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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 = fork())) 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);
+ fprintf(stderr, "real %f\nuser %f\nsys %f\n", r, u, s);
+ toys.exitval = WIFEXITED(stat) ? WEXITSTATUS(stat) : WTERMSIG(stat);
+ }
+}