2 * Copyright (c) 1982, 1986, 1991, 1993
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4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
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7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8 * the permission of UNIX System Laboratories, Inc.
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19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
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22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
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26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * @(#)kern_resource.c 8.5 (Berkeley) 1/21/94
39 * $Id: kern_resource.c,v 1.47 1999/04/27 12:21:07 phk Exp $
42 #include "opt_compat.h"
43 #include "opt_rlimit.h"
45 #include <sys/param.h>
46 #include <sys/systm.h>
47 #include <sys/sysproto.h>
48 #include <sys/kernel.h>
50 #include <sys/resourcevar.h>
51 #include <sys/malloc.h>
55 #include <vm/vm_param.h>
56 #include <vm/vm_prot.h>
59 #include <vm/vm_map.h>
61 static int donice __P((struct proc *curp, struct proc *chgp, int n));
62 /* dosetrlimit non-static: Needed by SysVR4 emulator */
63 int dosetrlimit __P((struct proc *p, u_int which, struct rlimit *limp));
66 * Resource controls and accounting.
69 #ifndef _SYS_SYSPROTO_H_
70 struct getpriority_args {
76 getpriority(curp, uap)
78 register struct getpriority_args *uap;
80 register struct proc *p;
81 register int low = PRIO_MAX + 1;
96 register struct pgrp *pg;
100 else if ((pg = pgfind(uap->who)) == NULL)
102 for (p = pg->pg_members.lh_first; p != 0;
103 p = p->p_pglist.le_next) {
112 uap->who = curp->p_ucred->cr_uid;
113 for (p = allproc.lh_first; p != 0; p = p->p_list.le_next)
114 if (p->p_ucred->cr_uid == uap->who &&
122 if (low == PRIO_MAX + 1)
124 curp->p_retval[0] = low;
128 #ifndef _SYS_SYSPROTO_H_
129 struct setpriority_args {
137 setpriority(curp, uap)
139 register struct setpriority_args *uap;
141 register struct proc *p;
142 int found = 0, error = 0;
144 switch (uap->which) {
153 error = donice(curp, p, uap->prio);
158 register struct pgrp *pg;
162 else if ((pg = pgfind(uap->who)) == NULL)
164 for (p = pg->pg_members.lh_first; p != 0;
165 p = p->p_pglist.le_next) {
166 error = donice(curp, p, uap->prio);
174 uap->who = curp->p_ucred->cr_uid;
175 for (p = allproc.lh_first; p != 0; p = p->p_list.le_next)
176 if (p->p_ucred->cr_uid == uap->who) {
177 error = donice(curp, p, uap->prio);
191 donice(curp, chgp, n)
192 register struct proc *curp, *chgp;
195 register struct pcred *pcred = curp->p_cred;
197 if (pcred->pc_ucred->cr_uid && pcred->p_ruid &&
198 pcred->pc_ucred->cr_uid != chgp->p_ucred->cr_uid &&
199 pcred->p_ruid != chgp->p_ucred->cr_uid)
205 if (n < chgp->p_nice && suser(curp))
208 (void)resetpriority(chgp);
212 /* rtprio system call */
213 #ifndef _SYS_SYSPROTO_H_
222 * Set realtime priority
229 register struct rtprio_args *uap;
231 register struct proc *p;
232 register struct pcred *pcred = curp->p_cred;
236 error = copyin(uap->rtp, &rtp, sizeof(struct rtprio));
248 switch (uap->function) {
250 return (copyout(&p->p_rtprio, uap->rtp, sizeof(struct rtprio)));
252 if (pcred->pc_ucred->cr_uid && pcred->p_ruid &&
253 pcred->pc_ucred->cr_uid != p->p_ucred->cr_uid &&
254 pcred->p_ruid != p->p_ucred->cr_uid)
256 /* disallow setting rtprio in most cases if not superuser */
258 /* can't set someone else's */
261 /* can't set realtime priority */
263 * Realtime priority has to be restricted for reasons which should be
264 * obvious. However, for idle priority, there is a potential for
265 * system deadlock if an idleprio process gains a lock on a resource
266 * that other processes need (and the idleprio process can't run
267 * due to a CPU-bound normal process). Fix me! XXX
270 if (RTP_PRIO_IS_REALTIME(rtp.type))
272 if (rtp.type != RTP_PRIO_NORMAL)
279 case RTP_PRIO_REALTIME:
280 case RTP_PRIO_NORMAL:
282 if (rtp.prio > RTP_PRIO_MAX)
295 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
296 #ifndef _SYS_SYSPROTO_H_
297 struct osetrlimit_args {
306 register struct osetrlimit_args *uap;
313 copyin((caddr_t)uap->rlp, (caddr_t)&olim, sizeof(struct orlimit))))
315 lim.rlim_cur = olim.rlim_cur;
316 lim.rlim_max = olim.rlim_max;
317 return (dosetrlimit(p, uap->which, &lim));
320 #ifndef _SYS_SYSPROTO_H_
321 struct ogetrlimit_args {
330 register struct ogetrlimit_args *uap;
334 if (uap->which >= RLIM_NLIMITS)
336 olim.rlim_cur = p->p_rlimit[uap->which].rlim_cur;
337 if (olim.rlim_cur == -1)
338 olim.rlim_cur = 0x7fffffff;
339 olim.rlim_max = p->p_rlimit[uap->which].rlim_max;
340 if (olim.rlim_max == -1)
341 olim.rlim_max = 0x7fffffff;
342 return (copyout((caddr_t)&olim, (caddr_t)uap->rlp, sizeof(olim)));
344 #endif /* COMPAT_43 || COMPAT_SUNOS */
346 #ifndef _SYS_SYSPROTO_H_
347 struct __setrlimit_args {
356 register struct __setrlimit_args *uap;
362 copyin((caddr_t)uap->rlp, (caddr_t)&alim, sizeof (struct rlimit))))
364 return (dosetrlimit(p, uap->which, &alim));
368 dosetrlimit(p, which, limp)
373 register struct rlimit *alimp;
376 if (which >= RLIM_NLIMITS)
378 alimp = &p->p_rlimit[which];
381 * Preserve historical bugs by treating negative limits as unsigned.
383 if (limp->rlim_cur < 0)
384 limp->rlim_cur = RLIM_INFINITY;
385 if (limp->rlim_max < 0)
386 limp->rlim_max = RLIM_INFINITY;
388 if (limp->rlim_cur > alimp->rlim_max ||
389 limp->rlim_max > alimp->rlim_max)
390 if ((error = suser_xxx(0, p, PRISON_ROOT)))
392 if (limp->rlim_cur > limp->rlim_max)
393 limp->rlim_cur = limp->rlim_max;
394 if (p->p_limit->p_refcnt > 1 &&
395 (p->p_limit->p_lflags & PL_SHAREMOD) == 0) {
396 p->p_limit->p_refcnt--;
397 p->p_limit = limcopy(p->p_limit);
398 alimp = &p->p_rlimit[which];
404 if (limp->rlim_cur > RLIM_INFINITY / (rlim_t)1000000)
405 p->p_limit->p_cpulimit = RLIM_INFINITY;
407 p->p_limit->p_cpulimit =
408 (rlim_t)1000000 * limp->rlim_cur;
411 if (limp->rlim_cur > MAXDSIZ)
412 limp->rlim_cur = MAXDSIZ;
413 if (limp->rlim_max > MAXDSIZ)
414 limp->rlim_max = MAXDSIZ;
418 if (limp->rlim_cur > MAXSSIZ)
419 limp->rlim_cur = MAXSSIZ;
420 if (limp->rlim_max > MAXSSIZ)
421 limp->rlim_max = MAXSSIZ;
423 * Stack is allocated to the max at exec time with only
424 * "rlim_cur" bytes accessible. If stack limit is going
425 * up make more accessible, if going down make inaccessible.
427 if (limp->rlim_cur != alimp->rlim_cur) {
432 if (limp->rlim_cur > alimp->rlim_cur) {
434 size = limp->rlim_cur - alimp->rlim_cur;
435 addr = USRSTACK - limp->rlim_cur;
438 size = alimp->rlim_cur - limp->rlim_cur;
439 addr = USRSTACK - alimp->rlim_cur;
441 addr = trunc_page(addr);
442 size = round_page(size);
443 (void) vm_map_protect(&p->p_vmspace->vm_map,
444 addr, addr+size, prot, FALSE);
449 if (limp->rlim_cur > maxfilesperproc)
450 limp->rlim_cur = maxfilesperproc;
451 if (limp->rlim_max > maxfilesperproc)
452 limp->rlim_max = maxfilesperproc;
456 if (limp->rlim_cur > maxprocperuid)
457 limp->rlim_cur = maxprocperuid;
458 if (limp->rlim_max > maxprocperuid)
459 limp->rlim_max = maxprocperuid;
466 #ifndef _SYS_SYSPROTO_H_
467 struct __getrlimit_args {
476 register struct __getrlimit_args *uap;
479 if (uap->which >= RLIM_NLIMITS)
481 return (copyout((caddr_t)&p->p_rlimit[uap->which], (caddr_t)uap->rlp,
482 sizeof (struct rlimit)));
486 * Transform the running time and tick information in proc p into user,
487 * system, and interrupt time usage.
490 calcru(p, up, sp, ip)
496 /* {user, system, interrupt, total} {ticks, usec}; previous tu: */
497 u_int64_t ut, uu, st, su, it, iu, tt, tu, ptu;
501 /* XXX: why spl-protect ? worst case is an off-by-one report */
516 if (p->p_oncpu != 0xff) {
521 * Adjust for the current time slice. This is actually fairly
522 * important since the error here is on the order of a time
523 * quantum, which is much greater than the sampling error.
526 tu += (tv.tv_usec - switchtime.tv_usec) +
527 (tv.tv_sec - switchtime.tv_sec) * (int64_t)1000000;
529 ptu = p->p_stats->p_uu + p->p_stats->p_su + p->p_stats->p_iu;
530 if (tu < ptu || (int64_t)tu < 0) {
531 /* XXX no %qd in kernel. Truncate. */
532 printf("calcru: negative time of %ld usec for pid %d (%s)\n",
533 (long)tu, p->p_pid, p->p_comm);
542 /* Enforce monotonicity. */
543 if (uu < p->p_stats->p_uu || su < p->p_stats->p_su ||
544 iu < p->p_stats->p_iu) {
545 if (uu < p->p_stats->p_uu)
546 uu = p->p_stats->p_uu;
547 else if (uu + p->p_stats->p_su + p->p_stats->p_iu > tu)
548 uu = tu - p->p_stats->p_su - p->p_stats->p_iu;
550 su = p->p_stats->p_su;
552 su = ((tu - uu) * st) / (st + it);
553 if (su < p->p_stats->p_su)
554 su = p->p_stats->p_su;
555 else if (uu + su + p->p_stats->p_iu > tu)
556 su = tu - uu - p->p_stats->p_iu;
558 KASSERT(uu + su + p->p_stats->p_iu <= tu,
559 ("calcru: monotonisation botch 1"));
561 KASSERT(iu >= p->p_stats->p_iu,
562 ("calcru: monotonisation botch 2"));
564 p->p_stats->p_uu = uu;
565 p->p_stats->p_su = su;
566 p->p_stats->p_iu = iu;
568 up->tv_sec = uu / 1000000;
569 up->tv_usec = uu % 1000000;
570 sp->tv_sec = su / 1000000;
571 sp->tv_usec = su % 1000000;
573 ip->tv_sec = iu / 1000000;
574 ip->tv_usec = iu % 1000000;
578 #ifndef _SYS_SYSPROTO_H_
579 struct getrusage_args {
581 struct rusage *rusage;
587 register struct proc *p;
588 register struct getrusage_args *uap;
590 register struct rusage *rup;
595 rup = &p->p_stats->p_ru;
596 calcru(p, &rup->ru_utime, &rup->ru_stime, NULL);
599 case RUSAGE_CHILDREN:
600 rup = &p->p_stats->p_cru;
606 return (copyout((caddr_t)rup, (caddr_t)uap->rusage,
607 sizeof (struct rusage)));
612 register struct rusage *ru, *ru2;
614 register long *ip, *ip2;
617 timevaladd(&ru->ru_utime, &ru2->ru_utime);
618 timevaladd(&ru->ru_stime, &ru2->ru_stime);
619 if (ru->ru_maxrss < ru2->ru_maxrss)
620 ru->ru_maxrss = ru2->ru_maxrss;
621 ip = &ru->ru_first; ip2 = &ru2->ru_first;
622 for (i = &ru->ru_last - &ru->ru_first; i >= 0; i--)
627 * Make a copy of the plimit structure.
628 * We share these structures copy-on-write after fork,
629 * and copy when a limit is changed.
635 register struct plimit *copy;
637 MALLOC(copy, struct plimit *, sizeof(struct plimit),
638 M_SUBPROC, M_WAITOK);
639 bcopy(lim->pl_rlimit, copy->pl_rlimit, sizeof(struct plimit));