kern_resource.c revision 1.34.4.2
1 /* $NetBSD: kern_resource.c,v 1.34.4.2 1996/07/11 00:46:04 jtc 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 void limfree __P((struct plimit *)); 57 /* 58 * Resource controls and accounting. 59 */ 60 61 int 62 sys_getpriority(curp, v, retval) 63 struct proc *curp; 64 void *v; 65 register_t *retval; 66 { 67 register struct sys_getpriority_args /* { 68 syscallarg(int) which; 69 syscallarg(int) who; 70 } */ *uap = v; 71 register struct proc *p; 72 register int low = PRIO_MAX + 1; 73 74 switch (SCARG(uap, which)) { 75 76 case PRIO_PROCESS: 77 if (SCARG(uap, who) == 0) 78 p = curp; 79 else 80 p = pfind(SCARG(uap, who)); 81 if (p == 0) 82 break; 83 low = p->p_nice; 84 break; 85 86 case PRIO_PGRP: { 87 register struct pgrp *pg; 88 89 if (SCARG(uap, who) == 0) 90 pg = curp->p_pgrp; 91 else if ((pg = pgfind(SCARG(uap, who))) == NULL) 92 break; 93 for (p = pg->pg_members.lh_first; p != 0; p = p->p_pglist.le_next) { 94 if (p->p_nice < low) 95 low = p->p_nice; 96 } 97 break; 98 } 99 100 case PRIO_USER: 101 if (SCARG(uap, who) == 0) 102 SCARG(uap, who) = curp->p_ucred->cr_uid; 103 for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) 104 if (p->p_ucred->cr_uid == SCARG(uap, who) && 105 p->p_nice < low) 106 low = p->p_nice; 107 break; 108 109 default: 110 return (EINVAL); 111 } 112 if (low == PRIO_MAX + 1) 113 return (ESRCH); 114 *retval = low; 115 return (0); 116 } 117 118 /* ARGSUSED */ 119 int 120 sys_setpriority(curp, v, retval) 121 struct proc *curp; 122 void *v; 123 register_t *retval; 124 { 125 register struct sys_setpriority_args /* { 126 syscallarg(int) which; 127 syscallarg(int) who; 128 syscallarg(int) prio; 129 } */ *uap = v; 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 /* ARGSUSED */ 202 int 203 sys_setrlimit(p, v, retval) 204 struct proc *p; 205 void *v; 206 register_t *retval; 207 { 208 register struct sys_setrlimit_args /* { 209 syscallarg(u_int) which; 210 syscallarg(struct rlimit *) rlp; 211 } */ *uap = v; 212 struct rlimit alim; 213 int error; 214 215 error = copyin((caddr_t)SCARG(uap, rlp), (caddr_t)&alim, 216 sizeof (struct rlimit)); 217 if (error) 218 return (error); 219 return (dosetrlimit(p, SCARG(uap, which), &alim)); 220 } 221 222 int 223 dosetrlimit(p, which, limp) 224 struct proc *p; 225 u_int which; 226 struct rlimit *limp; 227 { 228 register struct rlimit *alimp; 229 extern unsigned maxdmap, maxsmap; 230 int error; 231 232 if (which >= RLIM_NLIMITS) 233 return (EINVAL); 234 alimp = &p->p_rlimit[which]; 235 if (limp->rlim_cur > alimp->rlim_max || 236 limp->rlim_max > alimp->rlim_max) 237 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 238 return (error); 239 if (limp->rlim_cur > limp->rlim_max) 240 limp->rlim_cur = limp->rlim_max; 241 if (p->p_limit->p_refcnt > 1 && 242 (p->p_limit->p_lflags & PL_SHAREMOD) == 0) { 243 p->p_limit->p_refcnt--; 244 p->p_limit = limcopy(p->p_limit); 245 alimp = &p->p_rlimit[which]; 246 } 247 248 switch (which) { 249 250 case RLIMIT_DATA: 251 if (limp->rlim_cur > maxdmap) 252 limp->rlim_cur = maxdmap; 253 if (limp->rlim_max > maxdmap) 254 limp->rlim_max = maxdmap; 255 break; 256 257 case RLIMIT_STACK: 258 if (limp->rlim_cur > maxsmap) 259 limp->rlim_cur = maxsmap; 260 if (limp->rlim_max > maxsmap) 261 limp->rlim_max = maxsmap; 262 /* 263 * Stack is allocated to the max at exec time with only 264 * "rlim_cur" bytes accessible. If stack limit is going 265 * up make more accessible, if going down make inaccessible. 266 */ 267 if (limp->rlim_cur != alimp->rlim_cur) { 268 vm_offset_t addr; 269 vm_size_t size; 270 vm_prot_t prot; 271 272 if (limp->rlim_cur > alimp->rlim_cur) { 273 prot = VM_PROT_ALL; 274 size = limp->rlim_cur - alimp->rlim_cur; 275 addr = USRSTACK - limp->rlim_cur; 276 } else { 277 prot = VM_PROT_NONE; 278 size = alimp->rlim_cur - limp->rlim_cur; 279 addr = USRSTACK - alimp->rlim_cur; 280 } 281 addr = trunc_page(addr); 282 size = round_page(size); 283 (void) vm_map_protect(&p->p_vmspace->vm_map, 284 addr, addr+size, prot, FALSE); 285 } 286 break; 287 288 case RLIMIT_NOFILE: 289 if (limp->rlim_cur > maxfiles) 290 limp->rlim_cur = maxfiles; 291 if (limp->rlim_max > maxfiles) 292 limp->rlim_max = maxfiles; 293 break; 294 295 case RLIMIT_NPROC: 296 if (limp->rlim_cur > maxproc) 297 limp->rlim_cur = maxproc; 298 if (limp->rlim_max > maxproc) 299 limp->rlim_max = maxproc; 300 break; 301 } 302 *alimp = *limp; 303 return (0); 304 } 305 306 /* ARGSUSED */ 307 int 308 sys_getrlimit(p, v, retval) 309 struct proc *p; 310 void *v; 311 register_t *retval; 312 { 313 register struct sys_getrlimit_args /* { 314 syscallarg(u_int) which; 315 syscallarg(struct rlimit *) rlp; 316 } */ *uap = v; 317 318 if (SCARG(uap, which) >= RLIM_NLIMITS) 319 return (EINVAL); 320 return (copyout((caddr_t)&p->p_rlimit[SCARG(uap, which)], 321 (caddr_t)SCARG(uap, rlp), sizeof (struct rlimit))); 322 } 323 324 /* 325 * Transform the running time and tick information in proc p into user, 326 * system, and interrupt time usage. 327 */ 328 void 329 calcru(p, up, sp, ip) 330 register struct proc *p; 331 register struct timeval *up; 332 register struct timeval *sp; 333 register struct timeval *ip; 334 { 335 register u_quad_t u, st, ut, it, tot; 336 register long sec, usec; 337 register int s; 338 struct timeval tv; 339 340 s = splstatclock(); 341 st = p->p_sticks; 342 ut = p->p_uticks; 343 it = p->p_iticks; 344 splx(s); 345 346 tot = st + ut + it; 347 if (tot == 0) { 348 up->tv_sec = up->tv_usec = 0; 349 sp->tv_sec = sp->tv_usec = 0; 350 if (ip != NULL) 351 ip->tv_sec = ip->tv_usec = 0; 352 return; 353 } 354 355 sec = p->p_rtime.tv_sec; 356 usec = p->p_rtime.tv_usec; 357 if (p == curproc) { 358 /* 359 * Adjust for the current time slice. This is actually fairly 360 * important since the error here is on the order of a time 361 * quantum, which is much greater than the sampling error. 362 */ 363 microtime(&tv); 364 sec += tv.tv_sec - runtime.tv_sec; 365 usec += tv.tv_usec - runtime.tv_usec; 366 } 367 u = (u_quad_t) sec * 1000000 + usec; 368 st = (u * st) / tot; 369 sp->tv_sec = st / 1000000; 370 sp->tv_usec = st % 1000000; 371 ut = (u * ut) / tot; 372 up->tv_sec = ut / 1000000; 373 up->tv_usec = ut % 1000000; 374 if (ip != NULL) { 375 it = (u * it) / tot; 376 ip->tv_sec = it / 1000000; 377 ip->tv_usec = it % 1000000; 378 } 379 } 380 381 /* ARGSUSED */ 382 int 383 sys_getrusage(p, v, retval) 384 register struct proc *p; 385 void *v; 386 register_t *retval; 387 { 388 register struct sys_getrusage_args /* { 389 syscallarg(int) who; 390 syscallarg(struct rusage *) rusage; 391 } */ *uap = v; 392 register struct rusage *rup; 393 394 switch (SCARG(uap, who)) { 395 396 case RUSAGE_SELF: 397 rup = &p->p_stats->p_ru; 398 calcru(p, &rup->ru_utime, &rup->ru_stime, NULL); 399 break; 400 401 case RUSAGE_CHILDREN: 402 rup = &p->p_stats->p_cru; 403 break; 404 405 default: 406 return (EINVAL); 407 } 408 return (copyout((caddr_t)rup, (caddr_t)SCARG(uap, rusage), 409 sizeof (struct rusage))); 410 } 411 412 void 413 ruadd(ru, ru2) 414 register struct rusage *ru, *ru2; 415 { 416 register long *ip, *ip2; 417 register int i; 418 419 timeradd(&ru->ru_utime, &ru2->ru_utime, &ru->ru_utime); 420 timeradd(&ru->ru_stime, &ru2->ru_stime, &ru->ru_stime); 421 if (ru->ru_maxrss < ru2->ru_maxrss) 422 ru->ru_maxrss = ru2->ru_maxrss; 423 ip = &ru->ru_first; ip2 = &ru2->ru_first; 424 for (i = &ru->ru_last - &ru->ru_first; i >= 0; i--) 425 *ip++ += *ip2++; 426 } 427 428 /* 429 * Make a copy of the plimit structure. 430 * We share these structures copy-on-write after fork, 431 * and copy when a limit is changed. 432 */ 433 struct plimit * 434 limcopy(lim) 435 struct plimit *lim; 436 { 437 register struct plimit *newlim; 438 439 MALLOC(newlim, struct plimit *, sizeof(struct plimit), 440 M_SUBPROC, M_WAITOK); 441 bcopy(lim->pl_rlimit, newlim->pl_rlimit, 442 sizeof(struct rlimit) * RLIM_NLIMITS); 443 newlim->p_lflags = 0; 444 newlim->p_refcnt = 1; 445 return (newlim); 446 } 447 448 void 449 limfree(lim) 450 struct plimit *lim; 451 { 452 453 if (--lim->p_refcnt > 0) 454 return; 455 FREE(lim, M_SUBPROC); 456 } 457
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