time.c revision 50477
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 50477 1999-08-28 01:08:13Z peter $"; 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 <string.h> 60#include <unistd.h> 61#include <signal.h> 62 63static int getstathz __P((void)); 64static void usage __P((void)); 65 66int 67main(argc, argv) 68 int argc; 69 char **argv; 70{ 71 extern char *optarg; 72 extern int optind; 73 74 register int pid; 75 int aflag, ch, lflag, status, pflag; 76 struct timeval before, after; 77 struct rusage ru; 78 FILE *out = stderr; 79 char *ofn = NULL; 80 int exitonsig = 0; /* Die with same signal as child */ 81 82 aflag = lflag = pflag = 0; 83 while ((ch = getopt(argc, argv, "alo:p")) != -1) 84 switch((char)ch) { 85 case 'a': 86 aflag = 1; 87 break; 88 case 'l': 89 lflag = 1; 90 break; 91 case 'o': 92 ofn = optarg; 93 break; 94 case 'p': 95 pflag = 1; 96 break; 97 case '?': 98 default: 99 usage(); 100 } 101 102 if (!(argc -= optind)) 103 exit(0); 104 argv += optind; 105 106 if (ofn) { 107 if ((out = fopen(ofn, aflag ? "a" : "w")) == NULL) 108 err(1, "%s", ofn); 109 setvbuf(out, (char *)NULL, _IONBF, (size_t)0); 110 } 111 112 gettimeofday(&before, (struct timezone *)NULL); 113 switch(pid = fork()) { 114 case -1: /* error */ 115 err(1, "time"); 116 /* NOTREACHED */ 117 case 0: /* child */ 118 errno = 0; 119 execvp(*argv, argv); 120 warn("%s", *argv); 121 if (errno == ENOENT) 122 _exit(127); /* POSIX: utility could not be found */ 123 else 124 _exit(126); /* POSIX: utility could not be invoked */ 125 /* NOTREACHED */ 126 } 127 /* parent */ 128 (void)signal(SIGINT, SIG_IGN); 129 (void)signal(SIGQUIT, SIG_IGN); 130 while (wait3(&status, 0, &ru) != pid); /* XXX use waitpid */ 131 gettimeofday(&after, (struct timezone *)NULL); 132 if ( ! WIFEXITED(status)) 133 warnx("command terminated abnormally"); 134 if (WIFSIGNALED(status)) 135 exitonsig = WTERMSIG(status); 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.%02ld\n", 145 after.tv_sec, after.tv_usec/10000); 146 fprintf(out, "user %ld.%02ld\n", 147 ru.ru_utime.tv_sec, ru.ru_utime.tv_usec/10000); 148 fprintf(out, "sys %ld.%02ld\n", 149 ru.ru_stime.tv_sec, ru.ru_stime.tv_usec/10000); 150 } else { 151 fprintf(out, "%9ld.%02ld real ", 152 after.tv_sec, after.tv_usec/10000); 153 fprintf(out, "%9ld.%02ld user ", 154 ru.ru_utime.tv_sec, ru.ru_utime.tv_usec/10000); 155 fprintf(out, "%9ld.%02ld sys\n", 156 ru.ru_stime.tv_sec, ru.ru_stime.tv_usec/10000); 157 } 158 if (lflag) { 159 int hz = getstathz(); 160 u_long ticks; 161 162 ticks = hz * (ru.ru_utime.tv_sec + ru.ru_stime.tv_sec) + 163 hz * (ru.ru_utime.tv_usec + ru.ru_stime.tv_usec) / 1000000; 164 165 /* 166 * If our round-off on the tick calculation still puts us at 0, 167 * then always assume at least one tick. 168 */ 169 if (ticks == 0) 170 ticks = 1; 171 172 fprintf(out, "%10ld %s\n", 173 ru.ru_maxrss, "maximum resident set size"); 174 fprintf(out, "%10ld %s\n", 175 ru.ru_ixrss / ticks, "average shared memory size"); 176 fprintf(out, "%10ld %s\n", 177 ru.ru_idrss / ticks, "average unshared data size"); 178 fprintf(out, "%10ld %s\n", 179 ru.ru_isrss / ticks, "average unshared stack size"); 180 fprintf(out, "%10ld %s\n", 181 ru.ru_minflt, "page reclaims"); 182 fprintf(out, "%10ld %s\n", 183 ru.ru_majflt, "page faults"); 184 fprintf(out, "%10ld %s\n", 185 ru.ru_nswap, "swaps"); 186 fprintf(out, "%10ld %s\n", 187 ru.ru_inblock, "block input operations"); 188 fprintf(out, "%10ld %s\n", 189 ru.ru_oublock, "block output operations"); 190 fprintf(out, "%10ld %s\n", 191 ru.ru_msgsnd, "messages sent"); 192 fprintf(out, "%10ld %s\n", 193 ru.ru_msgrcv, "messages received"); 194 fprintf(out, "%10ld %s\n", 195 ru.ru_nsignals, "signals received"); 196 fprintf(out, "%10ld %s\n", 197 ru.ru_nvcsw, "voluntary context switches"); 198 fprintf(out, "%10ld %s\n", 199 ru.ru_nivcsw, "involuntary context switches"); 200 } 201 if (exitonsig) { 202 if (signal(exitonsig, SIG_DFL) < 0) 203 perror("signal"); 204 else 205 kill(getpid(), exitonsig); 206 } 207 exit (WIFEXITED(status) ? WEXITSTATUS(status) : EXIT_FAILURE); 208} 209 210static void 211usage() 212{ 213 fprintf(stderr, "usage: time [-alp] [-o file] command\n"); 214 exit(1); 215} 216 217/* 218 * Return the frequency of the kernel's statistics clock. 219 */ 220static int 221getstathz() 222{ 223 struct clockinfo clockrate; 224 int mib[2]; 225 size_t size; 226 227 mib[0] = CTL_KERN; 228 mib[1] = KERN_CLOCKRATE; 229 size = sizeof clockrate; 230 if (sysctl(mib, 2, &clockrate, &size, NULL, 0) == -1) 231 err(1, "sysctl kern.clockrate"); 232 return clockrate.stathz; 233} 234