iostat.c revision 1.18
1 /* $NetBSD: iostat.c,v 1.18 1999/06/27 12:32:13 mjl 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 1.18 1999/06/27 12:32:13 mjl Exp $"); 79 #endif 80 #endif /* not lint */ 81 82 #include <sys/types.h> 83 #include <sys/dkstat.h> 84 #include <sys/time.h> 85 86 #include <err.h> 87 #include <ctype.h> 88 #include <signal.h> 89 #include <stdio.h> 90 #include <stdlib.h> 91 #include <string.h> 92 #include <unistd.h> 93 94 #include "dkstats.h" 95 96 /* Defined in dkstats.c */ 97 extern struct _disk cur; 98 extern int dk_ndrive; 99 100 /* Namelist and memory files. */ 101 char *nlistf, *memf; 102 103 int hz, reps, interval; 104 static int todo = 0; 105 106 #define ISSET(x, a) ((x) & (a)) 107 #define SHOW_CPU 1<<0 108 #define SHOW_TTY 1<<1 109 #define SHOW_STATS_1 1<<2 110 #define SHOW_STATS_2 1<<3 111 #define SHOW_STATS_X 1<<4 112 #define SHOW_TOTALS 1<<7 113 #define SHOW_STATS_ALL (SHOW_STATS_1 | SHOW_STATS_2 | SHOW_STATS_X) 114 115 static void cpustats __P((void)); 116 static void disk_stats __P((double)); 117 static void disk_stats2 __P((double)); 118 static void disk_statsx __P((double)); 119 static void header __P((int)); 120 static void usage __P((void)); 121 static void display __P((void)); 122 static void selectdrives __P((int, char **)); 123 124 void dkswap __P((void)); 125 void dkreadstats __P((void)); 126 int dkinit __P((int, gid_t)); 127 int main __P((int, char **)); 128 129 int 130 main(argc, argv) 131 int argc; 132 char *argv[]; 133 { 134 int ch, hdrcnt; 135 struct timeval tv; 136 gid_t egid = getegid(); 137 setegid(getgid()); 138 139 while ((ch = getopt(argc, argv, "Cc:dDIM:N:Tw:x")) != -1) 140 switch(ch) { 141 case 'c': 142 if ((reps = atoi(optarg)) <= 0) 143 errx(1, "repetition count <= 0."); 144 break; 145 case 'C': 146 todo |= SHOW_CPU; 147 break; 148 case 'd': 149 todo &= ~SHOW_STATS_ALL; 150 todo |= SHOW_STATS_1; 151 break; 152 case 'D': 153 todo &= ~SHOW_STATS_ALL; 154 todo |= SHOW_STATS_2; 155 break; 156 case 'I': 157 todo |= SHOW_TOTALS; 158 break; 159 case 'M': 160 memf = optarg; 161 break; 162 case 'N': 163 nlistf = optarg; 164 break; 165 case 'T': 166 todo |= SHOW_TTY; 167 break; 168 case 'w': 169 if ((interval = atoi(optarg)) <= 0) 170 errx(1, "interval <= 0."); 171 break; 172 case 'x': 173 todo &= ~SHOW_STATS_ALL; 174 todo |= SHOW_STATS_X; 175 break; 176 case '?': 177 default: 178 usage(); 179 } 180 argc -= optind; 181 argv += optind; 182 183 if (!ISSET(todo, SHOW_CPU | SHOW_TTY | SHOW_STATS_ALL)) 184 todo |= SHOW_CPU | SHOW_TTY | SHOW_STATS_1; 185 if (ISSET(todo, SHOW_STATS_X)) { 186 todo &= ~(SHOW_CPU | SHOW_TTY | SHOW_STATS_ALL); 187 todo |= SHOW_STATS_X; 188 } 189 190 /* 191 * Discard setgid privileges if not the running kernel so that bad 192 * guys can't print interesting stuff from kernel memory. 193 */ 194 if (nlistf != NULL || memf != NULL) 195 setgid(getgid()); 196 197 dkinit(0, egid); 198 dkreadstats(); 199 selectdrives(argc, argv); 200 201 tv.tv_sec = interval; 202 tv.tv_usec = 0; 203 204 /* print a new header on sigcont */ 205 (void)signal(SIGCONT, header); 206 207 for (hdrcnt = 1;;) { 208 if (!--hdrcnt) { 209 header(0); 210 hdrcnt = 20; 211 } 212 213 if (!ISSET(todo, SHOW_TOTALS)) 214 dkswap(); 215 display(); 216 217 if (reps >= 0 && --reps <= 0) 218 break; 219 select(0, NULL, NULL, NULL, &tv); 220 dkreadstats(); 221 } 222 exit(0); 223 } 224 225 static void 226 header(signo) 227 int signo; 228 { 229 int i; 230 231 if (ISSET(todo, SHOW_STATS_X)) 232 return; 233 234 /* Main Headers. */ 235 if (ISSET(todo, SHOW_TTY)) 236 (void)printf(" tty"); 237 238 if (ISSET(todo, SHOW_STATS_1)) 239 for (i = 0; i < dk_ndrive; i++) 240 if (cur.dk_select[i]) 241 (void)printf( 242 " %7.7s ", cur.dk_name[i]); 243 244 if (ISSET(todo, SHOW_STATS_2)) 245 for (i = 0; i < dk_ndrive; i++) 246 if (cur.dk_select[i]) 247 (void)printf( 248 " %7.7s ", cur.dk_name[i]); 249 250 if (ISSET(todo, SHOW_CPU)) 251 (void)printf(" cpu"); 252 253 printf("\n"); 254 255 /* Sub-Headers. */ 256 if (ISSET(todo, SHOW_TTY)) 257 printf(" tin tout"); 258 259 if (ISSET(todo, SHOW_STATS_1)) { 260 for (i = 0; i < dk_ndrive; i++) 261 if (cur.dk_select[i]) { 262 if (ISSET(todo, SHOW_TOTALS)) 263 (void)printf(" KB/t xfr MB "); 264 else 265 (void)printf(" KB/t t/s MB/s "); 266 } 267 } 268 269 if (ISSET(todo, SHOW_STATS_2)) 270 for (i = 0; i < dk_ndrive; i++) 271 if (cur.dk_select[i]) 272 (void)printf(" KB xfr time "); 273 274 if (ISSET(todo, SHOW_CPU)) 275 (void)printf(" us ni sy in id"); 276 printf("\n"); 277 } 278 279 static void 280 disk_stats(etime) 281 double etime; 282 { 283 int dn; 284 double atime, mbps; 285 286 for (dn = 0; dn < dk_ndrive; ++dn) { 287 if (!cur.dk_select[dn]) 288 continue; 289 290 /* average Kbytes per transfer. */ 291 if (cur.dk_xfer[dn]) 292 mbps = (cur.dk_bytes[dn] / (1024.0)) / cur.dk_xfer[dn]; 293 else 294 mbps = 0.0; 295 (void)printf(" %5.2f", mbps); 296 297 /* average transfers per second. */ 298 (void)printf(" %3.0f", cur.dk_xfer[dn] / etime); 299 300 /* time busy in disk activity */ 301 atime = (double)cur.dk_time[dn].tv_sec + 302 ((double)cur.dk_time[dn].tv_usec / (double)1000000); 303 304 /* Megabytes per second. */ 305 if (atime != 0.0) 306 mbps = cur.dk_bytes[dn] / (double)(1024 * 1024); 307 else 308 mbps = 0; 309 (void)printf(" %4.2f ", mbps / etime); 310 } 311 } 312 313 static void 314 disk_stats2(etime) 315 double etime; 316 { 317 int dn; 318 double atime; 319 320 for (dn = 0; dn < dk_ndrive; ++dn) { 321 if (!cur.dk_select[dn]) 322 continue; 323 324 /* average kbytes per second. */ 325 (void)printf(" %4.0f", cur.dk_bytes[dn] / (1024.0) / etime); 326 327 /* average transfers per second. */ 328 (void)printf(" %3.0f", cur.dk_xfer[dn] / etime); 329 330 /* average time busy in disk activity */ 331 atime = (double)cur.dk_time[dn].tv_sec + 332 ((double)cur.dk_time[dn].tv_usec / (double)1000000); 333 (void)printf(" %4.2f ", atime / etime); 334 } 335 } 336 337 static void 338 disk_statsx(etime) 339 double etime; 340 { 341 int dn; 342 double atime, kbps; 343 344 if (ISSET(todo, SHOW_TOTALS)) 345 (void)printf("device KB/t xfr time MB"); 346 else 347 (void)printf("device KB/t t/s time MB/s"); 348 349 for (dn = 0; dn < dk_ndrive; ++dn) { 350 (void)printf("\n"); 351 (void)printf("%-8.8s", cur.dk_name[dn]); 352 353 /* average Kbytes per transfer */ 354 if (cur.dk_xfer[dn]) 355 kbps = (cur.dk_bytes[dn] / (1024.0)) / cur.dk_xfer[dn]; 356 else 357 kbps = 0.0; 358 (void)printf(" %8.2f", kbps); 359 360 /* average transfers (per second) */ 361 (void)printf(" %8.0f", cur.dk_xfer[dn] / etime); 362 363 /* time busy in disk activity */ 364 atime = (double)cur.dk_time[dn].tv_sec + 365 ((double)cur.dk_time[dn].tv_usec / (double)1000000); 366 (void)printf(" %8.2f", atime / etime); 367 368 /* average megabytes (per second) */ 369 (void)printf(" %8.2f", 370 cur.dk_bytes[dn] / (1024.0 * 1024) / etime); 371 372 } 373 } 374 375 static void 376 cpustats() 377 { 378 int state; 379 double time; 380 381 time = 0; 382 for (state = 0; state < CPUSTATES; ++state) 383 time += cur.cp_time[state]; 384 if (!time) 385 time = 1.0; 386 /* States are generally never 100% and can use %3.0f. */ 387 for (state = 0; state < CPUSTATES; ++state) 388 printf("%3.0f", 100. * cur.cp_time[state] / time); 389 } 390 391 static void 392 usage() 393 { 394 395 (void)fprintf(stderr, "usage: iostat [-CdDITx] [-c count] [-M core] \ 396 [-N system] [-w wait] [drives]\n"); 397 exit(1); 398 } 399 400 static void 401 display() 402 { 403 int i; 404 double etime; 405 406 /* Sum up the elapsed ticks. */ 407 etime = 0.0; 408 for (i = 0; i < CPUSTATES; i++) { 409 etime += cur.cp_time[i]; 410 } 411 if (etime == 0.0) 412 etime = 1.0; 413 /* Convert to seconds. */ 414 etime /= (float)hz; 415 416 /* If we're showing totals only, then don't divide by the 417 * system time. 418 */ 419 if (ISSET(todo, SHOW_TOTALS)) 420 etime = 1.0; 421 422 if (ISSET(todo, SHOW_TTY)) 423 printf("%4.0f %4.0f", cur.tk_nin / etime, cur.tk_nout / etime); 424 425 if (ISSET(todo, SHOW_STATS_1)) 426 disk_stats(etime); 427 428 if (ISSET(todo, SHOW_STATS_2)) 429 disk_stats2(etime); 430 431 if (ISSET(todo, SHOW_STATS_X)) 432 disk_statsx(etime); 433 434 if (ISSET(todo, SHOW_CPU)) 435 cpustats(); 436 437 (void)printf("\n"); 438 (void)fflush(stdout); 439 } 440 441 static void 442 selectdrives(argc, argv) 443 int argc; 444 char *argv[]; 445 { 446 int i, ndrives; 447 448 /* 449 * Choose drives to be displayed. Priority goes to (in order) drives 450 * supplied as arguments and default drives. If everything isn't 451 * filled in and there are drives not taken care of, display the first 452 * few that fit. 453 * 454 * The backward compatibility #ifdefs permit the syntax: 455 * iostat [ drives ] [ interval [ count ] ] 456 */ 457 #define BACKWARD_COMPATIBILITY 458 for (ndrives = 0; *argv; ++argv) { 459 #ifdef BACKWARD_COMPATIBILITY 460 if (isdigit(**argv)) 461 break; 462 #endif 463 for (i = 0; i < dk_ndrive; i++) { 464 if (strcmp(cur.dk_name[i], *argv)) 465 continue; 466 cur.dk_select[i] = 1; 467 ++ndrives; 468 } 469 } 470 #ifdef BACKWARD_COMPATIBILITY 471 if (*argv) { 472 interval = atoi(*argv); 473 if (*++argv) 474 reps = atoi(*argv); 475 } 476 #endif 477 478 if (interval) { 479 if (!reps) 480 reps = -1; 481 } else 482 if (reps) 483 interval = 1; 484 485 /* Pick up to 4 drives if none specified. */ 486 if (ndrives == 0) 487 for (i = 0; i < dk_ndrive && ndrives < 4; i++) { 488 if (cur.dk_select[i]) 489 continue; 490 cur.dk_select[i] = 1; 491 ++ndrives; 492 } 493 } 494
Indexes created Mon Sep 22 21:09:42 GMT 2025