1 /*- 2 * Copyright (c) 1989, 1992, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software developed by the Computer Systems 6 * Engineering group at Lawrence Berkeley Laboratory under DARPA contract 7 * BG 91-66 and contributed to Berkeley. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #if 0 35 #if defined(LIBC_SCCS) && !defined(lint) 36 static char sccsid[] = "@(#)kvm_proc.c 8.3 (Berkeley) 9/23/93"; 37 #endif /* LIBC_SCCS and not lint */ 38 #endif 39 40 #include <sys/cdefs.h> 41 __FBSDID("$FreeBSD$"); 42 43 /* 44 * Proc traversal interface for kvm. ps and w are (probably) the exclusive 45 * users of this code, so we've factored it out into a separate module. 46 * Thus, we keep this grunge out of the other kvm applications (i.e., 47 * most other applications are interested only in open/close/read/nlist). 48 */ 49 50 #include <sys/param.h> 51 #define _WANT_UCRED /* make ucred.h give us 'struct ucred' */ 52 #include <sys/ucred.h> 53 #include <sys/queue.h> 54 #include <sys/_lock.h> 55 #include <sys/_mutex.h> 56 #include <sys/_task.h> 57 #include <sys/cpuset.h> 58 #include <sys/user.h> 59 #include <sys/proc.h> 60 #define _WANT_PRISON /* make jail.h give us 'struct prison' */ 61 #include <sys/jail.h> 62 #include <sys/exec.h> 63 #include <sys/stat.h> 64 #include <sys/sysent.h> 65 #include <sys/ioctl.h> 66 #include <sys/tty.h> 67 #include <sys/file.h> 68 #include <sys/conf.h> 69 #define _WANT_KW_EXITCODE 70 #include <sys/wait.h> 71 #include <stdio.h> 72 #include <stdlib.h> 73 #include <unistd.h> 74 #include <nlist.h> 75 #include <kvm.h> 76 77 #include <sys/sysctl.h> 78 79 #include <limits.h> 80 #include <memory.h> 81 #include <paths.h> 82 83 #include "kvm_private.h" 84 85 #define KREAD(kd, addr, obj) \ 86 (kvm_read(kd, addr, (char *)(obj), sizeof(*obj)) != sizeof(*obj)) 87 88 static int ticks; 89 static int hz; 90 static uint64_t cpu_tick_frequency; 91 92 /* 93 * From sys/kern/kern_tc.c. Depends on cpu_tick_frequency, which is 94 * read/initialized before this function is ever called. 95 */ 96 static uint64_t 97 cputick2usec(uint64_t tick) 98 { 99 100 if (cpu_tick_frequency == 0) 101 return (0); 102 if (tick > 18446744073709551) /* floor(2^64 / 1000) */ 103 return (tick / (cpu_tick_frequency / 1000000)); 104 else if (tick > 18446744073709) /* floor(2^64 / 1000000) */ 105 return ((tick * 1000) / (cpu_tick_frequency / 1000)); 106 else 107 return ((tick * 1000000) / cpu_tick_frequency); 108 } 109 110 /* 111 * Read proc's from memory file into buffer bp, which has space to hold 112 * at most maxcnt procs. 113 */ 114 static int 115 kvm_proclist(kvm_t *kd, int what, int arg, struct proc *p, 116 struct kinfo_proc *bp, int maxcnt) 117 { 118 int cnt = 0; 119 struct kinfo_proc kinfo_proc, *kp; 120 struct pgrp pgrp; 121 struct session sess; 122 struct cdev t_cdev; 123 struct tty tty; 124 struct vmspace vmspace; 125 struct sigacts sigacts; 126 #if 0 127 struct pstats pstats; 128 #endif 129 struct ucred ucred; 130 struct prison pr; 131 struct thread mtd; 132 struct proc proc; 133 struct proc pproc; 134 struct sysentvec sysent; 135 char svname[KI_EMULNAMELEN]; 136 137 kp = &kinfo_proc; 138 kp->ki_structsize = sizeof(kinfo_proc); 139 /* 140 * Loop on the processes. this is completely broken because we need to be 141 * able to loop on the threads and merge the ones that are the same process some how. 142 */ 143 for (; cnt < maxcnt && p != NULL; p = LIST_NEXT(&proc, p_list)) { 144 memset(kp, 0, sizeof *kp); 145 if (KREAD(kd, (u_long)p, &proc)) { 146 _kvm_err(kd, kd->program, "can't read proc at %p", p); 147 return (-1); 148 } 149 if (proc.p_state == PRS_NEW) 150 continue; 151 if (proc.p_state != PRS_ZOMBIE) { 152 if (KREAD(kd, (u_long)TAILQ_FIRST(&proc.p_threads), 153 &mtd)) { 154 _kvm_err(kd, kd->program, 155 "can't read thread at %p", 156 TAILQ_FIRST(&proc.p_threads)); 157 return (-1); 158 } 159 } 160 if (KREAD(kd, (u_long)proc.p_ucred, &ucred) == 0) { 161 kp->ki_ruid = ucred.cr_ruid; 162 kp->ki_svuid = ucred.cr_svuid; 163 kp->ki_rgid = ucred.cr_rgid; 164 kp->ki_svgid = ucred.cr_svgid; 165 kp->ki_cr_flags = ucred.cr_flags; 166 if (ucred.cr_ngroups > KI_NGROUPS) { 167 kp->ki_ngroups = KI_NGROUPS; 168 kp->ki_cr_flags |= KI_CRF_GRP_OVERFLOW; 169 } else 170 kp->ki_ngroups = ucred.cr_ngroups; 171 kvm_read(kd, (u_long)ucred.cr_groups, kp->ki_groups, 172 kp->ki_ngroups * sizeof(gid_t)); 173 kp->ki_uid = ucred.cr_uid; 174 if (ucred.cr_prison != NULL) { 175 if (KREAD(kd, (u_long)ucred.cr_prison, &pr)) { 176 _kvm_err(kd, kd->program, 177 "can't read prison at %p", 178 ucred.cr_prison); 179 return (-1); 180 } 181 kp->ki_jid = pr.pr_id; 182 } 183 } 184 185 switch(what & ~KERN_PROC_INC_THREAD) { 186 187 case KERN_PROC_GID: 188 if (kp->ki_groups[0] != (gid_t)arg) 189 continue; 190 break; 191 192 case KERN_PROC_PID: 193 if (proc.p_pid != (pid_t)arg) 194 continue; 195 break; 196 197 case KERN_PROC_RGID: 198 if (kp->ki_rgid != (gid_t)arg) 199 continue; 200 break; 201 202 case KERN_PROC_UID: 203 if (kp->ki_uid != (uid_t)arg) 204 continue; 205 break; 206 207 case KERN_PROC_RUID: 208 if (kp->ki_ruid != (uid_t)arg) 209 continue; 210 break; 211 } 212 /* 213 * We're going to add another proc to the set. If this 214 * will overflow the buffer, assume the reason is because 215 * nprocs (or the proc list) is corrupt and declare an error. 216 */ 217 if (cnt >= maxcnt) { 218 _kvm_err(kd, kd->program, "nprocs corrupt"); 219 return (-1); 220 } 221 /* 222 * gather kinfo_proc 223 */ 224 kp->ki_paddr = p; 225 kp->ki_addr = 0; /* XXX uarea */ 226 /* kp->ki_kstack = proc.p_thread.td_kstack; XXXKSE */ 227 kp->ki_args = proc.p_args; 228 kp->ki_tracep = proc.p_tracevp; 229 kp->ki_textvp = proc.p_textvp; 230 kp->ki_fd = proc.p_fd; 231 kp->ki_vmspace = proc.p_vmspace; 232 if (proc.p_sigacts != NULL) { 233 if (KREAD(kd, (u_long)proc.p_sigacts, &sigacts)) { 234 _kvm_err(kd, kd->program, 235 "can't read sigacts at %p", proc.p_sigacts); 236 return (-1); 237 } 238 kp->ki_sigignore = sigacts.ps_sigignore; 239 kp->ki_sigcatch = sigacts.ps_sigcatch; 240 } 241 #if 0 242 if ((proc.p_flag & P_INMEM) && proc.p_stats != NULL) { 243 if (KREAD(kd, (u_long)proc.p_stats, &pstats)) { 244 _kvm_err(kd, kd->program, 245 "can't read stats at %x", proc.p_stats); 246 return (-1); 247 } 248 kp->ki_start = pstats.p_start; 249 250 /* 251 * XXX: The times here are probably zero and need 252 * to be calculated from the raw data in p_rux and 253 * p_crux. 254 */ 255 kp->ki_rusage = pstats.p_ru; 256 kp->ki_childstime = pstats.p_cru.ru_stime; 257 kp->ki_childutime = pstats.p_cru.ru_utime; 258 /* Some callers want child-times in a single value */ 259 timeradd(&kp->ki_childstime, &kp->ki_childutime, 260 &kp->ki_childtime); 261 } 262 #endif 263 if (proc.p_oppid) 264 kp->ki_ppid = proc.p_oppid; 265 else if (proc.p_pptr) { 266 if (KREAD(kd, (u_long)proc.p_pptr, &pproc)) { 267 _kvm_err(kd, kd->program, 268 "can't read pproc at %p", proc.p_pptr); 269 return (-1); 270 } 271 kp->ki_ppid = pproc.p_pid; 272 } else 273 kp->ki_ppid = 0; 274 if (proc.p_pgrp == NULL) 275 goto nopgrp; 276 if (KREAD(kd, (u_long)proc.p_pgrp, &pgrp)) { 277 _kvm_err(kd, kd->program, "can't read pgrp at %p", 278 proc.p_pgrp); 279 return (-1); 280 } 281 kp->ki_pgid = pgrp.pg_id; 282 kp->ki_jobc = pgrp.pg_jobc; 283 if (KREAD(kd, (u_long)pgrp.pg_session, &sess)) { 284 _kvm_err(kd, kd->program, "can't read session at %p", 285 pgrp.pg_session); 286 return (-1); 287 } 288 kp->ki_sid = sess.s_sid; 289 (void)memcpy(kp->ki_login, sess.s_login, 290 sizeof(kp->ki_login)); 291 kp->ki_kiflag = sess.s_ttyvp ? KI_CTTY : 0; 292 if (sess.s_leader == p) 293 kp->ki_kiflag |= KI_SLEADER; 294 if ((proc.p_flag & P_CONTROLT) && sess.s_ttyp != NULL) { 295 if (KREAD(kd, (u_long)sess.s_ttyp, &tty)) { 296 _kvm_err(kd, kd->program, 297 "can't read tty at %p", sess.s_ttyp); 298 return (-1); 299 } 300 if (tty.t_dev != NULL) { 301 if (KREAD(kd, (u_long)tty.t_dev, &t_cdev)) { 302 _kvm_err(kd, kd->program, 303 "can't read cdev at %p", 304 tty.t_dev); 305 return (-1); 306 } 307 #if 0 308 kp->ki_tdev = t_cdev.si_udev; 309 #else 310 kp->ki_tdev = NODEV; 311 #endif 312 } 313 if (tty.t_pgrp != NULL) { 314 if (KREAD(kd, (u_long)tty.t_pgrp, &pgrp)) { 315 _kvm_err(kd, kd->program, 316 "can't read tpgrp at %p", 317 tty.t_pgrp); 318 return (-1); 319 } 320 kp->ki_tpgid = pgrp.pg_id; 321 } else 322 kp->ki_tpgid = -1; 323 if (tty.t_session != NULL) { 324 if (KREAD(kd, (u_long)tty.t_session, &sess)) { 325 _kvm_err(kd, kd->program, 326 "can't read session at %p", 327 tty.t_session); 328 return (-1); 329 } 330 kp->ki_tsid = sess.s_sid; 331 } 332 } else { 333 nopgrp: 334 kp->ki_tdev = NODEV; 335 } 336 if ((proc.p_state != PRS_ZOMBIE) && mtd.td_wmesg) 337 (void)kvm_read(kd, (u_long)mtd.td_wmesg, 338 kp->ki_wmesg, WMESGLEN); 339 340 (void)kvm_read(kd, (u_long)proc.p_vmspace, 341 (char *)&vmspace, sizeof(vmspace)); 342 kp->ki_size = vmspace.vm_map.size; 343 /* 344 * Approximate the kernel's method of calculating 345 * this field. 346 */ 347 #define pmap_resident_count(pm) ((pm)->pm_stats.resident_count) 348 kp->ki_rssize = pmap_resident_count(&vmspace.vm_pmap); 349 kp->ki_swrss = vmspace.vm_swrss; 350 kp->ki_tsize = vmspace.vm_tsize; 351 kp->ki_dsize = vmspace.vm_dsize; 352 kp->ki_ssize = vmspace.vm_ssize; 353 354 switch (what & ~KERN_PROC_INC_THREAD) { 355 356 case KERN_PROC_PGRP: 357 if (kp->ki_pgid != (pid_t)arg) 358 continue; 359 break; 360 361 case KERN_PROC_SESSION: 362 if (kp->ki_sid != (pid_t)arg) 363 continue; 364 break; 365 366 case KERN_PROC_TTY: 367 if ((proc.p_flag & P_CONTROLT) == 0 || 368 kp->ki_tdev != (dev_t)arg) 369 continue; 370 break; 371 } 372 if (proc.p_comm[0] != 0) 373 strlcpy(kp->ki_comm, proc.p_comm, MAXCOMLEN); 374 (void)kvm_read(kd, (u_long)proc.p_sysent, (char *)&sysent, 375 sizeof(sysent)); 376 (void)kvm_read(kd, (u_long)sysent.sv_name, (char *)&svname, 377 sizeof(svname)); 378 if (svname[0] != 0) 379 strlcpy(kp->ki_emul, svname, KI_EMULNAMELEN); 380 if ((proc.p_state != PRS_ZOMBIE) && 381 (mtd.td_blocked != 0)) { 382 kp->ki_kiflag |= KI_LOCKBLOCK; 383 if (mtd.td_lockname) 384 (void)kvm_read(kd, 385 (u_long)mtd.td_lockname, 386 kp->ki_lockname, LOCKNAMELEN); 387 kp->ki_lockname[LOCKNAMELEN] = 0; 388 } 389 kp->ki_runtime = cputick2usec(proc.p_rux.rux_runtime); 390 kp->ki_pid = proc.p_pid; 391 kp->ki_siglist = proc.p_siglist; 392 SIGSETOR(kp->ki_siglist, mtd.td_siglist); 393 kp->ki_sigmask = mtd.td_sigmask; 394 kp->ki_xstat = KW_EXITCODE(proc.p_xexit, proc.p_xsig); 395 kp->ki_acflag = proc.p_acflag; 396 kp->ki_lock = proc.p_lock; 397 if (proc.p_state != PRS_ZOMBIE) { 398 kp->ki_swtime = (ticks - proc.p_swtick) / hz; 399 kp->ki_flag = proc.p_flag; 400 kp->ki_sflag = 0; 401 kp->ki_nice = proc.p_nice; 402 kp->ki_traceflag = proc.p_traceflag; 403 if (proc.p_state == PRS_NORMAL) { 404 if (TD_ON_RUNQ(&mtd) || 405 TD_CAN_RUN(&mtd) || 406 TD_IS_RUNNING(&mtd)) { 407 kp->ki_stat = SRUN; 408 } else if (mtd.td_state == 409 TDS_INHIBITED) { 410 if (P_SHOULDSTOP(&proc)) { 411 kp->ki_stat = SSTOP; 412 } else if ( 413 TD_IS_SLEEPING(&mtd)) { 414 kp->ki_stat = SSLEEP; 415 } else if (TD_ON_LOCK(&mtd)) { 416 kp->ki_stat = SLOCK; 417 } else { 418 kp->ki_stat = SWAIT; 419 } 420 } 421 } else { 422 kp->ki_stat = SIDL; 423 } 424 /* Stuff from the thread */ 425 kp->ki_pri.pri_level = mtd.td_priority; 426 kp->ki_pri.pri_native = mtd.td_base_pri; 427 kp->ki_lastcpu = mtd.td_lastcpu; 428 kp->ki_wchan = mtd.td_wchan; 429 if (mtd.td_name[0] != 0) 430 strlcpy(kp->ki_tdname, mtd.td_name, MAXCOMLEN); 431 kp->ki_oncpu = mtd.td_oncpu; 432 if (mtd.td_name[0] != '\0') 433 strlcpy(kp->ki_tdname, mtd.td_name, sizeof(kp->ki_tdname)); 434 kp->ki_pctcpu = 0; 435 kp->ki_rqindex = 0; 436 437 /* 438 * Note: legacy fields; wraps at NO_CPU_OLD or the 439 * old max CPU value as appropriate 440 */ 441 if (mtd.td_lastcpu == NOCPU) 442 kp->ki_lastcpu_old = NOCPU_OLD; 443 else if (mtd.td_lastcpu > MAXCPU_OLD) 444 kp->ki_lastcpu_old = MAXCPU_OLD; 445 else 446 kp->ki_lastcpu_old = mtd.td_lastcpu; 447 448 if (mtd.td_oncpu == NOCPU) 449 kp->ki_oncpu_old = NOCPU_OLD; 450 else if (mtd.td_oncpu > MAXCPU_OLD) 451 kp->ki_oncpu_old = MAXCPU_OLD; 452 else 453 kp->ki_oncpu_old = mtd.td_oncpu; 454 } else { 455 kp->ki_stat = SZOMB; 456 } 457 bcopy(&kinfo_proc, bp, sizeof(kinfo_proc)); 458 ++bp; 459 ++cnt; 460 } 461 return (cnt); 462 } 463 464 /* 465 * Build proc info array by reading in proc list from a crash dump. 466 * Return number of procs read. maxcnt is the max we will read. 467 */ 468 static int 469 kvm_deadprocs(kvm_t *kd, int what, int arg, u_long a_allproc, 470 u_long a_zombproc, int maxcnt) 471 { 472 struct kinfo_proc *bp = kd->procbase; 473 int acnt, zcnt; 474 struct proc *p; 475 476 if (KREAD(kd, a_allproc, &p)) { 477 _kvm_err(kd, kd->program, "cannot read allproc"); 478 return (-1); 479 } 480 acnt = kvm_proclist(kd, what, arg, p, bp, maxcnt); 481 if (acnt < 0) 482 return (acnt); 483 484 if (KREAD(kd, a_zombproc, &p)) { 485 _kvm_err(kd, kd->program, "cannot read zombproc"); 486 return (-1); 487 } 488 zcnt = kvm_proclist(kd, what, arg, p, bp + acnt, maxcnt - acnt); 489 if (zcnt < 0) 490 zcnt = 0; 491 492 return (acnt + zcnt); 493 } 494 495 struct kinfo_proc * 496 kvm_getprocs(kvm_t *kd, int op, int arg, int *cnt) 497 { 498 int mib[4], st, nprocs; 499 size_t size, osize; 500 int temp_op; 501 502 if (kd->procbase != 0) { 503 free((void *)kd->procbase); 504 /* 505 * Clear this pointer in case this call fails. Otherwise, 506 * kvm_close() will free it again. 507 */ 508 kd->procbase = 0; 509 } 510 if (ISALIVE(kd)) { 511 size = 0; 512 mib[0] = CTL_KERN; 513 mib[1] = KERN_PROC; 514 mib[2] = op; 515 mib[3] = arg; 516 temp_op = op & ~KERN_PROC_INC_THREAD; 517 st = sysctl(mib, 518 temp_op == KERN_PROC_ALL || temp_op == KERN_PROC_PROC ? 519 3 : 4, NULL, &size, NULL, 0); 520 if (st == -1) { 521 _kvm_syserr(kd, kd->program, "kvm_getprocs"); 522 return (0); 523 } 524 /* 525 * We can't continue with a size of 0 because we pass 526 * it to realloc() (via _kvm_realloc()), and passing 0 527 * to realloc() results in undefined behavior. 528 */ 529 if (size == 0) { 530 /* 531 * XXX: We should probably return an invalid, 532 * but non-NULL, pointer here so any client 533 * program trying to dereference it will 534 * crash. However, _kvm_freeprocs() calls 535 * free() on kd->procbase if it isn't NULL, 536 * and free()'ing a junk pointer isn't good. 537 * Then again, _kvm_freeprocs() isn't used 538 * anywhere . . . 539 */ 540 kd->procbase = _kvm_malloc(kd, 1); 541 goto liveout; 542 } 543 do { 544 size += size / 10; 545 kd->procbase = (struct kinfo_proc *) 546 _kvm_realloc(kd, kd->procbase, size); 547 if (kd->procbase == 0) 548 return (0); 549 osize = size; 550 st = sysctl(mib, temp_op == KERN_PROC_ALL || 551 temp_op == KERN_PROC_PROC ? 3 : 4, 552 kd->procbase, &size, NULL, 0); 553 } while (st == -1 && errno == ENOMEM && size == osize); 554 if (st == -1) { 555 _kvm_syserr(kd, kd->program, "kvm_getprocs"); 556 return (0); 557 } 558 /* 559 * We have to check the size again because sysctl() 560 * may "round up" oldlenp if oldp is NULL; hence it 561 * might've told us that there was data to get when 562 * there really isn't any. 563 */ 564 if (size > 0 && 565 kd->procbase->ki_structsize != sizeof(struct kinfo_proc)) { 566 _kvm_err(kd, kd->program, 567 "kinfo_proc size mismatch (expected %zu, got %d)", 568 sizeof(struct kinfo_proc), 569 kd->procbase->ki_structsize); 570 return (0); 571 } 572 liveout: 573 nprocs = size == 0 ? 0 : size / kd->procbase->ki_structsize; 574 } else { 575 struct nlist nl[7], *p; 576 577 nl[0].n_name = "_nprocs"; 578 nl[1].n_name = "_allproc"; 579 nl[2].n_name = "_zombproc"; 580 nl[3].n_name = "_ticks"; 581 nl[4].n_name = "_hz"; 582 nl[5].n_name = "_cpu_tick_frequency"; 583 nl[6].n_name = 0; 584 585 if (!kd->arch->ka_native(kd)) { 586 _kvm_err(kd, kd->program, 587 "cannot read procs from non-native core"); 588 return (0); 589 } 590 591 if (kvm_nlist(kd, nl) != 0) { 592 for (p = nl; p->n_type != 0; ++p) 593 ; 594 _kvm_err(kd, kd->program, 595 "%s: no such symbol", p->n_name); 596 return (0); 597 } 598 if (KREAD(kd, nl[0].n_value, &nprocs)) { 599 _kvm_err(kd, kd->program, "can't read nprocs"); 600 return (0); 601 } 602 if (KREAD(kd, nl[3].n_value, &ticks)) { 603 _kvm_err(kd, kd->program, "can't read ticks"); 604 return (0); 605 } 606 if (KREAD(kd, nl[4].n_value, &hz)) { 607 _kvm_err(kd, kd->program, "can't read hz"); 608 return (0); 609 } 610 if (KREAD(kd, nl[5].n_value, &cpu_tick_frequency)) { 611 _kvm_err(kd, kd->program, 612 "can't read cpu_tick_frequency"); 613 return (0); 614 } 615 size = nprocs * sizeof(struct kinfo_proc); 616 kd->procbase = (struct kinfo_proc *)_kvm_malloc(kd, size); 617 if (kd->procbase == 0) 618 return (0); 619 620 nprocs = kvm_deadprocs(kd, op, arg, nl[1].n_value, 621 nl[2].n_value, nprocs); 622 if (nprocs <= 0) { 623 _kvm_freeprocs(kd); 624 nprocs = 0; 625 } 626 #ifdef notdef 627 else { 628 size = nprocs * sizeof(struct kinfo_proc); 629 kd->procbase = realloc(kd->procbase, size); 630 } 631 #endif 632 } 633 *cnt = nprocs; 634 return (kd->procbase); 635 } 636 637 void 638 _kvm_freeprocs(kvm_t *kd) 639 { 640 if (kd->procbase) { 641 free(kd->procbase); 642 kd->procbase = 0; 643 } 644 } 645 646 void * 647 _kvm_realloc(kvm_t *kd, void *p, size_t n) 648 { 649 void *np = (void *)realloc(p, n); 650 651 if (np == 0) { 652 free(p); 653 _kvm_err(kd, kd->program, "out of memory"); 654 } 655 return (np); 656 } 657 658 /* 659 * Get the command args or environment. 660 */ 661 static char ** 662 kvm_argv(kvm_t *kd, const struct kinfo_proc *kp, int env, int nchr) 663 { 664 int oid[4]; 665 int i; 666 size_t bufsz; 667 static int buflen; 668 static char *buf, *p; 669 static char **bufp; 670 static int argc; 671 672 if (!ISALIVE(kd)) { 673 _kvm_err(kd, kd->program, 674 "cannot read user space from dead kernel"); 675 return (0); 676 } 677 678 if (nchr == 0 || nchr > ARG_MAX) 679 nchr = ARG_MAX; 680 if (buflen == 0) { 681 buf = malloc(nchr); 682 if (buf == NULL) { 683 _kvm_err(kd, kd->program, "cannot allocate memory"); 684 return (0); 685 } 686 buflen = nchr; 687 argc = 32; 688 bufp = malloc(sizeof(char *) * argc); 689 } else if (nchr > buflen) { 690 p = realloc(buf, nchr); 691 if (p != NULL) { 692 buf = p; 693 buflen = nchr; 694 } 695 } 696 oid[0] = CTL_KERN; 697 oid[1] = KERN_PROC; 698 oid[2] = env ? KERN_PROC_ENV : KERN_PROC_ARGS; 699 oid[3] = kp->ki_pid; 700 bufsz = buflen; 701 if (sysctl(oid, 4, buf, &bufsz, 0, 0) == -1) { 702 /* 703 * If the supplied buf is too short to hold the requested 704 * value the sysctl returns with ENOMEM. The buf is filled 705 * with the truncated value and the returned bufsz is equal 706 * to the requested len. 707 */ 708 if (errno != ENOMEM || bufsz != (size_t)buflen) 709 return (0); 710 buf[bufsz - 1] = '\0'; 711 errno = 0; 712 } else if (bufsz == 0) { 713 return (0); 714 } 715 i = 0; 716 p = buf; 717 do { 718 bufp[i++] = p; 719 p += strlen(p) + 1; 720 if (i >= argc) { 721 argc += argc; 722 bufp = realloc(bufp, 723 sizeof(char *) * argc); 724 } 725 } while (p < buf + bufsz); 726 bufp[i++] = 0; 727 return (bufp); 728 } 729 730 char ** 731 kvm_getargv(kvm_t *kd, const struct kinfo_proc *kp, int nchr) 732 { 733 return (kvm_argv(kd, kp, 0, nchr)); 734 } 735 736 char ** 737 kvm_getenvv(kvm_t *kd, const struct kinfo_proc *kp, int nchr) 738 { 739 return (kvm_argv(kd, kp, 1, nchr)); 740 } 741