/*      $NetBSD: kvm_proc.c,v 1.104 2026/03/31 04:11:13 yamt Exp $      */

/*-
 * Copyright (c) 1998 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Charles M. Hannum.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
 */

/*-
 * 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.
 * 3. 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.
 */

#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)kvm_proc.c  8.3 (Berkeley) 9/23/93";
#else
__RCSID("$NetBSD: kvm_proc.c,v 1.104 2026/03/31 04:11:13 yamt Exp $");
#endif
#endif /* LIBC_SCCS and not lint */

/*
 * 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>
#include <sys/lwp.h>
#include <sys/wait.h>
#include <sys/proc.h>
#include <sys/exec.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/tty.h>
#include <sys/resourcevar.h>
#include <sys/mutex.h>
#include <sys/specificdata.h>
#include <sys/types.h>

#include <errno.h>
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <unistd.h>
#include <nlist.h>
#include <kvm.h>

#include <uvm/uvm_extern.h>
#include <uvm/uvm_param.h>
#include <uvm/uvm_amap.h>
#include <uvm/uvm_page.h>

#include <sys/sysctl.h>

#include <limits.h>
#include <db.h>
#include <paths.h>

#include "kvm_private.h"

/*
 * Common info from kinfo_proc and kinfo_proc2 used by helper routines.
 */
struct miniproc {
        struct  vmspace *p_vmspace;
        char    p_stat;
        vaddr_t p_psstrp;
        struct  proc *p_paddr;
        pid_t   p_pid;
};

/*
 * Convert from struct proc and kinfo_proc to miniproc.
 */
#define KPTOMINI(kp, p) \
        do { \
                (p)->p_stat = (kp)->kp_proc.p_stat; \
                (p)->p_pid = (kp)->kp_proc.p_pid; \
                (p)->p_psstrp = (kp)->kp_proc.p_psstrp; \
                (p)->p_paddr = (kp)->kp_eproc.e_paddr; \
                (p)->p_vmspace = (kp)->kp_proc.p_vmspace; \
        } while (0)


/*
 * NetBSD uses kauth(9) to manage credentials, which are stored in kauth_cred_t,
 * a kernel-only opaque type. This is an embedded version which is *INTERNAL* to
 * kvm(3) so dumps can be read properly.
 *
 * Whenever NetBSD starts exporting credentials to userland consistently (using
 * 'struct uucred', or something) this will have to be updated again.
 */
struct kvm_kauth_cred {
        u_int cr_refcnt;                /* reference count */
#if COHERENCY_UNIT > 4
        uint8_t cr_pad[COHERENCY_UNIT - 4];
#endif
        uid_t cr_uid;                   /* user id */
        uid_t cr_euid;                  /* effective user id */
        uid_t cr_svuid;                 /* saved effective user id */
        gid_t cr_gid;                   /* group id */
        gid_t cr_egid;                  /* effective group id */
        gid_t cr_svgid;                 /* saved effective group id */
        u_int cr_ngroups;               /* number of groups */
        gid_t cr_groups[NGROUPS];       /* group memberships */
        specificdata_reference cr_sd;   /* specific data */
};

static char     *_kvm_ureadm(kvm_t *, const struct miniproc *, u_long,
                    u_long *);
static ssize_t  kvm_ureadm(kvm_t *, const struct miniproc *, u_long,
                    char *, size_t);

static char     **kvm_argv(kvm_t *, const struct miniproc *, u_long, int, int);
static int      kvm_deadprocs(kvm_t *, int, int, u_long, u_long, int);
static char     **kvm_doargv(kvm_t *, const struct miniproc *, int,
                    void (*)(struct ps_strings *, u_long *, int *));
static char     **kvm_doargv2(kvm_t *, pid_t, int, int);
static int      kvm_proclist(kvm_t *, int, int, struct proc *,
                    struct kinfo_proc *, int);
static int      proc_verify(kvm_t *, u_long, const struct miniproc *);
static void     ps_str_a(struct ps_strings *, u_long *, int *);
static void     ps_str_e(struct ps_strings *, u_long *, int *);


static char *
_kvm_ureadm(kvm_t *kd, const struct miniproc *p, u_long va, u_long *cnt)
{
        u_long addr, head;
        u_long offset;
        struct vm_map_entry vme;
        struct vm_amap amap;
        struct vm_anon *anonp, anon;
        struct vm_page pg;
        u_long slot;

        if (kd->swapspc == NULL) {
                kd->swapspc = _kvm_malloc(kd, (size_t)kd->nbpg);
                if (kd->swapspc == NULL)
                        return (NULL);
        }

        /*
         * Look through the address map for the memory object
         * that corresponds to the given virtual address.
         * The header just has the entire valid range.
         */
        head = (u_long)&p->p_vmspace->vm_map.header;
        addr = head;
        for (;;) {
                if (KREAD(kd, addr, &vme))
                        return (NULL);

                if (va >= vme.start && va < vme.end)
                        break;

                addr = (u_long)vme.next;
                if (addr == head)
                        return (NULL);
        }

        /*
         * we found the map entry, now to find the object...
         */
        if (vme.aref.ar_amap == NULL)
                return (NULL);

        addr = (u_long)vme.aref.ar_amap;
        if (KREAD(kd, addr, &amap))
                return (NULL);

        offset = va - vme.start;
        slot = offset / kd->nbpg + vme.aref.ar_pageoff;
        /* sanity-check slot number */
        if (slot > amap.am_nslot)
                return (NULL);

        addr = (u_long)amap.am_anon + slot * sizeof(anonp);
        if (KREAD(kd, addr, &anonp))
                return (NULL);

        addr = (u_long)anonp;
        if (KREAD(kd, addr, &anon))
                return (NULL);

        addr = (u_long)anon.an_page;
        if (addr) {
                if (KREAD(kd, addr, &pg))
                        return (NULL);

                if (_kvm_pread(kd, kd->pmfd, kd->swapspc, (size_t)kd->nbpg,
                    (off_t)pg.phys_addr & ~(kd->nbpg - 1)) != kd->nbpg)
                        return (NULL);
        } else {
                if (kd->swfd < 0 ||
                    _kvm_pread(kd, kd->swfd, kd->swapspc, (size_t)kd->nbpg,
                    ((off_t)anon.an_swslot * kd->nbpg)) != kd->nbpg)
                        return (NULL);
        }

        /* Found the page. */
        offset %= kd->nbpg;
        *cnt = kd->nbpg - offset;
        return (&kd->swapspc[(size_t)offset]);
}

/*
 * Convert credentials located in kernel space address 'cred' and store
 * them in the appropriate members of 'eproc'.
 */
static int
_kvm_convertcred(kvm_t *kd, u_long cred, struct eproc *eproc)
{
        struct kvm_kauth_cred kauthcred;
        struct ki_pcred *pc = &eproc->e_pcred;
        struct ki_ucred *uc = &eproc->e_ucred;

        if (KREAD(kd, cred, &kauthcred) != 0)
                return (-1);

        /* inlined version of kauth_cred_to_pcred, see kauth(9). */
        pc->p_ruid = kauthcred.cr_uid;
        pc->p_svuid = kauthcred.cr_svuid;
        pc->p_rgid = kauthcred.cr_gid;
        pc->p_svgid = kauthcred.cr_svgid;
        pc->p_refcnt = kauthcred.cr_refcnt;
        pc->p_pad = NULL;

        /* inlined version of kauth_cred_to_ucred(), see kauth(9). */
        uc->cr_ref = kauthcred.cr_refcnt;
        uc->cr_uid = kauthcred.cr_euid;
        uc->cr_gid = kauthcred.cr_egid;
        uc->cr_ngroups = (uint32_t)MIN(kauthcred.cr_ngroups,
            sizeof(uc->cr_groups) / sizeof(uc->cr_groups[0]));
        memcpy(uc->cr_groups, kauthcred.cr_groups,
            uc->cr_ngroups * sizeof(uc->cr_groups[0]));

        return (0);
}

/*
 * 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;
        int nlwps;
        struct kinfo_lwp *kl;
        struct eproc eproc;
        struct pgrp pgrp;
        struct session sess;
        struct tty tty;
        struct proc proc;

        for (; cnt < maxcnt && p != NULL; p = proc.p_list.le_next) {
                if (KREAD(kd, (u_long)p, &proc)) {
                        _kvm_err(kd, kd->program, "can't read proc at %p", p);
                        return (-1);
                }
                if (_kvm_convertcred(kd, (u_long)proc.p_cred, &eproc) != 0) {
                        _kvm_err(kd, kd->program,
                            "can't read proc credentials at %p", p);
                        return (-1);
                }

                switch (what) {

                case KERN_PROC_PID:
                        if (proc.p_pid != (pid_t)arg)
                                continue;
                        break;

                case KERN_PROC_UID:
                        if (eproc.e_ucred.cr_uid != (uid_t)arg)
                                continue;
                        break;

                case KERN_PROC_RUID:
                        if (eproc.e_pcred.p_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 eproc
                 */
                eproc.e_paddr = p;
                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);
                }
                eproc.e_sess = pgrp.pg_session;
                eproc.e_pgid = pgrp.pg_id;
                eproc.e_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);
                }
                if ((proc.p_lflag & PL_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);
                        }
                        eproc.e_tdev = (uint32_t)tty.t_dev;
                        eproc.e_tsess = tty.t_session;
                        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);
                                }
                                eproc.e_tpgid = pgrp.pg_id;
                        } else
                                eproc.e_tpgid = -1;
                } else
                        eproc.e_tdev = (uint32_t)NODEV;
                eproc.e_flag = sess.s_ttyvp ? EPROC_CTTY : 0;
                eproc.e_sid = sess.s_sid;
                if (sess.s_leader == p)
                        eproc.e_flag |= EPROC_SLEADER;
                /*
                 * Fill in the old-style proc.p_wmesg by copying the wmesg
                 * from the first available LWP.
                 */
                kl = kvm_getlwps(kd, proc.p_pid,
                    (u_long)PTRTOUINT64(eproc.e_paddr),
                    sizeof(struct kinfo_lwp), &nlwps);
                if (kl) {
                        if (nlwps > 0) {
                                strcpy(eproc.e_wmesg, kl[0].l_wmesg);
                        }
                }
                (void)kvm_read(kd, (u_long)proc.p_vmspace, &eproc.e_vm,
                    sizeof(eproc.e_vm));

                eproc.e_xsize = eproc.e_xrssize = 0;
                eproc.e_xccount = eproc.e_xswrss = 0;

                switch (what) {

                case KERN_PROC_PGRP:
                        if (eproc.e_pgid != (pid_t)arg)
                                continue;
                        break;

                case KERN_PROC_TTY:
                        if ((proc.p_lflag & PL_CONTROLT) == 0 ||
                            eproc.e_tdev != (dev_t)arg)
                                continue;
                        break;
                }
                memcpy(&bp->kp_proc, &proc, sizeof(proc));
                memcpy(&bp->kp_eproc, &eproc, sizeof(eproc));
                ++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_proc2 *
kvm_getproc2(kvm_t *kd, int op, int arg, size_t esize, int *cnt)
{
        size_t size;
        int mib[6], st, nprocs;
        struct pstats pstats;

        if (ISSYSCTL(kd)) {
                size = 0;
                mib[0] = CTL_KERN;
                mib[1] = KERN_PROC2;
                mib[2] = op;
                mib[3] = arg;
                mib[4] = (int)esize;
again:
                mib[5] = 0;
                st = sysctl(mib, 6, NULL, &size, NULL, (size_t)0);
                if (st == -1) {
                        _kvm_syserr(kd, kd->program, "kvm_getproc2");
                        return (NULL);
                }

                mib[5] = (int) (size / esize);
                KVM_ALLOC(kd, procbase2, size);
                st = sysctl(mib, 6, kd->procbase2, &size, NULL, (size_t)0);
                if (st == -1) {
                        if (errno == ENOMEM) {
                                goto again;
                        }
                        _kvm_syserr(kd, kd->program, "kvm_getproc2");
                        return (NULL);
                }
                nprocs = (int) (size / esize);
        } else {
                char *kp2c;
                struct kinfo_proc *kp;
                struct kinfo_proc2 kp2, *kp2p;
                struct kinfo_lwp *kl;
                int i, nlwps;

                kp = kvm_getprocs(kd, op, arg, &nprocs);
                if (kp == NULL)
                        return (NULL);

                size = nprocs * esize;
                KVM_ALLOC(kd, procbase2, size);
                kp2c = (char *)(void *)kd->procbase2;
                kp2p = &kp2;
                for (i = 0; i < nprocs; i++, kp++) {
                        struct timeval tv;

                        kl = kvm_getlwps(kd, kp->kp_proc.p_pid,
                            (u_long)PTRTOUINT64(kp->kp_eproc.e_paddr),
                            sizeof(struct kinfo_lwp), &nlwps);

                        if (kl == NULL) {
                                _kvm_syserr(kd, NULL,
                                        "kvm_getlwps() failed on process %u\n",
                                        kp->kp_proc.p_pid);
                                if (nlwps == 0)
                                        return NULL;
                                else
                                        continue;
                        }

                        /* We use kl[0] as the "representative" LWP */
                        memset(kp2p, 0, sizeof(kp2));
                        kp2p->p_forw = kl[0].l_forw;
                        kp2p->p_back = kl[0].l_back;
                        kp2p->p_paddr = PTRTOUINT64(kp->kp_eproc.e_paddr);
                        kp2p->p_addr = kl[0].l_addr;
                        kp2p->p_fd = PTRTOUINT64(kp->kp_proc.p_fd);
                        kp2p->p_cwdi = PTRTOUINT64(kp->kp_proc.p_cwdi);
                        kp2p->p_stats = PTRTOUINT64(kp->kp_proc.p_stats);
                        kp2p->p_limit = PTRTOUINT64(kp->kp_proc.p_limit);
                        kp2p->p_vmspace = PTRTOUINT64(kp->kp_proc.p_vmspace);
                        kp2p->p_sigacts = PTRTOUINT64(kp->kp_proc.p_sigacts);
                        kp2p->p_sess = PTRTOUINT64(kp->kp_eproc.e_sess);
                        kp2p->p_tsess = 0;
#if 1 /* XXX: dsl - p_ru was only ever non-zero for zombies */
                        kp2p->p_ru = 0;
#else
                        kp2p->p_ru = PTRTOUINT64(pstats.p_ru);
#endif

                        kp2p->p_eflag = 0;
                        kp2p->p_exitsig = kp->kp_proc.p_exitsig;
                        kp2p->p_flag = kp->kp_proc.p_flag;

                        kp2p->p_pid = kp->kp_proc.p_pid;

                        kp2p->p_ppid = kp->kp_eproc.e_ppid;
                        kp2p->p_sid = kp->kp_eproc.e_sid;
                        kp2p->p__pgid = kp->kp_eproc.e_pgid;

                        kp2p->p_tpgid = -1 /* XXX NO_PGID! */;

                        kp2p->p_uid = kp->kp_eproc.e_ucred.cr_uid;
                        kp2p->p_ruid = kp->kp_eproc.e_pcred.p_ruid;
                        kp2p->p_svuid = kp->kp_eproc.e_pcred.p_svuid;
                        kp2p->p_gid = kp->kp_eproc.e_ucred.cr_gid;
                        kp2p->p_rgid = kp->kp_eproc.e_pcred.p_rgid;
                        kp2p->p_svgid = kp->kp_eproc.e_pcred.p_svgid;

                        /*CONSTCOND*/
                        memcpy(kp2p->p_groups, kp->kp_eproc.e_ucred.cr_groups,
                            MIN(sizeof(kp2p->p_groups),
                            sizeof(kp->kp_eproc.e_ucred.cr_groups)));
                        kp2p->p_ngroups = kp->kp_eproc.e_ucred.cr_ngroups;

                        kp2p->p_jobc = kp->kp_eproc.e_jobc;
                        kp2p->p_tdev = kp->kp_eproc.e_tdev;
                        kp2p->p_tpgid = kp->kp_eproc.e_tpgid;
                        kp2p->p_tsess = PTRTOUINT64(kp->kp_eproc.e_tsess);

                        kp2p->p_estcpu = 0;
                        bintime2timeval(&kp->kp_proc.p_rtime, &tv);
                        kp2p->p_rtime_sec = (uint32_t)tv.tv_sec;
                        kp2p->p_rtime_usec = (uint32_t)tv.tv_usec;
                        kp2p->p_cpticks = kl[0].l_cpticks;
                        kp2p->p_pctcpu = kp->kp_proc.p_pctcpu;
                        kp2p->p_swtime = kl[0].l_swtime;
                        kp2p->p_slptime = kl[0].l_slptime;
#if 0 /* XXX thorpej */
                        kp2p->p_schedflags = kp->kp_proc.p_schedflags;
#else
                        kp2p->p_schedflags = 0;
#endif

                        kp2p->p_uticks = kp->kp_proc.p_uticks;
                        kp2p->p_sticks = kp->kp_proc.p_sticks;
                        kp2p->p_iticks = kp->kp_proc.p_iticks;

                        kp2p->p_tracep = PTRTOUINT64(kp->kp_proc.p_tracep);
                        kp2p->p_traceflag = kp->kp_proc.p_traceflag;

                        kp2p->p_holdcnt = kl[0].l_holdcnt;

                        memcpy(&kp2p->p_siglist,
                            &kp->kp_proc.p_sigpend.sp_set,
                            sizeof(ki_sigset_t));
                        memset(&kp2p->p_sigmask, 0,
                            sizeof(ki_sigset_t));
                        memcpy(&kp2p->p_sigignore,
                            &kp->kp_proc.p_sigctx.ps_sigignore,
                            sizeof(ki_sigset_t));
                        memcpy(&kp2p->p_sigcatch,
                            &kp->kp_proc.p_sigctx.ps_sigcatch,
                            sizeof(ki_sigset_t));

                        kp2p->p_stat = kl[0].l_stat;
                        kp2p->p_priority = kl[0].l_priority;
                        kp2p->p_usrpri = kl[0].l_priority;
                        kp2p->p_nice = kp->kp_proc.p_nice;

                        kp2p->p_xstat = P_WAITSTATUS(&kp->kp_proc);
                        kp2p->p_acflag = kp->kp_proc.p_acflag;

                        /*CONSTCOND*/
                        strncpy(kp2p->p_comm, kp->kp_proc.p_comm,
                            MIN(sizeof(kp2p->p_comm),
                            sizeof(kp->kp_proc.p_comm)));

                        strncpy(kp2p->p_wmesg, kp->kp_eproc.e_wmesg,
                            sizeof(kp2p->p_wmesg));
                        kp2p->p_wchan = kl[0].l_wchan;
                        strncpy(kp2p->p_login, kp->kp_eproc.e_login,
                            sizeof(kp2p->p_login));

                        kp2p->p_vm_rssize = kp->kp_eproc.e_xrssize;
                        kp2p->p_vm_tsize = kp->kp_eproc.e_vm.vm_tsize;
                        kp2p->p_vm_dsize = kp->kp_eproc.e_vm.vm_dsize;
                        kp2p->p_vm_ssize = kp->kp_eproc.e_vm.vm_ssize;
                        kp2p->p_vm_vsize = kp->kp_eproc.e_vm.vm_map.size
                            / kd->nbpg;
                        /* Adjust mapped size */
                        kp2p->p_vm_msize =
                            (kp->kp_eproc.e_vm.vm_map.size / kd->nbpg) -
                            kp->kp_eproc.e_vm.vm_issize +
                            kp->kp_eproc.e_vm.vm_ssize;

                        kp2p->p_eflag = (int32_t)kp->kp_eproc.e_flag;

                        kp2p->p_realflag = kp->kp_proc.p_flag;
                        kp2p->p_nlwps = kp->kp_proc.p_nlwps;
                        kp2p->p_nrlwps = kp->kp_proc.p_nrlwps;
                        kp2p->p_realstat = kp->kp_proc.p_stat;

                        if (P_ZOMBIE(&kp->kp_proc) ||
                            kp->kp_proc.p_stats == NULL ||
                            KREAD(kd, (u_long)kp->kp_proc.p_stats, &pstats)) {
                                kp2p->p_uvalid = 0;
                        } else {
                                kp2p->p_uvalid = 1;

                                kp2p->p_ustart_sec = (u_int32_t)
                                    pstats.p_start.tv_sec;
                                kp2p->p_ustart_usec = (u_int32_t)
                                    pstats.p_start.tv_usec;

                                kp2p->p_uutime_sec = (u_int32_t)
                                    pstats.p_ru.ru_utime.tv_sec;
                                kp2p->p_uutime_usec = (u_int32_t)
                                    pstats.p_ru.ru_utime.tv_usec;
                                kp2p->p_ustime_sec = (u_int32_t)
                                    pstats.p_ru.ru_stime.tv_sec;
                                kp2p->p_ustime_usec = (u_int32_t)
                                    pstats.p_ru.ru_stime.tv_usec;

                                kp2p->p_uru_maxrss = pstats.p_ru.ru_maxrss;
                                kp2p->p_uru_ixrss = pstats.p_ru.ru_ixrss;
                                kp2p->p_uru_idrss = pstats.p_ru.ru_idrss;
                                kp2p->p_uru_isrss = pstats.p_ru.ru_isrss;
                                kp2p->p_uru_minflt = pstats.p_ru.ru_minflt;
                                kp2p->p_uru_majflt = pstats.p_ru.ru_majflt;
                                kp2p->p_uru_nswap = pstats.p_ru.ru_nswap;
                                kp2p->p_uru_inblock = pstats.p_ru.ru_inblock;
                                kp2p->p_uru_oublock = pstats.p_ru.ru_oublock;
                                kp2p->p_uru_msgsnd = pstats.p_ru.ru_msgsnd;
                                kp2p->p_uru_msgrcv = pstats.p_ru.ru_msgrcv;
                                kp2p->p_uru_nsignals = pstats.p_ru.ru_nsignals;
                                kp2p->p_uru_nvcsw = pstats.p_ru.ru_nvcsw;
                                kp2p->p_uru_nivcsw = pstats.p_ru.ru_nivcsw;

                                kp2p->p_uctime_sec = (u_int32_t)
                                    (pstats.p_cru.ru_utime.tv_sec +
                                    pstats.p_cru.ru_stime.tv_sec);
                                kp2p->p_uctime_usec = (u_int32_t)
                                    (pstats.p_cru.ru_utime.tv_usec +
                                    pstats.p_cru.ru_stime.tv_usec);
                        }

                        memcpy(kp2c, &kp2, esize);
                        kp2c += esize;
                }
        }
        *cnt = nprocs;
        return (kd->procbase2);
}

struct kinfo_lwp *
kvm_getlwps(kvm_t *kd, int pid, u_long paddr, size_t esize, int *cnt)
{
        size_t size;
        int mib[5], nlwps;
        ssize_t st;
        struct kinfo_lwp *kl;

        if (ISSYSCTL(kd)) {
                size = 0;
                mib[0] = CTL_KERN;
                mib[1] = KERN_LWP;
                mib[2] = pid;
                mib[3] = (int)esize;
                mib[4] = 0;
again:
                st = sysctl(mib, 5, NULL, &size, NULL, (size_t)0);
                if (st == -1) {
                        switch (errno) {
                        case ESRCH: /* Treat this as a soft error; see kvm.c */
                                _kvm_syserr(kd, NULL, "kvm_getlwps");
                                return NULL;
                        default:
                                _kvm_syserr(kd, kd->program, "kvm_getlwps");
                                return NULL;
                        }
                }
                mib[4] = (int) (size / esize);
                KVM_ALLOC(kd, lwpbase, size);
                st = sysctl(mib, 5, kd->lwpbase, &size, NULL, (size_t)0);
                if (st == -1) {
                        switch (errno) {
                        case ESRCH: /* Treat this as a soft error; see kvm.c */
                                _kvm_syserr(kd, NULL, "kvm_getlwps");
                                return NULL;
                        case ENOMEM:
                                goto again;
                        default:
                                _kvm_syserr(kd, kd->program, "kvm_getlwps");
                                return NULL;
                        }
                }
                nlwps = (int) (size / esize);
        } else {
                /* grovel through the memory image */
                struct proc p;
                struct lwp l;
                u_long laddr;
                void *back;
                int i;

                st = kvm_read(kd, paddr, &p, sizeof(p));
                if (st == -1) {
                        _kvm_syserr(kd, kd->program, "kvm_getlwps");
                        return (NULL);
                }

                nlwps = p.p_nlwps;
                size = nlwps * sizeof(*kd->lwpbase);
                KVM_ALLOC(kd, lwpbase, size);
                laddr = (u_long)PTRTOUINT64(p.p_lwps.lh_first);
                for (i = 0; (i < nlwps) && (laddr != 0); i++) {
                        st = kvm_read(kd, laddr, &l, sizeof(l));
                        if (st == -1) {
                                _kvm_syserr(kd, kd->program, "kvm_getlwps");
                                return (NULL);
                        }
                        kl = &kd->lwpbase[i];
                        kl->l_laddr = laddr;
                        kl->l_forw = PTRTOUINT64(l.l_runq.tqe_next);
                        laddr = (u_long)PTRTOUINT64(l.l_runq.tqe_prev);
                        st = kvm_read(kd, laddr, &back, sizeof(back));
                        if (st == -1) {
                                _kvm_syserr(kd, kd->program, "kvm_getlwps");
                                return (NULL);
                        }
                        kl->l_back = PTRTOUINT64(back);
                        kl->l_addr = PTRTOUINT64(l.l_addr);
                        kl->l_lid = l.l_lid;
                        kl->l_flag = l.l_flag;
                        kl->l_swtime = l.l_swtime;
                        kl->l_slptime = l.l_slptime;
                        kl->l_schedflags = 0; /* XXX */
                        kl->l_holdcnt = 0;
                        kl->l_priority = l.l_priority;
                        kl->l_usrpri = l.l_priority;
                        kl->l_stat = l.l_stat;
                        kl->l_wchan = PTRTOUINT64(l.l_wchan);
                        if (l.l_wmesg)
                                (void)kvm_read(kd, (u_long)l.l_wmesg,
                                    kl->l_wmesg, (size_t)WMESGLEN);
                        kl->l_cpuid = KI_NOCPU;
                        laddr = (u_long)PTRTOUINT64(l.l_sibling.le_next);
                }
        }

        *cnt = nlwps;
        return (kd->lwpbase);
}

struct kinfo_proc *
kvm_getprocs(kvm_t *kd, int op, int arg, int *cnt)
{
        size_t size;
        int mib[4], st, nprocs;

        if (ISALIVE(kd)) {
                size = 0;
                mib[0] = CTL_KERN;
                mib[1] = KERN_PROC;
                mib[2] = op;
                mib[3] = arg;
                st = sysctl(mib, 4, NULL, &size, NULL, (size_t)0);
                if (st == -1) {
                        _kvm_syserr(kd, kd->program, "kvm_getprocs");
                        return (NULL);
                }
                KVM_ALLOC(kd, procbase, size);
                st = sysctl(mib, 4, kd->procbase, &size, NULL, (size_t)0);
                if (st == -1) {
                        _kvm_syserr(kd, kd->program, "kvm_getprocs");
                        return (NULL);
                }
                if (size % sizeof(struct kinfo_proc) != 0) {
                        _kvm_err(kd, kd->program,
                            "proc size mismatch (%lu total, %lu chunks)",
                            (u_long)size, (u_long)sizeof(struct kinfo_proc));
                        return (NULL);
                }
                nprocs = (int) (size / sizeof(struct kinfo_proc));
        } else {
                struct nlist nl[4], *p;

                (void)memset(nl, 0, sizeof(nl));
                nl[0].n_name = "_nprocs";
                nl[1].n_name = "_allproc";
                nl[2].n_name = "_zombproc";
                nl[3].n_name = NULL;

                if (kvm_nlist(kd, nl) != 0) {
                        for (p = nl; p->n_type != 0; ++p)
                                continue;
                        _kvm_err(kd, kd->program,
                            "%s: no such symbol", p->n_name);
                        return (NULL);
                }
                if (KREAD(kd, nl[0].n_value, &nprocs)) {
                        _kvm_err(kd, kd->program, "can't read nprocs");
                        return (NULL);
                }
                size = nprocs * sizeof(*kd->procbase);
                KVM_ALLOC(kd, procbase, size);
                nprocs = kvm_deadprocs(kd, op, arg, nl[1].n_value,
                    nl[2].n_value, nprocs);
                if (nprocs < 0)
                        return (NULL);
#ifdef notdef
                size = nprocs * sizeof(struct kinfo_proc);
                (void)realloc(kd->procbase, size);
#endif
        }
        *cnt = nprocs;
        return (kd->procbase);
}

void *
_kvm_realloc(kvm_t *kd, void *p, size_t n)
{
        void *np = realloc(p, n);

        if (np == NULL)
                _kvm_err(kd, kd->program, "out of memory");
        return (np);
}

/*
 * Read in an argument vector from the user address space of process p.
 * addr if the user-space base address of narg null-terminated contiguous
 * strings.  This is used to read in both the command arguments and
 * environment strings.  Read at most maxcnt characters of strings.
 */
static char **
kvm_argv(kvm_t *kd, const struct miniproc *p, u_long addr, int narg,
         int maxcnt)
{
        char *np, *cp, *ep, *ap;
        u_long oaddr = (u_long)~0L;
        u_long len;
        size_t cc;
        char **argv;

        /*
         * Check that there aren't an unreasonable number of arguments,
         * and that the address is in user space.
         */
        if (narg > ARG_MAX || addr < kd->min_uva || addr >= kd->max_uva)
                return (NULL);

        if (kd->argv == NULL) {
                /*
                 * Try to avoid reallocs.
                 */
                kd->argc = MAX(narg + 1, 32);
                kd->argv = _kvm_malloc(kd, kd->argc * sizeof(*kd->argv));
                if (kd->argv == NULL)
                        return (NULL);
        } else if (narg + 1 > kd->argc) {
                kd->argc = MAX(2 * kd->argc, narg + 1);
                kd->argv = _kvm_realloc(kd, kd->argv, kd->argc *
                    sizeof(*kd->argv));
                if (kd->argv == NULL)
                        return (NULL);
        }
        if (kd->argspc == NULL) {
                kd->argspc = _kvm_malloc(kd, (size_t)kd->nbpg);
                if (kd->argspc == NULL)
                        return (NULL);
                kd->argspc_len = kd->nbpg;
        }
        if (kd->argbuf == NULL) {
                kd->argbuf = _kvm_malloc(kd, (size_t)kd->nbpg);
                if (kd->argbuf == NULL)
                        return (NULL);
        }
        cc = sizeof(char *) * narg;
        if (kvm_ureadm(kd, p, addr, (void *)kd->argv, cc) != cc)
                return (NULL);
        ap = np = kd->argspc;
        argv = kd->argv;
        len = 0;
        /*
         * Loop over pages, filling in the argument vector.
         */
        while (argv < kd->argv + narg && *argv != NULL) {
                addr = (u_long)*argv & ~(kd->nbpg - 1);
                if (addr != oaddr) {
                        if (kvm_ureadm(kd, p, addr, kd->argbuf,
                            (size_t)kd->nbpg) != kd->nbpg)
                                return (NULL);
                        oaddr = addr;
                }
                addr = (u_long)*argv & (kd->nbpg - 1);
                cp = kd->argbuf + (size_t)addr;
                cc = kd->nbpg - (size_t)addr;
                if (maxcnt > 0 && cc > (size_t)(maxcnt - len))
                        cc = (size_t)(maxcnt - len);
                ep = memchr(cp, '\0', cc);
                if (ep != NULL)
                        cc = ep - cp + 1;
                if (len + cc > kd->argspc_len) {
                        ptrdiff_t off;
                        char **pp;
                        uintptr_t op = (uintptr_t)kd->argspc;

                        kd->argspc_len *= 2;
                        kd->argspc = _kvm_realloc(kd, kd->argspc,
                            kd->argspc_len);
                        if (kd->argspc == NULL)
                                return (NULL);
                        /*
                         * Adjust argv pointers in case realloc moved
                         * the string space.
                         */
                        off = (uintptr_t)kd->argspc - op;
                        for (pp = kd->argv; pp < argv; pp++)
                                *pp += off;
                        ap += off;
                        np += off;
                }
                memcpy(np, cp, cc);
                np += cc;
                len += cc;
                if (ep != NULL) {
                        *argv++ = ap;
                        ap = np;
                } else
                        *argv += cc;
                if (maxcnt > 0 && len >= maxcnt) {
                        /*
                         * We're stopping prematurely.  Terminate the
                         * current string.
                         */
                        if (ep == NULL) {
                                *np = '\0';
                                *argv++ = ap;
                        }
                        break;
                }
        }
        /* Make sure argv is terminated. */
        *argv = NULL;
        return (kd->argv);
}

static void
ps_str_a(struct ps_strings *p, u_long *addr, int *n)
{

        *addr = (u_long)p->ps_argvstr;
        *n = p->ps_nargvstr;
}

static void
ps_str_e(struct ps_strings *p, u_long *addr, int *n)
{

        *addr = (u_long)p->ps_envstr;
        *n = p->ps_nenvstr;
}

/*
 * Determine if the proc indicated by p is still active.
 * This test is not 100% foolproof in theory, but chances of
 * being wrong are very low.
 */
static int
proc_verify(kvm_t *kd, u_long kernp, const struct miniproc *p)
{
        struct proc kernproc;

        /*
         * Just read in the whole proc.  It's not that big relative
         * to the cost of the read system call.
         */
        if (kvm_read(kd, kernp, &kernproc, sizeof(kernproc)) !=
            sizeof(kernproc))
                return (0);
        return (p->p_pid == kernproc.p_pid &&
            (kernproc.p_stat != SZOMB || p->p_stat == SZOMB));
}

static char **
kvm_doargv(kvm_t *kd, const struct miniproc *p, int nchr,
           void (*info)(struct ps_strings *, u_long *, int *))
{
        char **ap;
        u_long addr;
        int cnt;
        struct ps_strings arginfo;

        /*
         * Pointers are stored at the top of the user stack.
         */
        if (p->p_stat == SZOMB)
                return (NULL);
        cnt = (int)kvm_ureadm(kd, p, p->p_psstrp,
            (void *)&arginfo, sizeof(arginfo));
        if (cnt != sizeof(arginfo))
                return (NULL);

        (*info)(&arginfo, &addr, &cnt);
        if (cnt == 0)
                return (NULL);
        ap = kvm_argv(kd, p, addr, cnt, nchr);
        /*
         * For live kernels, make sure this process didn't go away.
         */
        if (ap != NULL && ISALIVE(kd) &&
            !proc_verify(kd, (u_long)p->p_paddr, p))
                ap = NULL;
        return (ap);
}

/*
 * Get the command args.  This code is now machine independent.
 */
char **
kvm_getargv(kvm_t *kd, const struct kinfo_proc *kp, int nchr)
{
        struct miniproc p;

        KPTOMINI(kp, &p);
        return (kvm_doargv(kd, &p, nchr, ps_str_a));
}

char **
kvm_getenvv(kvm_t *kd, const struct kinfo_proc *kp, int nchr)
{
        struct miniproc p;

        KPTOMINI(kp, &p);
        return (kvm_doargv(kd, &p, nchr, ps_str_e));
}

static char **
kvm_doargv2(kvm_t *kd, pid_t pid, int type, int nchr)
{
        size_t bufs;
        int narg, mib[4];
        size_t newargspc_len;
        char **ap, *bp, *endp;

        /*
         * Check that there aren't an unreasonable number of arguments.
         */
        if (nchr > ARG_MAX)
                return (NULL);

        if (nchr == 0)
                nchr = ARG_MAX;

        /* Get number of strings in argv */
        mib[0] = CTL_KERN;
        mib[1] = KERN_PROC_ARGS;
        mib[2] = pid;
        mib[3] = type == KERN_PROC_ARGV ? KERN_PROC_NARGV : KERN_PROC_NENV;
        bufs = sizeof(narg);
        if (sysctl(mib, 4, &narg, &bufs, NULL, (size_t)0) == -1)
                return (NULL);

        if (kd->argv == NULL) {
                /*
                 * Try to avoid reallocs.
                 */
                kd->argc = MAX(narg + 1, 32);
                kd->argv = _kvm_malloc(kd, kd->argc * sizeof(*kd->argv));
                if (kd->argv == NULL)
                        return (NULL);
        } else if (narg + 1 > kd->argc) {
                kd->argc = MAX(2 * kd->argc, narg + 1);
                kd->argv = _kvm_realloc(kd, kd->argv, kd->argc *
                    sizeof(*kd->argv));
                if (kd->argv == NULL)
                        return (NULL);
        }

        newargspc_len = MIN(nchr, ARG_MAX);
        KVM_ALLOC(kd, argspc, newargspc_len);
        memset(kd->argspc, 0, (size_t)kd->argspc_len);  /* XXX necessary? */

        mib[0] = CTL_KERN;
        mib[1] = KERN_PROC_ARGS;
        mib[2] = pid;
        mib[3] = type;
        bufs = kd->argspc_len;
        if (sysctl(mib, 4, kd->argspc, &bufs, NULL, (size_t)0) == -1)
                return (NULL);

        bp = kd->argspc;
        bp[kd->argspc_len-1] = '\0';    /* make sure the string ends with nul */
        ap = kd->argv;
        endp = bp + MIN(nchr, bufs);

        while (bp < endp) {
                *ap++ = bp;
                /*
                 * XXX: don't need following anymore, or stick check
                 * for max argc in above while loop?
                 */
                if (ap >= kd->argv + kd->argc) {
                        kd->argc *= 2;
                        kd->argv = _kvm_realloc(kd, kd->argv,
                            kd->argc * sizeof(*kd->argv));
                        ap = kd->argv;
                }
                bp += strlen(bp) + 1;
        }
        *ap = NULL;

        return (kd->argv);
}

char **
kvm_getargv2(kvm_t *kd, const struct kinfo_proc2 *kp, int nchr)
{

        return (kvm_doargv2(kd, kp->p_pid, KERN_PROC_ARGV, nchr));
}

char **
kvm_getenvv2(kvm_t *kd, const struct kinfo_proc2 *kp, int nchr)
{

        return (kvm_doargv2(kd, kp->p_pid, KERN_PROC_ENV, nchr));
}

/*
 * Read from user space.  The user context is given by p.
 */
static ssize_t
kvm_ureadm(kvm_t *kd, const struct miniproc *p, u_long uva,
           char *buf, size_t len)
{
        char *cp;

        cp = buf;
        while (len > 0) {
                size_t cc;
                char *dp;
                u_long cnt;

                dp = _kvm_ureadm(kd, p, uva, &cnt);
                if (dp == NULL) {
                        _kvm_err(kd, 0, "invalid address (%lx)", uva);
                        return (0);
                }
                cc = (size_t)MIN(cnt, len);
                memcpy(cp, dp, cc);
                cp += cc;
                uva += cc;
                len -= cc;
        }
        return (ssize_t)(cp - buf);
}