time.c revision 87300
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 87300 2001-12-03 21:32:01Z dwmalone $"; 46#endif /* not lint */ 47 48#include <sys/types.h> 49#include <sys/time.h> 50#include <sys/resource.h> 51#include <sys/signal.h> 52#include <sys/sysctl.h> 53#include <stdlib.h> 54#include <sys/wait.h> 55 56#include <err.h> 57#include <stdio.h> 58#include <errno.h> 59#include <locale.h> 60#include <string.h> 61#include <unistd.h> 62#include <signal.h> 63 64static int getstathz __P((void)); 65static void humantime __P((FILE *, long, long)); 66static void usage __P((void)); 67 68static char decimal_point; 69 70int 71main(argc, argv) 72 int argc; 73 char **argv; 74{ 75 register int pid; 76 int aflag, ch, hflag, lflag, status, pflag; 77 struct timeval before, after; 78 struct rusage ru; 79 FILE *out = stderr; 80 char *ofn = NULL; 81 int exitonsig = 0; /* Die with same signal as child */ 82 83 (void) setlocale(LC_NUMERIC, ""); 84 decimal_point = localeconv()->decimal_point[0]; 85 86 aflag = hflag = lflag = pflag = 0; 87 while ((ch = getopt(argc, argv, "ahlo:p")) != -1) 88 switch((char)ch) { 89 case 'a': 90 aflag = 1; 91 break; 92 case 'h': 93 hflag = 1; 94 break; 95 case 'l': 96 lflag = 1; 97 break; 98 case 'o': 99 ofn = optarg; 100 break; 101 case 'p': 102 pflag = 1; 103 break; 104 case '?': 105 default: 106 usage(); 107 } 108 109 if (!(argc -= optind)) 110 exit(0); 111 argv += optind; 112 113 if (ofn) { 114 if ((out = fopen(ofn, aflag ? "a" : "w")) == NULL) 115 err(1, "%s", ofn); 116 setvbuf(out, (char *)NULL, _IONBF, (size_t)0); 117 } 118 119 gettimeofday(&before, (struct timezone *)NULL); 120 switch(pid = fork()) { 121 case -1: /* error */ 122 err(1, "time"); 123 /* NOTREACHED */ 124 case 0: /* child */ 125 errno = 0; 126 execvp(*argv, argv); 127 warn("%s", *argv); 128 if (errno == ENOENT) 129 _exit(127); /* POSIX: utility could not be found */ 130 else 131 _exit(126); /* POSIX: utility could not be invoked */ 132 /* NOTREACHED */ 133 } 134 /* parent */ 135 (void)signal(SIGINT, SIG_IGN); 136 (void)signal(SIGQUIT, SIG_IGN); 137 while (wait3(&status, 0, &ru) != pid); /* XXX use waitpid */ 138 gettimeofday(&after, (struct timezone *)NULL); 139 if ( ! WIFEXITED(status)) 140 warnx("command terminated abnormally"); 141 if (WIFSIGNALED(status)) 142 exitonsig = WTERMSIG(status); 143 after.tv_sec -= before.tv_sec; 144 after.tv_usec -= before.tv_usec; 145 if (after.tv_usec < 0) 146 after.tv_sec--, after.tv_usec += 1000000; 147 if (pflag) { 148 /* POSIX wants output that must look like 149 "real %f\nuser %f\nsys %f\n" and requires 150 at least two digits after the radix. */ 151 fprintf(out, "real %ld%c%02ld\n", 152 after.tv_sec, decimal_point, 153 after.tv_usec/10000); 154 fprintf(out, "user %ld%c%02ld\n", 155 ru.ru_utime.tv_sec, decimal_point, 156 ru.ru_utime.tv_usec/10000); 157 fprintf(out, "sys %ld%c%02ld\n", 158 ru.ru_stime.tv_sec, decimal_point, 159 ru.ru_stime.tv_usec/10000); 160 } else if (hflag) { 161 humantime(out, after.tv_sec, after.tv_usec/10000); 162 fprintf(out, " real\t"); 163 humantime(out, ru.ru_utime.tv_sec, ru.ru_utime.tv_usec/10000); 164 fprintf(out, " user\t"); 165 humantime(out, ru.ru_stime.tv_sec, ru.ru_stime.tv_usec/10000); 166 fprintf(out, " sys\n"); 167 } else { 168 fprintf(out, "%9ld%c%02ld real ", 169 after.tv_sec, decimal_point, 170 after.tv_usec/10000); 171 fprintf(out, "%9ld%c%02ld user ", 172 ru.ru_utime.tv_sec, decimal_point, 173 ru.ru_utime.tv_usec/10000); 174 fprintf(out, "%9ld%c%02ld sys\n", 175 ru.ru_stime.tv_sec, decimal_point, 176 ru.ru_stime.tv_usec/10000); 177 } 178 if (lflag) { 179 int hz = getstathz(); 180 u_long ticks; 181 182 ticks = hz * (ru.ru_utime.tv_sec + ru.ru_stime.tv_sec) + 183 hz * (ru.ru_utime.tv_usec + ru.ru_stime.tv_usec) / 1000000; 184 185 /* 186 * If our round-off on the tick calculation still puts us at 0, 187 * then always assume at least one tick. 188 */ 189 if (ticks == 0) 190 ticks = 1; 191 192 fprintf(out, "%10ld %s\n", 193 ru.ru_maxrss, "maximum resident set size"); 194 fprintf(out, "%10ld %s\n", 195 ru.ru_ixrss / ticks, "average shared memory size"); 196 fprintf(out, "%10ld %s\n", 197 ru.ru_idrss / ticks, "average unshared data size"); 198 fprintf(out, "%10ld %s\n", 199 ru.ru_isrss / ticks, "average unshared stack size"); 200 fprintf(out, "%10ld %s\n", 201 ru.ru_minflt, "page reclaims"); 202 fprintf(out, "%10ld %s\n", 203 ru.ru_majflt, "page faults"); 204 fprintf(out, "%10ld %s\n", 205 ru.ru_nswap, "swaps"); 206 fprintf(out, "%10ld %s\n", 207 ru.ru_inblock, "block input operations"); 208 fprintf(out, "%10ld %s\n", 209 ru.ru_oublock, "block output operations"); 210 fprintf(out, "%10ld %s\n", 211 ru.ru_msgsnd, "messages sent"); 212 fprintf(out, "%10ld %s\n", 213 ru.ru_msgrcv, "messages received"); 214 fprintf(out, "%10ld %s\n", 215 ru.ru_nsignals, "signals received"); 216 fprintf(out, "%10ld %s\n", 217 ru.ru_nvcsw, "voluntary context switches"); 218 fprintf(out, "%10ld %s\n", 219 ru.ru_nivcsw, "involuntary context switches"); 220 } 221 if (exitonsig) { 222 if (signal(exitonsig, SIG_DFL) == SIG_ERR) 223 perror("signal"); 224 else 225 kill(getpid(), exitonsig); 226 } 227 exit (WIFEXITED(status) ? WEXITSTATUS(status) : EXIT_FAILURE); 228} 229 230static void 231usage() 232{ 233 fprintf(stderr, "usage: time [-al] [-h|-p] [-o file] command\n"); 234 exit(1); 235} 236 237/* 238 * Return the frequency of the kernel's statistics clock. 239 */ 240static int 241getstathz() 242{ 243 struct clockinfo clockrate; 244 int mib[2]; 245 size_t size; 246 247 mib[0] = CTL_KERN; 248 mib[1] = KERN_CLOCKRATE; 249 size = sizeof clockrate; 250 if (sysctl(mib, 2, &clockrate, &size, NULL, 0) == -1) 251 err(1, "sysctl kern.clockrate"); 252 return clockrate.stathz; 253} 254 255static void 256humantime(out, sec, usec) 257 FILE *out; 258 long sec; 259 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