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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^p", TOYFLAG_USR|TOYFLAG_BIN))
config TIME
bool "time"
default y
help
usage: time [-p] COMMAND [ARGS...]
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 mode (ignored)
*/
#include "toys.h"
void time_main(void)
{
pid_t pid;
struct timeval tv, tv2;
gettimeofday(&tv, NULL);
if (!(pid = xfork())) xexec_optargs(0);
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);
fprintf(stderr, "real %f\nuser %f\nsys %f\n", r, u, s);
toys.exitval = WIFEXITED(stat) ? WEXITSTATUS(stat) : WTERMSIG(stat);
}
}
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