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annotate toys/posix/time.c @ 1746:b11f536bac74 draft

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install -D bugfix from David Halls. (I tweaked some comment text while I was there.)
author Rob Landley <rob@landley.net>
date Sat, 21 Mar 2015 15:49:38 -0500
parents 0d9bad339158
children
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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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0d9bad339158 The time command depends on floating point support.
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12 depends on TOYBOX_FLOAT
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13 help
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14 usage: time [-p] COMMAND [ARGS...]
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15
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16 Run command line and report real, user, and system time elapsed in seconds.
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17 (real = clock on the wall, user = cpu used by command's code,
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18 system = cpu used by OS on behalf of command.)
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19
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20 -p posix mode (ignored)
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21 */
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22
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23 #include "toys.h"
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24
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25 void time_main(void)
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26 {
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27 pid_t pid;
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28 struct timeval tv, tv2;
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29
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30 gettimeofday(&tv, NULL);
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cbb1aca81eca Make toy_exec() check if argc is in optargs and deal with it there so we don't need a separate xexec_optargs().
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31 if (!(pid = xfork())) xexec(toys.optargs);
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32 else {
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33 int stat;
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34 struct rusage ru;
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35 float r, u, s;
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36
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37 wait4(pid, &stat, 0, &ru);
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38 gettimeofday(&tv2, NULL);
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39 if (tv.tv_usec > tv2.tv_usec) {
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40 tv2.tv_usec += 1000000;
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41 tv2.tv_sec--;
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42 }
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43 r = (tv2.tv_sec-tv.tv_sec)+((tv2.tv_usec-tv.tv_usec)/1000000.0);
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44 u = ru.ru_utime.tv_sec+(ru.ru_utime.tv_usec/1000000.0);
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45 s = ru.ru_stime.tv_sec+(ru.ru_stime.tv_usec/1000000.0);
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46 fprintf(stderr, "real %f\nuser %f\nsys %f\n", r, u, s);
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47 toys.exitval = WIFEXITED(stat) ? WEXITSTATUS(stat) : WTERMSIG(stat);
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48 }
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49 }