61 lines
1.9 KiB
C
61 lines
1.9 KiB
C
/* time.c - time a simple command
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*
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* Copyright 2013 Rob Landley <rob@landley.net>
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*
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* See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/time.html
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USE_TIME(NEWTOY(time, "<1^pv[-pv]", TOYFLAG_USR|TOYFLAG_BIN|TOYFLAG_MAYFORK))
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config TIME
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bool "time"
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default y
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help
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usage: time [-pv] COMMAND...
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Run command line and report real, user, and system time elapsed in seconds.
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(real = clock on the wall, user = cpu used by command's code,
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system = cpu used by OS on behalf of command.)
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-p POSIX format output
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-v Verbose
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*/
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#define FOR_time
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#include "toys.h"
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void time_main(void)
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{
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struct timespec ts, ts2;
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struct rusage ru;
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long long sec[3];
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int stat, ii, idx, nano[3];
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pid_t pid;
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char *labels[] = {"\nreal"+!!FLAG(p), "user", "sys"}, **label = labels,
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*vlabels[] ={"Real", "User", "System"}, tab = toys.optflags ? ' ' : '\t';
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if (FLAG(v)) label = vlabels;
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clock_gettime(CLOCK_MONOTONIC, &ts);
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if (!(pid = XVFORK())) xexec(toys.optargs);
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wait4(pid, &stat, 0, &ru);
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clock_gettime(CLOCK_MONOTONIC, &ts2);
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sec[0] = nanodiff(&ts, &ts2);
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nano[0] = (sec[0] % 1000000000)/(toys.optflags ? 1000 : 1000000);
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sec[0] /= 1000000000;
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sec[1] = ru.ru_utime.tv_sec, nano[1] = ru.ru_utime.tv_usec;
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sec[2] = ru.ru_stime.tv_sec, nano[2] = ru.ru_stime.tv_usec;
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for (ii = idx = 0; ii<3; ii++)
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idx += sprintf(toybuf+idx, "%s%s%c%lld.%0*d\n", label[ii],
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FLAG(v) ? " time (s):" : "", tab, sec[ii],
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6>>!toys.optflags, nano[ii]);
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if (FLAG(v)) idx += sprintf(toybuf+idx,
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"Max RSS (KiB): %ld\nMajor faults: %ld\n"
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"Minor faults: %ld\nFile system inputs: %ld\nFile system outputs: %ld\n"
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"Voluntary context switches: %ld\nInvoluntary context switches: %ld\n",
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ru.ru_maxrss, ru.ru_majflt, ru.ru_minflt, ru.ru_inblock,
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ru.ru_oublock, ru.ru_nvcsw, ru.ru_nivcsw);
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writeall(2, toybuf, idx);
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toys.exitval = WIFEXITED(stat) ? WEXITSTATUS(stat) : WTERMSIG(stat);
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}
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