fprintf(stderr, "%20ld %s\n",
ru.ru_msgsnd, "messages sent");
fprintf(stderr, "%20ld %s\n",
ru.ru_msgrcv, "messages received");
fprintf(stderr, "%20ld %s\n",
ru.ru_nsignals, "signals received");
fprintf(stderr, "%20ld %s\n",
ru.ru_nvcsw, "voluntary context switches");
fprintf(stderr, "%20ld %s\n",
ru.ru_nivcsw, "involuntary context switches");
if (rusage_ret >= 0) {
if (ruinfo.ri_instructions > 0) {
fprintf(stderr, "%20" PRIu64 " %s\n", ruinfo.ri_instructions,
"instructions retired");
}
if (ruinfo.ri_cycles > 0) {
fprintf(stderr, "%20" PRIu64 " %s\n", ruinfo.ri_cycles,
"cycles elapsed");
}
if (ruinfo.ri_lifetime_max_phys_footprint > 0) {
fprintf(stderr, "%20" PRIu64 " %s\n",
ruinfo.ri_lifetime_max_phys_footprint,
"peak memory footprint");
}
}
}
exit(WIFEXITED(status) ? WEXITSTATUS(status) : EXIT_FAILURE);
}
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