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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", TOYFLAG_USR|TOYFLAG_BIN|TOYFLAG_MAYFORK))
config TIME
bool "time"
default y
depends on TOYBOX_FLOAT
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 (default)
-v Verbose
*/
#define FOR_time
#include "toys.h"
void time_main(void)
{
pid_t pid;
struct timeval tv, tv2;
gettimeofday(&tv, NULL);
if (!(pid = XVFORK())) xexec(toys.optargs);
else {
int stat;
struct rusage ru;
float r, u, s;
wait4(pid, &stat, 0, &ru);
gettimeofday(&tv2, NULL);
if (tv.tv_usec > tv2.tv_usec) {
tv2.tv_usec += 1000000;
tv2.tv_sec--;
}
r = (tv2.tv_sec-tv.tv_sec)+((tv2.tv_usec-tv.tv_usec)/1000000.0);
u = ru.ru_utime.tv_sec+(ru.ru_utime.tv_usec/1000000.0);
s = ru.ru_stime.tv_sec+(ru.ru_stime.tv_usec/1000000.0);
if (FLAG(v)) fprintf(stderr, "Real time (s): %f\nSystem time (s): %f\n"
"User time (s): %f\nMax 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",
r, s, u, ru.ru_maxrss, ru.ru_majflt, ru.ru_minflt, ru.ru_inblock,
ru.ru_oublock, ru.ru_nvcsw, ru.ru_nivcsw);
else fprintf(stderr, "real %f\nuser %f\nsys %f\n", r, u, s);
toys.exitval = WIFEXITED(stat) ? WEXITSTATUS(stat) : WTERMSIG(stat);
}
}
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