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-rw-r--r--lib/libkvm/kvm_proc.c697
1 files changed, 697 insertions, 0 deletions
diff --git a/lib/libkvm/kvm_proc.c b/lib/libkvm/kvm_proc.c
new file mode 100644
index 0000000..d32575c
--- /dev/null
+++ b/lib/libkvm/kvm_proc.c
@@ -0,0 +1,697 @@
+/*-
+ * Copyright (c) 1989, 1992, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software developed by the Computer Systems
+ * Engineering group at Lawrence Berkeley Laboratory under DARPA contract
+ * BG 91-66 and contributed to Berkeley.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#if 0
+#if defined(LIBC_SCCS) && !defined(lint)
+static char sccsid[] = "@(#)kvm_proc.c 8.3 (Berkeley) 9/23/93";
+#endif /* LIBC_SCCS and not lint */
+#endif
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+/*
+ * Proc traversal interface for kvm. ps and w are (probably) the exclusive
+ * users of this code, so we've factored it out into a separate module.
+ * Thus, we keep this grunge out of the other kvm applications (i.e.,
+ * most other applications are interested only in open/close/read/nlist).
+ */
+
+#include <sys/param.h>
+#define _WANT_UCRED /* make ucred.h give us 'struct ucred' */
+#include <sys/ucred.h>
+#include <sys/queue.h>
+#include <sys/_lock.h>
+#include <sys/_mutex.h>
+#include <sys/_task.h>
+#include <sys/cpuset.h>
+#include <sys/user.h>
+#include <sys/proc.h>
+#define _WANT_PRISON /* make jail.h give us 'struct prison' */
+#include <sys/jail.h>
+#include <sys/exec.h>
+#include <sys/stat.h>
+#include <sys/sysent.h>
+#include <sys/ioctl.h>
+#include <sys/tty.h>
+#include <sys/file.h>
+#include <sys/conf.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <nlist.h>
+#include <kvm.h>
+
+#include <sys/sysctl.h>
+
+#include <limits.h>
+#include <memory.h>
+#include <paths.h>
+
+#include "kvm_private.h"
+
+#define KREAD(kd, addr, obj) \
+ (kvm_read(kd, addr, (char *)(obj), sizeof(*obj)) != sizeof(*obj))
+
+static int ticks;
+static int hz;
+static uint64_t cpu_tick_frequency;
+
+/*
+ * From sys/kern/kern_tc.c. Depends on cpu_tick_frequency, which is
+ * read/initialized before this function is ever called.
+ */
+static uint64_t
+cputick2usec(uint64_t tick)
+{
+
+ if (cpu_tick_frequency == 0)
+ return (0);
+ if (tick > 18446744073709551) /* floor(2^64 / 1000) */
+ return (tick / (cpu_tick_frequency / 1000000));
+ else if (tick > 18446744073709) /* floor(2^64 / 1000000) */
+ return ((tick * 1000) / (cpu_tick_frequency / 1000));
+ else
+ return ((tick * 1000000) / cpu_tick_frequency);
+}
+
+/*
+ * Read proc's from memory file into buffer bp, which has space to hold
+ * at most maxcnt procs.
+ */
+static int
+kvm_proclist(kvm_t *kd, int what, int arg, struct proc *p,
+ struct kinfo_proc *bp, int maxcnt)
+{
+ int cnt = 0;
+ struct kinfo_proc kinfo_proc, *kp;
+ struct pgrp pgrp;
+ struct session sess;
+ struct cdev t_cdev;
+ struct tty tty;
+ struct vmspace vmspace;
+ struct sigacts sigacts;
+#if 0
+ struct pstats pstats;
+#endif
+ struct ucred ucred;
+ struct prison pr;
+ struct thread mtd;
+ struct proc proc;
+ struct proc pproc;
+ struct sysentvec sysent;
+ char svname[KI_EMULNAMELEN];
+
+ kp = &kinfo_proc;
+ kp->ki_structsize = sizeof(kinfo_proc);
+ /*
+ * Loop on the processes. this is completely broken because we need to be
+ * able to loop on the threads and merge the ones that are the same process some how.
+ */
+ for (; cnt < maxcnt && p != NULL; p = LIST_NEXT(&proc, p_list)) {
+ memset(kp, 0, sizeof *kp);
+ if (KREAD(kd, (u_long)p, &proc)) {
+ _kvm_err(kd, kd->program, "can't read proc at %p", p);
+ return (-1);
+ }
+ if (proc.p_state != PRS_ZOMBIE) {
+ if (KREAD(kd, (u_long)TAILQ_FIRST(&proc.p_threads),
+ &mtd)) {
+ _kvm_err(kd, kd->program,
+ "can't read thread at %p",
+ TAILQ_FIRST(&proc.p_threads));
+ return (-1);
+ }
+ }
+ if (KREAD(kd, (u_long)proc.p_ucred, &ucred) == 0) {
+ kp->ki_ruid = ucred.cr_ruid;
+ kp->ki_svuid = ucred.cr_svuid;
+ kp->ki_rgid = ucred.cr_rgid;
+ kp->ki_svgid = ucred.cr_svgid;
+ kp->ki_cr_flags = ucred.cr_flags;
+ if (ucred.cr_ngroups > KI_NGROUPS) {
+ kp->ki_ngroups = KI_NGROUPS;
+ kp->ki_cr_flags |= KI_CRF_GRP_OVERFLOW;
+ } else
+ kp->ki_ngroups = ucred.cr_ngroups;
+ kvm_read(kd, (u_long)ucred.cr_groups, kp->ki_groups,
+ kp->ki_ngroups * sizeof(gid_t));
+ kp->ki_uid = ucred.cr_uid;
+ if (ucred.cr_prison != NULL) {
+ if (KREAD(kd, (u_long)ucred.cr_prison, &pr)) {
+ _kvm_err(kd, kd->program,
+ "can't read prison at %p",
+ ucred.cr_prison);
+ return (-1);
+ }
+ kp->ki_jid = pr.pr_id;
+ }
+ }
+
+ switch(what & ~KERN_PROC_INC_THREAD) {
+
+ case KERN_PROC_GID:
+ if (kp->ki_groups[0] != (gid_t)arg)
+ continue;
+ break;
+
+ case KERN_PROC_PID:
+ if (proc.p_pid != (pid_t)arg)
+ continue;
+ break;
+
+ case KERN_PROC_RGID:
+ if (kp->ki_rgid != (gid_t)arg)
+ continue;
+ break;
+
+ case KERN_PROC_UID:
+ if (kp->ki_uid != (uid_t)arg)
+ continue;
+ break;
+
+ case KERN_PROC_RUID:
+ if (kp->ki_ruid != (uid_t)arg)
+ continue;
+ break;
+ }
+ /*
+ * We're going to add another proc to the set. If this
+ * will overflow the buffer, assume the reason is because
+ * nprocs (or the proc list) is corrupt and declare an error.
+ */
+ if (cnt >= maxcnt) {
+ _kvm_err(kd, kd->program, "nprocs corrupt");
+ return (-1);
+ }
+ /*
+ * gather kinfo_proc
+ */
+ kp->ki_paddr = p;
+ kp->ki_addr = 0; /* XXX uarea */
+ /* kp->ki_kstack = proc.p_thread.td_kstack; XXXKSE */
+ kp->ki_args = proc.p_args;
+ kp->ki_tracep = proc.p_tracevp;
+ kp->ki_textvp = proc.p_textvp;
+ kp->ki_fd = proc.p_fd;
+ kp->ki_vmspace = proc.p_vmspace;
+ if (proc.p_sigacts != NULL) {
+ if (KREAD(kd, (u_long)proc.p_sigacts, &sigacts)) {
+ _kvm_err(kd, kd->program,
+ "can't read sigacts at %p", proc.p_sigacts);
+ return (-1);
+ }
+ kp->ki_sigignore = sigacts.ps_sigignore;
+ kp->ki_sigcatch = sigacts.ps_sigcatch;
+ }
+#if 0
+ if ((proc.p_flag & P_INMEM) && proc.p_stats != NULL) {
+ if (KREAD(kd, (u_long)proc.p_stats, &pstats)) {
+ _kvm_err(kd, kd->program,
+ "can't read stats at %x", proc.p_stats);
+ return (-1);
+ }
+ kp->ki_start = pstats.p_start;
+
+ /*
+ * XXX: The times here are probably zero and need
+ * to be calculated from the raw data in p_rux and
+ * p_crux.
+ */
+ kp->ki_rusage = pstats.p_ru;
+ kp->ki_childstime = pstats.p_cru.ru_stime;
+ kp->ki_childutime = pstats.p_cru.ru_utime;
+ /* Some callers want child-times in a single value */
+ timeradd(&kp->ki_childstime, &kp->ki_childutime,
+ &kp->ki_childtime);
+ }
+#endif
+ if (proc.p_oppid)
+ kp->ki_ppid = proc.p_oppid;
+ else if (proc.p_pptr) {
+ if (KREAD(kd, (u_long)proc.p_pptr, &pproc)) {
+ _kvm_err(kd, kd->program,
+ "can't read pproc at %p", proc.p_pptr);
+ return (-1);
+ }
+ kp->ki_ppid = pproc.p_pid;
+ } else
+ kp->ki_ppid = 0;
+ if (proc.p_pgrp == NULL)
+ goto nopgrp;
+ if (KREAD(kd, (u_long)proc.p_pgrp, &pgrp)) {
+ _kvm_err(kd, kd->program, "can't read pgrp at %p",
+ proc.p_pgrp);
+ return (-1);
+ }
+ kp->ki_pgid = pgrp.pg_id;
+ kp->ki_jobc = pgrp.pg_jobc;
+ if (KREAD(kd, (u_long)pgrp.pg_session, &sess)) {
+ _kvm_err(kd, kd->program, "can't read session at %p",
+ pgrp.pg_session);
+ return (-1);
+ }
+ kp->ki_sid = sess.s_sid;
+ (void)memcpy(kp->ki_login, sess.s_login,
+ sizeof(kp->ki_login));
+ kp->ki_kiflag = sess.s_ttyvp ? KI_CTTY : 0;
+ if (sess.s_leader == p)
+ kp->ki_kiflag |= KI_SLEADER;
+ if ((proc.p_flag & P_CONTROLT) && sess.s_ttyp != NULL) {
+ if (KREAD(kd, (u_long)sess.s_ttyp, &tty)) {
+ _kvm_err(kd, kd->program,
+ "can't read tty at %p", sess.s_ttyp);
+ return (-1);
+ }
+ if (tty.t_dev != NULL) {
+ if (KREAD(kd, (u_long)tty.t_dev, &t_cdev)) {
+ _kvm_err(kd, kd->program,
+ "can't read cdev at %p",
+ tty.t_dev);
+ return (-1);
+ }
+#if 0
+ kp->ki_tdev = t_cdev.si_udev;
+#else
+ kp->ki_tdev = NODEV;
+#endif
+ }
+ if (tty.t_pgrp != NULL) {
+ if (KREAD(kd, (u_long)tty.t_pgrp, &pgrp)) {
+ _kvm_err(kd, kd->program,
+ "can't read tpgrp at %p",
+ tty.t_pgrp);
+ return (-1);
+ }
+ kp->ki_tpgid = pgrp.pg_id;
+ } else
+ kp->ki_tpgid = -1;
+ if (tty.t_session != NULL) {
+ if (KREAD(kd, (u_long)tty.t_session, &sess)) {
+ _kvm_err(kd, kd->program,
+ "can't read session at %p",
+ tty.t_session);
+ return (-1);
+ }
+ kp->ki_tsid = sess.s_sid;
+ }
+ } else {
+nopgrp:
+ kp->ki_tdev = NODEV;
+ }
+ if ((proc.p_state != PRS_ZOMBIE) && mtd.td_wmesg)
+ (void)kvm_read(kd, (u_long)mtd.td_wmesg,
+ kp->ki_wmesg, WMESGLEN);
+
+ (void)kvm_read(kd, (u_long)proc.p_vmspace,
+ (char *)&vmspace, sizeof(vmspace));
+ kp->ki_size = vmspace.vm_map.size;
+ /*
+ * Approximate the kernel's method of calculating
+ * this field.
+ */
+#define pmap_resident_count(pm) ((pm)->pm_stats.resident_count)
+ kp->ki_rssize = pmap_resident_count(&vmspace.vm_pmap);
+ kp->ki_swrss = vmspace.vm_swrss;
+ kp->ki_tsize = vmspace.vm_tsize;
+ kp->ki_dsize = vmspace.vm_dsize;
+ kp->ki_ssize = vmspace.vm_ssize;
+
+ switch (what & ~KERN_PROC_INC_THREAD) {
+
+ case KERN_PROC_PGRP:
+ if (kp->ki_pgid != (pid_t)arg)
+ continue;
+ break;
+
+ case KERN_PROC_SESSION:
+ if (kp->ki_sid != (pid_t)arg)
+ continue;
+ break;
+
+ case KERN_PROC_TTY:
+ if ((proc.p_flag & P_CONTROLT) == 0 ||
+ kp->ki_tdev != (dev_t)arg)
+ continue;
+ break;
+ }
+ if (proc.p_comm[0] != 0)
+ strlcpy(kp->ki_comm, proc.p_comm, MAXCOMLEN);
+ (void)kvm_read(kd, (u_long)proc.p_sysent, (char *)&sysent,
+ sizeof(sysent));
+ (void)kvm_read(kd, (u_long)sysent.sv_name, (char *)&svname,
+ sizeof(svname));
+ if (svname[0] != 0)
+ strlcpy(kp->ki_emul, svname, KI_EMULNAMELEN);
+ if ((proc.p_state != PRS_ZOMBIE) &&
+ (mtd.td_blocked != 0)) {
+ kp->ki_kiflag |= KI_LOCKBLOCK;
+ if (mtd.td_lockname)
+ (void)kvm_read(kd,
+ (u_long)mtd.td_lockname,
+ kp->ki_lockname, LOCKNAMELEN);
+ kp->ki_lockname[LOCKNAMELEN] = 0;
+ }
+ kp->ki_runtime = cputick2usec(proc.p_rux.rux_runtime);
+ kp->ki_pid = proc.p_pid;
+ kp->ki_siglist = proc.p_siglist;
+ SIGSETOR(kp->ki_siglist, mtd.td_siglist);
+ kp->ki_sigmask = mtd.td_sigmask;
+ kp->ki_xstat = proc.p_xstat;
+ kp->ki_acflag = proc.p_acflag;
+ kp->ki_lock = proc.p_lock;
+ if (proc.p_state != PRS_ZOMBIE) {
+ kp->ki_swtime = (ticks - proc.p_swtick) / hz;
+ kp->ki_flag = proc.p_flag;
+ kp->ki_sflag = 0;
+ kp->ki_nice = proc.p_nice;
+ kp->ki_traceflag = proc.p_traceflag;
+ if (proc.p_state == PRS_NORMAL) {
+ if (TD_ON_RUNQ(&mtd) ||
+ TD_CAN_RUN(&mtd) ||
+ TD_IS_RUNNING(&mtd)) {
+ kp->ki_stat = SRUN;
+ } else if (mtd.td_state ==
+ TDS_INHIBITED) {
+ if (P_SHOULDSTOP(&proc)) {
+ kp->ki_stat = SSTOP;
+ } else if (
+ TD_IS_SLEEPING(&mtd)) {
+ kp->ki_stat = SSLEEP;
+ } else if (TD_ON_LOCK(&mtd)) {
+ kp->ki_stat = SLOCK;
+ } else {
+ kp->ki_stat = SWAIT;
+ }
+ }
+ } else {
+ kp->ki_stat = SIDL;
+ }
+ /* Stuff from the thread */
+ kp->ki_pri.pri_level = mtd.td_priority;
+ kp->ki_pri.pri_native = mtd.td_base_pri;
+ kp->ki_lastcpu = mtd.td_lastcpu;
+ kp->ki_wchan = mtd.td_wchan;
+ if (mtd.td_name[0] != 0)
+ strlcpy(kp->ki_tdname, mtd.td_name, MAXCOMLEN);
+ kp->ki_oncpu = mtd.td_oncpu;
+ if (mtd.td_name[0] != '\0')
+ strlcpy(kp->ki_tdname, mtd.td_name, sizeof(kp->ki_tdname));
+ kp->ki_pctcpu = 0;
+ kp->ki_rqindex = 0;
+ } else {
+ kp->ki_stat = SZOMB;
+ }
+ bcopy(&kinfo_proc, bp, sizeof(kinfo_proc));
+ ++bp;
+ ++cnt;
+ }
+ return (cnt);
+}
+
+/*
+ * Build proc info array by reading in proc list from a crash dump.
+ * Return number of procs read. maxcnt is the max we will read.
+ */
+static int
+kvm_deadprocs(kvm_t *kd, int what, int arg, u_long a_allproc,
+ u_long a_zombproc, int maxcnt)
+{
+ struct kinfo_proc *bp = kd->procbase;
+ int acnt, zcnt;
+ struct proc *p;
+
+ if (KREAD(kd, a_allproc, &p)) {
+ _kvm_err(kd, kd->program, "cannot read allproc");
+ return (-1);
+ }
+ acnt = kvm_proclist(kd, what, arg, p, bp, maxcnt);
+ if (acnt < 0)
+ return (acnt);
+
+ if (KREAD(kd, a_zombproc, &p)) {
+ _kvm_err(kd, kd->program, "cannot read zombproc");
+ return (-1);
+ }
+ zcnt = kvm_proclist(kd, what, arg, p, bp + acnt, maxcnt - acnt);
+ if (zcnt < 0)
+ zcnt = 0;
+
+ return (acnt + zcnt);
+}
+
+struct kinfo_proc *
+kvm_getprocs(kvm_t *kd, int op, int arg, int *cnt)
+{
+ int mib[4], st, nprocs;
+ size_t size;
+ int temp_op;
+
+ if (kd->procbase != 0) {
+ free((void *)kd->procbase);
+ /*
+ * Clear this pointer in case this call fails. Otherwise,
+ * kvm_close() will free it again.
+ */
+ kd->procbase = 0;
+ }
+ if (ISALIVE(kd)) {
+ size = 0;
+ mib[0] = CTL_KERN;
+ mib[1] = KERN_PROC;
+ mib[2] = op;
+ mib[3] = arg;
+ temp_op = op & ~KERN_PROC_INC_THREAD;
+ st = sysctl(mib,
+ temp_op == KERN_PROC_ALL || temp_op == KERN_PROC_PROC ?
+ 3 : 4, NULL, &size, NULL, 0);
+ if (st == -1) {
+ _kvm_syserr(kd, kd->program, "kvm_getprocs");
+ return (0);
+ }
+ /*
+ * We can't continue with a size of 0 because we pass
+ * it to realloc() (via _kvm_realloc()), and passing 0
+ * to realloc() results in undefined behavior.
+ */
+ if (size == 0) {
+ /*
+ * XXX: We should probably return an invalid,
+ * but non-NULL, pointer here so any client
+ * program trying to dereference it will
+ * crash. However, _kvm_freeprocs() calls
+ * free() on kd->procbase if it isn't NULL,
+ * and free()'ing a junk pointer isn't good.
+ * Then again, _kvm_freeprocs() isn't used
+ * anywhere . . .
+ */
+ kd->procbase = _kvm_malloc(kd, 1);
+ goto liveout;
+ }
+ do {
+ size += size / 10;
+ kd->procbase = (struct kinfo_proc *)
+ _kvm_realloc(kd, kd->procbase, size);
+ if (kd->procbase == 0)
+ return (0);
+ st = sysctl(mib, temp_op == KERN_PROC_ALL ||
+ temp_op == KERN_PROC_PROC ? 3 : 4,
+ kd->procbase, &size, NULL, 0);
+ } while (st == -1 && errno == ENOMEM);
+ if (st == -1) {
+ _kvm_syserr(kd, kd->program, "kvm_getprocs");
+ return (0);
+ }
+ /*
+ * We have to check the size again because sysctl()
+ * may "round up" oldlenp if oldp is NULL; hence it
+ * might've told us that there was data to get when
+ * there really isn't any.
+ */
+ if (size > 0 &&
+ kd->procbase->ki_structsize != sizeof(struct kinfo_proc)) {
+ _kvm_err(kd, kd->program,
+ "kinfo_proc size mismatch (expected %zu, got %d)",
+ sizeof(struct kinfo_proc),
+ kd->procbase->ki_structsize);
+ return (0);
+ }
+liveout:
+ nprocs = size == 0 ? 0 : size / kd->procbase->ki_structsize;
+ } else {
+ struct nlist nl[7], *p;
+
+ nl[0].n_name = "_nprocs";
+ nl[1].n_name = "_allproc";
+ nl[2].n_name = "_zombproc";
+ nl[3].n_name = "_ticks";
+ nl[4].n_name = "_hz";
+ nl[5].n_name = "_cpu_tick_frequency";
+ nl[6].n_name = 0;
+
+ if (kvm_nlist(kd, nl) != 0) {
+ for (p = nl; p->n_type != 0; ++p)
+ ;
+ _kvm_err(kd, kd->program,
+ "%s: no such symbol", p->n_name);
+ return (0);
+ }
+ if (KREAD(kd, nl[0].n_value, &nprocs)) {
+ _kvm_err(kd, kd->program, "can't read nprocs");
+ return (0);
+ }
+ if (KREAD(kd, nl[3].n_value, &ticks)) {
+ _kvm_err(kd, kd->program, "can't read ticks");
+ return (0);
+ }
+ if (KREAD(kd, nl[4].n_value, &hz)) {
+ _kvm_err(kd, kd->program, "can't read hz");
+ return (0);
+ }
+ if (KREAD(kd, nl[5].n_value, &cpu_tick_frequency)) {
+ _kvm_err(kd, kd->program,
+ "can't read cpu_tick_frequency");
+ return (0);
+ }
+ size = nprocs * sizeof(struct kinfo_proc);
+ kd->procbase = (struct kinfo_proc *)_kvm_malloc(kd, size);
+ if (kd->procbase == 0)
+ return (0);
+
+ nprocs = kvm_deadprocs(kd, op, arg, nl[1].n_value,
+ nl[2].n_value, nprocs);
+#ifdef notdef
+ size = nprocs * sizeof(struct kinfo_proc);
+ (void)realloc(kd->procbase, size);
+#endif
+ }
+ *cnt = nprocs;
+ return (kd->procbase);
+}
+
+void
+_kvm_freeprocs(kvm_t *kd)
+{
+ if (kd->procbase) {
+ free(kd->procbase);
+ kd->procbase = 0;
+ }
+}
+
+void *
+_kvm_realloc(kvm_t *kd, void *p, size_t n)
+{
+ void *np = (void *)realloc(p, n);
+
+ if (np == 0) {
+ free(p);
+ _kvm_err(kd, kd->program, "out of memory");
+ }
+ return (np);
+}
+
+/*
+ * Get the command args or environment.
+ */
+static char **
+kvm_argv(kvm_t *kd, const struct kinfo_proc *kp, int env, int nchr)
+{
+ int oid[4];
+ int i;
+ size_t bufsz;
+ static int buflen;
+ static char *buf, *p;
+ static char **bufp;
+ static int argc;
+
+ if (!ISALIVE(kd)) {
+ _kvm_err(kd, kd->program,
+ "cannot read user space from dead kernel");
+ return (0);
+ }
+
+ if (nchr == 0 || nchr > ARG_MAX)
+ nchr = ARG_MAX;
+ if (buflen == 0) {
+ buf = malloc(nchr);
+ if (buf == NULL) {
+ _kvm_err(kd, kd->program, "cannot allocate memory");
+ return (0);
+ }
+ buflen = nchr;
+ argc = 32;
+ bufp = malloc(sizeof(char *) * argc);
+ } else if (nchr > buflen) {
+ p = realloc(buf, nchr);
+ if (p != NULL) {
+ buf = p;
+ buflen = nchr;
+ }
+ }
+ if (buf != NULL) {
+ oid[0] = CTL_KERN;
+ oid[1] = KERN_PROC;
+ oid[2] = env ? KERN_PROC_ENV : KERN_PROC_ARGS;
+ oid[3] = kp->ki_pid;
+ bufsz = buflen;
+ i = sysctl(oid, 4, buf, &bufsz, 0, 0);
+ if (i == 0 && bufsz > 0) {
+ i = 0;
+ p = buf;
+ do {
+ bufp[i++] = p;
+ p += strlen(p) + 1;
+ if (i >= argc) {
+ argc += argc;
+ bufp = realloc(bufp,
+ sizeof(char *) * argc);
+ }
+ } while (p < buf + bufsz);
+ bufp[i++] = 0;
+ return (bufp);
+ }
+ }
+ return (NULL);
+}
+
+char **
+kvm_getargv(kvm_t *kd, const struct kinfo_proc *kp, int nchr)
+{
+ return (kvm_argv(kd, kp, 0, nchr));
+}
+
+char **
+kvm_getenvv(kvm_t *kd, const struct kinfo_proc *kp, int nchr)
+{
+ return (kvm_argv(kd, kp, 1, nchr));
+}
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