1 /* time.c - time a simple command 2 * 3 * Copyright 2013 Rob Landley <rob (at) landley.net> 4 * 5 * See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/time.html 6 7 USE_TIME(NEWTOY(time, "<1^p", TOYFLAG_USR|TOYFLAG_BIN)) 8 9 config TIME 10 bool "time" 11 default y 12 depends on TOYBOX_FLOAT 13 help 14 usage: time [-p] COMMAND [ARGS...] 15 16 Run command line and report real, user, and system time elapsed in seconds. 17 (real = clock on the wall, user = cpu used by command's code, 18 system = cpu used by OS on behalf of command.) 19 20 -p posix mode (ignored) 21 */ 22 23 #include "toys.h" 24 25 void time_main(void) 26 { 27 pid_t pid; 28 struct timeval tv, tv2; 29 30 gettimeofday(&tv, NULL); 31 if (!(pid = XVFORK())) xexec(toys.optargs); 32 else { 33 int stat; 34 struct rusage ru; 35 float r, u, s; 36 37 wait4(pid, &stat, 0, &ru); 38 gettimeofday(&tv2, NULL); 39 if (tv.tv_usec > tv2.tv_usec) { 40 tv2.tv_usec += 1000000; 41 tv2.tv_sec--; 42 } 43 r = (tv2.tv_sec-tv.tv_sec)+((tv2.tv_usec-tv.tv_usec)/1000000.0); 44 u = ru.ru_utime.tv_sec+(ru.ru_utime.tv_usec/1000000.0); 45 s = ru.ru_stime.tv_sec+(ru.ru_stime.tv_usec/1000000.0); 46 fprintf(stderr, "real %f\nuser %f\nsys %f\n", r, u, s); 47 toys.exitval = WIFEXITED(stat) ? WEXITSTATUS(stat) : WTERMSIG(stat); 48 } 49 } 50
