kgmon.c revision 1.12
1 /* $NetBSD: kgmon.c,v 1.12 2000/08/03 21:14:20 eeh Exp $ */ 2 3 /* 4 * Copyright (c) 1983, 1992, 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 __COPYRIGHT("@(#) Copyright (c) 1983, 1992, 1993\n\ 39 The Regents of the University of California. All rights reserved.\n"); 40 #endif /* not lint */ 41 42 #ifndef lint 43 #if 0 44 static char sccsid[] = "from: @(#)kgmon.c 8.1 (Berkeley) 6/6/93"; 45 #else 46 __RCSID("$NetBSD: kgmon.c,v 1.12 2000/08/03 21:14:20 eeh Exp $"); 47 #endif 48 #endif /* not lint */ 49 50 #include <sys/param.h> 51 #include <sys/file.h> 52 #include <sys/sysctl.h> 53 #include <sys/gmon.h> 54 55 #include <ctype.h> 56 #include <errno.h> 57 #include <kvm.h> 58 #include <limits.h> 59 #include <nlist.h> 60 #include <paths.h> 61 #include <stdio.h> 62 #include <stdlib.h> 63 #include <string.h> 64 #include <unistd.h> 65 66 struct nlist nl[] = { 67 #define N_GMONPARAM 0 68 { "__gmonparam" }, 69 #define N_PROFHZ 1 70 { "_profhz" }, 71 { 0, } 72 }; 73 74 struct kvmvars { 75 kvm_t *kd; 76 struct gmonparam gpm; 77 }; 78 79 int bflag, hflag, kflag, rflag, pflag; 80 int debug = 0; 81 void setprof __P((struct kvmvars *kvp, int state)); 82 void dumpstate __P((struct kvmvars *kvp)); 83 void reset __P((struct kvmvars *kvp)); 84 int openfiles __P((char *, char *, struct kvmvars *)); 85 int getprof __P((struct kvmvars *)); 86 void kern_readonly __P((int)); 87 int getprofhz __P(( struct kvmvars *)); 88 89 int 90 main(int argc, char **argv) 91 { 92 int ch, mode, disp, accessmode; 93 struct kvmvars kvmvars; 94 char *system, *kmemf; 95 96 seteuid(getuid()); 97 kmemf = NULL; 98 system = NULL; 99 while ((ch = getopt(argc, argv, "M:N:bdhpr")) != -1) { 100 switch((char)ch) { 101 102 case 'M': 103 kmemf = optarg; 104 kflag = 1; 105 break; 106 107 case 'N': 108 system = optarg; 109 break; 110 111 case 'b': 112 bflag = 1; 113 break; 114 115 case 'h': 116 hflag = 1; 117 break; 118 119 case 'p': 120 pflag = 1; 121 break; 122 123 case 'r': 124 rflag = 1; 125 break; 126 127 case 'd': 128 debug = 1; 129 break; 130 131 default: 132 (void)fprintf(stderr, 133 "usage: kgmon [-bhrp] [-M core] [-N system]\n"); 134 exit(1); 135 } 136 } 137 argc -= optind; 138 argv += optind; 139 140 #define BACKWARD_COMPATIBILITY 141 #ifdef BACKWARD_COMPATIBILITY 142 if (*argv) { 143 system = *argv; 144 if (*++argv) { 145 kmemf = *argv; 146 ++kflag; 147 } 148 } 149 #endif 150 if (system == NULL) 151 system = _PATH_UNIX; 152 accessmode = openfiles(system, kmemf, &kvmvars); 153 mode = getprof(&kvmvars); 154 if (hflag) 155 disp = GMON_PROF_OFF; 156 else if (bflag) 157 disp = GMON_PROF_ON; 158 else 159 disp = mode; 160 if (pflag) 161 dumpstate(&kvmvars); 162 if (rflag) 163 reset(&kvmvars); 164 if (accessmode == O_RDWR) 165 setprof(&kvmvars, disp); 166 (void)fprintf(stdout, "kgmon: kernel profiling is %s.\n", 167 disp == GMON_PROF_OFF ? "off" : "running"); 168 return (0); 169 } 170 171 /* 172 * Check that profiling is enabled and open any ncessary files. 173 */ 174 int 175 openfiles(system, kmemf, kvp) 176 char *system; 177 char *kmemf; 178 struct kvmvars *kvp; 179 { 180 int mib[3], state, openmode; 181 size_t size; 182 char errbuf[_POSIX2_LINE_MAX]; 183 184 if (!kflag) { 185 mib[0] = CTL_KERN; 186 mib[1] = KERN_PROF; 187 mib[2] = GPROF_STATE; 188 size = sizeof state; 189 if (sysctl(mib, 3, &state, &size, NULL, 0) < 0) { 190 (void)fprintf(stderr, 191 "kgmon: profiling not defined in kernel.\n"); 192 exit(20); 193 } 194 if (!(bflag || hflag || rflag || 195 (pflag && state == GMON_PROF_ON))) 196 return (O_RDONLY); 197 (void)seteuid(0); 198 if (sysctl(mib, 3, NULL, NULL, &state, size) >= 0) 199 return (O_RDWR); 200 (void)seteuid(getuid()); 201 kern_readonly(state); 202 return (O_RDONLY); 203 } 204 openmode = (bflag || hflag || pflag || rflag) ? O_RDWR : O_RDONLY; 205 kvp->kd = kvm_openfiles(system, kmemf, NULL, openmode, errbuf); 206 if (kvp->kd == NULL) { 207 if (openmode == O_RDWR) { 208 openmode = O_RDONLY; 209 kvp->kd = kvm_openfiles(system, kmemf, NULL, O_RDONLY, 210 errbuf); 211 } 212 if (kvp->kd == NULL) { 213 (void)fprintf(stderr, "kgmon: kvm_openfiles: %s\n", 214 errbuf); 215 exit(2); 216 } 217 kern_readonly(GMON_PROF_ON); 218 } 219 if (kvm_nlist(kvp->kd, nl) < 0) { 220 (void)fprintf(stderr, "kgmon: %s: no namelist\n", system); 221 exit(3); 222 } 223 if (!nl[N_GMONPARAM].n_value) { 224 (void)fprintf(stderr, 225 "kgmon: profiling not defined in kernel.\n"); 226 exit(20); 227 } 228 return (openmode); 229 } 230 231 /* 232 * Suppress options that require a writable kernel. 233 */ 234 void 235 kern_readonly(mode) 236 int mode; 237 { 238 239 (void)fprintf(stderr, "kgmon: kernel read-only: "); 240 if (pflag && mode == GMON_PROF_ON) 241 (void)fprintf(stderr, "data may be inconsistent\n"); 242 if (rflag) 243 (void)fprintf(stderr, "-r supressed\n"); 244 if (bflag) 245 (void)fprintf(stderr, "-b supressed\n"); 246 if (hflag) 247 (void)fprintf(stderr, "-h supressed\n"); 248 rflag = bflag = hflag = 0; 249 } 250 251 /* 252 * Get the state of kernel profiling. 253 */ 254 int 255 getprof(kvp) 256 struct kvmvars *kvp; 257 { 258 int mib[3]; 259 size_t size; 260 261 if (kflag) { 262 size = kvm_read(kvp->kd, nl[N_GMONPARAM].n_value, &kvp->gpm, 263 sizeof kvp->gpm); 264 } else { 265 mib[0] = CTL_KERN; 266 mib[1] = KERN_PROF; 267 mib[2] = GPROF_GMONPARAM; 268 size = sizeof kvp->gpm; 269 if (sysctl(mib, 3, &kvp->gpm, &size, NULL, 0) < 0) 270 size = 0; 271 } 272 if (size != sizeof kvp->gpm) { 273 (void)fprintf(stderr, "kgmon: cannot get gmonparam: %s\n", 274 kflag ? kvm_geterr(kvp->kd) : strerror(errno)); 275 exit (4); 276 } 277 return (kvp->gpm.state); 278 } 279 280 /* 281 * Enable or disable kernel profiling according to the state variable. 282 */ 283 void 284 setprof(kvp, state) 285 struct kvmvars *kvp; 286 int state; 287 { 288 struct gmonparam *p = (struct gmonparam *)nl[N_GMONPARAM].n_value; 289 int mib[3], oldstate; 290 size_t sz; 291 292 sz = sizeof(state); 293 if (!kflag) { 294 mib[0] = CTL_KERN; 295 mib[1] = KERN_PROF; 296 mib[2] = GPROF_STATE; 297 if (sysctl(mib, 3, &oldstate, &sz, NULL, 0) < 0) 298 goto bad; 299 if (oldstate == state) 300 return; 301 (void)seteuid(0); 302 if (sysctl(mib, 3, NULL, NULL, &state, sz) >= 0) { 303 (void)seteuid(getuid()); 304 return; 305 } 306 (void)seteuid(getuid()); 307 } else if (kvm_write(kvp->kd, (u_long)&p->state, (void *)&state, sz) 308 == sz) 309 return; 310 bad: 311 (void)fprintf(stderr, "kgmon: warning: cannot turn profiling %s\n", 312 state == GMON_PROF_OFF ? "off" : "on"); 313 } 314 315 /* 316 * Build the gmon.out file. 317 */ 318 void 319 dumpstate(kvp) 320 struct kvmvars *kvp; 321 { 322 register FILE *fp; 323 struct rawarc rawarc; 324 struct tostruct *tos; 325 u_long frompc; 326 u_short *froms, *tickbuf; 327 int mib[3]; 328 size_t i; 329 struct gmonhdr h; 330 int fromindex, endfrom, toindex; 331 332 setprof(kvp, GMON_PROF_OFF); 333 fp = fopen("gmon.out", "w"); 334 if (fp == 0) { 335 perror("gmon.out"); 336 return; 337 } 338 339 /* 340 * Build the gmon header and write it to a file. 341 */ 342 bzero(&h, sizeof(h)); 343 h.lpc = kvp->gpm.lowpc; 344 h.hpc = kvp->gpm.highpc; 345 h.ncnt = kvp->gpm.kcountsize + sizeof(h); 346 h.version = GMONVERSION; 347 h.profrate = getprofhz(kvp); 348 fwrite((char *)&h, sizeof(h), 1, fp); 349 350 /* 351 * Write out the tick buffer. 352 */ 353 mib[0] = CTL_KERN; 354 mib[1] = KERN_PROF; 355 if ((tickbuf = (u_short *)malloc(kvp->gpm.kcountsize)) == NULL) { 356 fprintf(stderr, "kgmon: cannot allocate kcount space\n"); 357 exit (5); 358 } 359 if (kflag) { 360 i = kvm_read(kvp->kd, (u_long)kvp->gpm.kcount, (void *)tickbuf, 361 kvp->gpm.kcountsize); 362 } else { 363 mib[2] = GPROF_COUNT; 364 i = kvp->gpm.kcountsize; 365 if (sysctl(mib, 3, tickbuf, &i, NULL, 0) < 0) 366 i = 0; 367 } 368 if (i != kvp->gpm.kcountsize) { 369 (void)fprintf(stderr, 370 "kgmon: read ticks: read %lu, got %lu: %s\n", 371 kvp->gpm.kcountsize, (u_long)i, 372 kflag ? kvm_geterr(kvp->kd) : strerror(errno)); 373 exit(6); 374 } 375 if ((fwrite(tickbuf, kvp->gpm.kcountsize, 1, fp)) != 1) { 376 perror("kgmon: writing tocks to gmon.out"); 377 exit(7); 378 } 379 free(tickbuf); 380 381 /* 382 * Write out the arc info. 383 */ 384 if ((froms = (u_short *)malloc(kvp->gpm.fromssize)) == NULL) { 385 fprintf(stderr, "kgmon: cannot allocate froms space\n"); 386 exit (8); 387 } 388 if (kflag) { 389 i = kvm_read(kvp->kd, (u_long)kvp->gpm.froms, (void *)froms, 390 kvp->gpm.fromssize); 391 } else { 392 mib[2] = GPROF_FROMS; 393 i = kvp->gpm.fromssize; 394 if (sysctl(mib, 3, froms, &i, NULL, 0) < 0) 395 i = 0; 396 } 397 if (i != kvp->gpm.fromssize) { 398 (void)fprintf(stderr, 399 "kgmon: read froms: read %lu, got %lu: %s\n", 400 kvp->gpm.fromssize, (u_long)i, 401 kflag ? kvm_geterr(kvp->kd) : strerror(errno)); 402 exit(9); 403 } 404 if ((tos = (struct tostruct *)malloc(kvp->gpm.tossize)) == NULL) { 405 fprintf(stderr, "kgmon: cannot allocate tos space\n"); 406 exit(10); 407 } 408 if (kflag) { 409 i = kvm_read(kvp->kd, (u_long)kvp->gpm.tos, (void *)tos, 410 kvp->gpm.tossize); 411 } else { 412 mib[2] = GPROF_TOS; 413 i = kvp->gpm.tossize; 414 if (sysctl(mib, 3, tos, &i, NULL, 0) < 0) 415 i = 0; 416 } 417 if (i != kvp->gpm.tossize) { 418 (void)fprintf(stderr, 419 "kgmon: read tos: read %lu, got %lu: %s\n", 420 kvp->gpm.tossize, (u_long)i, 421 kflag ? kvm_geterr(kvp->kd) : strerror(errno)); 422 exit(11); 423 } 424 if (debug) 425 (void)fprintf(stderr, "kgmon: lowpc 0x%lx, textsize 0x%lx\n", 426 kvp->gpm.lowpc, kvp->gpm.textsize); 427 endfrom = kvp->gpm.fromssize / sizeof(*froms); 428 for (fromindex = 0; fromindex < endfrom; ++fromindex) { 429 if (froms[fromindex] == 0) 430 continue; 431 frompc = (u_long)kvp->gpm.lowpc + 432 (fromindex * kvp->gpm.hashfraction * sizeof(*froms)); 433 for (toindex = froms[fromindex]; toindex != 0; 434 toindex = tos[toindex].link) { 435 if (debug) 436 (void)fprintf(stderr, 437 "%s: [mcleanup] frompc 0x%lx selfpc 0x%lx count %ld\n", 438 "kgmon", frompc, tos[toindex].selfpc, 439 tos[toindex].count); 440 rawarc.raw_frompc = frompc; 441 rawarc.raw_selfpc = (u_long)tos[toindex].selfpc; 442 rawarc.raw_count = tos[toindex].count; 443 fwrite((char *)&rawarc, sizeof(rawarc), 1, fp); 444 } 445 } 446 fclose(fp); 447 } 448 449 /* 450 * Get the profiling rate. 451 */ 452 int 453 getprofhz(kvp) 454 struct kvmvars *kvp; 455 { 456 int mib[2], profrate; 457 size_t size; 458 struct clockinfo clockrate; 459 460 if (kflag) { 461 profrate = 1; 462 if (kvm_read(kvp->kd, nl[N_PROFHZ].n_value, &profrate, 463 sizeof profrate) != sizeof profrate) 464 (void)fprintf(stderr, "kgmon: get clockrate: %s\n", 465 kvm_geterr(kvp->kd)); 466 return (profrate); 467 } 468 mib[0] = CTL_KERN; 469 mib[1] = KERN_CLOCKRATE; 470 clockrate.profhz = 1; 471 size = sizeof clockrate; 472 if (sysctl(mib, 2, &clockrate, &size, NULL, 0) < 0) 473 (void)fprintf(stderr, "kgmon: get clockrate: %s\n", 474 strerror(errno)); 475 return (clockrate.profhz); 476 } 477 478 /* 479 * Reset the kernel profiling date structures. 480 */ 481 void 482 reset(kvp) 483 struct kvmvars *kvp; 484 { 485 char *zbuf; 486 u_long biggest; 487 int mib[3]; 488 489 setprof(kvp, GMON_PROF_OFF); 490 491 biggest = kvp->gpm.kcountsize; 492 if (kvp->gpm.fromssize > biggest) 493 biggest = kvp->gpm.fromssize; 494 if (kvp->gpm.tossize > biggest) 495 biggest = kvp->gpm.tossize; 496 if ((zbuf = (char *)malloc(biggest)) == NULL) { 497 fprintf(stderr, "kgmon: cannot allocate zbuf space\n"); 498 exit(12); 499 } 500 bzero(zbuf, biggest); 501 if (kflag) { 502 if (kvm_write(kvp->kd, (u_long)kvp->gpm.kcount, zbuf, 503 kvp->gpm.kcountsize) != kvp->gpm.kcountsize) { 504 (void)fprintf(stderr, "kgmon: tickbuf zero: %s\n", 505 kvm_geterr(kvp->kd)); 506 exit(13); 507 } 508 if (kvm_write(kvp->kd, (u_long)kvp->gpm.froms, zbuf, 509 kvp->gpm.fromssize) != kvp->gpm.fromssize) { 510 (void)fprintf(stderr, "kgmon: froms zero: %s\n", 511 kvm_geterr(kvp->kd)); 512 exit(14); 513 } 514 if (kvm_write(kvp->kd, (u_long)kvp->gpm.tos, zbuf, 515 kvp->gpm.tossize) != kvp->gpm.tossize) { 516 (void)fprintf(stderr, "kgmon: tos zero: %s\n", 517 kvm_geterr(kvp->kd)); 518 exit(15); 519 } 520 return; 521 } 522 (void)seteuid(0); 523 mib[0] = CTL_KERN; 524 mib[1] = KERN_PROF; 525 mib[2] = GPROF_COUNT; 526 if (sysctl(mib, 3, NULL, NULL, zbuf, kvp->gpm.kcountsize) < 0) { 527 (void)fprintf(stderr, "kgmon: tickbuf zero: %s\n", 528 strerror(errno)); 529 exit(13); 530 } 531 mib[2] = GPROF_FROMS; 532 if (sysctl(mib, 3, NULL, NULL, zbuf, kvp->gpm.fromssize) < 0) { 533 (void)fprintf(stderr, "kgmon: froms zero: %s\n", 534 strerror(errno)); 535 exit(14); 536 } 537 mib[2] = GPROF_TOS; 538 if (sysctl(mib, 3, NULL, NULL, zbuf, kvp->gpm.tossize) < 0) { 539 (void)fprintf(stderr, "kgmon: tos zero: %s\n", 540 strerror(errno)); 541 exit(15); 542 } 543 (void)seteuid(getuid()); 544 free(zbuf); 545 } 546
Indexes created Sat Sep 27 14:09:57 GMT 2025