iostat.c revision 1.25
1 /* $NetBSD: iostat.c,v 1.25 2002/01/28 02:16:56 simonb Exp $ */ 2 3 /* 4 * Copyright (c) 1996 John M. Vinopal 5 * 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed for the NetBSD Project 18 * by John M. Vinopal. 19 * 4. The name of the author may not be used to endorse or promote products 20 * derived from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 /*- 36 * Copyright (c) 1986, 1991, 1993 37 * The Regents of the University of California. All rights reserved. 38 * 39 * Redistribution and use in source and binary forms, with or without 40 * modification, are permitted provided that the following conditions 41 * are met: 42 * 1. Redistributions of source code must retain the above copyright 43 * notice, this list of conditions and the following disclaimer. 44 * 2. Redistributions in binary form must reproduce the above copyright 45 * notice, this list of conditions and the following disclaimer in the 46 * documentation and/or other materials provided with the distribution. 47 * 3. All advertising materials mentioning features or use of this software 48 * must display the following acknowledgement: 49 * This product includes software developed by the University of 50 * California, Berkeley and its contributors. 51 * 4. Neither the name of the University nor the names of its contributors 52 * may be used to endorse or promote products derived from this software 53 * without specific prior written permission. 54 * 55 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 56 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 57 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 58 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 59 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 60 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 61 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 62 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 63 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 64 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 65 * SUCH DAMAGE. 66 */ 67 68 #include <sys/cdefs.h> 69 #ifndef lint 70 __COPYRIGHT("@(#) Copyright (c) 1986, 1991, 1993\n\ 71 The Regents of the University of California. All rights reserved.\n"); 72 #endif /* not lint */ 73 74 #ifndef lint 75 #if 0 76 static char sccsid[] = "@(#)iostat.c 8.3 (Berkeley) 4/28/95"; 77 #else 78 __RCSID("$NetBSD: iostat.c,v 1.25 2002/01/28 02:16:56 simonb Exp $"); 79 #endif 80 #endif /* not lint */ 81 82 #include <sys/types.h> 83 #include <sys/sched.h> 84 #include <sys/dkstat.h> 85 #include <sys/time.h> 86 87 #include <err.h> 88 #include <ctype.h> 89 #include <signal.h> 90 #include <stdio.h> 91 #include <stdlib.h> 92 #include <string.h> 93 #include <unistd.h> 94 95 #include "dkstats.h" 96 97 /* Namelist and memory files. */ 98 char *nlistf, *memf; 99 100 int hz, reps, interval; 101 static int todo = 0; 102 103 #define ISSET(x, a) ((x) & (a)) 104 #define SHOW_CPU 1<<0 105 #define SHOW_TTY 1<<1 106 #define SHOW_STATS_1 1<<2 107 #define SHOW_STATS_2 1<<3 108 #define SHOW_STATS_X 1<<4 109 #define SHOW_TOTALS 1<<7 110 #define SHOW_STATS_ALL (SHOW_STATS_1 | SHOW_STATS_2 | SHOW_STATS_X) 111 112 static void cpustats(void); 113 static void disk_stats(double); 114 static void disk_stats2(double); 115 static void disk_statsx(double); 116 static void header(int); 117 static void usage(void); 118 static void display(void); 119 static void selectdrives(int, char **); 120 121 int main(int, char **); 122 123 int 124 main(int argc, char *argv[]) 125 { 126 int ch, hdrcnt; 127 struct timeval tv; 128 129 while ((ch = getopt(argc, argv, "Cc:dDIM:N:Tw:x")) != -1) 130 switch(ch) { 131 case 'c': 132 if ((reps = atoi(optarg)) <= 0) 133 errx(1, "repetition count <= 0."); 134 break; 135 case 'C': 136 todo |= SHOW_CPU; 137 break; 138 case 'd': 139 todo &= ~SHOW_STATS_ALL; 140 todo |= SHOW_STATS_1; 141 break; 142 case 'D': 143 todo &= ~SHOW_STATS_ALL; 144 todo |= SHOW_STATS_2; 145 break; 146 case 'I': 147 todo |= SHOW_TOTALS; 148 break; 149 case 'M': 150 memf = optarg; 151 break; 152 case 'N': 153 nlistf = optarg; 154 break; 155 case 'T': 156 todo |= SHOW_TTY; 157 break; 158 case 'w': 159 if ((interval = atoi(optarg)) <= 0) 160 errx(1, "interval <= 0."); 161 break; 162 case 'x': 163 todo &= ~SHOW_STATS_ALL; 164 todo |= SHOW_STATS_X; 165 break; 166 case '?': 167 default: 168 usage(); 169 } 170 argc -= optind; 171 argv += optind; 172 173 if (!ISSET(todo, SHOW_CPU | SHOW_TTY | SHOW_STATS_ALL)) 174 todo |= SHOW_CPU | SHOW_TTY | SHOW_STATS_1; 175 if (ISSET(todo, SHOW_STATS_X)) { 176 todo &= ~(SHOW_CPU | SHOW_TTY | SHOW_STATS_ALL); 177 todo |= SHOW_STATS_X; 178 } 179 180 /* 181 * Discard setgid privileges if not the running kernel so that bad 182 * guys can't print interesting stuff from kernel memory. 183 */ 184 if (nlistf != NULL || memf != NULL) 185 setgid(getgid()); 186 187 dkinit(0); 188 dkreadstats(); 189 selectdrives(argc, argv); 190 191 tv.tv_sec = interval; 192 tv.tv_usec = 0; 193 194 /* print a new header on sigcont */ 195 (void)signal(SIGCONT, header); 196 197 for (hdrcnt = 1;;) { 198 if (!--hdrcnt) { 199 header(0); 200 hdrcnt = 20; 201 } 202 203 if (!ISSET(todo, SHOW_TOTALS)) 204 dkswap(); 205 display(); 206 207 if (reps >= 0 && --reps <= 0) 208 break; 209 select(0, NULL, NULL, NULL, &tv); 210 dkreadstats(); 211 } 212 exit(0); 213 } 214 215 static void 216 header(int signo) 217 { 218 int i; 219 220 if (ISSET(todo, SHOW_STATS_X)) 221 return; 222 223 /* Main Headers. */ 224 if (ISSET(todo, SHOW_TTY)) 225 (void)printf(" tty"); 226 227 if (ISSET(todo, SHOW_STATS_1)) 228 for (i = 0; i < dk_ndrive; i++) 229 if (cur.dk_select[i]) 230 (void)printf( 231 " %7.7s ", cur.dk_name[i]); 232 233 if (ISSET(todo, SHOW_STATS_2)) 234 for (i = 0; i < dk_ndrive; i++) 235 if (cur.dk_select[i]) 236 (void)printf( 237 " %7.7s ", cur.dk_name[i]); 238 239 if (ISSET(todo, SHOW_CPU)) 240 (void)printf(" cpu"); 241 242 printf("\n"); 243 244 /* Sub-Headers. */ 245 if (ISSET(todo, SHOW_TTY)) 246 printf(" tin tout"); 247 248 if (ISSET(todo, SHOW_STATS_1)) { 249 for (i = 0; i < dk_ndrive; i++) 250 if (cur.dk_select[i]) { 251 if (ISSET(todo, SHOW_TOTALS)) 252 (void)printf(" KB/t xfr MB "); 253 else 254 (void)printf(" KB/t t/s MB/s "); 255 } 256 } 257 258 if (ISSET(todo, SHOW_STATS_2)) 259 for (i = 0; i < dk_ndrive; i++) 260 if (cur.dk_select[i]) 261 (void)printf(" KB xfr time "); 262 263 if (ISSET(todo, SHOW_CPU)) 264 (void)printf(" us ni sy in id"); 265 printf("\n"); 266 } 267 268 static void 269 disk_stats(double etime) 270 { 271 int dn; 272 double atime, mbps; 273 274 for (dn = 0; dn < dk_ndrive; ++dn) { 275 if (!cur.dk_select[dn]) 276 continue; 277 278 /* average Kbytes per transfer. */ 279 if (cur.dk_xfer[dn]) 280 mbps = (cur.dk_bytes[dn] / (1024.0)) / cur.dk_xfer[dn]; 281 else 282 mbps = 0.0; 283 (void)printf(" %5.2f", mbps); 284 285 /* average transfers per second. */ 286 (void)printf(" %3.0f", cur.dk_xfer[dn] / etime); 287 288 /* time busy in disk activity */ 289 atime = (double)cur.dk_time[dn].tv_sec + 290 ((double)cur.dk_time[dn].tv_usec / (double)1000000); 291 292 /* Megabytes per second. */ 293 if (atime != 0.0) 294 mbps = cur.dk_bytes[dn] / (double)(1024 * 1024); 295 else 296 mbps = 0; 297 (void)printf(" %4.2f ", mbps / etime); 298 } 299 } 300 301 static void 302 disk_stats2(double etime) 303 { 304 int dn; 305 double atime; 306 307 for (dn = 0; dn < dk_ndrive; ++dn) { 308 if (!cur.dk_select[dn]) 309 continue; 310 311 /* average kbytes per second. */ 312 (void)printf(" %4.0f", cur.dk_bytes[dn] / (1024.0) / etime); 313 314 /* average transfers per second. */ 315 (void)printf(" %3.0f", cur.dk_xfer[dn] / etime); 316 317 /* average time busy in disk activity */ 318 atime = (double)cur.dk_time[dn].tv_sec + 319 ((double)cur.dk_time[dn].tv_usec / (double)1000000); 320 (void)printf(" %4.2f ", atime / etime); 321 } 322 } 323 324 static void 325 disk_statsx(double etime) 326 { 327 int dn; 328 double atime, kbps; 329 330 if (ISSET(todo, SHOW_TOTALS)) 331 (void)printf("device KB/t xfr time MB"); 332 else 333 (void)printf("device KB/t t/s time MB/s"); 334 335 for (dn = 0; dn < dk_ndrive; ++dn) { 336 (void)printf("\n"); 337 (void)printf("%-8.8s", cur.dk_name[dn]); 338 339 /* average Kbytes per transfer */ 340 if (cur.dk_xfer[dn]) 341 kbps = (cur.dk_bytes[dn] / (1024.0)) / cur.dk_xfer[dn]; 342 else 343 kbps = 0.0; 344 (void)printf(" %8.2f", kbps); 345 346 /* average transfers (per second) */ 347 (void)printf(" %8.0f", cur.dk_xfer[dn] / etime); 348 349 /* time busy in disk activity */ 350 atime = (double)cur.dk_time[dn].tv_sec + 351 ((double)cur.dk_time[dn].tv_usec / (double)1000000); 352 (void)printf(" %8.2f", atime / etime); 353 354 /* average megabytes (per second) */ 355 (void)printf(" %8.2f", 356 cur.dk_bytes[dn] / (1024.0 * 1024) / etime); 357 358 } 359 } 360 361 static void 362 cpustats(void) 363 { 364 int state; 365 double time; 366 367 time = 0; 368 for (state = 0; state < CPUSTATES; ++state) 369 time += cur.cp_time[state]; 370 if (!time) 371 time = 1.0; 372 /* States are generally never 100% and can use %3.0f. */ 373 for (state = 0; state < CPUSTATES; ++state) 374 printf(" %2.0f", 100. * cur.cp_time[state] / time); 375 } 376 377 static void 378 usage(void) 379 { 380 381 (void)fprintf(stderr, "usage: iostat [-CdDITx] [-c count] [-M core] \ 382 [-N system] [-w wait] [drives]\n"); 383 exit(1); 384 } 385 386 static void 387 display(void) 388 { 389 int i; 390 double etime; 391 392 /* Sum up the elapsed ticks. */ 393 etime = 0.0; 394 for (i = 0; i < CPUSTATES; i++) { 395 etime += cur.cp_time[i]; 396 } 397 if (etime == 0.0) 398 etime = 1.0; 399 /* Convert to seconds. */ 400 etime /= (float)hz; 401 402 /* If we're showing totals only, then don't divide by the 403 * system time. 404 */ 405 if (ISSET(todo, SHOW_TOTALS)) 406 etime = 1.0; 407 408 if (ISSET(todo, SHOW_TTY)) 409 printf("%4.0f %4.0f", cur.tk_nin / etime, cur.tk_nout / etime); 410 411 if (ISSET(todo, SHOW_STATS_1)) 412 disk_stats(etime); 413 414 if (ISSET(todo, SHOW_STATS_2)) 415 disk_stats2(etime); 416 417 if (ISSET(todo, SHOW_STATS_X)) 418 disk_statsx(etime); 419 420 if (ISSET(todo, SHOW_CPU)) 421 cpustats(); 422 423 (void)printf("\n"); 424 (void)fflush(stdout); 425 } 426 427 static void 428 selectdrives(int argc, char *argv[]) 429 { 430 int i, ndrives; 431 432 /* 433 * Choose drives to be displayed. Priority goes to (in order) drives 434 * supplied as arguments and default drives. If everything isn't 435 * filled in and there are drives not taken care of, display the first 436 * few that fit. 437 * 438 * The backward compatibility #ifdefs permit the syntax: 439 * iostat [ drives ] [ interval [ count ] ] 440 */ 441 if (ISSET(todo, SHOW_STATS_X)) { 442 for (i = 0; i < dk_ndrive; i++) 443 cur.dk_select[i] = 1; 444 } 445 446 #define BACKWARD_COMPATIBILITY 447 for (ndrives = 0; *argv; ++argv) { 448 #ifdef BACKWARD_COMPATIBILITY 449 if (isdigit(**argv)) 450 break; 451 #endif 452 if (!ISSET(todo, SHOW_STATS_X)) 453 for (i = 0; i < dk_ndrive; i++) { 454 if (strcmp(cur.dk_name[i], *argv)) 455 continue; 456 cur.dk_select[i] = 1; 457 ++ndrives; 458 } 459 } 460 #ifdef BACKWARD_COMPATIBILITY 461 if (*argv) { 462 interval = atoi(*argv); 463 if (*++argv) 464 reps = atoi(*argv); 465 } 466 #endif 467 468 if (interval) { 469 if (!reps) 470 reps = -1; 471 } else 472 if (reps) 473 interval = 1; 474 475 /* Pick up to 4 drives if none specified. */ 476 if (ndrives == 0) 477 for (i = 0; i < dk_ndrive && ndrives < 4; i++) { 478 if (cur.dk_select[i]) 479 continue; 480 cur.dk_select[i] = 1; 481 ++ndrives; 482 } 483 } 484
Indexes created Wed Sep 24 05:09:52 GMT 2025