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annotate toys/posix/time.c @ 1239:9a13e6637d7b draft

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Decided not to go with the sflate implementation of deflate/inflate. The decompression side's already reimplemented in compress, and I'm working on compression side.
author Rob Landley <rob@landley.net>
date Wed, 02 Apr 2014 06:37:14 -0500
parents 144d5ba7d410
children 85f297591693
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8e3b60814ad7 Add time command (that only does posix mode).
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1 /* time.c - time a simple command
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2 *
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3 * Copyright 2013 Rob Landley <rob@landley.net>
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4 *
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5 * See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/time.html
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6
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7 USE_TIME(NEWTOY(time, "<1^p", TOYFLAG_USR|TOYFLAG_BIN))
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8
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9 config TIME
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10 bool "time"
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11 default y
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12 help
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13 usage: time [-p] COMMAND [ARGS...]
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14
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15 Run command line and report real, user, and system time elapsed in seconds.
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16 (real = clock on the wall, user = cpu used by command's code,
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17 system = cpu used by OS on behalf of command.)
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18
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19 -p posix mode (ignored)
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20 */
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21
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22 #include "toys.h"
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23
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24 void time_main(void)
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25 {
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26 pid_t pid;
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27 struct timeval tv, tv2;
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28
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29 gettimeofday(&tv, NULL);
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30 if (!(pid = fork())) xexec_optargs(0);
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31 else {
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32 int stat;
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33 struct rusage ru;
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34 float r, u, s;
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35
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36 wait4(pid, &stat, 0, &ru);
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37 gettimeofday(&tv2, NULL);
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38 if (tv.tv_usec > tv2.tv_usec) {
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39 tv2.tv_usec += 1000000;
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40 tv2.tv_sec--;
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41 }
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42 r = (tv2.tv_sec-tv.tv_sec)+((tv2.tv_usec-tv.tv_usec)/1000000.0);
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43 u = ru.ru_utime.tv_sec+(ru.ru_utime.tv_usec/1000000.0);
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44 s = ru.ru_stime.tv_sec+(ru.ru_stime.tv_usec/1000000.0);
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45 fprintf(stderr, "real %f\nuser %f\nsys %f\n", r, u, s);
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46 toys.exitval = WIFEXITED(stat) ? WEXITSTATUS(stat) : WTERMSIG(stat);
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47 }
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48 }