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^pv", TOYFLAG_USR|TOYFLAG_BIN)) 8 9 config TIME 10 bool "time" 11 default y 12 depends on TOYBOX_FLOAT 13 help 14 usage: time [-pv] 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 (default) 21 -v verbose mode 22 */ 23 24 #define FOR_time 25 #include "toys.h" 26 27 void time_main(void) 28 { 29 pid_t pid; 30 struct timeval tv, tv2; 31 32 gettimeofday(&tv, NULL); 33 if (!(pid = XVFORK())) xexec(toys.optargs); 34 else { 35 int stat; 36 struct rusage ru; 37 float r, u, s; 38 39 wait4(pid, &stat, 0, &ru); 40 gettimeofday(&tv2, NULL); 41 if (tv.tv_usec > tv2.tv_usec) { 42 tv2.tv_usec += 1000000; 43 tv2.tv_sec--; 44 } 45 r = (tv2.tv_sec-tv.tv_sec)+((tv2.tv_usec-tv.tv_usec)/1000000.0); 46 u = ru.ru_utime.tv_sec+(ru.ru_utime.tv_usec/1000000.0); 47 s = ru.ru_stime.tv_sec+(ru.ru_stime.tv_usec/1000000.0); 48 if (toys.optflags&FLAG_v) { 49 fprintf(stderr, "Real time (s): %f\n" 50 "System time (s): %f\n" 51 "User time (s): %f\n" 52 "Max RSS (KiB): %ld\n" 53 "Major faults: %ld\n" 54 "Minor faults: %ld\n" 55 "File system inputs: %ld\n" 56 "File system outputs: %ld\n" 57 "Voluntary context switches: %ld\n" 58 "Involuntary context switches: %ld\n", r, u, s, 59 ru.ru_maxrss, ru.ru_majflt, ru.ru_minflt, ru.ru_inblock, 60 ru.ru_oublock, ru.ru_nvcsw, ru.ru_nivcsw); 61 } else fprintf(stderr, "real %f\nuser %f\nsys %f\n", r, u, s); 62 toys.exitval = WIFEXITED(stat) ? WEXITSTATUS(stat) : WTERMSIG(stat); 63 } 64 } 65
