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freebsd-dev/sys/kern/kern_proc.c
Matthew Dillon 182da8209d Stage-2 commit of the critical*() code. This re-inlines cpu_critical_enter() 
and cpu_critical_exit() and moves associated critical prototypes into their
own header file, <arch>/<arch>/critical.h, which is only included by the
three MI source files that need it.

Backout and re-apply improperly comitted syntactical cleanups made to files
that were still under active development.  Backout improperly comitted program
structure changes that moved localized declarations to the top of two
procedures.  Partially re-apply one of the program structure changes to
move 'mask' into an intermediate block rather then in three separate
sub-blocks to make the code more readable.  Re-integrate bug fixes that Jake
made to the sparc64 code.

Note: In general, developers should not gratuitously move declarations out
of sub-blocks.  They are where they are for reasons of structure, grouping,
readability, compiler-localizability, and to avoid developer-introduced bugs
similar to several found in recent years in the VFS and VM code.

Reviewed by:	jake
2002-04-01 23:51:23 +00:00

1077 lines
25 KiB
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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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 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/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/sysproto.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>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <vm/vm_map.h>
#include <vm/uma.h>
#include <machine/critical.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 struct proc *dopfind(register pid_t);
static void doenterpgrp(struct proc *, struct pgrp *);
static void pgdelete(struct pgrp *);
static void orphanpg(struct pgrp *pg);
/*
* 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 sx pgrpsess_lock;
struct mtx pargs_ref_lock;
uma_zone_t proc_zone;
uma_zone_t ithread_zone;
/*
* Initialize global process hashing structures.
*/
void
procinit()
{
int i, j;
sx_init(&allproc_lock, "allproc");
sx_init(&proctree_lock, "proctree");
sx_init(&pgrpsess_lock, "pgrpsess");
mtx_init(&pargs_ref_lock, "struct pargs.ref", 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", sizeof (struct proc), NULL, NULL,
NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
uihashinit();
/*
* This should really be a compile time warning, but I do
* not know of any way to do that...
*/
if (sizeof(struct kinfo_proc) != KINFO_PROC_SIZE) {
printf("This message will repeat for the next 20 seconds\n");
for (i = 0; i < 20; i++) {
printf("WARNING: size of kinfo_proc (%ld) should be %d!!!\n",
(long)sizeof(struct kinfo_proc), KINFO_PROC_SIZE);
printf("The kinfo_proc structure was changed ");
printf("incorrectly in <sys/user.h>\n");
for (j = 0; j < 0x7ffffff; j++);
}
}
}
/*
* Note that we do not link to the proc's ucred here
* The thread is linked as if running but no KSE assigned
*/
static void
thread_link(struct thread *td, struct ksegrp *kg)
{
struct proc *p = kg->kg_proc;
td->td_proc = p;
td->td_ksegrp = kg;
td->td_last_kse = &p->p_kse;
TAILQ_INSERT_HEAD(&p->p_threads, td, td_plist);
TAILQ_INSERT_HEAD(&kg->kg_threads, td, td_kglist);
td->td_critnest = 0;
td->td_kse = NULL;
cpu_thread_link(td);
}
/*
* KSE is linked onto the idle queue.
*/
static void
kse_link(struct kse *ke, struct ksegrp *kg)
{
struct proc *p = kg->kg_proc;
TAILQ_INSERT_HEAD(&kg->kg_kseq, ke, ke_kglist);
kg->kg_kses++;
TAILQ_INSERT_HEAD(&kg->kg_iq, ke, ke_kgrlist);
ke->ke_proc = p;
ke->ke_ksegrp = kg;
ke->ke_thread = NULL;
ke->ke_oncpu = NOCPU;
}
static void
ksegrp_link(struct ksegrp *kg, struct proc *p)
{
TAILQ_INIT(&kg->kg_threads);
TAILQ_INIT(&kg->kg_runq); /* links with td_runq */
TAILQ_INIT(&kg->kg_slpq); /* links with td_runq */
TAILQ_INIT(&kg->kg_kseq); /* all kses in ksegrp */
TAILQ_INIT(&kg->kg_iq); /* all kses in ksegrp */
kg->kg_proc = p;
/* the following counters are in the -zero- section and may not need clearing */
kg->kg_runnable = 0;
kg->kg_kses = 0;
kg->kg_runq_kses = 0; /* XXXKSE change name */
/* link it in now that it's consitant */
TAILQ_INSERT_HEAD(&p->p_ksegrps, kg, kg_ksegrp);
}
/*
* for a newly created process,
* link up a the structure and its initial threads etc.
*/
void
proc_linkup(struct proc *p, struct ksegrp *kg,
struct kse *ke, struct thread *td)
{
TAILQ_INIT(&p->p_ksegrps); /* all ksegrps in proc */
TAILQ_INIT(&p->p_threads); /* all threads in proc */
ksegrp_link(kg, p);
kse_link(ke, kg);
thread_link(td, kg);
/* link them together for 1:1 */
td->td_kse = ke;
ke->ke_thread = td;
}
/* temporary version is ultra simple while we are in 1:1 mode */
struct thread *
thread_get(struct proc *p)
{
struct thread *td = &p->p_xxthread;
return (td);
}
/*********************
* STUB KSE syscalls
*********************/
/* struct thread_wakeup_args { struct thread_mailbox *tmbx; }; */
int
thread_wakeup(struct thread *td, struct thread_wakeup_args *uap)
{
return(ENOSYS);
}
int
kse_exit(struct thread *td, struct kse_exit_args *uap)
{
return(ENOSYS);
}
int
kse_yield(struct thread *td, struct kse_yield_args *uap)
{
return(ENOSYS);
}
int kse_wakeup(struct thread *td, struct kse_wakeup_args *uap)
{
return(ENOSYS);
}
int
kse_new(struct thread *td, struct kse_new_args *uap)
/* struct kse_new_args {
struct kse_mailbox *mbx;
int new_grp_flag;
}; */
{
return (ENOSYS);
}
/*
* 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
*/
struct proc *
pfind(pid)
register pid_t pid;
{
register struct proc *p;
sx_slock(&allproc_lock);
p = dopfind(pid);
sx_sunlock(&allproc_lock);
return (p);
}
static struct proc *
dopfind(pid)
register pid_t pid;
{
register struct proc *p;
sx_assert(&allproc_lock, SX_LOCKED);
LIST_FOREACH(p, PIDHASH(pid), p_hash)
if (p->p_pid == pid) {
PROC_LOCK(p);
break;
}
return (p);
}
/*
* Locate a process group by number.
* The caller must hold pgrpsess_lock.
*/
struct pgrp *
pgfind(pgid)
register pid_t pgid;
{
register struct pgrp *pgrp;
PGRPSESS_LOCK_ASSERT(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;
PGRPSESS_LOCK_ASSERT(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", MTX_DEF|MTX_DUPOK);
if (sess != NULL) {
/*
* new session
*/
mtx_init(&sess->s_mtx, "session", 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 pgrpsess_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;
{
PGRPSESS_LOCK_ASSERT(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;
PGRPSESS_LOCK_ASSERT(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;
PGRPSESS_XLOCK();
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);
PGRPSESS_XUNLOCK();
return (0);
}
/*
* delete a process group
*/
static void
pgdelete(pgrp)
register struct pgrp *pgrp;
{
struct session *savesess;
PGRPSESS_LOCK_ASSERT(SX_XLOCKED);
PGRP_LOCK_ASSERT(pgrp, MA_NOTOWNED);
SESS_LOCK_ASSERT(pgrp->pg_session, MA_NOTOWNED);
PGRP_LOCK(pgrp);
/*
* Reset any sigio structures pointing to us as a result of
* F_SETOWN with our pgid.
*/
funsetownlst(&pgrp->pg_sigiolst);
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;
SESS_LOCK(savesess);
savesess->s_count--;
SESS_UNLOCK(savesess);
PGRP_UNLOCK(pgrp);
if (savesess->s_count == 0) {
mtx_destroy(&savesess->s_mtx);
FREE(pgrp->pg_session, M_SESSION);
}
mtx_destroy(&pgrp->pg_mtx);
FREE(pgrp, M_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;
PGRPSESS_LOCK_ASSERT(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;
sx_slock(&proctree_lock);
if ((hispgrp = p->p_pptr->p_pgrp) != pgrp &&
hispgrp->pg_session == mysession) {
PGRP_LOCK(pgrp);
if (entering)
pgrp->pg_jobc++;
else {
--pgrp->pg_jobc;
if (pgrp->pg_jobc == 0)
orphanpg(pgrp);
}
PGRP_UNLOCK(pgrp);
}
/*
* 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) {
if ((hispgrp = p->p_pgrp) != pgrp &&
hispgrp->pg_session == mysession &&
p->p_stat != SZOMB) {
PGRP_LOCK(hispgrp);
if (entering)
hispgrp->pg_jobc++;
else {
--hispgrp->pg_jobc;
if (hispgrp->pg_jobc == 0)
orphanpg(hispgrp);
}
PGRP_UNLOCK(hispgrp);
}
}
sx_sunlock(&proctree_lock);
}
/*
* 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);
mtx_lock_spin(&sched_lock);
LIST_FOREACH(p, &pg->pg_members, p_pglist) {
if (p->p_stat == SSTOP) {
mtx_unlock_spin(&sched_lock);
LIST_FOREACH(p, &pg->pg_members, p_pglist) {
PROC_LOCK(p);
psignal(p, SIGHUP);
psignal(p, SIGCONT);
PROC_UNLOCK(p);
}
return;
}
}
mtx_unlock_spin(&sched_lock);
}
#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 */
/*
* Fill in an kinfo_proc structure for the specified process.
*/
void
fill_kinfo_proc(p, kp)
struct proc *p;
struct kinfo_proc *kp;
{
struct thread *td;
struct tty *tp;
struct session *sp;
struct timeval tv;
bzero(kp, sizeof(*kp));
kp->ki_structsize = sizeof(*kp);
kp->ki_paddr = p;
PROC_LOCK(p);
kp->ki_addr =/* p->p_addr; */0; /* XXXKSE */
kp->ki_args = p->p_args;
kp->ki_tracep = p->p_tracep;
kp->ki_textvp = p->p_textvp;
kp->ki_fd = p->p_fd;
kp->ki_vmspace = p->p_vmspace;
if (p->p_ucred) {
kp->ki_uid = p->p_ucred->cr_uid;
kp->ki_ruid = p->p_ucred->cr_ruid;
kp->ki_svuid = p->p_ucred->cr_svuid;
/* XXX bde doesn't like KI_NGROUPS */
kp->ki_ngroups = min(p->p_ucred->cr_ngroups, KI_NGROUPS);
bcopy(p->p_ucred->cr_groups, kp->ki_groups,
kp->ki_ngroups * sizeof(gid_t));
kp->ki_rgid = p->p_ucred->cr_rgid;
kp->ki_svgid = p->p_ucred->cr_svgid;
}
if (p->p_procsig) {
kp->ki_sigignore = p->p_procsig->ps_sigignore;
kp->ki_sigcatch = p->p_procsig->ps_sigcatch;
}
mtx_lock_spin(&sched_lock);
if (p->p_stat != SIDL && p->p_stat != SZOMB && 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*/
if (p->p_sflag & PS_INMEM)
kp->ki_rssize += UAREA_PAGES;
FOREACH_THREAD_IN_PROC(p, td) /* XXXKSE: thread swapout check */
kp->ki_rssize += KSTACK_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;
}
if ((p->p_sflag & PS_INMEM) && p->p_stats) {
kp->ki_start = p->p_stats->p_start;
kp->ki_rusage = p->p_stats->p_ru;
kp->ki_childtime.tv_sec = p->p_stats->p_cru.ru_utime.tv_sec +
p->p_stats->p_cru.ru_stime.tv_sec;
kp->ki_childtime.tv_usec = p->p_stats->p_cru.ru_utime.tv_usec +
p->p_stats->p_cru.ru_stime.tv_usec;
}
td = FIRST_THREAD_IN_PROC(p);
if (td->td_wmesg != NULL)
strncpy(kp->ki_wmesg, td->td_wmesg, sizeof(kp->ki_wmesg) - 1);
if (p->p_stat == SMTX) {
kp->ki_kiflag |= KI_MTXBLOCK;
strncpy(kp->ki_mtxname, td->td_mtxname,
sizeof(kp->ki_mtxname) - 1);
}
kp->ki_stat = p->p_stat;
kp->ki_sflag = p->p_sflag;
kp->ki_swtime = p->p_swtime;
kp->ki_traceflag = p->p_traceflag;
kp->ki_pid = p->p_pid;
/* vvv XXXKSE */
bintime2timeval(&p->p_runtime, &tv);
kp->ki_runtime = tv.tv_sec * (u_int64_t)1000000 + tv.tv_usec;
kp->ki_pctcpu = p->p_kse.ke_pctcpu;
kp->ki_estcpu = td->td_ksegrp->kg_estcpu;
kp->ki_slptime = td->td_ksegrp->kg_slptime;
kp->ki_wchan = td->td_wchan;
kp->ki_pri.pri_level = td->td_priority;
kp->ki_pri.pri_user = td->td_ksegrp->kg_user_pri;
kp->ki_pri.pri_class = td->td_ksegrp->kg_pri_class;
kp->ki_pri.pri_native = td->td_base_pri;
kp->ki_nice = td->td_ksegrp->kg_nice;
kp->ki_rqindex = p->p_kse.ke_rqindex;
kp->ki_oncpu = p->p_kse.ke_oncpu;
kp->ki_lastcpu = td->td_lastcpu;
kp->ki_tdflags = td->td_flags;
kp->ki_pcb = td->td_pcb;
kp->ki_kstack = (void *)td->td_kstack;
/* ^^^ XXXKSE */
mtx_unlock_spin(&sched_lock);
sp = NULL;
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);
strncpy(kp->ki_login, sp->s_login,
sizeof(kp->ki_login) - 1);
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 = NOUDEV;
if (p->p_comm[0] != '\0') {
strncpy(kp->ki_comm, p->p_comm, sizeof(kp->ki_comm) - 1);
strncpy(kp->ki_ocomm, p->p_comm, sizeof(kp->ki_ocomm) - 1);
}
kp->ki_siglist = p->p_siglist;
kp->ki_sigmask = p->p_sigmask;
kp->ki_xstat = p->p_xstat;
kp->ki_acflag = p->p_acflag;
kp->ki_flag = p->p_flag;
/* If jailed(p->p_ucred), emulate the old P_JAILED flag. */
if (jailed(p->p_ucred))
kp->ki_flag |= P_JAILED;
kp->ki_lock = p->p_lock;
if (p->p_pptr)
kp->ki_ppid = p->p_pptr->p_pid;
PROC_UNLOCK(p);
}
/*
* 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);
}
static int
sysctl_out_proc(struct proc *p, struct sysctl_req *req, int doingzomb)
{
struct kinfo_proc kinfo_proc;
int error;
struct proc *np;
pid_t pid = p->p_pid;
fill_kinfo_proc(p, &kinfo_proc);
error = SYSCTL_OUT(req, (caddr_t)&kinfo_proc, sizeof(kinfo_proc));
if (error)
return (error);
if (doingzomb)
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 doingzomb;
int error = 0;
if (oidp->oid_number == KERN_PROC_PID) {
if (namelen != 1)
return (EINVAL);
p = pfind((pid_t)name[0]);
if (!p)
return (0);
if (p_cansee(curproc, p)) {
PROC_UNLOCK(p);
return (0);
}
PROC_UNLOCK(p);
error = sysctl_out_proc(p, req, 0);
return (error);
}
if (oidp->oid_number == KERN_PROC_ALL && !namelen)
;
else if (oidp->oid_number != KERN_PROC_ALL && namelen == 1)
;
else
return (EINVAL);
if (!req->oldptr) {
/* overestimate by 5 procs */
error = SYSCTL_OUT(req, 0, sizeof (struct kinfo_proc) * 5);
if (error)
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)) {
/*
* Show a user only appropriate processes.
*/
if (p_cansee(curproc, p))
continue;
/*
* Skip embryonic processes.
*/
if (p->p_stat == SIDL)
continue;
/*
* TODO - make more efficient (see notes below).
* do by session.
*/
switch (oidp->oid_number) {
case KERN_PROC_PGRP:
/* could do this by traversing pgrp */
PROC_LOCK(p);
if (p->p_pgrp == NULL ||
p->p_pgrp->pg_id != (pid_t)name[0]) {
PROC_UNLOCK(p);
continue;
}
PROC_UNLOCK(p);
break;
case KERN_PROC_TTY:
PROC_LOCK(p);
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) !=
(udev_t)name[0]) {
SESS_UNLOCK(p->p_session);
PROC_UNLOCK(p);
continue;
}
SESS_UNLOCK(p->p_session);
PROC_UNLOCK(p);
break;
case KERN_PROC_UID:
if (p->p_ucred == NULL ||
p->p_ucred->cr_uid != (uid_t)name[0])
continue;
break;
case KERN_PROC_RUID:
if (p->p_ucred == NULL ||
p->p_ucred->cr_ruid != (uid_t)name[0])
continue;
break;
}
if (p_cansee(curproc, p))
continue;
error = sysctl_out_proc(p, req, 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 proc *p;
struct pargs *pa;
int error = 0;
if (namelen != 1)
return (EINVAL);
p = pfind((pid_t)name[0]);
if (!p)
return (0);
if ((!ps_argsopen) && p_cansee(curproc, p)) {
PROC_UNLOCK(p);
return (0);
}
PROC_UNLOCK(p);
if (req->newptr && curproc != p)
return (EPERM);
PROC_LOCK(p);
pa = p->p_args;
pargs_hold(pa);
PROC_UNLOCK(p);
if (req->oldptr && pa != NULL) {
error = SYSCTL_OUT(req, pa->ar_args, pa->ar_length);
}
if (req->newptr == NULL) {
pargs_drop(pa);
return (error);
}
PROC_LOCK(p);
pa = p->p_args;
p->p_args = NULL;
PROC_UNLOCK(p);
pargs_drop(pa);
if (req->newlen + sizeof(struct pargs) > ps_arg_cache_limit)
return (error);
pa = pargs_alloc(req->newlen);
error = SYSCTL_IN(req, pa->ar_args, req->newlen);
if (!error) {
PROC_LOCK(p);
p->p_args = pa;
PROC_UNLOCK(p);
} else
pargs_free(pa);
return (error);
}
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");
SYSCTL_NODE(_kern_proc, KERN_PROC_PGRP, pgrp, CTLFLAG_RD,
sysctl_kern_proc, "Process table");
SYSCTL_NODE(_kern_proc, KERN_PROC_TTY, tty, CTLFLAG_RD,
sysctl_kern_proc, "Process table");
SYSCTL_NODE(_kern_proc, KERN_PROC_UID, uid, CTLFLAG_RD,
sysctl_kern_proc, "Process table");
SYSCTL_NODE(_kern_proc, KERN_PROC_RUID, ruid, CTLFLAG_RD,
sysctl_kern_proc, "Process table");
SYSCTL_NODE(_kern_proc, KERN_PROC_PID, pid, CTLFLAG_RD,
sysctl_kern_proc, "Process table");
SYSCTL_NODE(_kern_proc, KERN_PROC_ARGS, args, CTLFLAG_RW | CTLFLAG_ANYBODY,
sysctl_kern_proc_args, "Process argument list");
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