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freebsd-nq/sys/kern/kern_proc.c
John Baldwin c6a37e8413 Divorce critical sections from spinlocks. Critical sections as denoted by 
critical_enter() and critical_exit() are now solely a mechanism for
deferring kernel preemptions.  They no longer have any affect on
interrupts.  This means that standalone critical sections are now very
cheap as they are simply unlocked integer increments and decrements for the
common case.

Spin mutexes now use a separate KPI implemented in MD code: spinlock_enter()
and spinlock_exit().  This KPI is responsible for providing whatever MD
guarantees are needed to ensure that a thread holding a spin lock won't
be preempted by any other code that will try to lock the same lock.  For
now all archs continue to block interrupts in a "spinlock section" as they
did formerly in all critical sections.  Note that I've also taken this
opportunity to push a few things into MD code rather than MI.  For example,
critical_fork_exit() no longer exists.  Instead, MD code ensures that new
threads have the correct state when they are created.  Also, we no longer
try to fixup the idlethreads for APs in MI code.  Instead, each arch sets
the initial curthread and adjusts the state of the idle thread it borrows
in order to perform the initial context switch.

This change is largely a big NOP, but the cleaner separation it provides
will allow for more efficient alternative locking schemes in other parts
of the kernel (bare critical sections rather than per-CPU spin mutexes
for per-CPU data for example).

Reviewed by:	grehan, cognet, arch@, others
Tested on:	i386, alpha, sparc64, powerpc, arm, possibly more
2005-04-04 21:53:56 +00:00

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/*-
* Copyright (c) 1982, 1986, 1989, 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* 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.
*
* @(#)kern_proc.c 8.7 (Berkeley) 2/14/95
* $FreeBSD$
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_ktrace.h"
#include "opt_kstack_pages.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/sysent.h>
#include <sys/sched.h>
#include <sys/smp.h>
#include <sys/sysctl.h>
#include <sys/filedesc.h>
#include <sys/tty.h>
#include <sys/signalvar.h>
#include <sys/sx.h>
#include <sys/user.h>
#include <sys/jail.h>
#ifdef KTRACE
#include <sys/uio.h>
#include <sys/ktrace.h>
#endif
#include <vm/vm.h>
#include <vm/vm_extern.h>
#include <vm/pmap.h>
#include <vm/vm_map.h>
#include <vm/uma.h>
MALLOC_DEFINE(M_PGRP, "pgrp", "process group header");
MALLOC_DEFINE(M_SESSION, "session", "session header");
static MALLOC_DEFINE(M_PROC, "proc", "Proc structures");
MALLOC_DEFINE(M_SUBPROC, "subproc", "Proc sub-structures");
static void doenterpgrp(struct proc *, struct pgrp *);
static void orphanpg(struct pgrp *pg);
static void pgadjustjobc(struct pgrp *pgrp, int entering);
static void pgdelete(struct pgrp *);
static int proc_ctor(void *mem, int size, void *arg, int flags);
static void proc_dtor(void *mem, int size, void *arg);
static int proc_init(void *mem, int size, int flags);
static void proc_fini(void *mem, int size);
/*
* Other process lists
*/
struct pidhashhead *pidhashtbl;
u_long pidhash;
struct pgrphashhead *pgrphashtbl;
u_long pgrphash;
struct proclist allproc;
struct proclist zombproc;
struct sx allproc_lock;
struct sx proctree_lock;
struct mtx pargs_ref_lock;
struct mtx ppeers_lock;
uma_zone_t proc_zone;
uma_zone_t ithread_zone;
int kstack_pages = KSTACK_PAGES;
SYSCTL_INT(_kern, OID_AUTO, kstack_pages, CTLFLAG_RD, &kstack_pages, 0, "");
CTASSERT(sizeof(struct kinfo_proc) == KINFO_PROC_SIZE);
/*
* Initialize global process hashing structures.
*/
void
procinit()
{
sx_init(&allproc_lock, "allproc");
sx_init(&proctree_lock, "proctree");
mtx_init(&pargs_ref_lock, "struct pargs.ref", NULL, MTX_DEF);
mtx_init(&ppeers_lock, "p_peers", NULL, MTX_DEF);
LIST_INIT(&allproc);
LIST_INIT(&zombproc);
pidhashtbl = hashinit(maxproc / 4, M_PROC, &pidhash);
pgrphashtbl = hashinit(maxproc / 4, M_PROC, &pgrphash);
proc_zone = uma_zcreate("PROC", sched_sizeof_proc(),
proc_ctor, proc_dtor, proc_init, proc_fini,
UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
uihashinit();
}
/*
* Prepare a proc for use.
*/
static int
proc_ctor(void *mem, int size, void *arg, int flags)
{
struct proc *p;
p = (struct proc *)mem;
return (0);
}
/*
* Reclaim a proc after use.
*/
static void
proc_dtor(void *mem, int size, void *arg)
{
struct proc *p;
struct thread *td;
#ifdef INVARIANTS
struct ksegrp *kg;
#endif
/* INVARIANTS checks go here */
p = (struct proc *)mem;
td = FIRST_THREAD_IN_PROC(p);
#ifdef INVARIANTS
KASSERT((p->p_numthreads == 1),
("bad number of threads in exiting process"));
KASSERT((p->p_numksegrps == 1), ("free proc with > 1 ksegrp"));
KASSERT((td != NULL), ("proc_dtor: bad thread pointer"));
kg = FIRST_KSEGRP_IN_PROC(p);
KASSERT((kg != NULL), ("proc_dtor: bad kg pointer"));
#endif
/* Dispose of an alternate kstack, if it exists.
* XXX What if there are more than one thread in the proc?
* The first thread in the proc is special and not
* freed, so you gotta do this here.
*/
if (((p->p_flag & P_KTHREAD) != 0) && (td->td_altkstack != 0))
vm_thread_dispose_altkstack(td);
}
/*
* Initialize type-stable parts of a proc (when newly created).
*/
static int
proc_init(void *mem, int size, int flags)
{
struct proc *p;
struct thread *td;
struct ksegrp *kg;
p = (struct proc *)mem;
p->p_sched = (struct p_sched *)&p[1];
td = thread_alloc();
kg = ksegrp_alloc();
bzero(&p->p_mtx, sizeof(struct mtx));
mtx_init(&p->p_mtx, "process lock", NULL, MTX_DEF | MTX_DUPOK);
p->p_stats = pstats_alloc();
proc_linkup(p, kg, td);
sched_newproc(p, kg, td);
return (0);
}
/*
* UMA should ensure that this function is never called.
* Freeing a proc structure would violate type stability.
*/
static void
proc_fini(void *mem, int size)
{
panic("proc reclaimed");
}
/*
* Is p an inferior of the current process?
*/
int
inferior(p)
register struct proc *p;
{
sx_assert(&proctree_lock, SX_LOCKED);
for (; p != curproc; p = p->p_pptr)
if (p->p_pid == 0)
return (0);
return (1);
}
/*
* Locate a process by number; return only "live" processes -- i.e., neither
* zombies nor newly born but incompletely initialized processes. By not
* returning processes in the PRS_NEW state, we allow callers to avoid
* testing for that condition to avoid dereferencing p_ucred, et al.
*/
struct proc *
pfind(pid)
register pid_t pid;
{
register struct proc *p;
sx_slock(&allproc_lock);
LIST_FOREACH(p, PIDHASH(pid), p_hash)
if (p->p_pid == pid) {
if (p->p_state == PRS_NEW) {
p = NULL;
break;
}
PROC_LOCK(p);
break;
}
sx_sunlock(&allproc_lock);
return (p);
}
/*
* Locate a process group by number.
* The caller must hold proctree_lock.
*/
struct pgrp *
pgfind(pgid)
register pid_t pgid;
{
register struct pgrp *pgrp;
sx_assert(&proctree_lock, SX_LOCKED);
LIST_FOREACH(pgrp, PGRPHASH(pgid), pg_hash) {
if (pgrp->pg_id == pgid) {
PGRP_LOCK(pgrp);
return (pgrp);
}
}
return (NULL);
}
/*
* Create a new process group.
* pgid must be equal to the pid of p.
* Begin a new session if required.
*/
int
enterpgrp(p, pgid, pgrp, sess)
register struct proc *p;
pid_t pgid;
struct pgrp *pgrp;
struct session *sess;
{
struct pgrp *pgrp2;
sx_assert(&proctree_lock, SX_XLOCKED);
KASSERT(pgrp != NULL, ("enterpgrp: pgrp == NULL"));
KASSERT(p->p_pid == pgid,
("enterpgrp: new pgrp and pid != pgid"));
pgrp2 = pgfind(pgid);
KASSERT(pgrp2 == NULL,
("enterpgrp: pgrp with pgid exists"));
KASSERT(!SESS_LEADER(p),
("enterpgrp: session leader attempted setpgrp"));
mtx_init(&pgrp->pg_mtx, "process group", NULL, MTX_DEF | MTX_DUPOK);
if (sess != NULL) {
/*
* new session
*/
mtx_init(&sess->s_mtx, "session", NULL, MTX_DEF);
PROC_LOCK(p);
p->p_flag &= ~P_CONTROLT;
PROC_UNLOCK(p);
PGRP_LOCK(pgrp);
sess->s_leader = p;
sess->s_sid = p->p_pid;
sess->s_count = 1;
sess->s_ttyvp = NULL;
sess->s_ttyp = NULL;
bcopy(p->p_session->s_login, sess->s_login,
sizeof(sess->s_login));
pgrp->pg_session = sess;
KASSERT(p == curproc,
("enterpgrp: mksession and p != curproc"));
} else {
pgrp->pg_session = p->p_session;
SESS_LOCK(pgrp->pg_session);
pgrp->pg_session->s_count++;
SESS_UNLOCK(pgrp->pg_session);
PGRP_LOCK(pgrp);
}
pgrp->pg_id = pgid;
LIST_INIT(&pgrp->pg_members);
/*
* As we have an exclusive lock of proctree_lock,
* this should not deadlock.
*/
LIST_INSERT_HEAD(PGRPHASH(pgid), pgrp, pg_hash);
pgrp->pg_jobc = 0;
SLIST_INIT(&pgrp->pg_sigiolst);
PGRP_UNLOCK(pgrp);
doenterpgrp(p, pgrp);
return (0);
}
/*
* Move p to an existing process group
*/
int
enterthispgrp(p, pgrp)
register struct proc *p;
struct pgrp *pgrp;
{
sx_assert(&proctree_lock, SX_XLOCKED);
PROC_LOCK_ASSERT(p, MA_NOTOWNED);
PGRP_LOCK_ASSERT(pgrp, MA_NOTOWNED);
PGRP_LOCK_ASSERT(p->p_pgrp, MA_NOTOWNED);
SESS_LOCK_ASSERT(p->p_session, MA_NOTOWNED);
KASSERT(pgrp->pg_session == p->p_session,
("%s: pgrp's session %p, p->p_session %p.\n",
__func__,
pgrp->pg_session,
p->p_session));
KASSERT(pgrp != p->p_pgrp,
("%s: p belongs to pgrp.", __func__));
doenterpgrp(p, pgrp);
return (0);
}
/*
* Move p to a process group
*/
static void
doenterpgrp(p, pgrp)
struct proc *p;
struct pgrp *pgrp;
{
struct pgrp *savepgrp;
sx_assert(&proctree_lock, SX_XLOCKED);
PROC_LOCK_ASSERT(p, MA_NOTOWNED);
PGRP_LOCK_ASSERT(pgrp, MA_NOTOWNED);
PGRP_LOCK_ASSERT(p->p_pgrp, MA_NOTOWNED);
SESS_LOCK_ASSERT(p->p_session, MA_NOTOWNED);
savepgrp = p->p_pgrp;
/*
* Adjust eligibility of affected pgrps to participate in job control.
* Increment eligibility counts before decrementing, otherwise we
* could reach 0 spuriously during the first call.
*/
fixjobc(p, pgrp, 1);
fixjobc(p, p->p_pgrp, 0);
PGRP_LOCK(pgrp);
PGRP_LOCK(savepgrp);
PROC_LOCK(p);
LIST_REMOVE(p, p_pglist);
p->p_pgrp = pgrp;
PROC_UNLOCK(p);
LIST_INSERT_HEAD(&pgrp->pg_members, p, p_pglist);
PGRP_UNLOCK(savepgrp);
PGRP_UNLOCK(pgrp);
if (LIST_EMPTY(&savepgrp->pg_members))
pgdelete(savepgrp);
}
/*
* remove process from process group
*/
int
leavepgrp(p)
register struct proc *p;
{
struct pgrp *savepgrp;
sx_assert(&proctree_lock, SX_XLOCKED);
savepgrp = p->p_pgrp;
PGRP_LOCK(savepgrp);
PROC_LOCK(p);
LIST_REMOVE(p, p_pglist);
p->p_pgrp = NULL;
PROC_UNLOCK(p);
PGRP_UNLOCK(savepgrp);
if (LIST_EMPTY(&savepgrp->pg_members))
pgdelete(savepgrp);
return (0);
}
/*
* delete a process group
*/
static void
pgdelete(pgrp)
register struct pgrp *pgrp;
{
struct session *savesess;
sx_assert(&proctree_lock, SX_XLOCKED);
PGRP_LOCK_ASSERT(pgrp, MA_NOTOWNED);
SESS_LOCK_ASSERT(pgrp->pg_session, MA_NOTOWNED);
/*
* Reset any sigio structures pointing to us as a result of
* F_SETOWN with our pgid.
*/
funsetownlst(&pgrp->pg_sigiolst);
PGRP_LOCK(pgrp);
if (pgrp->pg_session->s_ttyp != NULL &&
pgrp->pg_session->s_ttyp->t_pgrp == pgrp)
pgrp->pg_session->s_ttyp->t_pgrp = NULL;
LIST_REMOVE(pgrp, pg_hash);
savesess = pgrp->pg_session;
SESSRELE(savesess);
PGRP_UNLOCK(pgrp);
mtx_destroy(&pgrp->pg_mtx);
FREE(pgrp, M_PGRP);
}
static void
pgadjustjobc(pgrp, entering)
struct pgrp *pgrp;
int entering;
{
PGRP_LOCK(pgrp);
if (entering)
pgrp->pg_jobc++;
else {
--pgrp->pg_jobc;
if (pgrp->pg_jobc == 0)
orphanpg(pgrp);
}
PGRP_UNLOCK(pgrp);
}
/*
* Adjust pgrp jobc counters when specified process changes process group.
* We count the number of processes in each process group that "qualify"
* the group for terminal job control (those with a parent in a different
* process group of the same session). If that count reaches zero, the
* process group becomes orphaned. Check both the specified process'
* process group and that of its children.
* entering == 0 => p is leaving specified group.
* entering == 1 => p is entering specified group.
*/
void
fixjobc(p, pgrp, entering)
register struct proc *p;
register struct pgrp *pgrp;
int entering;
{
register struct pgrp *hispgrp;
register struct session *mysession;
sx_assert(&proctree_lock, SX_LOCKED);
PROC_LOCK_ASSERT(p, MA_NOTOWNED);
PGRP_LOCK_ASSERT(pgrp, MA_NOTOWNED);
SESS_LOCK_ASSERT(pgrp->pg_session, MA_NOTOWNED);
/*
* Check p's parent to see whether p qualifies its own process
* group; if so, adjust count for p's process group.
*/
mysession = pgrp->pg_session;
if ((hispgrp = p->p_pptr->p_pgrp) != pgrp &&
hispgrp->pg_session == mysession)
pgadjustjobc(pgrp, entering);
/*
* Check this process' children to see whether they qualify
* their process groups; if so, adjust counts for children's
* process groups.
*/
LIST_FOREACH(p, &p->p_children, p_sibling) {
hispgrp = p->p_pgrp;
if (hispgrp == pgrp ||
hispgrp->pg_session != mysession)
continue;
PROC_LOCK(p);
if (p->p_state == PRS_ZOMBIE) {
PROC_UNLOCK(p);
continue;
}
PROC_UNLOCK(p);
pgadjustjobc(hispgrp, entering);
}
}
/*
* A process group has become orphaned;
* if there are any stopped processes in the group,
* hang-up all process in that group.
*/
static void
orphanpg(pg)
struct pgrp *pg;
{
register struct proc *p;
PGRP_LOCK_ASSERT(pg, MA_OWNED);
LIST_FOREACH(p, &pg->pg_members, p_pglist) {
PROC_LOCK(p);
if (P_SHOULDSTOP(p)) {
PROC_UNLOCK(p);
LIST_FOREACH(p, &pg->pg_members, p_pglist) {
PROC_LOCK(p);
psignal(p, SIGHUP);
psignal(p, SIGCONT);
PROC_UNLOCK(p);
}
return;
}
PROC_UNLOCK(p);
}
}
void
sessrele(struct session *s)
{
int i;
SESS_LOCK(s);
i = --s->s_count;
SESS_UNLOCK(s);
if (i == 0) {
if (s->s_ttyp != NULL)
ttyrel(s->s_ttyp);
mtx_destroy(&s->s_mtx);
FREE(s, M_SESSION);
}
}
#include "opt_ddb.h"
#ifdef DDB
#include <ddb/ddb.h>
DB_SHOW_COMMAND(pgrpdump, pgrpdump)
{
register struct pgrp *pgrp;
register struct proc *p;
register int i;
for (i = 0; i <= pgrphash; i++) {
if (!LIST_EMPTY(&pgrphashtbl[i])) {
printf("\tindx %d\n", i);
LIST_FOREACH(pgrp, &pgrphashtbl[i], pg_hash) {
printf(
"\tpgrp %p, pgid %ld, sess %p, sesscnt %d, mem %p\n",
(void *)pgrp, (long)pgrp->pg_id,
(void *)pgrp->pg_session,
pgrp->pg_session->s_count,
(void *)LIST_FIRST(&pgrp->pg_members));
LIST_FOREACH(p, &pgrp->pg_members, p_pglist) {
printf("\t\tpid %ld addr %p pgrp %p\n",
(long)p->p_pid, (void *)p,
(void *)p->p_pgrp);
}
}
}
}
}
#endif /* DDB */
void
fill_kinfo_thread(struct thread *td, struct kinfo_proc *kp);
/*
* Fill in a kinfo_proc structure for the specified process.
* Must be called with the target process locked.
*/
void
fill_kinfo_proc(struct proc *p, struct kinfo_proc *kp)
{
fill_kinfo_thread(FIRST_THREAD_IN_PROC(p), kp);
}
void
fill_kinfo_thread(struct thread *td, struct kinfo_proc *kp)
{
struct proc *p;
struct thread *td0;
struct ksegrp *kg;
struct tty *tp;
struct session *sp;
struct timeval tv;
struct ucred *cred;
struct sigacts *ps;
p = td->td_proc;
bzero(kp, sizeof(*kp));
kp->ki_structsize = sizeof(*kp);
kp->ki_paddr = p;
PROC_LOCK_ASSERT(p, MA_OWNED);
kp->ki_addr =/* p->p_addr; */0; /* XXXKSE */
kp->ki_args = p->p_args;
kp->ki_textvp = p->p_textvp;
#ifdef KTRACE
kp->ki_tracep = p->p_tracevp;
mtx_lock(&ktrace_mtx);
kp->ki_traceflag = p->p_traceflag;
mtx_unlock(&ktrace_mtx);
#endif
kp->ki_fd = p->p_fd;
kp->ki_vmspace = p->p_vmspace;
kp->ki_flag = p->p_flag;
cred = p->p_ucred;
if (cred) {
kp->ki_uid = cred->cr_uid;
kp->ki_ruid = cred->cr_ruid;
kp->ki_svuid = cred->cr_svuid;
/* XXX bde doesn't like KI_NGROUPS */
kp->ki_ngroups = min(cred->cr_ngroups, KI_NGROUPS);
bcopy(cred->cr_groups, kp->ki_groups,
kp->ki_ngroups * sizeof(gid_t));
kp->ki_rgid = cred->cr_rgid;
kp->ki_svgid = cred->cr_svgid;
/* If jailed(cred), emulate the old P_JAILED flag. */
if (jailed(cred)) {
kp->ki_flag |= P_JAILED;
/* If inside a jail, use 0 as a jail ID. */
if (!jailed(curthread->td_ucred))
kp->ki_jid = cred->cr_prison->pr_id;
}
}
ps = p->p_sigacts;
if (ps) {
mtx_lock(&ps->ps_mtx);
kp->ki_sigignore = ps->ps_sigignore;
kp->ki_sigcatch = ps->ps_sigcatch;
mtx_unlock(&ps->ps_mtx);
}
mtx_lock_spin(&sched_lock);
if (p->p_state != PRS_NEW &&
p->p_state != PRS_ZOMBIE &&
p->p_vmspace != NULL) {
struct vmspace *vm = p->p_vmspace;
kp->ki_size = vm->vm_map.size;
kp->ki_rssize = vmspace_resident_count(vm); /*XXX*/
FOREACH_THREAD_IN_PROC(p, td0) {
if (!TD_IS_SWAPPED(td0))
kp->ki_rssize += td0->td_kstack_pages;
if (td0->td_altkstack_obj != NULL)
kp->ki_rssize += td0->td_altkstack_pages;
}
kp->ki_swrss = vm->vm_swrss;
kp->ki_tsize = vm->vm_tsize;
kp->ki_dsize = vm->vm_dsize;
kp->ki_ssize = vm->vm_ssize;
}
kp->ki_sflag = p->p_sflag;
kp->ki_swtime = p->p_swtime;
kp->ki_pid = p->p_pid;
kp->ki_nice = p->p_nice;
bintime2timeval(&p->p_rux.rux_runtime, &tv);
kp->ki_runtime = tv.tv_sec * (u_int64_t)1000000 + tv.tv_usec;
if (p->p_state != PRS_ZOMBIE) {
#if 0
if (td == NULL) {
/* XXXKSE: This should never happen. */
printf("fill_kinfo_proc(): pid %d has no threads!\n",
p->p_pid);
mtx_unlock_spin(&sched_lock);
return;
}
#endif
if (td->td_wmesg != NULL) {
strlcpy(kp->ki_wmesg, td->td_wmesg,
sizeof(kp->ki_wmesg));
}
if (TD_ON_LOCK(td)) {
kp->ki_kiflag |= KI_LOCKBLOCK;
strlcpy(kp->ki_lockname, td->td_lockname,
sizeof(kp->ki_lockname));
}
if (p->p_state == PRS_NORMAL) { /* XXXKSE very approximate */
if (TD_ON_RUNQ(td) ||
TD_CAN_RUN(td) ||
TD_IS_RUNNING(td)) {
kp->ki_stat = SRUN;
} else if (P_SHOULDSTOP(p)) {
kp->ki_stat = SSTOP;
} else if (TD_IS_SLEEPING(td)) {
kp->ki_stat = SSLEEP;
} else if (TD_ON_LOCK(td)) {
kp->ki_stat = SLOCK;
} else {
kp->ki_stat = SWAIT;
}
} else {
kp->ki_stat = SIDL;
}
kg = td->td_ksegrp;
/* things in the KSE GROUP */
kp->ki_estcpu = kg->kg_estcpu;
kp->ki_slptime = kg->kg_slptime;
kp->ki_pri.pri_user = kg->kg_user_pri;
kp->ki_pri.pri_class = kg->kg_pri_class;
/* Things in the thread */
kp->ki_wchan = td->td_wchan;
kp->ki_pri.pri_level = td->td_priority;
kp->ki_pri.pri_native = td->td_base_pri;
kp->ki_lastcpu = td->td_lastcpu;
kp->ki_oncpu = td->td_oncpu;
kp->ki_tdflags = td->td_flags;
kp->ki_tid = td->td_tid;
kp->ki_numthreads = p->p_numthreads;
kp->ki_pcb = td->td_pcb;
kp->ki_kstack = (void *)td->td_kstack;
kp->ki_pctcpu = sched_pctcpu(td);
/* We can't get this anymore but ps etc never used it anyway. */
kp->ki_rqindex = 0;
} else {
kp->ki_stat = SZOMB;
}
mtx_unlock_spin(&sched_lock);
if ((p->p_sflag & PS_INMEM) && p->p_stats != NULL) {
kp->ki_start = p->p_stats->p_start;
timevaladd(&kp->ki_start, &boottime);
kp->ki_rusage = p->p_stats->p_ru;
calcru(p, &kp->ki_rusage.ru_utime, &kp->ki_rusage.ru_stime);
calccru(p, &kp->ki_childutime, &kp->ki_childstime);
/* Some callers want child-times in a single value */
kp->ki_childtime = kp->ki_childstime;
timevaladd(&kp->ki_childtime, &kp->ki_childutime);
}
tp = NULL;
if (p->p_pgrp) {
kp->ki_pgid = p->p_pgrp->pg_id;
kp->ki_jobc = p->p_pgrp->pg_jobc;
sp = p->p_pgrp->pg_session;
if (sp != NULL) {
kp->ki_sid = sp->s_sid;
SESS_LOCK(sp);
strlcpy(kp->ki_login, sp->s_login,
sizeof(kp->ki_login));
if (sp->s_ttyvp)
kp->ki_kiflag |= KI_CTTY;
if (SESS_LEADER(p))
kp->ki_kiflag |= KI_SLEADER;
tp = sp->s_ttyp;
SESS_UNLOCK(sp);
}
}
if ((p->p_flag & P_CONTROLT) && tp != NULL) {
kp->ki_tdev = dev2udev(tp->t_dev);
kp->ki_tpgid = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID;
if (tp->t_session)
kp->ki_tsid = tp->t_session->s_sid;
} else
kp->ki_tdev = NODEV;
if (p->p_comm[0] != '\0') {
strlcpy(kp->ki_comm, p->p_comm, sizeof(kp->ki_comm));
strlcpy(kp->ki_ocomm, p->p_comm, sizeof(kp->ki_ocomm));
}
if (p->p_sysent && p->p_sysent->sv_name != NULL &&
p->p_sysent->sv_name[0] != '\0')
strlcpy(kp->ki_emul, p->p_sysent->sv_name, sizeof(kp->ki_emul));
kp->ki_siglist = p->p_siglist;
SIGSETOR(kp->ki_siglist, td->td_siglist);
kp->ki_sigmask = td->td_sigmask;
kp->ki_xstat = p->p_xstat;
kp->ki_acflag = p->p_acflag;
kp->ki_lock = p->p_lock;
if (p->p_pptr)
kp->ki_ppid = p->p_pptr->p_pid;
}
struct pstats *
pstats_alloc(void)
{
return (malloc(sizeof(struct pstats), M_SUBPROC, M_ZERO|M_WAITOK));
}
/*
* Copy parts of p_stats; zero the rest of p_stats (statistics).
*/
void
pstats_fork(struct pstats *src, struct pstats *dst)
{
bzero(&dst->pstat_startzero,
__rangeof(struct pstats, pstat_startzero, pstat_endzero));
bcopy(&src->pstat_startcopy, &dst->pstat_startcopy,
__rangeof(struct pstats, pstat_startcopy, pstat_endcopy));
}
void
pstats_free(struct pstats *ps)
{
free(ps, M_SUBPROC);
}
/*
* Locate a zombie process by number
*/
struct proc *
zpfind(pid_t pid)
{
struct proc *p;
sx_slock(&allproc_lock);
LIST_FOREACH(p, &zombproc, p_list)
if (p->p_pid == pid) {
PROC_LOCK(p);
break;
}
sx_sunlock(&allproc_lock);
return (p);
}
#define KERN_PROC_ZOMBMASK 0x3
#define KERN_PROC_NOTHREADS 0x4
/*
* Must be called with the process locked and will return with it unlocked.
*/
static int
sysctl_out_proc(struct proc *p, struct sysctl_req *req, int flags)
{
struct thread *td;
struct kinfo_proc kinfo_proc;
int error = 0;
struct proc *np;
pid_t pid = p->p_pid;
PROC_LOCK_ASSERT(p, MA_OWNED);
if (flags & KERN_PROC_NOTHREADS) {
fill_kinfo_proc(p, &kinfo_proc);
PROC_UNLOCK(p);
error = SYSCTL_OUT(req, (caddr_t)&kinfo_proc,
sizeof(kinfo_proc));
PROC_LOCK(p);
} else {
_PHOLD(p);
FOREACH_THREAD_IN_PROC(p, td) {
fill_kinfo_thread(td, &kinfo_proc);
PROC_UNLOCK(p);
error = SYSCTL_OUT(req, (caddr_t)&kinfo_proc,
sizeof(kinfo_proc));
PROC_LOCK(p);
if (error)
break;
}
_PRELE(p);
}
PROC_UNLOCK(p);
if (error)
return (error);
if (flags & KERN_PROC_ZOMBMASK)
np = zpfind(pid);
else {
if (pid == 0)
return (0);
np = pfind(pid);
}
if (np == NULL)
return EAGAIN;
if (np != p) {
PROC_UNLOCK(np);
return EAGAIN;
}
PROC_UNLOCK(np);
return (0);
}
static int
sysctl_kern_proc(SYSCTL_HANDLER_ARGS)
{
int *name = (int*) arg1;
u_int namelen = arg2;
struct proc *p;
int flags, doingzomb, oid_number;
int error = 0;
oid_number = oidp->oid_number;
if (oid_number != KERN_PROC_ALL &&
(oid_number & KERN_PROC_INC_THREAD) == 0)
flags = KERN_PROC_NOTHREADS;
else {
flags = 0;
oid_number &= ~KERN_PROC_INC_THREAD;
}
if (oid_number == KERN_PROC_PID) {
if (namelen != 1)
return (EINVAL);
p = pfind((pid_t)name[0]);
if (!p)
return (ESRCH);
if ((error = p_cansee(curthread, p))) {
PROC_UNLOCK(p);
return (error);
}
error = sysctl_out_proc(p, req, flags);
return (error);
}
switch (oid_number) {
case KERN_PROC_ALL:
if (namelen != 0)
return (EINVAL);
break;
case KERN_PROC_PROC:
if (namelen != 0 && namelen != 1)
return (EINVAL);
break;
default:
if (namelen != 1)
return (EINVAL);
break;
}
if (!req->oldptr) {
/* overestimate by 5 procs */
error = SYSCTL_OUT(req, 0, sizeof (struct kinfo_proc) * 5);
if (error)
return (error);
}
error = sysctl_wire_old_buffer(req, 0);
if (error != 0)
return (error);
sx_slock(&allproc_lock);
for (doingzomb=0 ; doingzomb < 2 ; doingzomb++) {
if (!doingzomb)
p = LIST_FIRST(&allproc);
else
p = LIST_FIRST(&zombproc);
for (; p != 0; p = LIST_NEXT(p, p_list)) {
/*
* Skip embryonic processes.
*/
mtx_lock_spin(&sched_lock);
if (p->p_state == PRS_NEW) {
mtx_unlock_spin(&sched_lock);
continue;
}
mtx_unlock_spin(&sched_lock);
PROC_LOCK(p);
/*
* Show a user only appropriate processes.
*/
if (p_cansee(curthread, p)) {
PROC_UNLOCK(p);
continue;
}
/*
* TODO - make more efficient (see notes below).
* do by session.
*/
switch (oid_number) {
case KERN_PROC_GID:
if (p->p_ucred == NULL ||
p->p_ucred->cr_gid != (gid_t)name[0]) {
PROC_UNLOCK(p);
continue;
}
break;
case KERN_PROC_PGRP:
/* could do this by traversing pgrp */
if (p->p_pgrp == NULL ||
p->p_pgrp->pg_id != (pid_t)name[0]) {
PROC_UNLOCK(p);
continue;
}
break;
case KERN_PROC_RGID:
if (p->p_ucred == NULL ||
p->p_ucred->cr_rgid != (gid_t)name[0]) {
PROC_UNLOCK(p);
continue;
}
break;
case KERN_PROC_SESSION:
if (p->p_session == NULL ||
p->p_session->s_sid != (pid_t)name[0]) {
PROC_UNLOCK(p);
continue;
}
break;
case KERN_PROC_TTY:
if ((p->p_flag & P_CONTROLT) == 0 ||
p->p_session == NULL) {
PROC_UNLOCK(p);
continue;
}
SESS_LOCK(p->p_session);
if (p->p_session->s_ttyp == NULL ||
dev2udev(p->p_session->s_ttyp->t_dev) !=
(dev_t)name[0]) {
SESS_UNLOCK(p->p_session);
PROC_UNLOCK(p);
continue;
}
SESS_UNLOCK(p->p_session);
break;
case KERN_PROC_UID:
if (p->p_ucred == NULL ||
p->p_ucred->cr_uid != (uid_t)name[0]) {
PROC_UNLOCK(p);
continue;
}
break;
case KERN_PROC_RUID:
if (p->p_ucred == NULL ||
p->p_ucred->cr_ruid != (uid_t)name[0]) {
PROC_UNLOCK(p);
continue;
}
break;
case KERN_PROC_PROC:
break;
default:
break;
}
error = sysctl_out_proc(p, req, flags | doingzomb);
if (error) {
sx_sunlock(&allproc_lock);
return (error);
}
}
}
sx_sunlock(&allproc_lock);
return (0);
}
struct pargs *
pargs_alloc(int len)
{
struct pargs *pa;
MALLOC(pa, struct pargs *, sizeof(struct pargs) + len, M_PARGS,
M_WAITOK);
pa->ar_ref = 1;
pa->ar_length = len;
return (pa);
}
void
pargs_free(struct pargs *pa)
{
FREE(pa, M_PARGS);
}
void
pargs_hold(struct pargs *pa)
{
if (pa == NULL)
return;
PARGS_LOCK(pa);
pa->ar_ref++;
PARGS_UNLOCK(pa);
}
void
pargs_drop(struct pargs *pa)
{
if (pa == NULL)
return;
PARGS_LOCK(pa);
if (--pa->ar_ref == 0) {
PARGS_UNLOCK(pa);
pargs_free(pa);
} else
PARGS_UNLOCK(pa);
}
/*
* This sysctl allows a process to retrieve the argument list or process
* title for another process without groping around in the address space
* of the other process. It also allow a process to set its own "process
* title to a string of its own choice.
*/
static int
sysctl_kern_proc_args(SYSCTL_HANDLER_ARGS)
{
int *name = (int*) arg1;
u_int namelen = arg2;
struct pargs *newpa, *pa;
struct proc *p;
int error = 0;
if (namelen != 1)
return (EINVAL);
p = pfind((pid_t)name[0]);
if (!p)
return (ESRCH);
if ((error = p_cansee(curthread, p)) != 0) {
PROC_UNLOCK(p);
return (error);
}
if (req->newptr && curproc != p) {
PROC_UNLOCK(p);
return (EPERM);
}
pa = p->p_args;
pargs_hold(pa);
PROC_UNLOCK(p);
if (req->oldptr != NULL && pa != NULL)
error = SYSCTL_OUT(req, pa->ar_args, pa->ar_length);
pargs_drop(pa);
if (error != 0 || req->newptr == NULL)
return (error);
if (req->newlen + sizeof(struct pargs) > ps_arg_cache_limit)
return (ENOMEM);
newpa = pargs_alloc(req->newlen);
error = SYSCTL_IN(req, newpa->ar_args, req->newlen);
if (error != 0) {
pargs_free(newpa);
return (error);
}
PROC_LOCK(p);
pa = p->p_args;
p->p_args = newpa;
PROC_UNLOCK(p);
pargs_drop(pa);
return (0);
}
static int
sysctl_kern_proc_sv_name(SYSCTL_HANDLER_ARGS)
{
struct proc *p;
char *sv_name;
int *name;
int namelen;
int error;
namelen = arg2;
if (namelen != 1)
return (EINVAL);
name = (int *)arg1;
if ((p = pfind((pid_t)name[0])) == NULL)
return (ESRCH);
if ((error = p_cansee(curthread, p))) {
PROC_UNLOCK(p);
return (error);
}
sv_name = p->p_sysent->sv_name;
PROC_UNLOCK(p);
return (sysctl_handle_string(oidp, sv_name, 0, req));
}
static SYSCTL_NODE(_kern, KERN_PROC, proc, CTLFLAG_RD, 0, "Process table");
SYSCTL_PROC(_kern_proc, KERN_PROC_ALL, all, CTLFLAG_RD|CTLTYPE_STRUCT,
0, 0, sysctl_kern_proc, "S,proc", "Return entire process table");
static SYSCTL_NODE(_kern_proc, KERN_PROC_GID, gid, CTLFLAG_RD,
sysctl_kern_proc, "Process table");
static SYSCTL_NODE(_kern_proc, KERN_PROC_PGRP, pgrp, CTLFLAG_RD,
sysctl_kern_proc, "Process table");
static SYSCTL_NODE(_kern_proc, KERN_PROC_RGID, rgid, CTLFLAG_RD,
sysctl_kern_proc, "Process table");
static SYSCTL_NODE(_kern_proc, KERN_PROC_SESSION, sid, CTLFLAG_RD,
sysctl_kern_proc, "Process table");
static SYSCTL_NODE(_kern_proc, KERN_PROC_TTY, tty, CTLFLAG_RD,
sysctl_kern_proc, "Process table");
static SYSCTL_NODE(_kern_proc, KERN_PROC_UID, uid, CTLFLAG_RD,
sysctl_kern_proc, "Process table");
static SYSCTL_NODE(_kern_proc, KERN_PROC_RUID, ruid, CTLFLAG_RD,
sysctl_kern_proc, "Process table");
static SYSCTL_NODE(_kern_proc, KERN_PROC_PID, pid, CTLFLAG_RD,
sysctl_kern_proc, "Process table");
static SYSCTL_NODE(_kern_proc, KERN_PROC_PROC, proc, CTLFLAG_RD,
sysctl_kern_proc, "Return process table, no threads");
static SYSCTL_NODE(_kern_proc, KERN_PROC_ARGS, args,
CTLFLAG_RW | CTLFLAG_ANYBODY,
sysctl_kern_proc_args, "Process argument list");
static SYSCTL_NODE(_kern_proc, KERN_PROC_SV_NAME, sv_name, CTLFLAG_RD,
sysctl_kern_proc_sv_name, "Process syscall vector name (ABI type)");
static SYSCTL_NODE(_kern_proc, (KERN_PROC_GID | KERN_PROC_INC_THREAD), gid_td,
CTLFLAG_RD, sysctl_kern_proc, "Process table");
static SYSCTL_NODE(_kern_proc, (KERN_PROC_PGRP | KERN_PROC_INC_THREAD), pgrp_td,
CTLFLAG_RD, sysctl_kern_proc, "Process table");
static SYSCTL_NODE(_kern_proc, (KERN_PROC_RGID | KERN_PROC_INC_THREAD), rgid_td,
CTLFLAG_RD, sysctl_kern_proc, "Process table");
static SYSCTL_NODE(_kern_proc, (KERN_PROC_SESSION | KERN_PROC_INC_THREAD),
sid_td, CTLFLAG_RD, sysctl_kern_proc, "Process table");
static SYSCTL_NODE(_kern_proc, (KERN_PROC_TTY | KERN_PROC_INC_THREAD), tty_td,
CTLFLAG_RD, sysctl_kern_proc, "Process table");
static SYSCTL_NODE(_kern_proc, (KERN_PROC_UID | KERN_PROC_INC_THREAD), uid_td,
CTLFLAG_RD, sysctl_kern_proc, "Process table");
static SYSCTL_NODE(_kern_proc, (KERN_PROC_RUID | KERN_PROC_INC_THREAD), ruid_td,
CTLFLAG_RD, sysctl_kern_proc, "Process table");
static SYSCTL_NODE(_kern_proc, (KERN_PROC_PID | KERN_PROC_INC_THREAD), pid_td,
CTLFLAG_RD, sysctl_kern_proc, "Process table");
static SYSCTL_NODE(_kern_proc, (KERN_PROC_PROC | KERN_PROC_INC_THREAD), proc_td,
CTLFLAG_RD, sysctl_kern_proc, "Return process table, no threads");
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