time.c revision 120747
1/* 2 * Copyright (c) 1987, 1988, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34#ifndef lint 35static const char copyright[] = 36"@(#) Copyright (c) 1987, 1988, 1993\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38#endif /* not lint */ 39 40#ifndef lint 41#if 0 42static char sccsid[] = "@(#)time.c 8.1 (Berkeley) 6/6/93"; 43#endif 44static const char rcsid[] = 45 "$FreeBSD: head/usr.bin/time/time.c 120747 2003-10-04 15:17:08Z yar $"; 46#endif /* not lint */ 47 48#include <sys/types.h> 49#include <sys/resource.h> 50#include <sys/signal.h> 51#include <sys/sysctl.h> 52#include <sys/time.h> 53#include <sys/wait.h> 54 55#include <err.h> 56#include <errno.h> 57#include <locale.h> 58#include <signal.h> 59#include <stdio.h> 60#include <stdlib.h> 61#include <string.h> 62#include <unistd.h> 63 64static int getstathz(void); 65static void humantime(FILE *, long, long); 66static void usage(void); 67 68static char decimal_point; 69 70int 71main(int argc, char **argv) 72{ 73 int aflag, ch, hflag, lflag, status, pflag; 74 int exitonsig; 75 pid_t pid; 76 struct rlimit rl; 77 struct rusage ru; 78 struct timeval before, after; 79 char *ofn = NULL; 80 FILE *out = stderr; 81 82 (void) setlocale(LC_NUMERIC, ""); 83 decimal_point = localeconv()->decimal_point[0]; 84 85 aflag = hflag = lflag = pflag = 0; 86 while ((ch = getopt(argc, argv, "ahlo:p")) != -1) 87 switch((char)ch) { 88 case 'a': 89 aflag = 1; 90 break; 91 case 'h': 92 hflag = 1; 93 break; 94 case 'l': 95 lflag = 1; 96 break; 97 case 'o': 98 ofn = optarg; 99 break; 100 case 'p': 101 pflag = 1; 102 break; 103 case '?': 104 default: 105 usage(); 106 } 107 108 if (!(argc -= optind)) 109 exit(0); 110 argv += optind; 111 112 if (ofn) { 113 if ((out = fopen(ofn, aflag ? "a" : "w")) == NULL) 114 err(1, "%s", ofn); 115 setvbuf(out, (char *)NULL, _IONBF, (size_t)0); 116 } 117 118 gettimeofday(&before, (struct timezone *)NULL); 119 switch(pid = fork()) { 120 case -1: /* error */ 121 err(1, "time"); 122 /* NOTREACHED */ 123 case 0: /* child */ 124 execvp(*argv, argv); 125 err(errno == ENOENT ? 127 : 126, "%s", *argv); 126 /* NOTREACHED */ 127 } 128 /* parent */ 129 (void)signal(SIGINT, SIG_IGN); 130 (void)signal(SIGQUIT, SIG_IGN); 131 while (wait3(&status, 0, &ru) != pid); /* XXX use waitpid */ 132 gettimeofday(&after, (struct timezone *)NULL); 133 if ( ! WIFEXITED(status)) 134 warnx("command terminated abnormally"); 135 exitonsig = WIFSIGNALED(status) ? WTERMSIG(status) : 0; 136 after.tv_sec -= before.tv_sec; 137 after.tv_usec -= before.tv_usec; 138 if (after.tv_usec < 0) 139 after.tv_sec--, after.tv_usec += 1000000; 140 if (pflag) { 141 /* POSIX wants output that must look like 142 "real %f\nuser %f\nsys %f\n" and requires 143 at least two digits after the radix. */ 144 fprintf(out, "real %ld%c%02ld\n", 145 after.tv_sec, decimal_point, 146 after.tv_usec/10000); 147 fprintf(out, "user %ld%c%02ld\n", 148 ru.ru_utime.tv_sec, decimal_point, 149 ru.ru_utime.tv_usec/10000); 150 fprintf(out, "sys %ld%c%02ld\n", 151 ru.ru_stime.tv_sec, decimal_point, 152 ru.ru_stime.tv_usec/10000); 153 } else if (hflag) { 154 humantime(out, after.tv_sec, after.tv_usec/10000); 155 fprintf(out, " real\t"); 156 humantime(out, ru.ru_utime.tv_sec, ru.ru_utime.tv_usec/10000); 157 fprintf(out, " user\t"); 158 humantime(out, ru.ru_stime.tv_sec, ru.ru_stime.tv_usec/10000); 159 fprintf(out, " sys\n"); 160 } else { 161 fprintf(out, "%9ld%c%02ld real ", 162 after.tv_sec, decimal_point, 163 after.tv_usec/10000); 164 fprintf(out, "%9ld%c%02ld user ", 165 ru.ru_utime.tv_sec, decimal_point, 166 ru.ru_utime.tv_usec/10000); 167 fprintf(out, "%9ld%c%02ld sys\n", 168 ru.ru_stime.tv_sec, decimal_point, 169 ru.ru_stime.tv_usec/10000); 170 } 171 if (lflag) { 172 int hz = getstathz(); 173 u_long ticks; 174 175 ticks = hz * (ru.ru_utime.tv_sec + ru.ru_stime.tv_sec) + 176 hz * (ru.ru_utime.tv_usec + ru.ru_stime.tv_usec) / 1000000; 177 178 /* 179 * If our round-off on the tick calculation still puts us at 0, 180 * then always assume at least one tick. 181 */ 182 if (ticks == 0) 183 ticks = 1; 184 185 fprintf(out, "%10ld %s\n", 186 ru.ru_maxrss, "maximum resident set size"); 187 fprintf(out, "%10ld %s\n", 188 ru.ru_ixrss / ticks, "average shared memory size"); 189 fprintf(out, "%10ld %s\n", 190 ru.ru_idrss / ticks, "average unshared data size"); 191 fprintf(out, "%10ld %s\n", 192 ru.ru_isrss / ticks, "average unshared stack size"); 193 fprintf(out, "%10ld %s\n", 194 ru.ru_minflt, "page reclaims"); 195 fprintf(out, "%10ld %s\n", 196 ru.ru_majflt, "page faults"); 197 fprintf(out, "%10ld %s\n", 198 ru.ru_nswap, "swaps"); 199 fprintf(out, "%10ld %s\n", 200 ru.ru_inblock, "block input operations"); 201 fprintf(out, "%10ld %s\n", 202 ru.ru_oublock, "block output operations"); 203 fprintf(out, "%10ld %s\n", 204 ru.ru_msgsnd, "messages sent"); 205 fprintf(out, "%10ld %s\n", 206 ru.ru_msgrcv, "messages received"); 207 fprintf(out, "%10ld %s\n", 208 ru.ru_nsignals, "signals received"); 209 fprintf(out, "%10ld %s\n", 210 ru.ru_nvcsw, "voluntary context switches"); 211 fprintf(out, "%10ld %s\n", 212 ru.ru_nivcsw, "involuntary context switches"); 213 } 214 /* 215 * If the child has exited on a signal, exit on the same 216 * signal, too, in order to reproduce the child's exit status. 217 * However, avoid actually dumping core from the current process. 218 */ 219 if (exitonsig) { 220 if (signal(exitonsig, SIG_DFL) == SIG_ERR) 221 warn("signal"); 222 else { 223 rl.rlim_max = rl.rlim_cur = 0; 224 if (setrlimit(RLIMIT_CORE, &rl) == -1) 225 warn("setrlimit"); 226 kill(getpid(), exitonsig); 227 } 228 } 229 exit (WIFEXITED(status) ? WEXITSTATUS(status) : EXIT_FAILURE); 230} 231 232static void 233usage(void) 234{ 235 fprintf(stderr, 236 "usage: time [-al] [-h|-p] [-o file] utility [argument ...]\n"); 237 exit(1); 238} 239 240/* 241 * Return the frequency of the kernel's statistics clock. 242 */ 243static int 244getstathz(void) 245{ 246 int mib[2]; 247 size_t size; 248 struct clockinfo clockrate; 249 250 mib[0] = CTL_KERN; 251 mib[1] = KERN_CLOCKRATE; 252 size = sizeof clockrate; 253 if (sysctl(mib, 2, &clockrate, &size, NULL, 0) == -1) 254 err(1, "sysctl kern.clockrate"); 255 return clockrate.stathz; 256} 257 258static void 259humantime(FILE *out, long sec, long usec) 260{ 261 long days, hrs, mins; 262 263 days = sec / (60L * 60 * 24); 264 sec %= (60L * 60 * 24); 265 hrs = sec / (60L * 60); 266 sec %= (60L * 60); 267 mins = sec / 60; 268 sec %= 60; 269 270 fprintf(out, "\t"); 271 if (days) 272 fprintf(out, "%ldd", days); 273 if (hrs) 274 fprintf(out, "%ldh", hrs); 275 if (mins) 276 fprintf(out, "%ldm", mins); 277 fprintf(out, "%ld%c%02lds", sec, decimal_point, usec); 278} 279