/usr.bin/time/time.c
https://bitbucket.org/freebsd/freebsd-head/ · C · 303 lines · 231 code · 26 blank · 46 comment · 32 complexity · ca6de1622f94d4a8581d2996e0207acd MD5 · raw file
- /*
- * 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.
- * 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.
- */
- #ifndef lint
- static const char copyright[] =
- "@(#) Copyright (c) 1987, 1988, 1993\n\
- The Regents of the University of California. All rights reserved.\n";
- #endif /* not lint */
- #ifndef lint
- #if 0
- static char sccsid[] = "@(#)time.c 8.1 (Berkeley) 6/6/93";
- #endif
- static const char rcsid[] =
- "$FreeBSD$";
- #endif /* not lint */
- #include <sys/types.h>
- #include <sys/resource.h>
- #include <sys/signal.h>
- #include <sys/sysctl.h>
- #include <sys/time.h>
- #include <sys/wait.h>
- #include <err.h>
- #include <errno.h>
- #include <locale.h>
- #include <signal.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <stdint.h>
- #include <string.h>
- #include <unistd.h>
- static int getstathz(void);
- static void humantime(FILE *, long, long);
- static void showtime(FILE *, struct timeval *, struct timeval *,
- struct rusage *);
- static void siginfo(int);
- static void usage(void);
- static char decimal_point;
- static struct timeval before_tv;
- static int hflag, pflag;
- int
- main(int argc, char **argv)
- {
- int aflag, ch, lflag, status;
- int exitonsig;
- pid_t pid;
- struct rlimit rl;
- struct rusage ru;
- struct timeval after;
- char *ofn = NULL;
- FILE *out = stderr;
- (void) setlocale(LC_NUMERIC, "");
- decimal_point = localeconv()->decimal_point[0];
- aflag = hflag = lflag = pflag = 0;
- while ((ch = getopt(argc, argv, "ahlo:p")) != -1)
- switch((char)ch) {
- case 'a':
- aflag = 1;
- break;
- case 'h':
- hflag = 1;
- break;
- case 'l':
- lflag = 1;
- break;
- case 'o':
- ofn = optarg;
- break;
- case 'p':
- pflag = 1;
- break;
- case '?':
- default:
- usage();
- }
- if (!(argc -= optind))
- exit(0);
- argv += optind;
- if (ofn) {
- if ((out = fopen(ofn, aflag ? "a" : "w")) == NULL)
- err(1, "%s", ofn);
- setvbuf(out, (char *)NULL, _IONBF, (size_t)0);
- }
- (void)gettimeofday(&before_tv, NULL);
- switch(pid = fork()) {
- case -1: /* error */
- err(1, "time");
- /* NOTREACHED */
- case 0: /* child */
- if (ofn)
- fclose(out);
- execvp(*argv, argv);
- err(errno == ENOENT ? 127 : 126, "%s", *argv);
- /* NOTREACHED */
- }
- /* parent */
- (void)signal(SIGINT, SIG_IGN);
- (void)signal(SIGQUIT, SIG_IGN);
- (void)signal(SIGINFO, siginfo);
- while (wait4(pid, &status, 0, &ru) != pid);
- (void)gettimeofday(&after, NULL);
- if ( ! WIFEXITED(status))
- warnx("command terminated abnormally");
- exitonsig = WIFSIGNALED(status) ? WTERMSIG(status) : 0;
- showtime(out, &before_tv, &after, &ru);
- if (lflag) {
- int hz = getstathz();
- u_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;
- /*
- * If our round-off on the tick calculation still puts us at 0,
- * then always assume at least one tick.
- */
- if (ticks == 0)
- ticks = 1;
- fprintf(out, "%10ld %s\n",
- ru.ru_maxrss, "maximum resident set size");
- fprintf(out, "%10ld %s\n",
- ru.ru_ixrss / ticks, "average shared memory size");
- fprintf(out, "%10ld %s\n",
- ru.ru_idrss / ticks, "average unshared data size");
- fprintf(out, "%10ld %s\n",
- ru.ru_isrss / ticks, "average unshared stack size");
- fprintf(out, "%10ld %s\n",
- ru.ru_minflt, "page reclaims");
- fprintf(out, "%10ld %s\n",
- ru.ru_majflt, "page faults");
- fprintf(out, "%10ld %s\n",
- ru.ru_nswap, "swaps");
- fprintf(out, "%10ld %s\n",
- ru.ru_inblock, "block input operations");
- fprintf(out, "%10ld %s\n",
- ru.ru_oublock, "block output operations");
- fprintf(out, "%10ld %s\n",
- ru.ru_msgsnd, "messages sent");
- fprintf(out, "%10ld %s\n",
- ru.ru_msgrcv, "messages received");
- fprintf(out, "%10ld %s\n",
- ru.ru_nsignals, "signals received");
- fprintf(out, "%10ld %s\n",
- ru.ru_nvcsw, "voluntary context switches");
- fprintf(out, "%10ld %s\n",
- ru.ru_nivcsw, "involuntary context switches");
- }
- /*
- * If the child has exited on a signal, exit on the same
- * signal, too, in order to reproduce the child's exit status.
- * However, avoid actually dumping core from the current process.
- */
- if (exitonsig) {
- if (signal(exitonsig, SIG_DFL) == SIG_ERR)
- warn("signal");
- else {
- rl.rlim_max = rl.rlim_cur = 0;
- if (setrlimit(RLIMIT_CORE, &rl) == -1)
- warn("setrlimit");
- kill(getpid(), exitonsig);
- }
- }
- exit (WIFEXITED(status) ? WEXITSTATUS(status) : EXIT_FAILURE);
- }
- static void
- usage(void)
- {
- fprintf(stderr,
- "usage: time [-al] [-h | -p] [-o file] utility [argument ...]\n");
- exit(1);
- }
- /*
- * Return the frequency of the kernel's statistics clock.
- */
- static int
- getstathz(void)
- {
- int mib[2];
- size_t size;
- struct clockinfo clockrate;
- mib[0] = CTL_KERN;
- mib[1] = KERN_CLOCKRATE;
- size = sizeof clockrate;
- if (sysctl(mib, 2, &clockrate, &size, NULL, 0) == -1)
- err(1, "sysctl kern.clockrate");
- return clockrate.stathz;
- }
- static void
- humantime(FILE *out, long sec, long usec)
- {
- long days, hrs, mins;
- days = sec / (60L * 60 * 24);
- sec %= (60L * 60 * 24);
- hrs = sec / (60L * 60);
- sec %= (60L * 60);
- mins = sec / 60;
- sec %= 60;
- fprintf(out, "\t");
- if (days)
- fprintf(out, "%ldd", days);
- if (hrs)
- fprintf(out, "%ldh", hrs);
- if (mins)
- fprintf(out, "%ldm", mins);
- fprintf(out, "%ld%c%02lds", sec, decimal_point, usec);
- }
- static void
- showtime(FILE *out, struct timeval *before, struct timeval *after,
- struct rusage *ru)
- {
- after->tv_sec -= before->tv_sec;
- after->tv_usec -= before->tv_usec;
- if (after->tv_usec < 0)
- after->tv_sec--, after->tv_usec += 1000000;
- if (pflag) {
- /* POSIX wants output that must look like
- "real %f\nuser %f\nsys %f\n" and requires
- at least two digits after the radix. */
- fprintf(out, "real %jd%c%02ld\n",
- (intmax_t)after->tv_sec, decimal_point,
- after->tv_usec/10000);
- fprintf(out, "user %jd%c%02ld\n",
- (intmax_t)ru->ru_utime.tv_sec, decimal_point,
- ru->ru_utime.tv_usec/10000);
- fprintf(out, "sys %jd%c%02ld\n",
- (intmax_t)ru->ru_stime.tv_sec, decimal_point,
- ru->ru_stime.tv_usec/10000);
- } else if (hflag) {
- humantime(out, after->tv_sec, after->tv_usec/10000);
- fprintf(out, " real\t");
- humantime(out, ru->ru_utime.tv_sec, ru->ru_utime.tv_usec/10000);
- fprintf(out, " user\t");
- humantime(out, ru->ru_stime.tv_sec, ru->ru_stime.tv_usec/10000);
- fprintf(out, " sys\n");
- } else {
- fprintf(out, "%9jd%c%02ld real ",
- (intmax_t)after->tv_sec, decimal_point,
- after->tv_usec/10000);
- fprintf(out, "%9jd%c%02ld user ",
- (intmax_t)ru->ru_utime.tv_sec, decimal_point,
- ru->ru_utime.tv_usec/10000);
- fprintf(out, "%9jd%c%02ld sys\n",
- (intmax_t)ru->ru_stime.tv_sec, decimal_point,
- ru->ru_stime.tv_usec/10000);
- }
- }
- static void
- siginfo(int sig __unused)
- {
- struct timeval after;
- struct rusage ru;
- (void)gettimeofday(&after, NULL);
- getrusage(RUSAGE_CHILDREN, &ru);
- showtime(stdout, &before_tv, &after, &ru);
- }