1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1987, 1988, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/types.h> 33 #include <sys/resource.h> 34 #include <sys/signal.h> 35 #include <sys/sysctl.h> 36 #include <sys/time.h> 37 #include <sys/wait.h> 38 39 #include <err.h> 40 #include <errno.h> 41 #include <locale.h> 42 #include <signal.h> 43 #include <stdio.h> 44 #include <stdlib.h> 45 #include <stdint.h> 46 #include <string.h> 47 #include <time.h> 48 #include <unistd.h> 49 50 static int getstathz(void); 51 static void humantime(FILE *, long, long); 52 static void showtime(FILE *, struct timespec *, struct timespec *, 53 struct rusage *); 54 static void siginfo(int); 55 static void usage(void) __dead2; 56 57 static volatile sig_atomic_t siginfo_recvd; 58 static char decimal_point; 59 static struct timespec before_ts; 60 static int hflag, pflag; 61 62 int 63 main(int argc, char **argv) 64 { 65 int aflag, ch, lflag, status; 66 int exitonsig; 67 pid_t pid; 68 struct rlimit rl; 69 struct rusage ru; 70 struct timespec after; 71 char *ofn = NULL; 72 FILE *out = stderr; 73 74 (void) setlocale(LC_NUMERIC, ""); 75 decimal_point = localeconv()->decimal_point[0]; 76 77 aflag = hflag = lflag = pflag = 0; 78 while ((ch = getopt(argc, argv, "ahlo:p")) != -1) 79 switch((char)ch) { 80 case 'a': 81 aflag = 1; 82 break; 83 case 'h': 84 hflag = 1; 85 break; 86 case 'l': 87 lflag = 1; 88 break; 89 case 'o': 90 ofn = optarg; 91 break; 92 case 'p': 93 pflag = 1; 94 break; 95 case '?': 96 default: 97 usage(); 98 } 99 100 if (!(argc -= optind)) 101 exit(0); 102 argv += optind; 103 104 if (ofn) { 105 if ((out = fopen(ofn, aflag ? "ae" : "we")) == NULL) 106 err(1, "%s", ofn); 107 setvbuf(out, (char *)NULL, _IONBF, (size_t)0); 108 } 109 110 if (clock_gettime(CLOCK_MONOTONIC, &before_ts)) 111 err(1, "clock_gettime"); 112 switch(pid = fork()) { 113 case -1: /* error */ 114 err(1, "time"); 115 /* NOTREACHED */ 116 case 0: /* child */ 117 execvp(*argv, argv); 118 err(errno == ENOENT ? 127 : 126, "%s", *argv); 119 /* NOTREACHED */ 120 } 121 /* parent */ 122 (void)signal(SIGINT, SIG_IGN); 123 (void)signal(SIGQUIT, SIG_IGN); 124 siginfo_recvd = 0; 125 (void)signal(SIGINFO, siginfo); 126 (void)siginterrupt(SIGINFO, 1); 127 while (wait4(pid, &status, 0, &ru) != pid) { 128 if (siginfo_recvd) { 129 siginfo_recvd = 0; 130 if (clock_gettime(CLOCK_MONOTONIC, &after)) 131 err(1, "clock_gettime"); 132 getrusage(RUSAGE_CHILDREN, &ru); 133 showtime(stdout, &before_ts, &after, &ru); 134 } 135 } 136 if (clock_gettime(CLOCK_MONOTONIC, &after)) 137 err(1, "clock_gettime"); 138 if ( ! WIFEXITED(status)) 139 warnx("command terminated abnormally"); 140 exitonsig = WIFSIGNALED(status) ? WTERMSIG(status) : 0; 141 showtime(out, &before_ts, &after, &ru); 142 if (lflag) { 143 int hz = getstathz(); 144 u_long ticks; 145 146 ticks = hz * (ru.ru_utime.tv_sec + ru.ru_stime.tv_sec) + 147 hz * (ru.ru_utime.tv_usec + ru.ru_stime.tv_usec) / 1000000; 148 149 /* 150 * If our round-off on the tick calculation still puts us at 0, 151 * then always assume at least one tick. 152 */ 153 if (ticks == 0) 154 ticks = 1; 155 156 fprintf(out, "%10ld %s\n", 157 ru.ru_maxrss, "maximum resident set size"); 158 fprintf(out, "%10ld %s\n", 159 ru.ru_ixrss / ticks, "average shared memory size"); 160 fprintf(out, "%10ld %s\n", 161 ru.ru_idrss / ticks, "average unshared data size"); 162 fprintf(out, "%10ld %s\n", 163 ru.ru_isrss / ticks, "average unshared stack size"); 164 fprintf(out, "%10ld %s\n", 165 ru.ru_minflt, "page reclaims"); 166 fprintf(out, "%10ld %s\n", 167 ru.ru_majflt, "page faults"); 168 fprintf(out, "%10ld %s\n", 169 ru.ru_nswap, "swaps"); 170 fprintf(out, "%10ld %s\n", 171 ru.ru_inblock, "block input operations"); 172 fprintf(out, "%10ld %s\n", 173 ru.ru_oublock, "block output operations"); 174 fprintf(out, "%10ld %s\n", 175 ru.ru_msgsnd, "messages sent"); 176 fprintf(out, "%10ld %s\n", 177 ru.ru_msgrcv, "messages received"); 178 fprintf(out, "%10ld %s\n", 179 ru.ru_nsignals, "signals received"); 180 fprintf(out, "%10ld %s\n", 181 ru.ru_nvcsw, "voluntary context switches"); 182 fprintf(out, "%10ld %s\n", 183 ru.ru_nivcsw, "involuntary context switches"); 184 } 185 /* 186 * If the child has exited on a signal, exit on the same 187 * signal, too, in order to reproduce the child's exit status. 188 * However, avoid actually dumping core from the current process. 189 */ 190 if (exitonsig) { 191 if (signal(exitonsig, SIG_DFL) == SIG_ERR) 192 warn("signal"); 193 else { 194 rl.rlim_max = rl.rlim_cur = 0; 195 if (setrlimit(RLIMIT_CORE, &rl) == -1) 196 warn("setrlimit"); 197 kill(getpid(), exitonsig); 198 } 199 } 200 exit (WIFEXITED(status) ? WEXITSTATUS(status) : EXIT_FAILURE); 201 } 202 203 static void 204 usage(void) 205 { 206 fprintf(stderr, 207 "usage: time [-al] [-h | -p] [-o file] utility [argument ...]\n"); 208 exit(1); 209 } 210 211 /* 212 * Return the frequency of the kernel's statistics clock. 213 */ 214 static int 215 getstathz(void) 216 { 217 int mib[2]; 218 size_t size; 219 struct clockinfo clockrate; 220 221 mib[0] = CTL_KERN; 222 mib[1] = KERN_CLOCKRATE; 223 size = sizeof clockrate; 224 if (sysctl(mib, 2, &clockrate, &size, NULL, 0) == -1) 225 err(1, "sysctl kern.clockrate"); 226 return clockrate.stathz; 227 } 228 229 static void 230 humantime(FILE *out, long sec, long centisec) 231 { 232 long days, hrs, mins; 233 234 days = sec / (60L * 60 * 24); 235 sec %= (60L * 60 * 24); 236 hrs = sec / (60L * 60); 237 sec %= (60L * 60); 238 mins = sec / 60; 239 sec %= 60; 240 241 fprintf(out, "\t"); 242 if (days) 243 fprintf(out, "%ldd", days); 244 if (hrs) 245 fprintf(out, "%ldh", hrs); 246 if (mins) 247 fprintf(out, "%ldm", mins); 248 fprintf(out, "%ld%c%02lds", sec, decimal_point, centisec); 249 } 250 251 static void 252 showtime(FILE *out, struct timespec *before, struct timespec *after, 253 struct rusage *ru) 254 { 255 256 after->tv_sec -= before->tv_sec; 257 after->tv_nsec -= before->tv_nsec; 258 if (after->tv_nsec < 0) 259 after->tv_sec--, after->tv_nsec += 1000000000; 260 261 if (pflag) { 262 /* POSIX wants output that must look like 263 "real %f\nuser %f\nsys %f\n" and requires 264 at least two digits after the radix. */ 265 fprintf(out, "real %jd%c%02ld\n", 266 (intmax_t)after->tv_sec, decimal_point, 267 after->tv_nsec/10000000); 268 fprintf(out, "user %jd%c%02ld\n", 269 (intmax_t)ru->ru_utime.tv_sec, decimal_point, 270 ru->ru_utime.tv_usec/10000); 271 fprintf(out, "sys %jd%c%02ld\n", 272 (intmax_t)ru->ru_stime.tv_sec, decimal_point, 273 ru->ru_stime.tv_usec/10000); 274 } else if (hflag) { 275 humantime(out, after->tv_sec, after->tv_nsec/10000000); 276 fprintf(out, " real\t"); 277 humantime(out, ru->ru_utime.tv_sec, ru->ru_utime.tv_usec/10000); 278 fprintf(out, " user\t"); 279 humantime(out, ru->ru_stime.tv_sec, ru->ru_stime.tv_usec/10000); 280 fprintf(out, " sys\n"); 281 } else { 282 fprintf(out, "%9jd%c%02ld real ", 283 (intmax_t)after->tv_sec, decimal_point, 284 after->tv_nsec/10000000); 285 fprintf(out, "%9jd%c%02ld user ", 286 (intmax_t)ru->ru_utime.tv_sec, decimal_point, 287 ru->ru_utime.tv_usec/10000); 288 fprintf(out, "%9jd%c%02ld sys\n", 289 (intmax_t)ru->ru_stime.tv_sec, decimal_point, 290 ru->ru_stime.tv_usec/10000); 291 } 292 } 293 294 static void 295 siginfo(int sig __unused) 296 { 297 298 siginfo_recvd = 1; 299 } 300