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