120 lines
2.3 KiB
C
120 lines
2.3 KiB
C
/* time - time a command Authors: Andy Tanenbaum & Michiel Huisjes */
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#include <sys/types.h>
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#include <sys/times.h>
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#include <limits.h>
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#include <time.h>
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#include <signal.h>
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#define HZ CLOCKS_PER_SEC
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char **args;
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char *name;
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int digit_seen;
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char a[] = " . \n";
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main(argc, argv)
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int argc;
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char *argv[];
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{
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struct tms pre_buf, post_buf;
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int status, pid;
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long start_time, end_time;
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if (argc == 1) exit(0);
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args = &argv[1];
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name = argv[1];
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/* Get real time at start of run. */
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(void) time(&start_time);
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/* Fork off child. */
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if ((pid = fork()) < 0) {
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std_err("Cannot fork\n");
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exit(1);
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}
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if (pid == 0) execute();
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/* Parent is the time program. Disable interrupts and wait. */
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signal(SIGINT, SIG_IGN);
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signal(SIGQUIT, SIG_IGN);
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do {
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times(&pre_buf);
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} while (wait(&status) != pid);
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(void) time(&end_time);
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if ((status & 0377) != 0) std_err("Command terminated abnormally.\n");
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times(&post_buf);
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/* Print results. */
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print_time("real ", (end_time - start_time) * HZ);
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print_time("user ", post_buf.tms_cutime - pre_buf.tms_cutime);
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print_time("sys ", post_buf.tms_cstime - pre_buf.tms_cstime);
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exit(status >> 8);
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}
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print_time(mess, t)
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char *mess;
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register long t;
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{
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/* Print the time 't' in hours: minutes: seconds. 't' is in ticks. */
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int hours, minutes, seconds, hundredths, i;
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digit_seen = 0;
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for (i = 0; i < 8; i++) a[i] = ' ';
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hours = (int) (t / (3600L * (long) HZ));
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t -= (long) hours * 3600L * (long) HZ;
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minutes = (int) (t / (60L * (long) HZ));
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t -= (long) minutes * 60L * (long) HZ;
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seconds = (int) (t / (long) HZ);
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t -= (long) seconds * (long) HZ;
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hundredths = (int) (t * 100L / (long) HZ);
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std_err(mess);
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if (hours) {
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twin(hours, &a[0]);
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a[2] = ':';
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}
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if (minutes || digit_seen) {
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twin(minutes, &a[3]);
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a[5] = ':';
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}
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if (seconds || digit_seen)
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twin(seconds, &a[6]);
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else
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a[7] = '0';
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a[9] = hundredths / 10 + '0';
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a[10] = hundredths % 10 + '0';
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#ifndef HUNDREDTHS /* tenths used to be enough */
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a[10] = '\n'; a[11] = 0;
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#endif
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std_err(a);
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}
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twin(n, p)
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int n;
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char *p;
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{
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char c1, c2;
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c1 = (n / 10) + '0';
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c2 = (n % 10) + '0';
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if (digit_seen == 0 && c1 == '0') c1 = ' ';
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*p++ = c1;
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*p++ = c2;
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if (n > 0) digit_seen = 1;
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}
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execute()
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{
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execvp(name, args);
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std_err("Cannot execute ");
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std_err(name);
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std_err("\n");
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exit(-1);
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}
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