kern_resource.c revision 1.26
1 /* $NetBSD: kern_resource.c,v 1.26 1995/03/05 20:48:15 fvdl Exp $ */ 2 3 /*- 4 * Copyright (c) 1982, 1986, 1991, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the University of 23 * California, Berkeley and its contributors. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * @(#)kern_resource.c 8.5 (Berkeley) 1/21/94 41 */ 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/kernel.h> 46 #include <sys/file.h> 47 #include <sys/resourcevar.h> 48 #include <sys/malloc.h> 49 #include <sys/proc.h> 50 51 #include <sys/mount.h> 52 #include <sys/syscallargs.h> 53 54 #include <vm/vm.h> 55 56 int donice __P((struct proc *curp, struct proc *chgp, int n)); 57 int dosetrlimit __P((struct proc *p, u_int which, struct rlimit *limp)); 58 59 /* 60 * Resource controls and accounting. 61 */ 62 63 int 64 getpriority(curp, uap, retval) 65 struct proc *curp; 66 register struct getpriority_args /* { 67 syscallarg(int) which; 68 syscallarg(int) who; 69 } */ *uap; 70 register_t *retval; 71 { 72 register struct proc *p; 73 register int low = PRIO_MAX + 1; 74 75 switch (SCARG(uap, which)) { 76 77 case PRIO_PROCESS: 78 if (SCARG(uap, who) == 0) 79 p = curp; 80 else 81 p = pfind(SCARG(uap, who)); 82 if (p == 0) 83 break; 84 low = p->p_nice; 85 break; 86 87 case PRIO_PGRP: { 88 register struct pgrp *pg; 89 90 if (SCARG(uap, who) == 0) 91 pg = curp->p_pgrp; 92 else if ((pg = pgfind(SCARG(uap, who))) == NULL) 93 break; 94 for (p = pg->pg_members.lh_first; p != 0; p = p->p_pglist.le_next) { 95 if (p->p_nice < low) 96 low = p->p_nice; 97 } 98 break; 99 } 100 101 case PRIO_USER: 102 if (SCARG(uap, who) == 0) 103 SCARG(uap, who) = curp->p_ucred->cr_uid; 104 for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) 105 if (p->p_ucred->cr_uid == SCARG(uap, who) && 106 p->p_nice < low) 107 low = p->p_nice; 108 break; 109 110 default: 111 return (EINVAL); 112 } 113 if (low == PRIO_MAX + 1) 114 return (ESRCH); 115 *retval = low; 116 return (0); 117 } 118 119 /* ARGSUSED */ 120 int 121 setpriority(curp, uap, retval) 122 struct proc *curp; 123 register struct setpriority_args /* { 124 syscallarg(int) which; 125 syscallarg(int) who; 126 syscallarg(int) prio; 127 } */ *uap; 128 register_t *retval; 129 { 130 register struct proc *p; 131 int found = 0, error = 0; 132 133 switch (SCARG(uap, which)) { 134 135 case PRIO_PROCESS: 136 if (SCARG(uap, who) == 0) 137 p = curp; 138 else 139 p = pfind(SCARG(uap, who)); 140 if (p == 0) 141 break; 142 error = donice(curp, p, SCARG(uap, prio)); 143 found++; 144 break; 145 146 case PRIO_PGRP: { 147 register struct pgrp *pg; 148 149 if (SCARG(uap, who) == 0) 150 pg = curp->p_pgrp; 151 else if ((pg = pgfind(SCARG(uap, who))) == NULL) 152 break; 153 for (p = pg->pg_members.lh_first; p != 0; 154 p = p->p_pglist.le_next) { 155 error = donice(curp, p, SCARG(uap, prio)); 156 found++; 157 } 158 break; 159 } 160 161 case PRIO_USER: 162 if (SCARG(uap, who) == 0) 163 SCARG(uap, who) = curp->p_ucred->cr_uid; 164 for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) 165 if (p->p_ucred->cr_uid == SCARG(uap, who)) { 166 error = donice(curp, p, SCARG(uap, prio)); 167 found++; 168 } 169 break; 170 171 default: 172 return (EINVAL); 173 } 174 if (found == 0) 175 return (ESRCH); 176 return (error); 177 } 178 179 int 180 donice(curp, chgp, n) 181 register struct proc *curp, *chgp; 182 register int n; 183 { 184 register struct pcred *pcred = curp->p_cred; 185 186 if (pcred->pc_ucred->cr_uid && pcred->p_ruid && 187 pcred->pc_ucred->cr_uid != chgp->p_ucred->cr_uid && 188 pcred->p_ruid != chgp->p_ucred->cr_uid) 189 return (EPERM); 190 if (n > PRIO_MAX) 191 n = PRIO_MAX; 192 if (n < PRIO_MIN) 193 n = PRIO_MIN; 194 if (n < chgp->p_nice && suser(pcred->pc_ucred, &curp->p_acflag)) 195 return (EACCES); 196 chgp->p_nice = n; 197 (void)resetpriority(chgp); 198 return (0); 199 } 200 201 #if defined(COMPAT_43) || defined(COMPAT_SUNOS) || defined(COMPAT_SVR4) \ 202 || defined(COMPAT_LINUX) 203 /* ARGSUSED */ 204 int 205 compat_43_setrlimit(p, uap, retval) 206 struct proc *p; 207 struct compat_43_setrlimit_args /* { 208 syscallarg(u_int) which; 209 syscallarg(struct ogetrlimit *) rlp; 210 } */ *uap; 211 register_t *retval; 212 { 213 struct orlimit olim; 214 struct rlimit lim; 215 int error; 216 217 if (error = copyin((caddr_t)SCARG(uap, rlp), (caddr_t)&olim, 218 sizeof (struct orlimit))) 219 return (error); 220 lim.rlim_cur = olim.rlim_cur; 221 lim.rlim_max = olim.rlim_max; 222 return (dosetrlimit(p, SCARG(uap, which), &lim)); 223 } 224 225 /* ARGSUSED */ 226 int 227 compat_43_getrlimit(p, uap, retval) 228 struct proc *p; 229 register struct compat_43_getrlimit_args /* { 230 syscallarg(u_int) which; 231 syscallarg(struct ogetrlimit *) rlp; 232 } */ *uap; 233 register_t *retval; 234 { 235 struct orlimit olim; 236 237 if (SCARG(uap, which) >= RLIM_NLIMITS) 238 return (EINVAL); 239 olim.rlim_cur = p->p_rlimit[SCARG(uap, which)].rlim_cur; 240 if (olim.rlim_cur == -1) 241 olim.rlim_cur = 0x7fffffff; 242 olim.rlim_max = p->p_rlimit[SCARG(uap, which)].rlim_max; 243 if (olim.rlim_max == -1) 244 olim.rlim_max = 0x7fffffff; 245 return (copyout((caddr_t)&olim, (caddr_t)SCARG(uap, rlp), 246 sizeof(olim))); 247 } 248 #endif /* COMPAT_43 || COMPAT_SUNOS || COMPAT_SVR4 || COMPAT_LINUX */ 249 250 /* ARGSUSED */ 251 int 252 setrlimit(p, uap, retval) 253 struct proc *p; 254 register struct setrlimit_args /* { 255 syscallarg(u_int) which; 256 syscallarg(struct rlimit *) rlp; 257 } */ *uap; 258 register_t *retval; 259 { 260 struct rlimit alim; 261 int error; 262 263 if (error = copyin((caddr_t)SCARG(uap, rlp), (caddr_t)&alim, 264 sizeof (struct rlimit))) 265 return (error); 266 return (dosetrlimit(p, SCARG(uap, which), &alim)); 267 } 268 269 int 270 dosetrlimit(p, which, limp) 271 struct proc *p; 272 u_int which; 273 struct rlimit *limp; 274 { 275 register struct rlimit *alimp; 276 extern unsigned maxdmap, maxsmap; 277 int error; 278 279 if (which >= RLIM_NLIMITS) 280 return (EINVAL); 281 alimp = &p->p_rlimit[which]; 282 if (limp->rlim_cur > alimp->rlim_max || 283 limp->rlim_max > alimp->rlim_max) 284 if (error = suser(p->p_ucred, &p->p_acflag)) 285 return (error); 286 if (limp->rlim_cur > limp->rlim_max) 287 limp->rlim_cur = limp->rlim_max; 288 if (p->p_limit->p_refcnt > 1 && 289 (p->p_limit->p_lflags & PL_SHAREMOD) == 0) { 290 p->p_limit->p_refcnt--; 291 p->p_limit = limcopy(p->p_limit); 292 alimp = &p->p_rlimit[which]; 293 } 294 295 switch (which) { 296 297 case RLIMIT_DATA: 298 if (limp->rlim_cur > maxdmap) 299 limp->rlim_cur = maxdmap; 300 if (limp->rlim_max > maxdmap) 301 limp->rlim_max = maxdmap; 302 break; 303 304 case RLIMIT_STACK: 305 if (limp->rlim_cur > maxsmap) 306 limp->rlim_cur = maxsmap; 307 if (limp->rlim_max > maxsmap) 308 limp->rlim_max = maxsmap; 309 /* 310 * Stack is allocated to the max at exec time with only 311 * "rlim_cur" bytes accessible. If stack limit is going 312 * up make more accessible, if going down make inaccessible. 313 */ 314 if (limp->rlim_cur != alimp->rlim_cur) { 315 vm_offset_t addr; 316 vm_size_t size; 317 vm_prot_t prot; 318 319 if (limp->rlim_cur > alimp->rlim_cur) { 320 prot = VM_PROT_ALL; 321 size = limp->rlim_cur - alimp->rlim_cur; 322 addr = USRSTACK - limp->rlim_cur; 323 } else { 324 prot = VM_PROT_NONE; 325 size = alimp->rlim_cur - limp->rlim_cur; 326 addr = USRSTACK - alimp->rlim_cur; 327 } 328 addr = trunc_page(addr); 329 size = round_page(size); 330 (void) vm_map_protect(&p->p_vmspace->vm_map, 331 addr, addr+size, prot, FALSE); 332 } 333 break; 334 335 case RLIMIT_NOFILE: 336 if (limp->rlim_cur > maxfiles) 337 limp->rlim_cur = maxfiles; 338 if (limp->rlim_max > maxfiles) 339 limp->rlim_max = maxfiles; 340 break; 341 342 case RLIMIT_NPROC: 343 if (limp->rlim_cur > maxproc) 344 limp->rlim_cur = maxproc; 345 if (limp->rlim_max > maxproc) 346 limp->rlim_max = maxproc; 347 break; 348 } 349 *alimp = *limp; 350 return (0); 351 } 352 353 /* ARGSUSED */ 354 int 355 getrlimit(p, uap, retval) 356 struct proc *p; 357 register struct getrlimit_args /* { 358 syscallarg(u_int) which; 359 syscallarg(struct rlimit *) rlp; 360 } */ *uap; 361 register_t *retval; 362 { 363 364 if (SCARG(uap, which) >= RLIM_NLIMITS) 365 return (EINVAL); 366 return (copyout((caddr_t)&p->p_rlimit[SCARG(uap, which)], 367 (caddr_t)SCARG(uap, rlp), sizeof (struct rlimit))); 368 } 369 370 /* 371 * Transform the running time and tick information in proc p into user, 372 * system, and interrupt time usage. 373 */ 374 void 375 calcru(p, up, sp, ip) 376 register struct proc *p; 377 register struct timeval *up; 378 register struct timeval *sp; 379 register struct timeval *ip; 380 { 381 register u_quad_t u, st, ut, it, tot; 382 register u_long sec, usec; 383 register int s; 384 struct timeval tv; 385 386 s = splstatclock(); 387 st = p->p_sticks; 388 ut = p->p_uticks; 389 it = p->p_iticks; 390 splx(s); 391 392 tot = st + ut + it; 393 if (tot == 0) { 394 up->tv_sec = up->tv_usec = 0; 395 sp->tv_sec = sp->tv_usec = 0; 396 if (ip != NULL) 397 ip->tv_sec = ip->tv_usec = 0; 398 return; 399 } 400 401 sec = p->p_rtime.tv_sec; 402 usec = p->p_rtime.tv_usec; 403 if (p == curproc) { 404 /* 405 * Adjust for the current time slice. This is actually fairly 406 * important since the error here is on the order of a time 407 * quantum, which is much greater than the sampling error. 408 */ 409 microtime(&tv); 410 sec += tv.tv_sec - runtime.tv_sec; 411 usec += tv.tv_usec - runtime.tv_usec; 412 } 413 u = sec * 1000000 + usec; 414 st = (u * st) / tot; 415 sp->tv_sec = st / 1000000; 416 sp->tv_usec = st % 1000000; 417 ut = (u * ut) / tot; 418 up->tv_sec = ut / 1000000; 419 up->tv_usec = ut % 1000000; 420 if (ip != NULL) { 421 it = (u * it) / tot; 422 ip->tv_sec = it / 1000000; 423 ip->tv_usec = it % 1000000; 424 } 425 } 426 427 /* ARGSUSED */ 428 int 429 getrusage(p, uap, retval) 430 register struct proc *p; 431 register struct getrusage_args /* { 432 syscallarg(int) who; 433 syscallarg(struct rusage *) rusage; 434 } */ *uap; 435 register_t *retval; 436 { 437 register struct rusage *rup; 438 439 switch (SCARG(uap, who)) { 440 441 case RUSAGE_SELF: 442 rup = &p->p_stats->p_ru; 443 calcru(p, &rup->ru_utime, &rup->ru_stime, NULL); 444 break; 445 446 case RUSAGE_CHILDREN: 447 rup = &p->p_stats->p_cru; 448 break; 449 450 default: 451 return (EINVAL); 452 } 453 return (copyout((caddr_t)rup, (caddr_t)SCARG(uap, rusage), 454 sizeof (struct rusage))); 455 } 456 457 void 458 ruadd(ru, ru2) 459 register struct rusage *ru, *ru2; 460 { 461 register long *ip, *ip2; 462 register int i; 463 464 __timeradd(&ru->ru_utime, &ru2->ru_utime); 465 __timeradd(&ru->ru_stime, &ru2->ru_stime); 466 if (ru->ru_maxrss < ru2->ru_maxrss) 467 ru->ru_maxrss = ru2->ru_maxrss; 468 ip = &ru->ru_first; ip2 = &ru2->ru_first; 469 for (i = &ru->ru_last - &ru->ru_first; i >= 0; i--) 470 *ip++ += *ip2++; 471 } 472 473 /* 474 * Make a copy of the plimit structure. 475 * We share these structures copy-on-write after fork, 476 * and copy when a limit is changed. 477 */ 478 struct plimit * 479 limcopy(lim) 480 struct plimit *lim; 481 { 482 register struct plimit *copy; 483 484 MALLOC(copy, struct plimit *, sizeof(struct plimit), 485 M_SUBPROC, M_WAITOK); 486 bcopy(lim->pl_rlimit, copy->pl_rlimit, 487 sizeof(struct rlimit) * RLIM_NLIMITS); 488 copy->p_lflags = 0; 489 copy->p_refcnt = 1; 490 return (copy); 491 } 492
Indexes created Sun Sep 21 19:09:51 GMT 2025