iostat.c revision 1.23
1 /* $NetBSD: iostat.c,v 1.23 2000/11/30 23:59:04 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 1.23 2000/11/30 23:59:04 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 /* Defined in dkstats.c */ 98 extern struct _disk cur; 99 extern int dk_ndrive; 100 101 /* Namelist and memory files. */ 102 char *nlistf, *memf; 103 104 int hz, reps, interval; 105 static int todo = 0; 106 107 #define ISSET(x, a) ((x) & (a)) 108 #define SHOW_CPU 1<<0 109 #define SHOW_TTY 1<<1 110 #define SHOW_STATS_1 1<<2 111 #define SHOW_STATS_2 1<<3 112 #define SHOW_STATS_X 1<<4 113 #define SHOW_TOTALS 1<<7 114 #define SHOW_STATS_ALL (SHOW_STATS_1 | SHOW_STATS_2 | SHOW_STATS_X) 115 116 static void cpustats(void); 117 static void disk_stats(double); 118 static void disk_stats2(double); 119 static void disk_statsx(double); 120 static void header(int); 121 static void usage(void); 122 static void display(void); 123 static void selectdrives(int, char **); 124 125 void dkswap(void); 126 void dkreadstats(void); 127 int dkinit(int, gid_t); 128 int main(int, char **); 129 130 int 131 main(int argc, char *argv[]) 132 { 133 int ch, hdrcnt; 134 struct timeval tv; 135 gid_t egid = getegid(); 136 setegid(getgid()); 137 138 while ((ch = getopt(argc, argv, "Cc:dDIM:N:Tw:x")) != -1) 139 switch(ch) { 140 case 'c': 141 if ((reps = atoi(optarg)) <= 0) 142 errx(1, "repetition count <= 0."); 143 break; 144 case 'C': 145 todo |= SHOW_CPU; 146 break; 147 case 'd': 148 todo &= ~SHOW_STATS_ALL; 149 todo |= SHOW_STATS_1; 150 break; 151 case 'D': 152 todo &= ~SHOW_STATS_ALL; 153 todo |= SHOW_STATS_2; 154 break; 155 case 'I': 156 todo |= SHOW_TOTALS; 157 break; 158 case 'M': 159 memf = optarg; 160 break; 161 case 'N': 162 nlistf = optarg; 163 break; 164 case 'T': 165 todo |= SHOW_TTY; 166 break; 167 case 'w': 168 if ((interval = atoi(optarg)) <= 0) 169 errx(1, "interval <= 0."); 170 break; 171 case 'x': 172 todo &= ~SHOW_STATS_ALL; 173 todo |= SHOW_STATS_X; 174 break; 175 case '?': 176 default: 177 usage(); 178 } 179 argc -= optind; 180 argv += optind; 181 182 if (!ISSET(todo, SHOW_CPU | SHOW_TTY | SHOW_STATS_ALL)) 183 todo |= SHOW_CPU | SHOW_TTY | SHOW_STATS_1; 184 if (ISSET(todo, SHOW_STATS_X)) { 185 todo &= ~(SHOW_CPU | SHOW_TTY | SHOW_STATS_ALL); 186 todo |= SHOW_STATS_X; 187 } 188 189 /* 190 * Discard setgid privileges if not the running kernel so that bad 191 * guys can't print interesting stuff from kernel memory. 192 */ 193 if (nlistf != NULL || memf != NULL) 194 setgid(getgid()); 195 196 dkinit(0, egid); 197 dkreadstats(); 198 selectdrives(argc, argv); 199 200 tv.tv_sec = interval; 201 tv.tv_usec = 0; 202 203 /* print a new header on sigcont */ 204 (void)signal(SIGCONT, header); 205 206 for (hdrcnt = 1;;) { 207 if (!--hdrcnt) { 208 header(0); 209 hdrcnt = 20; 210 } 211 212 if (!ISSET(todo, SHOW_TOTALS)) 213 dkswap(); 214 display(); 215 216 if (reps >= 0 && --reps <= 0) 217 break; 218 select(0, NULL, NULL, NULL, &tv); 219 dkreadstats(); 220 } 221 exit(0); 222 } 223 224 static void 225 header(int signo) 226 { 227 int i; 228 229 if (ISSET(todo, SHOW_STATS_X)) 230 return; 231 232 /* Main Headers. */ 233 if (ISSET(todo, SHOW_TTY)) 234 (void)printf(" tty"); 235 236 if (ISSET(todo, SHOW_STATS_1)) 237 for (i = 0; i < dk_ndrive; i++) 238 if (cur.dk_select[i]) 239 (void)printf( 240 " %7.7s ", cur.dk_name[i]); 241 242 if (ISSET(todo, SHOW_STATS_2)) 243 for (i = 0; i < dk_ndrive; i++) 244 if (cur.dk_select[i]) 245 (void)printf( 246 " %7.7s ", cur.dk_name[i]); 247 248 if (ISSET(todo, SHOW_CPU)) 249 (void)printf(" cpu"); 250 251 printf("\n"); 252 253 /* Sub-Headers. */ 254 if (ISSET(todo, SHOW_TTY)) 255 printf(" tin tout"); 256 257 if (ISSET(todo, SHOW_STATS_1)) { 258 for (i = 0; i < dk_ndrive; i++) 259 if (cur.dk_select[i]) { 260 if (ISSET(todo, SHOW_TOTALS)) 261 (void)printf(" KB/t xfr MB "); 262 else 263 (void)printf(" KB/t t/s MB/s "); 264 } 265 } 266 267 if (ISSET(todo, SHOW_STATS_2)) 268 for (i = 0; i < dk_ndrive; i++) 269 if (cur.dk_select[i]) 270 (void)printf(" KB xfr time "); 271 272 if (ISSET(todo, SHOW_CPU)) 273 (void)printf(" us ni sy in id"); 274 printf("\n"); 275 } 276 277 static void 278 disk_stats(double etime) 279 { 280 int dn; 281 double atime, mbps; 282 283 for (dn = 0; dn < dk_ndrive; ++dn) { 284 if (!cur.dk_select[dn]) 285 continue; 286 287 /* average Kbytes per transfer. */ 288 if (cur.dk_xfer[dn]) 289 mbps = (cur.dk_bytes[dn] / (1024.0)) / cur.dk_xfer[dn]; 290 else 291 mbps = 0.0; 292 (void)printf(" %5.2f", mbps); 293 294 /* average transfers per second. */ 295 (void)printf(" %3.0f", cur.dk_xfer[dn] / etime); 296 297 /* time busy in disk activity */ 298 atime = (double)cur.dk_time[dn].tv_sec + 299 ((double)cur.dk_time[dn].tv_usec / (double)1000000); 300 301 /* Megabytes per second. */ 302 if (atime != 0.0) 303 mbps = cur.dk_bytes[dn] / (double)(1024 * 1024); 304 else 305 mbps = 0; 306 (void)printf(" %4.2f ", mbps / etime); 307 } 308 } 309 310 static void 311 disk_stats2(double etime) 312 { 313 int dn; 314 double atime; 315 316 for (dn = 0; dn < dk_ndrive; ++dn) { 317 if (!cur.dk_select[dn]) 318 continue; 319 320 /* average kbytes per second. */ 321 (void)printf(" %4.0f", cur.dk_bytes[dn] / (1024.0) / etime); 322 323 /* average transfers per second. */ 324 (void)printf(" %3.0f", cur.dk_xfer[dn] / etime); 325 326 /* average time busy in disk activity */ 327 atime = (double)cur.dk_time[dn].tv_sec + 328 ((double)cur.dk_time[dn].tv_usec / (double)1000000); 329 (void)printf(" %4.2f ", atime / etime); 330 } 331 } 332 333 static void 334 disk_statsx(double etime) 335 { 336 int dn; 337 double atime, kbps; 338 339 if (ISSET(todo, SHOW_TOTALS)) 340 (void)printf("device KB/t xfr time MB"); 341 else 342 (void)printf("device KB/t t/s time MB/s"); 343 344 for (dn = 0; dn < dk_ndrive; ++dn) { 345 (void)printf("\n"); 346 (void)printf("%-8.8s", cur.dk_name[dn]); 347 348 /* average Kbytes per transfer */ 349 if (cur.dk_xfer[dn]) 350 kbps = (cur.dk_bytes[dn] / (1024.0)) / cur.dk_xfer[dn]; 351 else 352 kbps = 0.0; 353 (void)printf(" %8.2f", kbps); 354 355 /* average transfers (per second) */ 356 (void)printf(" %8.0f", cur.dk_xfer[dn] / etime); 357 358 /* time busy in disk activity */ 359 atime = (double)cur.dk_time[dn].tv_sec + 360 ((double)cur.dk_time[dn].tv_usec / (double)1000000); 361 (void)printf(" %8.2f", atime / etime); 362 363 /* average megabytes (per second) */ 364 (void)printf(" %8.2f", 365 cur.dk_bytes[dn] / (1024.0 * 1024) / etime); 366 367 } 368 } 369 370 static void 371 cpustats(void) 372 { 373 int state; 374 double time; 375 376 time = 0; 377 for (state = 0; state < CPUSTATES; ++state) 378 time += cur.cp_time[state]; 379 if (!time) 380 time = 1.0; 381 /* States are generally never 100% and can use %3.0f. */ 382 for (state = 0; state < CPUSTATES; ++state) 383 printf(" %2.0f", 100. * cur.cp_time[state] / time); 384 } 385 386 static void 387 usage(void) 388 { 389 390 (void)fprintf(stderr, "usage: iostat [-CdDITx] [-c count] [-M core] \ 391 [-N system] [-w wait] [drives]\n"); 392 exit(1); 393 } 394 395 static void 396 display(void) 397 { 398 int i; 399 double etime; 400 401 /* Sum up the elapsed ticks. */ 402 etime = 0.0; 403 for (i = 0; i < CPUSTATES; i++) { 404 etime += cur.cp_time[i]; 405 } 406 if (etime == 0.0) 407 etime = 1.0; 408 /* Convert to seconds. */ 409 etime /= (float)hz; 410 411 /* If we're showing totals only, then don't divide by the 412 * system time. 413 */ 414 if (ISSET(todo, SHOW_TOTALS)) 415 etime = 1.0; 416 417 if (ISSET(todo, SHOW_TTY)) 418 printf("%4.0f %4.0f", cur.tk_nin / etime, cur.tk_nout / etime); 419 420 if (ISSET(todo, SHOW_STATS_1)) 421 disk_stats(etime); 422 423 if (ISSET(todo, SHOW_STATS_2)) 424 disk_stats2(etime); 425 426 if (ISSET(todo, SHOW_STATS_X)) 427 disk_statsx(etime); 428 429 if (ISSET(todo, SHOW_CPU)) 430 cpustats(); 431 432 (void)printf("\n"); 433 (void)fflush(stdout); 434 } 435 436 static void 437 selectdrives(int argc, char *argv[]) 438 { 439 int i, ndrives; 440 441 /* 442 * Choose drives to be displayed. Priority goes to (in order) drives 443 * supplied as arguments and default drives. If everything isn't 444 * filled in and there are drives not taken care of, display the first 445 * few that fit. 446 * 447 * The backward compatibility #ifdefs permit the syntax: 448 * iostat [ drives ] [ interval [ count ] ] 449 */ 450 if (ISSET(todo, SHOW_STATS_X)) { 451 for (i = 0; i < dk_ndrive; i++) 452 cur.dk_select[i] = 1; 453 } 454 455 #define BACKWARD_COMPATIBILITY 456 for (ndrives = 0; *argv; ++argv) { 457 #ifdef BACKWARD_COMPATIBILITY 458 if (isdigit(**argv)) 459 break; 460 #endif 461 if (!ISSET(todo, SHOW_STATS_X)) 462 for (i = 0; i < dk_ndrive; i++) { 463 if (strcmp(cur.dk_name[i], *argv)) 464 continue; 465 cur.dk_select[i] = 1; 466 ++ndrives; 467 } 468 } 469 #ifdef BACKWARD_COMPATIBILITY 470 if (*argv) { 471 interval = atoi(*argv); 472 if (*++argv) 473 reps = atoi(*argv); 474 } 475 #endif 476 477 if (interval) { 478 if (!reps) 479 reps = -1; 480 } else 481 if (reps) 482 interval = 1; 483 484 /* Pick up to 4 drives if none specified. */ 485 if (ndrives == 0) 486 for (i = 0; i < dk_ndrive && ndrives < 4; i++) { 487 if (cur.dk_select[i]) 488 continue; 489 cur.dk_select[i] = 1; 490 ++ndrives; 491 } 492 } 493
Indexes created Tue Sep 23 07:09:52 GMT 2025