2 * Copyright (c) 1989, 1992, 1993
3 * The Regents of the University of California. All rights reserved.
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.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
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 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed by the University of
20 * California, Berkeley and its contributors.
21 * 4. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
39 #if defined(LIBC_SCCS) && !defined(lint)
40 static char sccsid[] = "@(#)kvm_proc.c 8.3 (Berkeley) 9/23/93";
41 #endif /* LIBC_SCCS and not lint */
44 #include <sys/cdefs.h>
45 __FBSDID("$FreeBSD$");
48 * Proc traversal interface for kvm. ps and w are (probably) the exclusive
49 * users of this code, so we've factored it out into a separate module.
50 * Thus, we keep this grunge out of the other kvm applications (i.e.,
51 * most other applications are interested only in open/close/read/nlist).
54 #include <sys/param.h>
55 #define _WANT_UCRED /* make ucred.h give us 'struct ucred' */
56 #include <sys/ucred.h>
57 #include <sys/queue.h>
58 #include <sys/_lock.h>
59 #include <sys/_mutex.h>
60 #include <sys/_task.h>
61 #define _WANT_PRISON /* make jail.h give us 'struct prison' */
67 #include <sys/sysent.h>
68 #include <sys/ioctl.h>
79 #include <vm/vm_param.h>
81 #include <sys/sysctl.h>
87 #include "kvm_private.h"
89 #define KREAD(kd, addr, obj) \
90 (kvm_read(kd, addr, (char *)(obj), sizeof(*obj)) != sizeof(*obj))
93 * Read proc's from memory file into buffer bp, which has space to hold
94 * at most maxcnt procs.
97 kvm_proclist(kd, what, arg, p, bp, maxcnt)
101 struct kinfo_proc *bp;
105 struct kinfo_proc kinfo_proc, *kp;
110 struct vmspace vmspace;
111 struct sigacts sigacts;
112 struct pstats pstats;
121 struct sysentvec sysent;
122 char svname[KI_EMULNAMELEN];
125 kp->ki_structsize = sizeof(kinfo_proc);
126 for (; cnt < maxcnt && p != NULL; p = LIST_NEXT(&proc, p_list)) {
127 memset(kp, 0, sizeof *kp);
128 if (KREAD(kd, (u_long)p, &proc)) {
129 _kvm_err(kd, kd->program, "can't read proc at %x", p);
132 if (proc.p_state != PRS_ZOMBIE) {
133 if (KREAD(kd, (u_long)TAILQ_FIRST(&proc.p_threads),
135 _kvm_err(kd, kd->program,
136 "can't read thread at %x",
137 TAILQ_FIRST(&proc.p_threads));
140 if ((proc.p_flag & P_SA) == 0) {
142 (u_long)TAILQ_FIRST(&proc.p_ksegrps),
144 _kvm_err(kd, kd->program,
145 "can't read ksegrp at %x",
146 TAILQ_FIRST(&proc.p_ksegrps));
151 (u_long)TAILQ_FIRST(&mkg.kg_kseq), &mke)) {
152 _kvm_err(kd, kd->program,
153 "can't read kse at %x",
154 TAILQ_FIRST(&mkg.kg_kseq));
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_ngroups = ucred.cr_ngroups;
166 bcopy(ucred.cr_groups, kp->ki_groups,
167 NGROUPS * sizeof(gid_t));
168 kp->ki_uid = ucred.cr_uid;
169 if (ucred.cr_prison != NULL) {
170 if (KREAD(kd, (u_long)ucred.cr_prison, &pr)) {
171 _kvm_err(kd, kd->program,
172 "can't read prison at %x",
176 kp->ki_jid = pr.pr_id;
180 switch(what & ~KERN_PROC_INC_THREAD) {
183 if (kp->ki_groups[0] != (gid_t)arg)
188 if (proc.p_pid != (pid_t)arg)
193 if (kp->ki_rgid != (gid_t)arg)
198 if (kp->ki_uid != (uid_t)arg)
203 if (kp->ki_ruid != (uid_t)arg)
208 * We're going to add another proc to the set. If this
209 * will overflow the buffer, assume the reason is because
210 * nprocs (or the proc list) is corrupt and declare an error.
213 _kvm_err(kd, kd->program, "nprocs corrupt");
220 kp->ki_addr = 0; /* XXX uarea */
221 /* kp->ki_kstack = proc.p_thread.td_kstack; XXXKSE */
222 kp->ki_args = proc.p_args;
223 kp->ki_tracep = proc.p_tracevp;
224 kp->ki_textvp = proc.p_textvp;
225 kp->ki_fd = proc.p_fd;
226 kp->ki_vmspace = proc.p_vmspace;
227 if (proc.p_sigacts != NULL) {
228 if (KREAD(kd, (u_long)proc.p_sigacts, &sigacts)) {
229 _kvm_err(kd, kd->program,
230 "can't read sigacts at %x", proc.p_sigacts);
233 kp->ki_sigignore = sigacts.ps_sigignore;
234 kp->ki_sigcatch = sigacts.ps_sigcatch;
236 if ((proc.p_sflag & PS_INMEM) && proc.p_stats != NULL) {
237 if (KREAD(kd, (u_long)proc.p_stats, &pstats)) {
238 _kvm_err(kd, kd->program,
239 "can't read stats at %x", proc.p_stats);
242 kp->ki_start = pstats.p_start;
245 * XXX: The times here are probably zero and need
246 * to be calculated from the raw data in p_rux and
249 kp->ki_rusage = pstats.p_ru;
250 kp->ki_childstime = pstats.p_cru.ru_stime;
251 kp->ki_childutime = pstats.p_cru.ru_utime;
252 /* Some callers want child-times in a single value */
253 timeradd(&kp->ki_childstime, &kp->ki_childutime,
257 kp->ki_ppid = proc.p_oppid;
258 else if (proc.p_pptr) {
259 if (KREAD(kd, (u_long)proc.p_pptr, &pproc)) {
260 _kvm_err(kd, kd->program,
261 "can't read pproc at %x", proc.p_pptr);
264 kp->ki_ppid = pproc.p_pid;
267 if (proc.p_pgrp == NULL)
269 if (KREAD(kd, (u_long)proc.p_pgrp, &pgrp)) {
270 _kvm_err(kd, kd->program, "can't read pgrp at %x",
274 kp->ki_pgid = pgrp.pg_id;
275 kp->ki_jobc = pgrp.pg_jobc;
276 if (KREAD(kd, (u_long)pgrp.pg_session, &sess)) {
277 _kvm_err(kd, kd->program, "can't read session at %x",
281 kp->ki_sid = sess.s_sid;
282 (void)memcpy(kp->ki_login, sess.s_login,
283 sizeof(kp->ki_login));
284 kp->ki_kiflag = sess.s_ttyvp ? KI_CTTY : 0;
285 if (sess.s_leader == p)
286 kp->ki_kiflag |= KI_SLEADER;
287 if ((proc.p_flag & P_CONTROLT) && sess.s_ttyp != NULL) {
288 if (KREAD(kd, (u_long)sess.s_ttyp, &tty)) {
289 _kvm_err(kd, kd->program,
290 "can't read tty at %x", sess.s_ttyp);
293 if (tty.t_dev != NULL) {
294 if (KREAD(kd, (u_long)tty.t_dev, &t_cdev)) {
295 _kvm_err(kd, kd->program,
296 "can't read cdev at %x",
301 kp->ki_tdev = t_cdev.si_udev;
306 if (tty.t_pgrp != NULL) {
307 if (KREAD(kd, (u_long)tty.t_pgrp, &pgrp)) {
308 _kvm_err(kd, kd->program,
309 "can't read tpgrp at %x",
313 kp->ki_tpgid = pgrp.pg_id;
316 if (tty.t_session != NULL) {
317 if (KREAD(kd, (u_long)tty.t_session, &sess)) {
318 _kvm_err(kd, kd->program,
319 "can't read session at %x",
323 kp->ki_tsid = sess.s_sid;
329 if ((proc.p_state != PRS_ZOMBIE) && mtd.td_wmesg)
330 (void)kvm_read(kd, (u_long)mtd.td_wmesg,
331 kp->ki_wmesg, WMESGLEN);
333 (void)kvm_read(kd, (u_long)proc.p_vmspace,
334 (char *)&vmspace, sizeof(vmspace));
335 kp->ki_size = vmspace.vm_map.size;
336 kp->ki_rssize = vmspace.vm_swrss; /* XXX */
337 kp->ki_swrss = vmspace.vm_swrss;
338 kp->ki_tsize = vmspace.vm_tsize;
339 kp->ki_dsize = vmspace.vm_dsize;
340 kp->ki_ssize = vmspace.vm_ssize;
342 switch (what & ~KERN_PROC_INC_THREAD) {
345 if (kp->ki_pgid != (pid_t)arg)
349 case KERN_PROC_SESSION:
350 if (kp->ki_sid != (pid_t)arg)
355 if ((proc.p_flag & P_CONTROLT) == 0 ||
356 kp->ki_tdev != (dev_t)arg)
360 if (proc.p_comm[0] != 0)
361 strlcpy(kp->ki_comm, proc.p_comm, MAXCOMLEN);
362 (void)kvm_read(kd, (u_long)proc.p_sysent, (char *)&sysent,
364 (void)kvm_read(kd, (u_long)sysent.sv_name, (char *)&svname,
367 strlcpy(kp->ki_emul, svname, KI_EMULNAMELEN);
368 if ((proc.p_state != PRS_ZOMBIE) &&
369 (mtd.td_blocked != 0)) {
370 kp->ki_kiflag |= KI_LOCKBLOCK;
373 (u_long)mtd.td_lockname,
374 kp->ki_lockname, LOCKNAMELEN);
375 kp->ki_lockname[LOCKNAMELEN] = 0;
377 bintime2timeval(&proc.p_rux.rux_runtime, &tv);
378 kp->ki_runtime = (u_int64_t)tv.tv_sec * 1000000 + tv.tv_usec;
379 kp->ki_pid = proc.p_pid;
380 kp->ki_siglist = proc.p_siglist;
381 SIGSETOR(kp->ki_siglist, mtd.td_siglist);
382 kp->ki_sigmask = mtd.td_sigmask;
383 kp->ki_xstat = proc.p_xstat;
384 kp->ki_acflag = proc.p_acflag;
385 kp->ki_lock = proc.p_lock;
386 if (proc.p_state != PRS_ZOMBIE) {
387 kp->ki_swtime = proc.p_swtime;
388 kp->ki_flag = proc.p_flag;
389 kp->ki_sflag = proc.p_sflag;
390 kp->ki_nice = proc.p_nice;
391 kp->ki_traceflag = proc.p_traceflag;
392 if (proc.p_state == PRS_NORMAL) {
393 if (TD_ON_RUNQ(&mtd) ||
395 TD_IS_RUNNING(&mtd)) {
397 } else if (mtd.td_state ==
399 if (P_SHOULDSTOP(&proc)) {
402 TD_IS_SLEEPING(&mtd)) {
403 kp->ki_stat = SSLEEP;
404 } else if (TD_ON_LOCK(&mtd)) {
413 /* Stuff from the thread */
414 kp->ki_pri.pri_level = mtd.td_priority;
415 kp->ki_pri.pri_native = mtd.td_base_pri;
416 kp->ki_lastcpu = mtd.td_lastcpu;
417 kp->ki_wchan = mtd.td_wchan;
418 kp->ki_oncpu = mtd.td_oncpu;
420 if (!(proc.p_flag & P_SA)) {
421 /* stuff from the ksegrp */
422 kp->ki_slptime = mkg.kg_slptime;
423 kp->ki_pri.pri_class = mkg.kg_pri_class;
424 kp->ki_pri.pri_user = mkg.kg_user_pri;
425 kp->ki_estcpu = mkg.kg_estcpu;
428 /* Stuff from the kse */
429 kp->ki_pctcpu = mke.ke_pctcpu;
430 kp->ki_rqindex = mke.ke_rqindex;
437 /* All the rest are 0 for now */
442 bcopy(&kinfo_proc, bp, sizeof(kinfo_proc));
450 * Build proc info array by reading in proc list from a crash dump.
451 * Return number of procs read. maxcnt is the max we will read.
454 kvm_deadprocs(kd, what, arg, a_allproc, a_zombproc, maxcnt)
461 struct kinfo_proc *bp = kd->procbase;
465 if (KREAD(kd, a_allproc, &p)) {
466 _kvm_err(kd, kd->program, "cannot read allproc");
469 acnt = kvm_proclist(kd, what, arg, p, bp, maxcnt);
473 if (KREAD(kd, a_zombproc, &p)) {
474 _kvm_err(kd, kd->program, "cannot read zombproc");
477 zcnt = kvm_proclist(kd, what, arg, p, bp + acnt, maxcnt - acnt);
481 return (acnt + zcnt);
485 kvm_getprocs(kd, op, arg, cnt)
490 int mib[4], st, nprocs;
494 if (kd->procbase != 0) {
495 free((void *)kd->procbase);
497 * Clear this pointer in case this call fails. Otherwise,
498 * kvm_close() will free it again.
508 temp_op = op & ~KERN_PROC_INC_THREAD;
510 temp_op == KERN_PROC_ALL || temp_op == KERN_PROC_PROC ?
511 3 : 4, NULL, &size, NULL, 0);
513 _kvm_syserr(kd, kd->program, "kvm_getprocs");
517 * We can't continue with a size of 0 because we pass
518 * it to realloc() (via _kvm_realloc()), and passing 0
519 * to realloc() results in undefined behavior.
523 * XXX: We should probably return an invalid,
524 * but non-NULL, pointer here so any client
525 * program trying to dereference it will
526 * crash. However, _kvm_freeprocs() calls
527 * free() on kd->procbase if it isn't NULL,
528 * and free()'ing a junk pointer isn't good.
529 * Then again, _kvm_freeprocs() isn't used
532 kd->procbase = _kvm_malloc(kd, 1);
537 kd->procbase = (struct kinfo_proc *)
538 _kvm_realloc(kd, kd->procbase, size);
539 if (kd->procbase == 0)
541 st = sysctl(mib, temp_op == KERN_PROC_ALL ||
542 temp_op == KERN_PROC_PROC ? 3 : 4,
543 kd->procbase, &size, NULL, 0);
544 } while (st == -1 && errno == ENOMEM);
546 _kvm_syserr(kd, kd->program, "kvm_getprocs");
550 * We have to check the size again because sysctl()
551 * may "round up" oldlenp if oldp is NULL; hence it
552 * might've told us that there was data to get when
553 * there really isn't any.
556 kd->procbase->ki_structsize != sizeof(struct kinfo_proc)) {
557 _kvm_err(kd, kd->program,
558 "kinfo_proc size mismatch (expected %d, got %d)",
559 sizeof(struct kinfo_proc),
560 kd->procbase->ki_structsize);
564 nprocs = size == 0 ? 0 : size / kd->procbase->ki_structsize;
566 struct nlist nl[4], *p;
568 nl[0].n_name = "_nprocs";
569 nl[1].n_name = "_allproc";
570 nl[2].n_name = "_zombproc";
573 if (kvm_nlist(kd, nl) != 0) {
574 for (p = nl; p->n_type != 0; ++p)
576 _kvm_err(kd, kd->program,
577 "%s: no such symbol", p->n_name);
580 if (KREAD(kd, nl[0].n_value, &nprocs)) {
581 _kvm_err(kd, kd->program, "can't read nprocs");
584 size = nprocs * sizeof(struct kinfo_proc);
585 kd->procbase = (struct kinfo_proc *)_kvm_malloc(kd, size);
586 if (kd->procbase == 0)
589 nprocs = kvm_deadprocs(kd, op, arg, nl[1].n_value,
590 nl[2].n_value, nprocs);
592 size = nprocs * sizeof(struct kinfo_proc);
593 (void)realloc(kd->procbase, size);
597 return (kd->procbase);
611 _kvm_realloc(kd, p, n)
616 void *np = (void *)realloc(p, n);
620 _kvm_err(kd, kd->program, "out of memory");
626 #define MAX(a, b) ((a) > (b) ? (a) : (b))
630 * Read in an argument vector from the user address space of process kp.
631 * addr if the user-space base address of narg null-terminated contiguous
632 * strings. This is used to read in both the command arguments and
633 * environment strings. Read at most maxcnt characters of strings.
636 kvm_argv(kd, kp, addr, narg, maxcnt)
638 struct kinfo_proc *kp;
643 char *np, *cp, *ep, *ap;
649 * Check that there aren't an unreasonable number of agruments,
650 * and that the address is in user space.
652 if (narg > 512 || addr < VM_MIN_ADDRESS || addr >= VM_MAXUSER_ADDRESS)
656 * kd->argv : work space for fetching the strings from the target
657 * process's space, and is converted for returning to caller
661 * Try to avoid reallocs.
663 kd->argc = MAX(narg + 1, 32);
664 kd->argv = (char **)_kvm_malloc(kd, kd->argc *
668 } else if (narg + 1 > kd->argc) {
669 kd->argc = MAX(2 * kd->argc, narg + 1);
670 kd->argv = (char **)_kvm_realloc(kd, kd->argv, kd->argc *
676 * kd->argspc : returned to user, this is where the kd->argv
677 * arrays are left pointing to the collected strings.
679 if (kd->argspc == 0) {
680 kd->argspc = (char *)_kvm_malloc(kd, PAGE_SIZE);
683 kd->arglen = PAGE_SIZE;
686 * kd->argbuf : used to pull in pages from the target process.
687 * the strings are copied out of here.
689 if (kd->argbuf == 0) {
690 kd->argbuf = (char *)_kvm_malloc(kd, PAGE_SIZE);
695 /* Pull in the target process'es argv vector */
696 cc = sizeof(char *) * narg;
697 if (kvm_uread(kd, kp, addr, (char *)kd->argv, cc) != cc)
700 * ap : saved start address of string we're working on in kd->argspc
701 * np : pointer to next place to write in kd->argspc
702 * len: length of data in kd->argspc
703 * argv: pointer to the argv vector that we are hunting around the
704 * target process space for, and converting to addresses in
705 * our address space (kd->argspc).
707 ap = np = kd->argspc;
711 * Loop over pages, filling in the argument vector.
712 * Note that the argv strings could be pointing *anywhere* in
713 * the user address space and are no longer contiguous.
714 * Note that *argv is modified when we are going to fetch a string
715 * that crosses a page boundary. We copy the next part of the string
716 * into to "np" and eventually convert the pointer.
718 while (argv < kd->argv + narg && *argv != 0) {
720 /* get the address that the current argv string is on */
721 addr = (u_long)*argv & ~(PAGE_SIZE - 1);
723 /* is it the same page as the last one? */
725 if (kvm_uread(kd, kp, addr, kd->argbuf, PAGE_SIZE) !=
731 /* offset within the page... kd->argbuf */
732 addr = (u_long)*argv & (PAGE_SIZE - 1);
734 /* cp = start of string, cc = count of chars in this chunk */
735 cp = kd->argbuf + addr;
736 cc = PAGE_SIZE - addr;
738 /* dont get more than asked for by user process */
739 if (maxcnt > 0 && cc > maxcnt - len)
742 /* pointer to end of string if we found it in this page */
743 ep = memchr(cp, '\0', cc);
747 * at this point, cc is the count of the chars that we are
748 * going to retrieve this time. we may or may not have found
749 * the end of it. (ep points to the null if the end is known)
752 /* will we exceed the malloc/realloced buffer? */
753 if (len + cc > kd->arglen) {
756 char *op = kd->argspc;
759 kd->argspc = (char *)_kvm_realloc(kd, kd->argspc,
764 * Adjust argv pointers in case realloc moved
767 off = kd->argspc - op;
768 for (pp = kd->argv; pp < argv; pp++)
773 /* np = where to put the next part of the string in kd->argspc*/
774 /* np is kinda redundant.. could use "kd->argspc + len" */
776 np += cc; /* inc counters */
780 * if end of string found, set the *argv pointer to the
781 * saved beginning of string, and advance. argv points to
782 * somewhere in kd->argv.. This is initially relative
783 * to the target process, but when we close it off, we set
784 * it to point in our address space.
790 /* update the address relative to the target process */
794 if (maxcnt > 0 && len >= maxcnt) {
796 * We're stopping prematurely. Terminate the
806 /* Make sure argv is terminated. */
813 struct ps_strings *p;
817 *addr = (u_long)p->ps_argvstr;
823 struct ps_strings *p;
827 *addr = (u_long)p->ps_envstr;
832 * Determine if the proc indicated by p is still active.
833 * This test is not 100% foolproof in theory, but chances of
834 * being wrong are very low.
838 struct kinfo_proc *curkp;
840 struct kinfo_proc newkp;
846 mib[2] = KERN_PROC_PID;
847 mib[3] = curkp->ki_pid;
849 if (sysctl(mib, 4, &newkp, &len, NULL, 0) == -1)
851 return (curkp->ki_pid == newkp.ki_pid &&
852 (newkp.ki_stat != SZOMB || curkp->ki_stat == SZOMB));
856 kvm_doargv(kd, kp, nchr, info)
858 struct kinfo_proc *kp;
860 void (*info)(struct ps_strings *, u_long *, int *);
865 static struct ps_strings arginfo;
866 static u_long ps_strings;
869 if (ps_strings == 0) {
870 len = sizeof(ps_strings);
871 if (sysctlbyname("kern.ps_strings", &ps_strings, &len, NULL,
873 ps_strings = PS_STRINGS;
877 * Pointers are stored at the top of the user stack.
879 if (kp->ki_stat == SZOMB ||
880 kvm_uread(kd, kp, ps_strings, (char *)&arginfo,
881 sizeof(arginfo)) != sizeof(arginfo))
884 (*info)(&arginfo, &addr, &cnt);
887 ap = kvm_argv(kd, kp, addr, cnt, nchr);
889 * For live kernels, make sure this process didn't go away.
891 if (ap != 0 && ISALIVE(kd) && !proc_verify(kp))
897 * Get the command args. This code is now machine independent.
900 kvm_getargv(kd, kp, nchr)
902 const struct kinfo_proc *kp;
908 static unsigned long buflen;
909 static char *buf, *p;
914 _kvm_err(kd, kd->program,
915 "cannot read user space from dead kernel");
920 bufsz = sizeof(buflen);
921 i = sysctlbyname("kern.ps_arg_cache_limit",
922 &buflen, &bufsz, NULL, 0);
926 buf = malloc(buflen);
930 bufp = malloc(sizeof(char *) * argc);
936 oid[2] = KERN_PROC_ARGS;
939 i = sysctl(oid, 4, buf, &bufsz, 0, 0);
940 if (i == 0 && bufsz > 0) {
949 sizeof(char *) * argc);
951 } while (p < buf + bufsz);
956 if (kp->ki_flag & P_SYSTEM)
958 return (kvm_doargv(kd, kp, nchr, ps_str_a));
962 kvm_getenvv(kd, kp, nchr)
964 const struct kinfo_proc *kp;
967 return (kvm_doargv(kd, kp, nchr, ps_str_e));
971 * Read from user space. The user context is given by p.
974 kvm_uread(kd, kp, uva, buf, len)
976 struct kinfo_proc *kp;
982 char procfile[MAXPATHLEN];
987 _kvm_err(kd, kd->program,
988 "cannot read user space from dead kernel");
992 sprintf(procfile, "/proc/%d/mem", kp->ki_pid);
993 fd = open(procfile, O_RDONLY, 0);
995 _kvm_err(kd, kd->program, "cannot open %s", procfile);
1002 if (lseek(fd, (off_t)uva, 0) == -1 && errno != 0) {
1003 _kvm_err(kd, kd->program, "invalid address (%x) in %s",
1007 amount = read(fd, cp, len);
1009 _kvm_syserr(kd, kd->program, "error reading %s",
1014 _kvm_err(kd, kd->program, "EOF reading %s", procfile);
1023 return ((ssize_t)(cp - buf));