linux_ipc.c revision 1.24
1 /* $NetBSD: linux_ipc.c,v 1.24 2001/11/13 02:08:53 lukem 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> 40 __KERNEL_RCSID(0, "$NetBSD: linux_ipc.c,v 1.24 2001/11/13 02:08:53 lukem Exp $"); 41 42 #if defined(_KERNEL_OPT) 43 #include "opt_sysv.h" 44 #endif 45 46 #include <sys/types.h> 47 #include <sys/param.h> 48 #include <sys/shm.h> 49 #include <sys/sem.h> 50 #include <sys/msg.h> 51 #include <sys/proc.h> 52 #include <sys/systm.h> 53 54 #include <sys/mount.h> 55 #include <sys/syscallargs.h> 56 57 #include <compat/linux/common/linux_types.h> 58 #include <compat/linux/common/linux_signal.h> 59 #include <compat/linux/common/linux_util.h> 60 61 #include <compat/linux/linux_syscallargs.h> 62 #include <compat/linux/linux_syscall.h> 63 64 #include <compat/linux/common/linux_ipc.h> 65 #include <compat/linux/common/linux_msg.h> 66 #include <compat/linux/common/linux_shm.h> 67 #include <compat/linux/common/linux_sem.h> 68 #include <compat/linux/common/linux_ipccall.h> 69 70 /* 71 * Note: Not all linux architechtures have explicit versions 72 * of the SYSV* syscalls. On the ones that don't 73 * we pretend that they are defined anyway. *_args and 74 * prototypes are defined in individual headers; 75 * syscalls.master lists those syscalls as NOARGS. 76 * 77 * The functions in multiarch are the ones that just need 78 * the arguments shuffled around and then use the 79 * normal NetBSD syscall. 80 * 81 * Function in multiarch: 82 * linux_sys_ipc : linux_ipccall.c 83 * liunx_semop : linux_ipccall.c 84 * linux_semget : linux_ipccall.c 85 * linux_msgsnd : linux_ipccall.c 86 * linux_msgrcv : linux_ipccall.c 87 * linux_msgget : linux_ipccall.c 88 * linux_shmdt : linux_ipccall.c 89 * linux_shmget : linux_ipccall.c 90 */ 91 92 #if defined (SYSVSEM) || defined(SYSVSHM) || defined(SYSVMSG) 93 /* 94 * Convert between Linux and NetBSD ipc_perm structures. Only the 95 * order of the fields is different. 96 */ 97 void 98 linux_to_bsd_ipc_perm(lpp, bpp) 99 struct linux_ipc_perm *lpp; 100 struct ipc_perm *bpp; 101 { 102 103 bpp->_key = lpp->l_key; 104 bpp->uid = lpp->l_uid; 105 bpp->gid = lpp->l_gid; 106 bpp->cuid = lpp->l_cuid; 107 bpp->cgid = lpp->l_cgid; 108 bpp->mode = lpp->l_mode; 109 bpp->_seq = lpp->l_seq; 110 } 111 112 void 113 bsd_to_linux_ipc_perm(bpp, lpp) 114 struct ipc_perm *bpp; 115 struct linux_ipc_perm *lpp; 116 { 117 118 lpp->l_key = bpp->_key; 119 lpp->l_uid = bpp->uid; 120 lpp->l_gid = bpp->gid; 121 lpp->l_cuid = bpp->cuid; 122 lpp->l_cgid = bpp->cgid; 123 lpp->l_mode = bpp->mode; 124 lpp->l_seq = bpp->_seq; 125 } 126 #endif 127 128 #ifdef SYSVSEM 129 /* 130 * Semaphore operations. Most constants and structures are the same on 131 * both systems. Only semctl() needs some extra work. 132 */ 133 134 /* 135 * Convert between Linux and NetBSD semid_ds structures. 136 */ 137 void 138 bsd_to_linux_semid_ds(bs, ls) 139 struct semid_ds *bs; 140 struct linux_semid_ds *ls; 141 { 142 143 bsd_to_linux_ipc_perm(&bs->sem_perm, &ls->l_sem_perm); 144 ls->l_sem_otime = bs->sem_otime; 145 ls->l_sem_ctime = bs->sem_ctime; 146 ls->l_sem_nsems = bs->sem_nsems; 147 ls->l_sem_base = bs->_sem_base; 148 } 149 150 void 151 linux_to_bsd_semid_ds(ls, bs) 152 struct linux_semid_ds *ls; 153 struct semid_ds *bs; 154 { 155 156 linux_to_bsd_ipc_perm(&ls->l_sem_perm, &bs->sem_perm); 157 bs->sem_otime = ls->l_sem_otime; 158 bs->sem_ctime = ls->l_sem_ctime; 159 bs->sem_nsems = ls->l_sem_nsems; 160 bs->_sem_base = ls->l_sem_base; 161 } 162 163 /* 164 * Most of this can be handled by directly passing the arguments on; we 165 * just need to frob the `cmd' and convert the semid_ds and semun. 166 */ 167 int 168 linux_sys_semctl(p, v, retval) 169 struct proc *p; 170 void *v; 171 register_t *retval; 172 { 173 struct linux_sys_semctl_args /* { 174 syscallarg(int) semid; 175 syscallarg(int) semnum; 176 syscallarg(int) cmd; 177 syscallarg(union linux_semun) arg; 178 } */ *uap = v; 179 struct semid_ds sembuf; 180 struct linux_semid_ds lsembuf; 181 union __semun semun; 182 int cmd, error; 183 void *pass_arg = NULL; 184 185 cmd = SCARG(uap, cmd); 186 187 switch (cmd) { 188 case LINUX_IPC_SET: 189 pass_arg = &sembuf; 190 cmd = IPC_SET; 191 break; 192 193 case LINUX_IPC_STAT: 194 pass_arg = &sembuf; 195 cmd = IPC_STAT; 196 break; 197 198 case LINUX_IPC_RMID: 199 cmd = IPC_RMID; 200 break; 201 202 case LINUX_GETVAL: 203 cmd = GETVAL; 204 break; 205 206 case LINUX_GETPID: 207 cmd = GETPID; 208 break; 209 210 case LINUX_GETNCNT: 211 cmd = GETNCNT; 212 break; 213 214 case LINUX_GETZCNT: 215 cmd = GETZCNT; 216 break; 217 218 case LINUX_GETALL: 219 pass_arg = &semun; 220 semun.array = SCARG(uap, arg).l_array; 221 cmd = GETALL; 222 break; 223 224 case LINUX_SETVAL: 225 pass_arg = &semun; 226 semun.val = SCARG(uap, arg).l_val; 227 cmd = SETVAL; 228 break; 229 230 case LINUX_SETALL: 231 pass_arg = &semun; 232 semun.array = SCARG(uap, arg).l_array; 233 cmd = SETALL; 234 break; 235 236 default: 237 return (EINVAL); 238 } 239 240 if (cmd == IPC_SET) { 241 error = copyin(SCARG(uap, arg).l_buf, &lsembuf, 242 sizeof(lsembuf)); 243 if (error) 244 return (error); 245 linux_to_bsd_semid_ds(&lsembuf, &sembuf); 246 } 247 248 error = semctl1(p, SCARG(uap, semid), SCARG(uap, semnum), cmd, 249 pass_arg, retval); 250 251 if (error == 0 && cmd == IPC_STAT) { 252 bsd_to_linux_semid_ds(&sembuf, &lsembuf); 253 error = copyout(&lsembuf, SCARG(uap, arg).l_buf, 254 sizeof(lsembuf)); 255 } 256 257 return (error); 258 } 259 #endif /* SYSVSEM */ 260 261 #ifdef SYSVMSG 262 263 void 264 linux_to_bsd_msqid_ds(lmp, bmp) 265 struct linux_msqid_ds *lmp; 266 struct msqid_ds *bmp; 267 { 268 269 linux_to_bsd_ipc_perm(&lmp->l_msg_perm, &bmp->msg_perm); 270 bmp->_msg_first = lmp->l_msg_first; 271 bmp->_msg_last = lmp->l_msg_last; 272 bmp->_msg_cbytes = lmp->l_msg_cbytes; 273 bmp->msg_qnum = lmp->l_msg_qnum; 274 bmp->msg_qbytes = lmp->l_msg_qbytes; 275 bmp->msg_lspid = lmp->l_msg_lspid; 276 bmp->msg_lrpid = lmp->l_msg_lrpid; 277 bmp->msg_stime = lmp->l_msg_stime; 278 bmp->msg_rtime = lmp->l_msg_rtime; 279 bmp->msg_ctime = lmp->l_msg_ctime; 280 } 281 282 void 283 bsd_to_linux_msqid_ds(bmp, lmp) 284 struct msqid_ds *bmp; 285 struct linux_msqid_ds *lmp; 286 { 287 288 bsd_to_linux_ipc_perm(&bmp->msg_perm, &lmp->l_msg_perm); 289 lmp->l_msg_first = bmp->_msg_first; 290 lmp->l_msg_last = bmp->_msg_last; 291 lmp->l_msg_cbytes = bmp->_msg_cbytes; 292 lmp->l_msg_qnum = bmp->msg_qnum; 293 lmp->l_msg_qbytes = bmp->msg_qbytes; 294 lmp->l_msg_lspid = bmp->msg_lspid; 295 lmp->l_msg_lrpid = bmp->msg_lrpid; 296 lmp->l_msg_stime = bmp->msg_stime; 297 lmp->l_msg_rtime = bmp->msg_rtime; 298 lmp->l_msg_ctime = bmp->msg_ctime; 299 } 300 301 int 302 linux_sys_msgctl(p, v, retval) 303 struct proc *p; 304 void *v; 305 register_t *retval; 306 { 307 struct linux_sys_msgctl_args /* { 308 syscallarg(int) msqid; 309 syscallarg(int) cmd; 310 syscallarg(struct linux_msqid_ds *) buf; 311 } */ *uap = v; 312 caddr_t sg; 313 struct sys___msgctl13_args nua; 314 struct msqid_ds *bmp, bm; 315 struct linux_msqid_ds lm; 316 int error; 317 318 SCARG(&nua, msqid) = SCARG(uap, msqid); 319 switch (SCARG(uap, cmd)) { 320 case LINUX_IPC_STAT: 321 sg = stackgap_init(p->p_emul); 322 bmp = stackgap_alloc(&sg, sizeof (struct msqid_ds)); 323 SCARG(&nua, cmd) = IPC_STAT; 324 SCARG(&nua, buf) = bmp; 325 if ((error = sys___msgctl13(p, &nua, retval))) 326 return error; 327 if ((error = copyin(bmp, &bm, sizeof bm))) 328 return error; 329 bsd_to_linux_msqid_ds(&bm, &lm); 330 return copyout(&lm, SCARG(uap, buf), sizeof lm); 331 case LINUX_IPC_SET: 332 if ((error = copyin(SCARG(uap, buf), &lm, sizeof lm))) 333 return error; 334 linux_to_bsd_msqid_ds(&lm, &bm); 335 sg = stackgap_init(p->p_emul); 336 bmp = stackgap_alloc(&sg, sizeof bm); 337 if ((error = copyout(&bm, bmp, sizeof bm))) 338 return error; 339 SCARG(&nua, cmd) = IPC_SET; 340 SCARG(&nua, buf) = bmp; 341 break; 342 case LINUX_IPC_RMID: 343 SCARG(&nua, cmd) = IPC_RMID; 344 SCARG(&nua, buf) = NULL; 345 break; 346 default: 347 return EINVAL; 348 } 349 return sys___msgctl13(p, &nua, retval); 350 } 351 #endif /* SYSVMSG */ 352 353 #ifdef SYSVSHM 354 /* 355 * shmat(2). Very straightforward, except that Linux passes a pointer 356 * in which the return value is to be passed. This is subsequently 357 * handled by libc, apparently. 358 */ 359 int 360 linux_sys_shmat(p, v, retval) 361 struct proc *p; 362 void *v; 363 register_t *retval; 364 { 365 struct linux_sys_shmat_args /* { 366 syscallarg(int) shmid; 367 syscallarg(void *) shmaddr; 368 syscallarg(int) shmflg; 369 syscallarg(u_long *) raddr; 370 } */ *uap = v; 371 int error; 372 373 if ((error = sys_shmat(p, uap, retval))) 374 return error; 375 376 if ((error = copyout(&retval[0], (caddr_t) SCARG(uap, raddr), 377 sizeof retval[0]))) 378 return error; 379 380 retval[0] = 0; 381 return 0; 382 } 383 384 /* 385 * Convert between Linux and NetBSD shmid_ds structures. 386 * The order of the fields is once again the difference, and 387 * we also need a place to store the internal data pointer 388 * in, which is unfortunately stored in this structure. 389 * 390 * We abuse a Linux internal field for that. 391 */ 392 void 393 linux_to_bsd_shmid_ds(lsp, bsp) 394 struct linux_shmid_ds *lsp; 395 struct shmid_ds *bsp; 396 { 397 398 linux_to_bsd_ipc_perm(&lsp->l_shm_perm, &bsp->shm_perm); 399 bsp->shm_segsz = lsp->l_shm_segsz; 400 bsp->shm_lpid = lsp->l_shm_lpid; 401 bsp->shm_cpid = lsp->l_shm_cpid; 402 bsp->shm_nattch = lsp->l_shm_nattch; 403 bsp->shm_atime = lsp->l_shm_atime; 404 bsp->shm_dtime = lsp->l_shm_dtime; 405 bsp->shm_ctime = lsp->l_shm_ctime; 406 bsp->_shm_internal = lsp->l_private2; /* XXX Oh well. */ 407 } 408 409 void 410 bsd_to_linux_shmid_ds(bsp, lsp) 411 struct shmid_ds *bsp; 412 struct linux_shmid_ds *lsp; 413 { 414 415 bsd_to_linux_ipc_perm(&bsp->shm_perm, &lsp->l_shm_perm); 416 lsp->l_shm_segsz = bsp->shm_segsz; 417 lsp->l_shm_lpid = bsp->shm_lpid; 418 lsp->l_shm_cpid = bsp->shm_cpid; 419 lsp->l_shm_nattch = bsp->shm_nattch; 420 lsp->l_shm_atime = bsp->shm_atime; 421 lsp->l_shm_dtime = bsp->shm_dtime; 422 lsp->l_shm_ctime = bsp->shm_ctime; 423 lsp->l_private2 = bsp->_shm_internal; /* XXX */ 424 } 425 426 /* 427 * shmctl. Not implemented (for now): IPC_INFO, SHM_INFO, SHM_STAT 428 * SHM_LOCK and SHM_UNLOCK are passed on, but currently not implemented 429 * by NetBSD itself. 430 * 431 * The usual structure conversion and massaging is done. 432 */ 433 int 434 linux_sys_shmctl(p, v, retval) 435 struct proc *p; 436 void *v; 437 register_t *retval; 438 { 439 struct linux_sys_shmctl_args /* { 440 syscallarg(int) shmid; 441 syscallarg(int) cmd; 442 syscallarg(struct linux_shmid_ds *) buf; 443 } */ *uap = v; 444 caddr_t sg; 445 struct sys___shmctl13_args nua; 446 struct shmid_ds *bsp, bs; 447 struct linux_shmid_ds ls; 448 int error; 449 450 SCARG(&nua, shmid) = SCARG(uap, shmid); 451 switch (SCARG(uap, cmd)) { 452 case LINUX_IPC_STAT: 453 sg = stackgap_init(p->p_emul); 454 bsp = stackgap_alloc(&sg, sizeof(struct shmid_ds)); 455 SCARG(&nua, cmd) = IPC_STAT; 456 SCARG(&nua, buf) = bsp; 457 if ((error = sys___shmctl13(p, &nua, retval))) 458 return error; 459 if ((error = copyin(SCARG(&nua, buf), &bs, sizeof bs))) 460 return error; 461 bsd_to_linux_shmid_ds(&bs, &ls); 462 return copyout(&ls, SCARG(uap, buf), sizeof ls); 463 case LINUX_IPC_SET: 464 if ((error = copyin(SCARG(uap, buf), &ls, sizeof ls))) 465 return error; 466 linux_to_bsd_shmid_ds(&ls, &bs); 467 sg = stackgap_init(p->p_emul); 468 bsp = stackgap_alloc(&sg, sizeof bs); 469 if ((error = copyout(&bs, bsp, sizeof bs))) 470 return error; 471 SCARG(&nua, cmd) = IPC_SET; 472 SCARG(&nua, buf) = bsp; 473 break; 474 case LINUX_IPC_RMID: 475 SCARG(&nua, cmd) = IPC_RMID; 476 SCARG(&nua, buf) = NULL; 477 break; 478 case LINUX_SHM_LOCK: 479 SCARG(&nua, cmd) = SHM_LOCK; 480 SCARG(&nua, buf) = NULL; 481 break; 482 case LINUX_SHM_UNLOCK: 483 SCARG(&nua, cmd) = SHM_UNLOCK; 484 SCARG(&nua, buf) = NULL; 485 break; 486 case LINUX_IPC_INFO: 487 case LINUX_SHM_STAT: 488 case LINUX_SHM_INFO: 489 default: 490 return EINVAL; 491 } 492 return sys___shmctl13(p, &nua, retval); 493 } 494 #endif /* SYSVSHM */ 495
Indexes created Tue Sep 23 14:10:03 GMT 2025