usr/src/usr.bin/time/time.c

/*
 * Copyright (c) 1987, 1988 The Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 */

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1987, 1988 The Regents of the University of California.\n\
 All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)time.c      4.9 (Berkeley) %G%";
#endif /* not lint */

#include <sys/types.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/signal.h>
#include <stdio.h>

main(argc, argv)
        int argc;
        char **argv;
{
        extern int optind;
        register int pid;
        int ch, status, lflag;
        struct timeval before, after;
        struct rusage ru;

        lflag = 0;
        while ((ch = getopt(argc, argv, "l")) != EOF)
                switch((char)ch) {
                case 'l':
                        lflag = 1;
                        break;
                case '?':
                default:
                        fprintf(stderr, "usage: time [-l] command.\n");
                        exit(1);
                }

        if (!(argc -= optind))
                exit(0);
        argv += optind;

        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(1);
                /* NOTREACHED */
        }
        /* parent */
        (void)signal(SIGINT, SIG_IGN);
        (void)signal(SIGQUIT, SIG_IGN);
        while (wait3(&status, 0, &ru) != pid);          /* XXX use waitpid */
        gettimeofday(&after, (struct timezone *)NULL);
        if (status&0377)
                fprintf(stderr, "Command terminated abnormally.\n");
        after.tv_sec -= before.tv_sec;
        after.tv_usec -= before.tv_usec;
        if (after.tv_usec < 0)
                after.tv_sec--, after.tv_usec += 1000000;
        fprintf(stderr, "%9ld.%02ld real ", after.tv_sec, after.tv_usec/10000);
        fprintf(stderr, "%9ld.%02ld user ",
            ru.ru_utime.tv_sec, ru.ru_utime.tv_usec/10000);
        fprintf(stderr, "%9ld.%02ld sys\n",
            ru.ru_stime.tv_sec, 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, "%10ld  %s\n",
                        ru.ru_maxrss, "maximum resident set size");
                fprintf(stderr, "%10ld  %s\n",
                        ru.ru_ixrss / ticks, "average shared memory size");
                fprintf(stderr, "%10ld  %s\n",
                        ru.ru_idrss / ticks, "average unshared data size");
                fprintf(stderr, "%10ld  %s\n",
                        ru.ru_isrss / ticks, "average unshared stack size");
                fprintf(stderr, "%10ld  %s\n",
                        ru.ru_minflt, "page reclaims");
                fprintf(stderr, "%10ld  %s\n",
                        ru.ru_majflt, "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");
        }
        exit (status>>8);
}