iostat.c revision 1.14
1 /* $NetBSD: iostat.c,v 1.14 1998/07/19 17:48:15 drochner 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 1.14 1998/07/19 17:48:15 drochner 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 0x0001 108 #define SHOW_TTY 0x0002 109 #define SHOW_STATS_1 0x0004 110 #define SHOW_STATS_2 0x0008 111 #define SHOW_TOTALS 0x0080 112 113 static void cpustats __P((void)); 114 static void disk_stats __P((double)); 115 static void disk_stats2 __P((double)); 116 static void header __P((int)); 117 static void usage __P((void)); 118 static void display __P((void)); 119 static void selectdrives __P((int, char **)); 120 121 void dkswap __P((void)); 122 void dkreadstats __P((void)); 123 int dkinit __P((int, gid_t)); 124 int main __P((int, char **)); 125 126 int 127 main(argc, argv) 128 int argc; 129 char *argv[]; 130 { 131 int ch, hdrcnt; 132 struct timeval tv; 133 gid_t egid = getegid(); 134 setegid(getgid()); 135 136 while ((ch = getopt(argc, argv, "Cc:dDIM:N:Tw:")) != -1) 137 switch(ch) { 138 case 'c': 139 if ((reps = atoi(optarg)) <= 0) 140 errx(1, "repetition count <= 0."); 141 break; 142 case 'C': 143 todo |= SHOW_CPU; 144 break; 145 case 'd': 146 todo |= SHOW_STATS_1; 147 break; 148 case 'D': 149 todo |= SHOW_STATS_2; 150 break; 151 case 'I': 152 todo |= SHOW_TOTALS; 153 break; 154 case 'M': 155 memf = optarg; 156 break; 157 case 'N': 158 nlistf = optarg; 159 break; 160 case 'T': 161 todo |= SHOW_TTY; 162 break; 163 case 'w': 164 if ((interval = atoi(optarg)) <= 0) 165 errx(1, "interval <= 0."); 166 break; 167 case '?': 168 default: 169 usage(); 170 } 171 argc -= optind; 172 argv += optind; 173 174 if (!ISSET(todo, SHOW_CPU | SHOW_TTY | SHOW_STATS_1 | SHOW_STATS_2)) 175 todo |= SHOW_CPU | SHOW_TTY | SHOW_STATS_1; 176 177 /* 178 * Discard setgid privileges if not the running kernel so that bad 179 * guys can't print interesting stuff from kernel memory. 180 */ 181 if (nlistf != NULL || memf != NULL) 182 setgid(getgid()); 183 184 dkinit(0, egid); 185 dkreadstats(); 186 selectdrives(argc, argv); 187 188 tv.tv_sec = interval; 189 tv.tv_usec = 0; 190 191 /* print a new header on sigcont */ 192 (void)signal(SIGCONT, header); 193 194 for (hdrcnt = 1;;) { 195 if (!--hdrcnt) { 196 header(0); 197 hdrcnt = 20; 198 } 199 200 if (!ISSET(todo, SHOW_TOTALS)) 201 dkswap(); 202 display(); 203 204 if (reps >= 0 && --reps <= 0) 205 break; 206 select(0, NULL, NULL, NULL, &tv); 207 dkreadstats(); 208 } 209 exit(0); 210 } 211 212 static void 213 header(signo) 214 int signo; 215 { 216 int i; 217 218 /* Main Headers. */ 219 if (ISSET(todo, SHOW_TTY)) 220 (void)printf(" tty"); 221 222 if (ISSET(todo, SHOW_STATS_1)) 223 for (i = 0; i < dk_ndrive; i++) 224 if (cur.dk_select[i]) 225 (void)printf(" %3.3s ", cur.dk_name[i]); 226 227 if (ISSET(todo, SHOW_STATS_2)) 228 for (i = 0; i < dk_ndrive; i++) 229 if (cur.dk_select[i]) 230 (void)printf(" %3.3s ", cur.dk_name[i]); 231 232 if (ISSET(todo, SHOW_CPU)) 233 (void)printf(" cpu"); 234 printf("\n"); 235 236 /* Sub-Headers. */ 237 if (ISSET(todo, SHOW_TTY)) 238 printf(" tin tout"); 239 240 if (ISSET(todo, SHOW_STATS_1)) 241 for (i = 0; i < dk_ndrive; i++) 242 if (cur.dk_select[i]) 243 if (ISSET(todo, SHOW_TOTALS)) 244 (void)printf(" KB/t xfr MB "); 245 else 246 (void)printf(" KB/t t/s MB/s "); 247 248 if (ISSET(todo, SHOW_STATS_2)) 249 for (i = 0; i < dk_ndrive; i++) 250 if (cur.dk_select[i]) 251 (void)printf(" KB xfr time "); 252 253 if (ISSET(todo, SHOW_CPU)) 254 (void)printf(" us ni sy in id"); 255 printf("\n"); 256 } 257 258 static void 259 disk_stats(etime) 260 double etime; 261 { 262 int dn; 263 double atime, mbps; 264 265 for (dn = 0; dn < dk_ndrive; ++dn) { 266 if (!cur.dk_select[dn]) 267 continue; 268 269 /* average Kbytes per transfer. */ 270 if (cur.dk_xfer[dn]) 271 mbps = (cur.dk_bytes[dn] / (1024.0)) / cur.dk_xfer[dn]; 272 else 273 mbps = 0.0; 274 (void)printf(" %5.2f", mbps); 275 276 /* average transfers per second. */ 277 (void)printf(" %3.0f", cur.dk_xfer[dn] / etime); 278 279 /* time busy in disk activity */ 280 atime = (double)cur.dk_time[dn].tv_sec + 281 ((double)cur.dk_time[dn].tv_usec / (double)1000000); 282 283 /* Megabytes per second. */ 284 if (atime != 0.0) 285 mbps = cur.dk_bytes[dn] / (double)(1024 * 1024); 286 else 287 mbps = 0; 288 (void)printf(" %4.2f ", mbps / etime); 289 } 290 } 291 292 static void 293 disk_stats2(etime) 294 double etime; 295 { 296 int dn; 297 double atime; 298 299 for (dn = 0; dn < dk_ndrive; ++dn) { 300 if (!cur.dk_select[dn]) 301 continue; 302 303 /* average kbytes per second. */ 304 (void)printf(" %4.0f", cur.dk_bytes[dn] / (1024.0) / etime); 305 306 /* average transfers per second. */ 307 (void)printf(" %3.0f", cur.dk_xfer[dn] / etime); 308 309 /* average time busy in disk activity. */ 310 atime = (double)cur.dk_time[dn].tv_sec + 311 ((double)cur.dk_time[dn].tv_usec / (double)1000000); 312 (void)printf(" %4.2f ", atime / etime); 313 } 314 } 315 316 static void 317 cpustats() 318 { 319 int state; 320 double time; 321 322 time = 0; 323 for (state = 0; state < CPUSTATES; ++state) 324 time += cur.cp_time[state]; 325 if (!time) 326 time = 1.0; 327 /* States are generally never 100% and can use %3.0f. */ 328 for (state = 0; state < CPUSTATES; ++state) 329 printf("%3.0f", 100. * cur.cp_time[state] / time); 330 } 331 332 static void 333 usage() 334 { 335 336 (void)fprintf(stderr, 337 "usage: iostat [-CdDIT] [-c count] [-M core] [-N system] [-w wait] [drives]\n"); 338 exit(1); 339 } 340 341 static void 342 display() 343 { 344 int i; 345 double etime; 346 347 /* Sum up the elapsed ticks. */ 348 etime = 0.0; 349 for (i = 0; i < CPUSTATES; i++) { 350 etime += cur.cp_time[i]; 351 } 352 if (etime == 0.0) 353 etime = 1.0; 354 /* Convert to seconds. */ 355 etime /= (float)hz; 356 357 /* If we're showing totals only, then don't divide by the 358 * system time. 359 */ 360 if (ISSET(todo, SHOW_TOTALS)) 361 etime = 1.0; 362 363 if (ISSET(todo, SHOW_TTY)) 364 printf("%4.0f %4.0f", cur.tk_nin / etime, cur.tk_nout / etime); 365 366 if (ISSET(todo, SHOW_STATS_1)) 367 disk_stats(etime); 368 369 if (ISSET(todo, SHOW_STATS_2)) 370 disk_stats2(etime); 371 372 if (ISSET(todo, SHOW_CPU)) 373 cpustats(); 374 375 (void)printf("\n"); 376 (void)fflush(stdout); 377 } 378 379 static void 380 selectdrives(argc, argv) 381 int argc; 382 char *argv[]; 383 { 384 int i, ndrives; 385 386 /* 387 * Choose drives to be displayed. Priority goes to (in order) drives 388 * supplied as arguments and default drives. If everything isn't 389 * filled in and there are drives not taken care of, display the first 390 * few that fit. 391 * 392 * The backward compatibility #ifdefs permit the syntax: 393 * iostat [ drives ] [ interval [ count ] ] 394 */ 395 #define BACKWARD_COMPATIBILITY 396 for (ndrives = 0; *argv; ++argv) { 397 #ifdef BACKWARD_COMPATIBILITY 398 if (isdigit(**argv)) 399 break; 400 #endif 401 for (i = 0; i < dk_ndrive; i++) { 402 if (strcmp(cur.dk_name[i], *argv)) 403 continue; 404 cur.dk_select[i] = 1; 405 ++ndrives; 406 } 407 } 408 #ifdef BACKWARD_COMPATIBILITY 409 if (*argv) { 410 interval = atoi(*argv); 411 if (*++argv) 412 reps = atoi(*argv); 413 } 414 #endif 415 416 if (interval) { 417 if (!reps) 418 reps = -1; 419 } else 420 if (reps) 421 interval = 1; 422 423 /* Pick up to 4 drives if none specified. */ 424 if (ndrives == 0) 425 for (i = 0; i < dk_ndrive && ndrives < 4; i++) { 426 if (cur.dk_select[i]) 427 continue; 428 cur.dk_select[i] = 1; 429 ++ndrives; 430 } 431 } 432
Indexes created Tue Sep 23 23:09:58 GMT 2025