1 /* $NetBSD: linux_ipc.c,v 1.50 2008/04/28 20:23:43 martin Exp $ */ 2 3 /*- 4 * Copyright (c) 1995, 1998 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Frank van der Linden and Eric Haszlakiewicz. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __KERNEL_RCSID(0, "$NetBSD: linux_ipc.c,v 1.50 2008/04/28 20:23:43 martin Exp $"); 34 35 #if defined(_KERNEL_OPT) 36 #include "opt_sysv.h" 37 #endif 38 39 #include <sys/param.h> 40 #include <sys/shm.h> 41 #include <sys/sem.h> 42 #include <sys/msg.h> 43 #include <sys/proc.h> 44 #include <sys/systm.h> 45 #include <sys/vnode.h> 46 47 #include <sys/mount.h> 48 #include <sys/syscallargs.h> 49 50 #include <compat/linux/common/linux_types.h> 51 #include <compat/linux/common/linux_signal.h> 52 #include <compat/linux/common/linux_util.h> 53 #include <compat/linux/common/linux_ipc.h> 54 #include <compat/linux/common/linux_msg.h> 55 #include <compat/linux/common/linux_shm.h> 56 #include <compat/linux/common/linux_sem.h> 57 58 #include <compat/linux/linux_syscallargs.h> 59 #include <compat/linux/linux_syscall.h> 60 61 #include <compat/linux/common/linux_ipccall.h> 62 #include <compat/linux/common/linux_machdep.h> 63 64 /* 65 * Note: Not all linux architechtures have explicit versions 66 * of the SYSV* syscalls. On the ones that don't 67 * we pretend that they are defined anyway. *_args and 68 * prototypes are defined in individual headers; 69 * syscalls.master lists those syscalls as NOARGS. 70 * 71 * The functions in multiarch are the ones that just need 72 * the arguments shuffled around and then use the 73 * normal NetBSD syscall. 74 * 75 * Function in multiarch: 76 * linux_sys_ipc : linux_ipccall.c 77 * liunx_semop : linux_ipccall.c 78 * linux_semget : linux_ipccall.c 79 * linux_msgsnd : linux_ipccall.c 80 * linux_msgrcv : linux_ipccall.c 81 * linux_msgget : linux_ipccall.c 82 * linux_shmdt : linux_ipccall.c 83 * linux_shmget : linux_ipccall.c 84 */ 85 86 #if defined (SYSVSEM) || defined(SYSVSHM) || defined(SYSVMSG) 87 /* 88 * Convert between Linux and NetBSD ipc_perm structures. Only the 89 * order of the fields is different. 90 */ 91 void 92 linux_to_bsd_ipc_perm(struct linux_ipc_perm *lpp, struct ipc_perm *bpp) 93 { 94 95 bpp->_key = lpp->l_key; 96 bpp->uid = lpp->l_uid; 97 bpp->gid = lpp->l_gid; 98 bpp->cuid = lpp->l_cuid; 99 bpp->cgid = lpp->l_cgid; 100 bpp->mode = lpp->l_mode; 101 bpp->_seq = lpp->l_seq; 102 } 103 104 void 105 linux_to_bsd_ipc64_perm(struct linux_ipc64_perm *lpp, struct ipc_perm *bpp) 106 { 107 bpp->_key = lpp->l_key; 108 bpp->uid = lpp->l_uid; 109 bpp->gid = lpp->l_gid; 110 bpp->cuid = lpp->l_cuid; 111 bpp->cgid = lpp->l_cgid; 112 bpp->mode = lpp->l_mode; 113 bpp->_seq = lpp->l_seq; 114 } 115 116 void 117 bsd_to_linux_ipc_perm(struct ipc_perm *bpp, struct linux_ipc_perm *lpp) 118 { 119 120 lpp->l_key = bpp->_key; 121 lpp->l_uid = bpp->uid; 122 lpp->l_gid = bpp->gid; 123 lpp->l_cuid = bpp->cuid; 124 lpp->l_cgid = bpp->cgid; 125 lpp->l_mode = bpp->mode; 126 lpp->l_seq = bpp->_seq; 127 } 128 129 void 130 bsd_to_linux_ipc64_perm(struct ipc_perm *bpp, struct linux_ipc64_perm *lpp) 131 { 132 lpp->l_key = bpp->_key; 133 lpp->l_uid = bpp->uid; 134 lpp->l_gid = bpp->gid; 135 lpp->l_cuid = bpp->cuid; 136 lpp->l_cgid = bpp->cgid; 137 lpp->l_mode = bpp->mode; 138 lpp->l_seq = bpp->_seq; 139 } 140 141 #endif 142 143 #ifdef SYSVSEM 144 /* 145 * Semaphore operations. Most constants and structures are the same on 146 * both systems. Only semctl() needs some extra work. 147 */ 148 149 /* 150 * Convert between Linux and NetBSD semid_ds structures. 151 */ 152 void 153 bsd_to_linux_semid_ds(struct semid_ds *bs, struct linux_semid_ds *ls) 154 { 155 bsd_to_linux_ipc_perm(&bs->sem_perm, &ls->l_sem_perm); 156 ls->l_sem_otime = bs->sem_otime; 157 ls->l_sem_ctime = bs->sem_ctime; 158 ls->l_sem_nsems = bs->sem_nsems; 159 ls->l_sem_base = bs->_sem_base; 160 } 161 162 void 163 bsd_to_linux_semid64_ds(struct semid_ds *bs, struct linux_semid64_ds *ls) 164 { 165 bsd_to_linux_ipc64_perm(&bs->sem_perm, &ls->l_sem_perm); 166 ls->l_sem_otime = bs->sem_otime; 167 ls->l_sem_ctime = bs->sem_ctime; 168 ls->l_sem_nsems = bs->sem_nsems; 169 } 170 171 void 172 linux_to_bsd_semid_ds(struct linux_semid_ds *ls, struct semid_ds *bs) 173 { 174 linux_to_bsd_ipc_perm(&ls->l_sem_perm, &bs->sem_perm); 175 bs->sem_otime = ls->l_sem_otime; 176 bs->sem_ctime = ls->l_sem_ctime; 177 bs->sem_nsems = ls->l_sem_nsems; 178 bs->_sem_base = ls->l_sem_base; 179 } 180 181 void 182 linux_to_bsd_semid64_ds(struct linux_semid64_ds *ls, struct semid_ds *bs) 183 { 184 linux_to_bsd_ipc64_perm(&ls->l_sem_perm, &bs->sem_perm); 185 bs->sem_otime = ls->l_sem_otime; 186 bs->sem_ctime = ls->l_sem_ctime; 187 bs->sem_nsems = ls->l_sem_nsems; 188 } 189 190 /* 191 * Most of this can be handled by directly passing the arguments on; we 192 * just need to frob the `cmd' and convert the semid_ds and semun. 193 */ 194 int 195 linux_sys_semctl(struct lwp *l, const struct linux_sys_semctl_args *uap, register_t *retval) 196 { 197 /* { 198 syscallarg(int) semid; 199 syscallarg(int) semnum; 200 syscallarg(int) cmd; 201 syscallarg(union linux_semun) arg; 202 } */ 203 struct semid_ds sembuf; 204 struct linux_semid_ds lsembuf; 205 struct linux_semid64_ds lsembuf64; 206 union __semun semun; 207 int cmd, lcmd, error; 208 void *pass_arg = NULL; 209 210 lcmd = SCARG(uap, cmd); 211 #ifdef LINUX_IPC_FORCE64 212 if (lcmd == LINUX_IPC_STAT || lcmd == LINUX_IPC_SET) 213 lcmd |= LINUX_IPC_64; 214 #endif 215 216 switch (lcmd) { 217 case LINUX_IPC_SET: 218 error = copyin(SCARG(uap, arg).l_buf, &lsembuf, 219 sizeof(lsembuf)); 220 if (error) 221 return (error); 222 linux_to_bsd_semid_ds(&lsembuf, &sembuf); 223 pass_arg = &sembuf; 224 cmd = IPC_SET; 225 break; 226 227 case LINUX_IPC_SET | LINUX_IPC_64: 228 error = copyin(SCARG(uap, arg).l_buf, &lsembuf64, 229 sizeof(lsembuf64)); 230 if (error) 231 return (error); 232 linux_to_bsd_semid64_ds(&lsembuf64, &sembuf); 233 pass_arg = &sembuf; 234 cmd = IPC_SET; 235 break; 236 237 case LINUX_IPC_STAT: 238 case LINUX_IPC_STAT | LINUX_IPC_64: 239 pass_arg = &sembuf; 240 cmd = IPC_STAT; 241 break; 242 243 case LINUX_IPC_RMID: 244 cmd = IPC_RMID; 245 break; 246 247 case LINUX_GETVAL: 248 cmd = GETVAL; 249 break; 250 251 case LINUX_GETPID: 252 cmd = GETPID; 253 break; 254 255 case LINUX_GETNCNT: 256 cmd = GETNCNT; 257 break; 258 259 case LINUX_GETZCNT: 260 cmd = GETZCNT; 261 break; 262 263 case LINUX_GETALL: 264 pass_arg = &semun; 265 semun.array = SCARG(uap, arg).l_array; 266 cmd = GETALL; 267 break; 268 269 case LINUX_SETVAL: 270 pass_arg = &semun; 271 semun.val = SCARG(uap, arg).l_val; 272 cmd = SETVAL; 273 break; 274 275 case LINUX_SETALL: 276 pass_arg = &semun; 277 semun.array = SCARG(uap, arg).l_array; 278 cmd = SETALL; 279 break; 280 281 default: 282 return (EINVAL); 283 } 284 285 error = semctl1(l, SCARG(uap, semid), SCARG(uap, semnum), cmd, 286 pass_arg, retval); 287 if (error) 288 return error; 289 290 switch (lcmd) { 291 case LINUX_IPC_STAT: 292 bsd_to_linux_semid_ds(&sembuf, &lsembuf); 293 error = copyout(&lsembuf, SCARG(uap, arg).l_buf, 294 sizeof(lsembuf)); 295 break; 296 case LINUX_IPC_STAT | LINUX_IPC_64: 297 bsd_to_linux_semid64_ds(&sembuf, &lsembuf64); 298 error = copyout(&lsembuf64, SCARG(uap, arg).l_buf, 299 sizeof(lsembuf64)); 300 break; 301 default: 302 break; 303 } 304 305 return (error); 306 } 307 #endif /* SYSVSEM */ 308 309 #ifdef SYSVMSG 310 311 void 312 linux_to_bsd_msqid_ds(struct linux_msqid_ds *lmp, struct msqid_ds *bmp) 313 { 314 315 linux_to_bsd_ipc_perm(&lmp->l_msg_perm, &bmp->msg_perm); 316 bmp->_msg_first = lmp->l_msg_first; 317 bmp->_msg_last = lmp->l_msg_last; 318 bmp->_msg_cbytes = lmp->l_msg_cbytes; 319 bmp->msg_qnum = lmp->l_msg_qnum; 320 bmp->msg_qbytes = lmp->l_msg_qbytes; 321 bmp->msg_lspid = lmp->l_msg_lspid; 322 bmp->msg_lrpid = lmp->l_msg_lrpid; 323 bmp->msg_stime = lmp->l_msg_stime; 324 bmp->msg_rtime = lmp->l_msg_rtime; 325 bmp->msg_ctime = lmp->l_msg_ctime; 326 } 327 328 void 329 bsd_to_linux_msqid_ds(struct msqid_ds *bmp, struct linux_msqid_ds *lmp) 330 { 331 332 bsd_to_linux_ipc_perm(&bmp->msg_perm, &lmp->l_msg_perm); 333 lmp->l_msg_first = bmp->_msg_first; 334 lmp->l_msg_last = bmp->_msg_last; 335 lmp->l_msg_cbytes = bmp->_msg_cbytes; 336 lmp->l_msg_qnum = bmp->msg_qnum; 337 lmp->l_msg_qbytes = bmp->msg_qbytes; 338 lmp->l_msg_lspid = bmp->msg_lspid; 339 lmp->l_msg_lrpid = bmp->msg_lrpid; 340 lmp->l_msg_stime = bmp->msg_stime; 341 lmp->l_msg_rtime = bmp->msg_rtime; 342 lmp->l_msg_ctime = bmp->msg_ctime; 343 } 344 345 int 346 linux_sys_msgctl(struct lwp *l, const struct linux_sys_msgctl_args *uap, register_t *retval) 347 { 348 /* { 349 syscallarg(int) msqid; 350 syscallarg(int) cmd; 351 syscallarg(struct linux_msqid_ds *) buf; 352 } */ 353 struct msqid_ds bm; 354 struct linux_msqid_ds lm; 355 int error; 356 357 switch (SCARG(uap, cmd)) { 358 case LINUX_IPC_STAT: 359 error = msgctl1(l, SCARG(uap, msqid), IPC_STAT, &bm); 360 if (error == 0) { 361 bsd_to_linux_msqid_ds(&bm, &lm); 362 error = copyout(&lm, SCARG(uap, buf), sizeof lm); 363 } 364 return error; 365 case LINUX_IPC_SET: 366 if ((error = copyin(SCARG(uap, buf), &lm, sizeof lm))) 367 return error; 368 linux_to_bsd_msqid_ds(&lm, &bm); 369 return msgctl1(l, SCARG(uap, msqid), IPC_SET, &bm); 370 case LINUX_IPC_RMID: 371 return msgctl1(l, SCARG(uap, msqid), IPC_RMID, NULL); 372 break; 373 default: 374 return EINVAL; 375 } 376 } 377 #endif /* SYSVMSG */ 378 379 #ifdef SYSVSHM 380 /* 381 * shmget(2). Just make sure the Linux-compatible shmat() semantics 382 * is enabled for the segment, so that shmat() succeeds even when 383 * the segment would be removed. 384 */ 385 int 386 linux_sys_shmget(struct lwp *l, const struct linux_sys_shmget_args *uap, register_t *retval) 387 { 388 /* { 389 syscallarg(key_t) key; 390 syscallarg(size_t) size; 391 syscallarg(int) shmflg; 392 } */ 393 struct sys_shmget_args bsd_ua; 394 395 SCARG(&bsd_ua, key) = SCARG(uap, key); 396 SCARG(&bsd_ua, size) = SCARG(uap, size); 397 SCARG(&bsd_ua, shmflg) = SCARG(uap, shmflg) | _SHM_RMLINGER; 398 399 return sys_shmget(l, &bsd_ua, retval); 400 } 401 402 /* 403 * shmat(2). Very straightforward, except that Linux passes a pointer 404 * in which the return value is to be passed. This is subsequently 405 * handled by libc, apparently. 406 */ 407 #ifndef __amd64__ 408 int 409 linux_sys_shmat(struct lwp *l, const struct linux_sys_shmat_args *uap, register_t *retval) 410 { 411 /* { 412 syscallarg(int) shmid; 413 syscallarg(void *) shmaddr; 414 syscallarg(int) shmflg; 415 syscallarg(u_long *) raddr; 416 } */ 417 int error; 418 419 if ((error = sys_shmat(l, (const void *)uap, retval))) 420 return error; 421 422 if ((error = copyout(&retval[0], SCARG(uap, raddr), sizeof retval[0]))) 423 return error; 424 425 retval[0] = 0; 426 return 0; 427 } 428 #endif /* __amd64__ */ 429 430 /* 431 * Convert between Linux and NetBSD shmid_ds structures. 432 * The order of the fields is once again the difference, and 433 * we also need a place to store the internal data pointer 434 * in, which is unfortunately stored in this structure. 435 * 436 * We abuse a Linux internal field for that. 437 */ 438 void 439 linux_to_bsd_shmid_ds(struct linux_shmid_ds *lsp, struct shmid_ds *bsp) 440 { 441 442 linux_to_bsd_ipc_perm(&lsp->l_shm_perm, &bsp->shm_perm); 443 bsp->shm_segsz = lsp->l_shm_segsz; 444 bsp->shm_lpid = lsp->l_shm_lpid; 445 bsp->shm_cpid = lsp->l_shm_cpid; 446 bsp->shm_nattch = lsp->l_shm_nattch; 447 bsp->shm_atime = lsp->l_shm_atime; 448 bsp->shm_dtime = lsp->l_shm_dtime; 449 bsp->shm_ctime = lsp->l_shm_ctime; 450 bsp->_shm_internal = lsp->l_private2; /* XXX Oh well. */ 451 } 452 453 void 454 linux_to_bsd_shmid64_ds(struct linux_shmid64_ds *lsp, struct shmid_ds *bsp) 455 { 456 457 linux_to_bsd_ipc64_perm(&lsp->l_shm_perm, &bsp->shm_perm); 458 bsp->shm_segsz = lsp->l_shm_segsz; 459 bsp->shm_lpid = lsp->l_shm_lpid; 460 bsp->shm_cpid = lsp->l_shm_cpid; 461 bsp->shm_nattch = lsp->l_shm_nattch; 462 bsp->shm_atime = lsp->l_shm_atime; 463 bsp->shm_dtime = lsp->l_shm_dtime; 464 bsp->shm_ctime = lsp->l_shm_ctime; 465 bsp->_shm_internal = (void*)lsp->l___unused5; /* XXX Oh well. */ 466 } 467 468 void 469 bsd_to_linux_shmid_ds(struct shmid_ds *bsp, struct linux_shmid_ds *lsp) 470 { 471 472 bsd_to_linux_ipc_perm(&bsp->shm_perm, &lsp->l_shm_perm); 473 lsp->l_shm_segsz = bsp->shm_segsz; 474 lsp->l_shm_lpid = bsp->shm_lpid; 475 lsp->l_shm_cpid = bsp->shm_cpid; 476 lsp->l_shm_nattch = bsp->shm_nattch; 477 lsp->l_shm_atime = bsp->shm_atime; 478 lsp->l_shm_dtime = bsp->shm_dtime; 479 lsp->l_shm_ctime = bsp->shm_ctime; 480 lsp->l_private2 = bsp->_shm_internal; /* XXX */ 481 } 482 483 void 484 bsd_to_linux_shmid64_ds(struct shmid_ds *bsp, struct linux_shmid64_ds *lsp) 485 { 486 bsd_to_linux_ipc64_perm(&bsp->shm_perm, &lsp->l_shm_perm); 487 lsp->l_shm_segsz = bsp->shm_segsz; 488 lsp->l_shm_lpid = bsp->shm_lpid; 489 lsp->l_shm_cpid = bsp->shm_cpid; 490 lsp->l_shm_nattch = bsp->shm_nattch; 491 lsp->l_shm_atime = bsp->shm_atime; 492 lsp->l_shm_dtime = bsp->shm_dtime; 493 lsp->l_shm_ctime = bsp->shm_ctime; 494 lsp->l___unused5 = (u_long)bsp->_shm_internal; /* XXX */ 495 } 496 497 /* 498 * shmctl. 499 * 500 * The usual structure conversion and massaging is done. 501 */ 502 int 503 linux_sys_shmctl(struct lwp *l, const struct linux_sys_shmctl_args *uap, register_t *retval) 504 { 505 /* { 506 syscallarg(int) shmid; 507 syscallarg(int) cmd; 508 syscallarg(struct linux_shmid_ds *) buf; 509 } */ 510 struct shmid_ds bs; 511 struct linux_shmid_ds ls; 512 struct linux_shmid64_ds ls64; 513 struct linux_shminfo64 lsi64; 514 struct linux_shm_info lsi; 515 int error, i, cmd, shmid; 516 517 shmid = SCARG(uap, shmid); 518 cmd = SCARG(uap, cmd); 519 #ifdef LINUX_IPC_FORCE64 520 if (cmd == LINUX_IPC_STAT || cmd == LINUX_SHM_STAT || 521 cmd == LINUX_IPC_SET) 522 cmd |= LINUX_IPC_64; 523 #endif 524 525 switch (cmd) { 526 case LINUX_IPC_STAT: 527 case LINUX_SHM_STAT: 528 if (cmd == LINUX_SHM_STAT) { 529 shmid = IXSEQ_TO_IPCID(shmid, shmsegs[shmid].shm_perm); 530 retval[0] = shmid; 531 } 532 error = shmctl1(l, shmid, IPC_STAT, &bs); 533 if (error != 0) 534 return error; 535 bsd_to_linux_shmid_ds(&bs, &ls); 536 return copyout(&ls, SCARG(uap, buf), sizeof ls); 537 538 case LINUX_IPC_STAT | LINUX_IPC_64: 539 case LINUX_SHM_STAT | LINUX_IPC_64: 540 if (cmd == (LINUX_SHM_STAT | LINUX_IPC_64)) { 541 shmid = IXSEQ_TO_IPCID(shmid, shmsegs[shmid].shm_perm); 542 retval[0] = shmid; 543 } 544 error = shmctl1(l, shmid, IPC_STAT, &bs); 545 if (error != 0) 546 return error; 547 bsd_to_linux_shmid64_ds(&bs, &ls64); 548 return copyout(&ls64, SCARG(uap, buf), sizeof ls64); 549 550 case LINUX_IPC_SET: 551 if ((error = copyin(SCARG(uap, buf), &ls, sizeof ls))) 552 return error; 553 linux_to_bsd_shmid_ds(&ls, &bs); 554 return shmctl1(l, shmid, IPC_SET, &bs); 555 556 case LINUX_IPC_SET | LINUX_IPC_64: 557 if ((error = copyin(SCARG(uap, buf), &ls64, sizeof ls64))) 558 return error; 559 linux_to_bsd_shmid64_ds(&ls64, &bs); 560 return shmctl1(l, shmid, IPC_SET, &bs); 561 562 case LINUX_IPC_RMID: 563 return shmctl1(l, shmid, IPC_RMID, NULL); 564 565 case LINUX_SHM_LOCK: 566 return shmctl1(l, shmid, SHM_LOCK, NULL); 567 568 case LINUX_SHM_UNLOCK: 569 return shmctl1(l, shmid, SHM_UNLOCK, NULL); 570 571 case LINUX_IPC_INFO: 572 memset(&lsi64, 0, sizeof lsi64); 573 lsi64.l_shmmax = shminfo.shmmax; 574 lsi64.l_shmmin = shminfo.shmmin; 575 lsi64.l_shmmni = shminfo.shmmni; 576 lsi64.l_shmseg = shminfo.shmseg; 577 lsi64.l_shmall = shminfo.shmall; 578 for (i = shminfo.shmmni - 1; i > 0; i--) 579 if (shmsegs[i].shm_perm.mode & SHMSEG_ALLOCATED) 580 break; 581 retval[0] = i; 582 return copyout(&lsi64, SCARG(uap, buf), sizeof lsi64); 583 584 case LINUX_SHM_INFO: 585 (void)memset(&lsi, 0, sizeof lsi); 586 lsi.l_used_ids = shm_nused; 587 for (i = 0; i < shminfo.shmmni; i++) 588 if (shmsegs[i].shm_perm.mode & SHMSEG_ALLOCATED) 589 lsi.l_shm_tot += 590 round_page(shmsegs[i].shm_segsz) / 591 uvmexp.pagesize; 592 lsi.l_shm_rss = 0; 593 lsi.l_shm_swp = 0; 594 lsi.l_swap_attempts = 0; 595 lsi.l_swap_successes = 0; 596 for (i = shminfo.shmmni - 1; i > 0; i--) 597 if (shmsegs[i].shm_perm.mode & SHMSEG_ALLOCATED) 598 break; 599 retval[0] = i; 600 return copyout(&lsi, SCARG(uap, buf), sizeof lsi); 601 602 default: 603 #ifdef DEBUG 604 printf("linux_sys_shmctl cmd %d\n", SCARG(uap, cmd)); 605 #endif 606 return EINVAL; 607 } 608 } 609 #endif /* SYSVSHM */ 610