1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1989, 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software developed by the Computer Systems 8 * Engineering group at Lawrence Berkeley Laboratory under DARPA contract 9 * BG 91-66 and contributed to Berkeley. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. 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 #if 0 37 #if defined(LIBC_SCCS) && !defined(lint) 38 static char sccsid[] = "@(#)kvm_proc.c 8.3 (Berkeley) 9/23/93"; 39 #endif /* LIBC_SCCS and not lint */ 40 #endif 41 42 #include <sys/cdefs.h> 43 __FBSDID("$FreeBSD$"); 44 45 /* 46 * Proc traversal interface for kvm. ps and w are (probably) the exclusive 47 * users of this code, so we've factored it out into a separate module. 48 * Thus, we keep this grunge out of the other kvm applications (i.e., 49 * most other applications are interested only in open/close/read/nlist). 50 */ 51 52 #include <sys/param.h> 53 #define _WANT_UCRED /* make ucred.h give us 'struct ucred' */ 54 #include <sys/ucred.h> 55 #include <sys/queue.h> 56 #include <sys/_lock.h> 57 #include <sys/_mutex.h> 58 #include <sys/_task.h> 59 #include <sys/cpuset.h> 60 #include <sys/user.h> 61 #include <sys/proc.h> 62 #define _WANT_PRISON /* make jail.h give us 'struct prison' */ 63 #include <sys/jail.h> 64 #include <sys/exec.h> 65 #include <sys/stat.h> 66 #include <sys/sysent.h> 67 #include <sys/ioctl.h> 68 #include <sys/tty.h> 69 #include <sys/file.h> 70 #include <sys/conf.h> 71 #define _WANT_KW_EXITCODE 72 #include <sys/wait.h> 73 #include <stdio.h> 74 #include <stdlib.h> 75 #include <unistd.h> 76 #include <nlist.h> 77 #include <kvm.h> 78 79 #include <sys/sysctl.h> 80 81 #include <limits.h> 82 #include <memory.h> 83 #include <paths.h> 84 85 #include "kvm_private.h" 86 87 #define KREAD(kd, addr, obj) \ 88 (kvm_read(kd, addr, (char *)(obj), sizeof(*obj)) != sizeof(*obj)) 89 90 static int ticks; 91 static int hz; 92 static uint64_t cpu_tick_frequency; 93 94 /* 95 * From sys/kern/kern_tc.c. Depends on cpu_tick_frequency, which is 96 * read/initialized before this function is ever called. 97 */ 98 static uint64_t 99 cputick2usec(uint64_t tick) 100 { 101 102 if (cpu_tick_frequency == 0) 103 return (0); 104 if (tick > 18446744073709551) /* floor(2^64 / 1000) */ 105 return (tick / (cpu_tick_frequency / 1000000)); 106 else if (tick > 18446744073709) /* floor(2^64 / 1000000) */ 107 return ((tick * 1000) / (cpu_tick_frequency / 1000)); 108 else 109 return ((tick * 1000000) / cpu_tick_frequency); 110 } 111 112 /* 113 * Read proc's from memory file into buffer bp, which has space to hold 114 * at most maxcnt procs. 115 */ 116 static int 117 kvm_proclist(kvm_t *kd, int what, int arg, struct proc *p, 118 struct kinfo_proc *bp, int maxcnt) 119 { 120 int cnt = 0; 121 struct kinfo_proc kinfo_proc, *kp; 122 struct pgrp pgrp; 123 struct session sess; 124 struct cdev t_cdev; 125 struct tty tty; 126 struct vmspace vmspace; 127 struct sigacts sigacts; 128 #if 0 129 struct pstats pstats; 130 #endif 131 struct ucred ucred; 132 struct prison pr; 133 struct thread mtd; 134 struct proc proc; 135 struct proc pproc; 136 struct sysentvec sysent; 137 char svname[KI_EMULNAMELEN]; 138 139 kp = &kinfo_proc; 140 kp->ki_structsize = sizeof(kinfo_proc); 141 /* 142 * Loop on the processes. this is completely broken because we need to be 143 * able to loop on the threads and merge the ones that are the same process some how. 144 */ 145 for (; cnt < maxcnt && p != NULL; p = LIST_NEXT(&proc, p_list)) { 146 memset(kp, 0, sizeof *kp); 147 if (KREAD(kd, (u_long)p, &proc)) { 148 _kvm_err(kd, kd->program, "can't read proc at %p", p); 149 return (-1); 150 } 151 if (proc.p_state == PRS_NEW) 152 continue; 153 if (proc.p_state != PRS_ZOMBIE) { 154 if (KREAD(kd, (u_long)TAILQ_FIRST(&proc.p_threads), 155 &mtd)) { 156 _kvm_err(kd, kd->program, 157 "can't read thread at %p", 158 TAILQ_FIRST(&proc.p_threads)); 159 return (-1); 160 } 161 } 162 if (KREAD(kd, (u_long)proc.p_ucred, &ucred) == 0) { 163 kp->ki_ruid = ucred.cr_ruid; 164 kp->ki_svuid = ucred.cr_svuid; 165 kp->ki_rgid = ucred.cr_rgid; 166 kp->ki_svgid = ucred.cr_svgid; 167 kp->ki_cr_flags = ucred.cr_flags; 168 if (ucred.cr_ngroups > KI_NGROUPS) { 169 kp->ki_ngroups = KI_NGROUPS; 170 kp->ki_cr_flags |= KI_CRF_GRP_OVERFLOW; 171 } else 172 kp->ki_ngroups = ucred.cr_ngroups; 173 kvm_read(kd, (u_long)ucred.cr_groups, kp->ki_groups, 174 kp->ki_ngroups * sizeof(gid_t)); 175 kp->ki_uid = ucred.cr_uid; 176 if (ucred.cr_prison != NULL) { 177 if (KREAD(kd, (u_long)ucred.cr_prison, &pr)) { 178 _kvm_err(kd, kd->program, 179 "can't read prison at %p", 180 ucred.cr_prison); 181 return (-1); 182 } 183 kp->ki_jid = pr.pr_id; 184 } 185 } 186 187 switch(what & ~KERN_PROC_INC_THREAD) { 188 189 case KERN_PROC_GID: 190 if (kp->ki_groups[0] != (gid_t)arg) 191 continue; 192 break; 193 194 case KERN_PROC_PID: 195 if (proc.p_pid != (pid_t)arg) 196 continue; 197 break; 198 199 case KERN_PROC_RGID: 200 if (kp->ki_rgid != (gid_t)arg) 201 continue; 202 break; 203 204 case KERN_PROC_UID: 205 if (kp->ki_uid != (uid_t)arg) 206 continue; 207 break; 208 209 case KERN_PROC_RUID: 210 if (kp->ki_ruid != (uid_t)arg) 211 continue; 212 break; 213 } 214 /* 215 * We're going to add another proc to the set. If this 216 * will overflow the buffer, assume the reason is because 217 * nprocs (or the proc list) is corrupt and declare an error. 218 */ 219 if (cnt >= maxcnt) { 220 _kvm_err(kd, kd->program, "nprocs corrupt"); 221 return (-1); 222 } 223 /* 224 * gather kinfo_proc 225 */ 226 kp->ki_paddr = p; 227 kp->ki_addr = 0; /* XXX uarea */ 228 /* kp->ki_kstack = proc.p_thread.td_kstack; XXXKSE */ 229 kp->ki_args = proc.p_args; 230 kp->ki_tracep = proc.p_tracevp; 231 kp->ki_textvp = proc.p_textvp; 232 kp->ki_fd = proc.p_fd; 233 kp->ki_vmspace = proc.p_vmspace; 234 if (proc.p_sigacts != NULL) { 235 if (KREAD(kd, (u_long)proc.p_sigacts, &sigacts)) { 236 _kvm_err(kd, kd->program, 237 "can't read sigacts at %p", proc.p_sigacts); 238 return (-1); 239 } 240 kp->ki_sigignore = sigacts.ps_sigignore; 241 kp->ki_sigcatch = sigacts.ps_sigcatch; 242 } 243 #if 0 244 if ((proc.p_flag & P_INMEM) && proc.p_stats != NULL) { 245 if (KREAD(kd, (u_long)proc.p_stats, &pstats)) { 246 _kvm_err(kd, kd->program, 247 "can't read stats at %x", proc.p_stats); 248 return (-1); 249 } 250 kp->ki_start = pstats.p_start; 251 252 /* 253 * XXX: The times here are probably zero and need 254 * to be calculated from the raw data in p_rux and 255 * p_crux. 256 */ 257 kp->ki_rusage = pstats.p_ru; 258 kp->ki_childstime = pstats.p_cru.ru_stime; 259 kp->ki_childutime = pstats.p_cru.ru_utime; 260 /* Some callers want child-times in a single value */ 261 timeradd(&kp->ki_childstime, &kp->ki_childutime, 262 &kp->ki_childtime); 263 } 264 #endif 265 if (proc.p_oppid) 266 kp->ki_ppid = proc.p_oppid; 267 else if (proc.p_pptr) { 268 if (KREAD(kd, (u_long)proc.p_pptr, &pproc)) { 269 _kvm_err(kd, kd->program, 270 "can't read pproc at %p", proc.p_pptr); 271 return (-1); 272 } 273 kp->ki_ppid = pproc.p_pid; 274 } else 275 kp->ki_ppid = 0; 276 if (proc.p_pgrp == NULL) 277 goto nopgrp; 278 if (KREAD(kd, (u_long)proc.p_pgrp, &pgrp)) { 279 _kvm_err(kd, kd->program, "can't read pgrp at %p", 280 proc.p_pgrp); 281 return (-1); 282 } 283 kp->ki_pgid = pgrp.pg_id; 284 kp->ki_jobc = pgrp.pg_jobc; 285 if (KREAD(kd, (u_long)pgrp.pg_session, &sess)) { 286 _kvm_err(kd, kd->program, "can't read session at %p", 287 pgrp.pg_session); 288 return (-1); 289 } 290 kp->ki_sid = sess.s_sid; 291 (void)memcpy(kp->ki_login, sess.s_login, 292 sizeof(kp->ki_login)); 293 kp->ki_kiflag = sess.s_ttyvp ? KI_CTTY : 0; 294 if (sess.s_leader == p) 295 kp->ki_kiflag |= KI_SLEADER; 296 if ((proc.p_flag & P_CONTROLT) && sess.s_ttyp != NULL) { 297 if (KREAD(kd, (u_long)sess.s_ttyp, &tty)) { 298 _kvm_err(kd, kd->program, 299 "can't read tty at %p", sess.s_ttyp); 300 return (-1); 301 } 302 if (tty.t_dev != NULL) { 303 if (KREAD(kd, (u_long)tty.t_dev, &t_cdev)) { 304 _kvm_err(kd, kd->program, 305 "can't read cdev at %p", 306 tty.t_dev); 307 return (-1); 308 } 309 #if 0 310 kp->ki_tdev = t_cdev.si_udev; 311 #else 312 kp->ki_tdev = NODEV; 313 #endif 314 } 315 if (tty.t_pgrp != NULL) { 316 if (KREAD(kd, (u_long)tty.t_pgrp, &pgrp)) { 317 _kvm_err(kd, kd->program, 318 "can't read tpgrp at %p", 319 tty.t_pgrp); 320 return (-1); 321 } 322 kp->ki_tpgid = pgrp.pg_id; 323 } else 324 kp->ki_tpgid = -1; 325 if (tty.t_session != NULL) { 326 if (KREAD(kd, (u_long)tty.t_session, &sess)) { 327 _kvm_err(kd, kd->program, 328 "can't read session at %p", 329 tty.t_session); 330 return (-1); 331 } 332 kp->ki_tsid = sess.s_sid; 333 } 334 } else { 335 nopgrp: 336 kp->ki_tdev = NODEV; 337 } 338 if ((proc.p_state != PRS_ZOMBIE) && mtd.td_wmesg) 339 (void)kvm_read(kd, (u_long)mtd.td_wmesg, 340 kp->ki_wmesg, WMESGLEN); 341 342 (void)kvm_read(kd, (u_long)proc.p_vmspace, 343 (char *)&vmspace, sizeof(vmspace)); 344 kp->ki_size = vmspace.vm_map.size; 345 /* 346 * Approximate the kernel's method of calculating 347 * this field. 348 */ 349 #define pmap_resident_count(pm) ((pm)->pm_stats.resident_count) 350 kp->ki_rssize = pmap_resident_count(&vmspace.vm_pmap); 351 kp->ki_swrss = vmspace.vm_swrss; 352 kp->ki_tsize = vmspace.vm_tsize; 353 kp->ki_dsize = vmspace.vm_dsize; 354 kp->ki_ssize = vmspace.vm_ssize; 355 356 switch (what & ~KERN_PROC_INC_THREAD) { 357 358 case KERN_PROC_PGRP: 359 if (kp->ki_pgid != (pid_t)arg) 360 continue; 361 break; 362 363 case KERN_PROC_SESSION: 364 if (kp->ki_sid != (pid_t)arg) 365 continue; 366 break; 367 368 case KERN_PROC_TTY: 369 if ((proc.p_flag & P_CONTROLT) == 0 || 370 kp->ki_tdev != (dev_t)arg) 371 continue; 372 break; 373 } 374 if (proc.p_comm[0] != 0) 375 strlcpy(kp->ki_comm, proc.p_comm, MAXCOMLEN); 376 (void)kvm_read(kd, (u_long)proc.p_sysent, (char *)&sysent, 377 sizeof(sysent)); 378 (void)kvm_read(kd, (u_long)sysent.sv_name, (char *)&svname, 379 sizeof(svname)); 380 if (svname[0] != 0) 381 strlcpy(kp->ki_emul, svname, KI_EMULNAMELEN); 382 if ((proc.p_state != PRS_ZOMBIE) && 383 (mtd.td_blocked != 0)) { 384 kp->ki_kiflag |= KI_LOCKBLOCK; 385 if (mtd.td_lockname) 386 (void)kvm_read(kd, 387 (u_long)mtd.td_lockname, 388 kp->ki_lockname, LOCKNAMELEN); 389 kp->ki_lockname[LOCKNAMELEN] = 0; 390 } 391 kp->ki_runtime = cputick2usec(proc.p_rux.rux_runtime); 392 kp->ki_pid = proc.p_pid; 393 kp->ki_siglist = proc.p_siglist; 394 SIGSETOR(kp->ki_siglist, mtd.td_siglist); 395 kp->ki_sigmask = mtd.td_sigmask; 396 kp->ki_xstat = KW_EXITCODE(proc.p_xexit, proc.p_xsig); 397 kp->ki_acflag = proc.p_acflag; 398 kp->ki_lock = proc.p_lock; 399 if (proc.p_state != PRS_ZOMBIE) { 400 kp->ki_swtime = (ticks - proc.p_swtick) / hz; 401 kp->ki_flag = proc.p_flag; 402 kp->ki_sflag = 0; 403 kp->ki_nice = proc.p_nice; 404 kp->ki_traceflag = proc.p_traceflag; 405 if (proc.p_state == PRS_NORMAL) { 406 if (TD_ON_RUNQ(&mtd) || 407 TD_CAN_RUN(&mtd) || 408 TD_IS_RUNNING(&mtd)) { 409 kp->ki_stat = SRUN; 410 } else if (mtd.td_state == 411 TDS_INHIBITED) { 412 if (P_SHOULDSTOP(&proc)) { 413 kp->ki_stat = SSTOP; 414 } else if ( 415 TD_IS_SLEEPING(&mtd)) { 416 kp->ki_stat = SSLEEP; 417 } else if (TD_ON_LOCK(&mtd)) { 418 kp->ki_stat = SLOCK; 419 } else { 420 kp->ki_stat = SWAIT; 421 } 422 } 423 } else { 424 kp->ki_stat = SIDL; 425 } 426 /* Stuff from the thread */ 427 kp->ki_pri.pri_level = mtd.td_priority; 428 kp->ki_pri.pri_native = mtd.td_base_pri; 429 kp->ki_lastcpu = mtd.td_lastcpu; 430 kp->ki_wchan = mtd.td_wchan; 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 kp->ki_tdev_freebsd11 = kp->ki_tdev; /* truncate */ 458 bcopy(&kinfo_proc, bp, sizeof(kinfo_proc)); 459 ++bp; 460 ++cnt; 461 } 462 return (cnt); 463 } 464 465 /* 466 * Build proc info array by reading in proc list from a crash dump. 467 * Return number of procs read. maxcnt is the max we will read. 468 */ 469 static int 470 kvm_deadprocs(kvm_t *kd, int what, int arg, u_long a_allproc, 471 u_long a_zombproc, int maxcnt) 472 { 473 struct kinfo_proc *bp = kd->procbase; 474 int acnt, zcnt; 475 struct proc *p; 476 477 if (KREAD(kd, a_allproc, &p)) { 478 _kvm_err(kd, kd->program, "cannot read allproc"); 479 return (-1); 480 } 481 acnt = kvm_proclist(kd, what, arg, p, bp, maxcnt); 482 if (acnt < 0) 483 return (acnt); 484 485 if (KREAD(kd, a_zombproc, &p)) { 486 _kvm_err(kd, kd->program, "cannot read zombproc"); 487 return (-1); 488 } 489 zcnt = kvm_proclist(kd, what, arg, p, bp + acnt, maxcnt - acnt); 490 if (zcnt < 0) 491 zcnt = 0; 492 493 return (acnt + zcnt); 494 } 495 496 struct kinfo_proc * 497 kvm_getprocs(kvm_t *kd, int op, int arg, int *cnt) 498 { 499 int mib[4], st, nprocs; 500 size_t size, osize; 501 int temp_op; 502 503 if (kd->procbase != 0) { 504 free((void *)kd->procbase); 505 /* 506 * Clear this pointer in case this call fails. Otherwise, 507 * kvm_close() will free it again. 508 */ 509 kd->procbase = 0; 510 } 511 if (ISALIVE(kd)) { 512 size = 0; 513 mib[0] = CTL_KERN; 514 mib[1] = KERN_PROC; 515 mib[2] = op; 516 mib[3] = arg; 517 temp_op = op & ~KERN_PROC_INC_THREAD; 518 st = sysctl(mib, 519 temp_op == KERN_PROC_ALL || temp_op == KERN_PROC_PROC ? 520 3 : 4, NULL, &size, NULL, 0); 521 if (st == -1) { 522 _kvm_syserr(kd, kd->program, "kvm_getprocs"); 523 return (0); 524 } 525 /* 526 * We can't continue with a size of 0 because we pass 527 * it to realloc() (via _kvm_realloc()), and passing 0 528 * to realloc() results in undefined behavior. 529 */ 530 if (size == 0) { 531 /* 532 * XXX: We should probably return an invalid, 533 * but non-NULL, pointer here so any client 534 * program trying to dereference it will 535 * crash. However, _kvm_freeprocs() calls 536 * free() on kd->procbase if it isn't NULL, 537 * and free()'ing a junk pointer isn't good. 538 * Then again, _kvm_freeprocs() isn't used 539 * anywhere . . . 540 */ 541 kd->procbase = _kvm_malloc(kd, 1); 542 goto liveout; 543 } 544 do { 545 size += size / 10; 546 kd->procbase = (struct kinfo_proc *) 547 _kvm_realloc(kd, kd->procbase, size); 548 if (kd->procbase == NULL) 549 return (0); 550 osize = size; 551 st = sysctl(mib, temp_op == KERN_PROC_ALL || 552 temp_op == KERN_PROC_PROC ? 3 : 4, 553 kd->procbase, &size, NULL, 0); 554 } while (st == -1 && errno == ENOMEM && size == osize); 555 if (st == -1) { 556 _kvm_syserr(kd, kd->program, "kvm_getprocs"); 557 return (0); 558 } 559 /* 560 * We have to check the size again because sysctl() 561 * may "round up" oldlenp if oldp is NULL; hence it 562 * might've told us that there was data to get when 563 * there really isn't any. 564 */ 565 if (size > 0 && 566 kd->procbase->ki_structsize != sizeof(struct kinfo_proc)) { 567 _kvm_err(kd, kd->program, 568 "kinfo_proc size mismatch (expected %zu, got %d)", 569 sizeof(struct kinfo_proc), 570 kd->procbase->ki_structsize); 571 return (0); 572 } 573 liveout: 574 nprocs = size == 0 ? 0 : size / kd->procbase->ki_structsize; 575 } else { 576 struct nlist nl[7], *p; 577 578 nl[0].n_name = "_nprocs"; 579 nl[1].n_name = "_allproc"; 580 nl[2].n_name = "_zombproc"; 581 nl[3].n_name = "_ticks"; 582 nl[4].n_name = "_hz"; 583 nl[5].n_name = "_cpu_tick_frequency"; 584 nl[6].n_name = 0; 585 586 if (!kd->arch->ka_native(kd)) { 587 _kvm_err(kd, kd->program, 588 "cannot read procs from non-native core"); 589 return (0); 590 } 591 592 if (kvm_nlist(kd, nl) != 0) { 593 for (p = nl; p->n_type != 0; ++p) 594 ; 595 _kvm_err(kd, kd->program, 596 "%s: no such symbol", p->n_name); 597 return (0); 598 } 599 if (KREAD(kd, nl[0].n_value, &nprocs)) { 600 _kvm_err(kd, kd->program, "can't read nprocs"); 601 return (0); 602 } 603 if (KREAD(kd, nl[3].n_value, &ticks)) { 604 _kvm_err(kd, kd->program, "can't read ticks"); 605 return (0); 606 } 607 if (KREAD(kd, nl[4].n_value, &hz)) { 608 _kvm_err(kd, kd->program, "can't read hz"); 609 return (0); 610 } 611 if (KREAD(kd, nl[5].n_value, &cpu_tick_frequency)) { 612 _kvm_err(kd, kd->program, 613 "can't read cpu_tick_frequency"); 614 return (0); 615 } 616 size = nprocs * sizeof(struct kinfo_proc); 617 kd->procbase = (struct kinfo_proc *)_kvm_malloc(kd, size); 618 if (kd->procbase == NULL) 619 return (0); 620 621 nprocs = kvm_deadprocs(kd, op, arg, nl[1].n_value, 622 nl[2].n_value, nprocs); 623 if (nprocs <= 0) { 624 _kvm_freeprocs(kd); 625 nprocs = 0; 626 } 627 #ifdef notdef 628 else { 629 size = nprocs * sizeof(struct kinfo_proc); 630 kd->procbase = realloc(kd->procbase, size); 631 } 632 #endif 633 } 634 *cnt = nprocs; 635 return (kd->procbase); 636 } 637 638 void 639 _kvm_freeprocs(kvm_t *kd) 640 { 641 642 free(kd->procbase); 643 kd->procbase = NULL; 644 } 645 646 void * 647 _kvm_realloc(kvm_t *kd, void *p, size_t n) 648 { 649 void *np; 650 651 np = reallocf(p, n); 652 if (np == NULL) 653 _kvm_err(kd, kd->program, "out of memory"); 654 return (np); 655 } 656 657 /* 658 * Get the command args or environment. 659 */ 660 static char ** 661 kvm_argv(kvm_t *kd, const struct kinfo_proc *kp, int env, int nchr) 662 { 663 int oid[4]; 664 int i; 665 size_t bufsz; 666 static int buflen; 667 static char *buf, *p; 668 static char **bufp; 669 static int argc; 670 char **nbufp; 671 672 if (!ISALIVE(kd)) { 673 _kvm_err(kd, kd->program, 674 "cannot read user space from dead kernel"); 675 return (NULL); 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 (NULL); 685 } 686 argc = 32; 687 bufp = malloc(sizeof(char *) * argc); 688 if (bufp == NULL) { 689 free(buf); 690 buf = NULL; 691 _kvm_err(kd, kd->program, "cannot allocate memory"); 692 return (NULL); 693 } 694 buflen = nchr; 695 } else if (nchr > buflen) { 696 p = realloc(buf, nchr); 697 if (p != NULL) { 698 buf = p; 699 buflen = nchr; 700 } 701 } 702 oid[0] = CTL_KERN; 703 oid[1] = KERN_PROC; 704 oid[2] = env ? KERN_PROC_ENV : KERN_PROC_ARGS; 705 oid[3] = kp->ki_pid; 706 bufsz = buflen; 707 if (sysctl(oid, 4, buf, &bufsz, 0, 0) == -1) { 708 /* 709 * If the supplied buf is too short to hold the requested 710 * value the sysctl returns with ENOMEM. The buf is filled 711 * with the truncated value and the returned bufsz is equal 712 * to the requested len. 713 */ 714 if (errno != ENOMEM || bufsz != (size_t)buflen) 715 return (NULL); 716 buf[bufsz - 1] = '\0'; 717 errno = 0; 718 } else if (bufsz == 0) 719 return (NULL); 720 i = 0; 721 p = buf; 722 do { 723 bufp[i++] = p; 724 p += strlen(p) + 1; 725 if (i >= argc) { 726 argc += argc; 727 nbufp = realloc(bufp, sizeof(char *) * argc); 728 if (nbufp == NULL) 729 return (NULL); 730 bufp = nbufp; 731 } 732 } while (p < buf + bufsz); 733 bufp[i++] = 0; 734 return (bufp); 735 } 736 737 char ** 738 kvm_getargv(kvm_t *kd, const struct kinfo_proc *kp, int nchr) 739 { 740 return (kvm_argv(kd, kp, 0, nchr)); 741 } 742 743 char ** 744 kvm_getenvv(kvm_t *kd, const struct kinfo_proc *kp, int nchr) 745 { 746 return (kvm_argv(kd, kp, 1, nchr)); 747 } 748