time.c revision 37913
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 "$Id: time.c,v 1.9 1998/07/27 16:54:05 des Exp $"; 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 <string.h> 59#include <unistd.h> 60 61static int getstathz __P((void)); 62static void usage __P((void)); 63 64int 65main(argc, argv) 66 int argc; 67 char **argv; 68{ 69 extern char *optarg; 70 extern int optind; 71 72 register int pid; 73 int aflag, ch, lflag, status; 74 struct timeval before, after; 75 struct rusage ru; 76 FILE *out = stderr; 77 char *ofn = NULL; 78 79 aflag = lflag = 0; 80 while ((ch = getopt(argc, argv, "alo:")) != -1) 81 switch((char)ch) { 82 case 'a': 83 aflag = 1; 84 break; 85 case 'l': 86 lflag = 1; 87 break; 88 case 'o': 89 ofn = optarg; 90 break; 91 case '?': 92 default: 93 usage(); 94 } 95 96 if (!(argc -= optind)) 97 exit(0); 98 argv += optind; 99 100 if (ofn) { 101 if ((out = fopen(ofn, aflag ? "a" : "w")) == NULL) 102 err(1, "%s", ofn); 103 setvbuf(out, (char *)NULL, _IONBF, (size_t)0); 104 } 105 106 gettimeofday(&before, (struct timezone *)NULL); 107 switch(pid = vfork()) { 108 case -1: /* error */ 109 err(1, "time"); 110 /* NOTREACHED */ 111 case 0: /* child */ 112 execvp(*argv, argv); 113 warn("%s", *argv); 114 _exit(1); 115 /* NOTREACHED */ 116 } 117 /* parent */ 118 (void)signal(SIGINT, SIG_IGN); 119 (void)signal(SIGQUIT, SIG_IGN); 120 while (wait3(&status, 0, &ru) != pid); /* XXX use waitpid */ 121 gettimeofday(&after, (struct timezone *)NULL); 122 if (status&0377) 123 warnx("command terminated abnormally"); 124 after.tv_sec -= before.tv_sec; 125 after.tv_usec -= before.tv_usec; 126 if (after.tv_usec < 0) 127 after.tv_sec--, after.tv_usec += 1000000; 128 fprintf(out, "%9ld.%02ld real ", after.tv_sec, after.tv_usec/10000); 129 fprintf(out, "%9ld.%02ld user ", 130 ru.ru_utime.tv_sec, ru.ru_utime.tv_usec/10000); 131 fprintf(out, "%9ld.%02ld sys\n", 132 ru.ru_stime.tv_sec, ru.ru_stime.tv_usec/10000); 133 if (lflag) { 134 int hz = getstathz(); 135 u_long ticks; 136 137 ticks = hz * (ru.ru_utime.tv_sec + ru.ru_stime.tv_sec) + 138 hz * (ru.ru_utime.tv_usec + ru.ru_stime.tv_usec) / 1000000; 139 140 /* 141 * If our round-off on the tick calculation still puts us at 0, 142 * then always assume at least one tick. 143 */ 144 if (ticks == 0) 145 ticks = 1; 146 147 fprintf(out, "%10ld %s\n", 148 ru.ru_maxrss, "maximum resident set size"); 149 fprintf(out, "%10ld %s\n", 150 ru.ru_ixrss / ticks, "average shared memory size"); 151 fprintf(out, "%10ld %s\n", 152 ru.ru_idrss / ticks, "average unshared data size"); 153 fprintf(out, "%10ld %s\n", 154 ru.ru_isrss / ticks, "average unshared stack size"); 155 fprintf(out, "%10ld %s\n", 156 ru.ru_minflt, "page reclaims"); 157 fprintf(out, "%10ld %s\n", 158 ru.ru_majflt, "page faults"); 159 fprintf(out, "%10ld %s\n", 160 ru.ru_nswap, "swaps"); 161 fprintf(out, "%10ld %s\n", 162 ru.ru_inblock, "block input operations"); 163 fprintf(out, "%10ld %s\n", 164 ru.ru_oublock, "block output operations"); 165 fprintf(out, "%10ld %s\n", 166 ru.ru_msgsnd, "messages sent"); 167 fprintf(out, "%10ld %s\n", 168 ru.ru_msgrcv, "messages received"); 169 fprintf(out, "%10ld %s\n", 170 ru.ru_nsignals, "signals received"); 171 fprintf(out, "%10ld %s\n", 172 ru.ru_nvcsw, "voluntary context switches"); 173 fprintf(out, "%10ld %s\n", 174 ru.ru_nivcsw, "involuntary context switches"); 175 } 176 exit (WIFEXITED(status) ? WEXITSTATUS(status) : EXIT_FAILURE); 177} 178 179static void 180usage() 181{ 182 fprintf(stderr, "usage: time [-al] [-o file] command\n"); 183 exit(1); 184} 185 186/* 187 * Return the frequency of the kernel's statistics clock. 188 */ 189static int 190getstathz() 191{ 192 struct clockinfo clockrate; 193 int mib[2]; 194 size_t size; 195 196 mib[0] = CTL_KERN; 197 mib[1] = KERN_CLOCKRATE; 198 size = sizeof clockrate; 199 if (sysctl(mib, 2, &clockrate, &size, NULL, 0) == -1) 200 err(1, "sysctl kern.clockrate"); 201 return clockrate.stathz; 202} 203