| 1 | /* $FreeBSD: src/sys/kern/sysv_msg.c,v 1.23.2.5 2002/12/31 08:54:53 maxim Exp $ */ |
| 2 | /* $DragonFly: src/sys/kern/sysv_msg.c,v 1.4 2003/06/25 03:55:57 dillon Exp $ */ |
| 3 | |
| 4 | /* |
| 5 | * Implementation of SVID messages |
| 6 | * |
| 7 | * Author: Daniel Boulet |
| 8 | * |
| 9 | * Copyright 1993 Daniel Boulet and RTMX Inc. |
| 10 | * |
| 11 | * This system call was implemented by Daniel Boulet under contract from RTMX. |
| 12 | * |
| 13 | * Redistribution and use in source forms, with and without modification, |
| 14 | * are permitted provided that this entire comment appears intact. |
| 15 | * |
| 16 | * Redistribution in binary form may occur without any restrictions. |
| 17 | * Obviously, it would be nice if you gave credit where credit is due |
| 18 | * but requiring it would be too onerous. |
| 19 | * |
| 20 | * This software is provided ``AS IS'' without any warranties of any kind. |
| 21 | */ |
| 22 | |
| 23 | #include "opt_sysvipc.h" |
| 24 | |
| 25 | #include <sys/param.h> |
| 26 | #include <sys/systm.h> |
| 27 | #include <sys/sysproto.h> |
| 28 | #include <sys/kernel.h> |
| 29 | #include <sys/proc.h> |
| 30 | #include <sys/msg.h> |
| 31 | #include <sys/sysent.h> |
| 32 | #include <sys/sysctl.h> |
| 33 | #include <sys/malloc.h> |
| 34 | #include <sys/jail.h> |
| 35 | |
| 36 | static MALLOC_DEFINE(M_MSG, "msg", "SVID compatible message queues"); |
| 37 | |
| 38 | static void msginit __P((void *)); |
| 39 | |
| 40 | #define MSG_DEBUG |
| 41 | #undef MSG_DEBUG_OK |
| 42 | |
| 43 | static void msg_freehdr __P((struct msg *msghdr)); |
| 44 | |
| 45 | /* XXX casting to (sy_call_t *) is bogus, as usual. */ |
| 46 | static sy_call_t *msgcalls[] = { |
| 47 | (sy_call_t *)msgctl, (sy_call_t *)msgget, |
| 48 | (sy_call_t *)msgsnd, (sy_call_t *)msgrcv |
| 49 | }; |
| 50 | |
| 51 | struct msg { |
| 52 | struct msg *msg_next; /* next msg in the chain */ |
| 53 | long msg_type; /* type of this message */ |
| 54 | /* >0 -> type of this message */ |
| 55 | /* 0 -> free header */ |
| 56 | u_short msg_ts; /* size of this message */ |
| 57 | short msg_spot; /* location of start of msg in buffer */ |
| 58 | }; |
| 59 | |
| 60 | |
| 61 | #ifndef MSGSSZ |
| 62 | #define MSGSSZ 8 /* Each segment must be 2^N long */ |
| 63 | #endif |
| 64 | #ifndef MSGSEG |
| 65 | #define MSGSEG 2048 /* must be less than 32767 */ |
| 66 | #endif |
| 67 | #define MSGMAX (MSGSSZ*MSGSEG) |
| 68 | #ifndef MSGMNB |
| 69 | #define MSGMNB 2048 /* max # of bytes in a queue */ |
| 70 | #endif |
| 71 | #ifndef MSGMNI |
| 72 | #define MSGMNI 40 |
| 73 | #endif |
| 74 | #ifndef MSGTQL |
| 75 | #define MSGTQL 40 |
| 76 | #endif |
| 77 | |
| 78 | /* |
| 79 | * Based on the configuration parameters described in an SVR2 (yes, two) |
| 80 | * config(1m) man page. |
| 81 | * |
| 82 | * Each message is broken up and stored in segments that are msgssz bytes |
| 83 | * long. For efficiency reasons, this should be a power of two. Also, |
| 84 | * it doesn't make sense if it is less than 8 or greater than about 256. |
| 85 | * Consequently, msginit in kern/sysv_msg.c checks that msgssz is a power of |
| 86 | * two between 8 and 1024 inclusive (and panic's if it isn't). |
| 87 | */ |
| 88 | struct msginfo msginfo = { |
| 89 | MSGMAX, /* max chars in a message */ |
| 90 | MSGMNI, /* # of message queue identifiers */ |
| 91 | MSGMNB, /* max chars in a queue */ |
| 92 | MSGTQL, /* max messages in system */ |
| 93 | MSGSSZ, /* size of a message segment */ |
| 94 | /* (must be small power of 2 greater than 4) */ |
| 95 | MSGSEG /* number of message segments */ |
| 96 | }; |
| 97 | |
| 98 | /* |
| 99 | * macros to convert between msqid_ds's and msqid's. |
| 100 | * (specific to this implementation) |
| 101 | */ |
| 102 | #define MSQID(ix,ds) ((ix) & 0xffff | (((ds).msg_perm.seq << 16) & 0xffff0000)) |
| 103 | #define MSQID_IX(id) ((id) & 0xffff) |
| 104 | #define MSQID_SEQ(id) (((id) >> 16) & 0xffff) |
| 105 | |
| 106 | /* |
| 107 | * The rest of this file is specific to this particular implementation. |
| 108 | */ |
| 109 | |
| 110 | struct msgmap { |
| 111 | short next; /* next segment in buffer */ |
| 112 | /* -1 -> available */ |
| 113 | /* 0..(MSGSEG-1) -> index of next segment */ |
| 114 | }; |
| 115 | |
| 116 | #define MSG_LOCKED 01000 /* Is this msqid_ds locked? */ |
| 117 | |
| 118 | static int nfree_msgmaps; /* # of free map entries */ |
| 119 | static short free_msgmaps; /* head of linked list of free map entries */ |
| 120 | static struct msg *free_msghdrs;/* list of free msg headers */ |
| 121 | static char *msgpool; /* MSGMAX byte long msg buffer pool */ |
| 122 | static struct msgmap *msgmaps; /* MSGSEG msgmap structures */ |
| 123 | static struct msg *msghdrs; /* MSGTQL msg headers */ |
| 124 | static struct msqid_ds *msqids; /* MSGMNI msqid_ds struct's */ |
| 125 | |
| 126 | static void |
| 127 | msginit(dummy) |
| 128 | void *dummy; |
| 129 | { |
| 130 | register int i; |
| 131 | |
| 132 | msginfo.msgmax = msginfo.msgseg * msginfo.msgssz; |
| 133 | msgpool = malloc(msginfo.msgmax, M_MSG, M_WAITOK); |
| 134 | if (msgpool == NULL) |
| 135 | panic("msgpool is NULL"); |
| 136 | msgmaps = malloc(sizeof(struct msgmap) * msginfo.msgseg, M_MSG, M_WAITOK); |
| 137 | if (msgmaps == NULL) |
| 138 | panic("msgmaps is NULL"); |
| 139 | msghdrs = malloc(sizeof(struct msg) * msginfo.msgtql, M_MSG, M_WAITOK); |
| 140 | if (msghdrs == NULL) |
| 141 | panic("msghdrs is NULL"); |
| 142 | msqids = malloc(sizeof(struct msqid_ds) * msginfo.msgmni, M_MSG, M_WAITOK); |
| 143 | if (msqids == NULL) |
| 144 | panic("msqids is NULL"); |
| 145 | |
| 146 | /* |
| 147 | * msginfo.msgssz should be a power of two for efficiency reasons. |
| 148 | * It is also pretty silly if msginfo.msgssz is less than 8 |
| 149 | * or greater than about 256 so ... |
| 150 | */ |
| 151 | |
| 152 | i = 8; |
| 153 | while (i < 1024 && i != msginfo.msgssz) |
| 154 | i <<= 1; |
| 155 | if (i != msginfo.msgssz) { |
| 156 | printf("msginfo.msgssz=%d (0x%x)\n", msginfo.msgssz, |
| 157 | msginfo.msgssz); |
| 158 | panic("msginfo.msgssz not a small power of 2"); |
| 159 | } |
| 160 | |
| 161 | if (msginfo.msgseg > 32767) { |
| 162 | printf("msginfo.msgseg=%d\n", msginfo.msgseg); |
| 163 | panic("msginfo.msgseg > 32767"); |
| 164 | } |
| 165 | |
| 166 | if (msgmaps == NULL) |
| 167 | panic("msgmaps is NULL"); |
| 168 | |
| 169 | for (i = 0; i < msginfo.msgseg; i++) { |
| 170 | if (i > 0) |
| 171 | msgmaps[i-1].next = i; |
| 172 | msgmaps[i].next = -1; /* implies entry is available */ |
| 173 | } |
| 174 | free_msgmaps = 0; |
| 175 | nfree_msgmaps = msginfo.msgseg; |
| 176 | |
| 177 | if (msghdrs == NULL) |
| 178 | panic("msghdrs is NULL"); |
| 179 | |
| 180 | for (i = 0; i < msginfo.msgtql; i++) { |
| 181 | msghdrs[i].msg_type = 0; |
| 182 | if (i > 0) |
| 183 | msghdrs[i-1].msg_next = &msghdrs[i]; |
| 184 | msghdrs[i].msg_next = NULL; |
| 185 | } |
| 186 | free_msghdrs = &msghdrs[0]; |
| 187 | |
| 188 | if (msqids == NULL) |
| 189 | panic("msqids is NULL"); |
| 190 | |
| 191 | for (i = 0; i < msginfo.msgmni; i++) { |
| 192 | msqids[i].msg_qbytes = 0; /* implies entry is available */ |
| 193 | msqids[i].msg_perm.seq = 0; /* reset to a known value */ |
| 194 | msqids[i].msg_perm.mode = 0; |
| 195 | } |
| 196 | } |
| 197 | SYSINIT(sysv_msg, SI_SUB_SYSV_MSG, SI_ORDER_FIRST, msginit, NULL) |
| 198 | |
| 199 | /* |
| 200 | * Entry point for all MSG calls |
| 201 | * |
| 202 | * msgsys_args(u_int which, int a2, ...) (VARARGS) |
| 203 | */ |
| 204 | int |
| 205 | msgsys(struct msgsys_args *uap) |
| 206 | { |
| 207 | struct proc *p = curproc; |
| 208 | |
| 209 | if (!jail_sysvipc_allowed && p->p_ucred->cr_prison != NULL) |
| 210 | return (ENOSYS); |
| 211 | |
| 212 | if (uap->which >= sizeof(msgcalls)/sizeof(msgcalls[0])) |
| 213 | return (EINVAL); |
| 214 | return ((*msgcalls[uap->which])(&uap->a2)); |
| 215 | } |
| 216 | |
| 217 | static void |
| 218 | msg_freehdr(struct msg *msghdr) |
| 219 | { |
| 220 | while (msghdr->msg_ts > 0) { |
| 221 | short next; |
| 222 | if (msghdr->msg_spot < 0 || msghdr->msg_spot >= msginfo.msgseg) |
| 223 | panic("msghdr->msg_spot out of range"); |
| 224 | next = msgmaps[msghdr->msg_spot].next; |
| 225 | msgmaps[msghdr->msg_spot].next = free_msgmaps; |
| 226 | free_msgmaps = msghdr->msg_spot; |
| 227 | nfree_msgmaps++; |
| 228 | msghdr->msg_spot = next; |
| 229 | if (msghdr->msg_ts >= msginfo.msgssz) |
| 230 | msghdr->msg_ts -= msginfo.msgssz; |
| 231 | else |
| 232 | msghdr->msg_ts = 0; |
| 233 | } |
| 234 | if (msghdr->msg_spot != -1) |
| 235 | panic("msghdr->msg_spot != -1"); |
| 236 | msghdr->msg_next = free_msghdrs; |
| 237 | free_msghdrs = msghdr; |
| 238 | } |
| 239 | |
| 240 | #ifndef _SYS_SYSPROTO_H_ |
| 241 | struct msgctl_args { |
| 242 | int msqid; |
| 243 | int cmd; |
| 244 | struct msqid_ds *buf; |
| 245 | }; |
| 246 | #endif |
| 247 | |
| 248 | int |
| 249 | msgctl(struct msgctl_args *uap) |
| 250 | { |
| 251 | struct thread *td = curthread; |
| 252 | struct proc *p = td->td_proc; |
| 253 | int msqid = uap->msqid; |
| 254 | int cmd = uap->cmd; |
| 255 | struct msqid_ds *user_msqptr = uap->buf; |
| 256 | int rval, eval; |
| 257 | struct msqid_ds msqbuf; |
| 258 | register struct msqid_ds *msqptr; |
| 259 | |
| 260 | #ifdef MSG_DEBUG_OK |
| 261 | printf("call to msgctl(%d, %d, 0x%x)\n", msqid, cmd, user_msqptr); |
| 262 | #endif |
| 263 | |
| 264 | if (!jail_sysvipc_allowed && p->p_ucred->cr_prison != NULL) |
| 265 | return (ENOSYS); |
| 266 | |
| 267 | msqid = IPCID_TO_IX(msqid); |
| 268 | |
| 269 | if (msqid < 0 || msqid >= msginfo.msgmni) { |
| 270 | #ifdef MSG_DEBUG_OK |
| 271 | printf("msqid (%d) out of range (0<=msqid<%d)\n", msqid, |
| 272 | msginfo.msgmni); |
| 273 | #endif |
| 274 | return(EINVAL); |
| 275 | } |
| 276 | |
| 277 | msqptr = &msqids[msqid]; |
| 278 | |
| 279 | if (msqptr->msg_qbytes == 0) { |
| 280 | #ifdef MSG_DEBUG_OK |
| 281 | printf("no such msqid\n"); |
| 282 | #endif |
| 283 | return(EINVAL); |
| 284 | } |
| 285 | if (msqptr->msg_perm.seq != IPCID_TO_SEQ(uap->msqid)) { |
| 286 | #ifdef MSG_DEBUG_OK |
| 287 | printf("wrong sequence number\n"); |
| 288 | #endif |
| 289 | return(EINVAL); |
| 290 | } |
| 291 | |
| 292 | eval = 0; |
| 293 | rval = 0; |
| 294 | |
| 295 | switch (cmd) { |
| 296 | |
| 297 | case IPC_RMID: |
| 298 | { |
| 299 | struct msg *msghdr; |
| 300 | if ((eval = ipcperm(p, &msqptr->msg_perm, IPC_M))) |
| 301 | return(eval); |
| 302 | /* Free the message headers */ |
| 303 | msghdr = msqptr->msg_first; |
| 304 | while (msghdr != NULL) { |
| 305 | struct msg *msghdr_tmp; |
| 306 | |
| 307 | /* Free the segments of each message */ |
| 308 | msqptr->msg_cbytes -= msghdr->msg_ts; |
| 309 | msqptr->msg_qnum--; |
| 310 | msghdr_tmp = msghdr; |
| 311 | msghdr = msghdr->msg_next; |
| 312 | msg_freehdr(msghdr_tmp); |
| 313 | } |
| 314 | |
| 315 | if (msqptr->msg_cbytes != 0) |
| 316 | panic("msg_cbytes is screwed up"); |
| 317 | if (msqptr->msg_qnum != 0) |
| 318 | panic("msg_qnum is screwed up"); |
| 319 | |
| 320 | msqptr->msg_qbytes = 0; /* Mark it as free */ |
| 321 | |
| 322 | wakeup((caddr_t)msqptr); |
| 323 | } |
| 324 | |
| 325 | break; |
| 326 | |
| 327 | case IPC_SET: |
| 328 | if ((eval = ipcperm(p, &msqptr->msg_perm, IPC_M))) |
| 329 | return(eval); |
| 330 | if ((eval = copyin(user_msqptr, &msqbuf, sizeof(msqbuf))) != 0) |
| 331 | return(eval); |
| 332 | if (msqbuf.msg_qbytes > msqptr->msg_qbytes) { |
| 333 | eval = suser(td); |
| 334 | if (eval) |
| 335 | return(eval); |
| 336 | } |
| 337 | if (msqbuf.msg_qbytes > msginfo.msgmnb) { |
| 338 | #ifdef MSG_DEBUG_OK |
| 339 | printf("can't increase msg_qbytes beyond %d (truncating)\n", |
| 340 | msginfo.msgmnb); |
| 341 | #endif |
| 342 | msqbuf.msg_qbytes = msginfo.msgmnb; /* silently restrict qbytes to system limit */ |
| 343 | } |
| 344 | if (msqbuf.msg_qbytes == 0) { |
| 345 | #ifdef MSG_DEBUG_OK |
| 346 | printf("can't reduce msg_qbytes to 0\n"); |
| 347 | #endif |
| 348 | return(EINVAL); /* non-standard errno! */ |
| 349 | } |
| 350 | msqptr->msg_perm.uid = msqbuf.msg_perm.uid; /* change the owner */ |
| 351 | msqptr->msg_perm.gid = msqbuf.msg_perm.gid; /* change the owner */ |
| 352 | msqptr->msg_perm.mode = (msqptr->msg_perm.mode & ~0777) | |
| 353 | (msqbuf.msg_perm.mode & 0777); |
| 354 | msqptr->msg_qbytes = msqbuf.msg_qbytes; |
| 355 | msqptr->msg_ctime = time_second; |
| 356 | break; |
| 357 | |
| 358 | case IPC_STAT: |
| 359 | if ((eval = ipcperm(p, &msqptr->msg_perm, IPC_R))) { |
| 360 | #ifdef MSG_DEBUG_OK |
| 361 | printf("requester doesn't have read access\n"); |
| 362 | #endif |
| 363 | return(eval); |
| 364 | } |
| 365 | eval = copyout((caddr_t)msqptr, user_msqptr, |
| 366 | sizeof(struct msqid_ds)); |
| 367 | break; |
| 368 | |
| 369 | default: |
| 370 | #ifdef MSG_DEBUG_OK |
| 371 | printf("invalid command %d\n", cmd); |
| 372 | #endif |
| 373 | return(EINVAL); |
| 374 | } |
| 375 | |
| 376 | if (eval == 0) |
| 377 | p->p_retval[0] = rval; |
| 378 | return(eval); |
| 379 | } |
| 380 | |
| 381 | #ifndef _SYS_SYSPROTO_H_ |
| 382 | struct msgget_args { |
| 383 | key_t key; |
| 384 | int msgflg; |
| 385 | }; |
| 386 | #endif |
| 387 | |
| 388 | int |
| 389 | msgget(struct msgget_args *uap) |
| 390 | { |
| 391 | struct proc *p = curproc; |
| 392 | int msqid, eval; |
| 393 | int key = uap->key; |
| 394 | int msgflg = uap->msgflg; |
| 395 | struct ucred *cred = p->p_ucred; |
| 396 | register struct msqid_ds *msqptr = NULL; |
| 397 | |
| 398 | #ifdef MSG_DEBUG_OK |
| 399 | printf("msgget(0x%x, 0%o)\n", key, msgflg); |
| 400 | #endif |
| 401 | |
| 402 | if (!jail_sysvipc_allowed && p->p_ucred->cr_prison != NULL) |
| 403 | return (ENOSYS); |
| 404 | |
| 405 | if (key != IPC_PRIVATE) { |
| 406 | for (msqid = 0; msqid < msginfo.msgmni; msqid++) { |
| 407 | msqptr = &msqids[msqid]; |
| 408 | if (msqptr->msg_qbytes != 0 && |
| 409 | msqptr->msg_perm.key == key) |
| 410 | break; |
| 411 | } |
| 412 | if (msqid < msginfo.msgmni) { |
| 413 | #ifdef MSG_DEBUG_OK |
| 414 | printf("found public key\n"); |
| 415 | #endif |
| 416 | if ((msgflg & IPC_CREAT) && (msgflg & IPC_EXCL)) { |
| 417 | #ifdef MSG_DEBUG_OK |
| 418 | printf("not exclusive\n"); |
| 419 | #endif |
| 420 | return(EEXIST); |
| 421 | } |
| 422 | if ((eval = ipcperm(p, &msqptr->msg_perm, msgflg & 0700 ))) { |
| 423 | #ifdef MSG_DEBUG_OK |
| 424 | printf("requester doesn't have 0%o access\n", |
| 425 | msgflg & 0700); |
| 426 | #endif |
| 427 | return(eval); |
| 428 | } |
| 429 | goto found; |
| 430 | } |
| 431 | } |
| 432 | |
| 433 | #ifdef MSG_DEBUG_OK |
| 434 | printf("need to allocate the msqid_ds\n"); |
| 435 | #endif |
| 436 | if (key == IPC_PRIVATE || (msgflg & IPC_CREAT)) { |
| 437 | for (msqid = 0; msqid < msginfo.msgmni; msqid++) { |
| 438 | /* |
| 439 | * Look for an unallocated and unlocked msqid_ds. |
| 440 | * msqid_ds's can be locked by msgsnd or msgrcv while |
| 441 | * they are copying the message in/out. We can't |
| 442 | * re-use the entry until they release it. |
| 443 | */ |
| 444 | msqptr = &msqids[msqid]; |
| 445 | if (msqptr->msg_qbytes == 0 && |
| 446 | (msqptr->msg_perm.mode & MSG_LOCKED) == 0) |
| 447 | break; |
| 448 | } |
| 449 | if (msqid == msginfo.msgmni) { |
| 450 | #ifdef MSG_DEBUG_OK |
| 451 | printf("no more msqid_ds's available\n"); |
| 452 | #endif |
| 453 | return(ENOSPC); |
| 454 | } |
| 455 | #ifdef MSG_DEBUG_OK |
| 456 | printf("msqid %d is available\n", msqid); |
| 457 | #endif |
| 458 | msqptr->msg_perm.key = key; |
| 459 | msqptr->msg_perm.cuid = cred->cr_uid; |
| 460 | msqptr->msg_perm.uid = cred->cr_uid; |
| 461 | msqptr->msg_perm.cgid = cred->cr_gid; |
| 462 | msqptr->msg_perm.gid = cred->cr_gid; |
| 463 | msqptr->msg_perm.mode = (msgflg & 0777); |
| 464 | /* Make sure that the returned msqid is unique */ |
| 465 | msqptr->msg_perm.seq = (msqptr->msg_perm.seq + 1) & 0x7fff; |
| 466 | msqptr->msg_first = NULL; |
| 467 | msqptr->msg_last = NULL; |
| 468 | msqptr->msg_cbytes = 0; |
| 469 | msqptr->msg_qnum = 0; |
| 470 | msqptr->msg_qbytes = msginfo.msgmnb; |
| 471 | msqptr->msg_lspid = 0; |
| 472 | msqptr->msg_lrpid = 0; |
| 473 | msqptr->msg_stime = 0; |
| 474 | msqptr->msg_rtime = 0; |
| 475 | msqptr->msg_ctime = time_second; |
| 476 | } else { |
| 477 | #ifdef MSG_DEBUG_OK |
| 478 | printf("didn't find it and wasn't asked to create it\n"); |
| 479 | #endif |
| 480 | return(ENOENT); |
| 481 | } |
| 482 | |
| 483 | found: |
| 484 | /* Construct the unique msqid */ |
| 485 | p->p_retval[0] = IXSEQ_TO_IPCID(msqid, msqptr->msg_perm); |
| 486 | return(0); |
| 487 | } |
| 488 | |
| 489 | #ifndef _SYS_SYSPROTO_H_ |
| 490 | struct msgsnd_args { |
| 491 | int msqid; |
| 492 | void *msgp; |
| 493 | size_t msgsz; |
| 494 | int msgflg; |
| 495 | }; |
| 496 | #endif |
| 497 | |
| 498 | int |
| 499 | msgsnd(struct msgsnd_args *uap) |
| 500 | { |
| 501 | struct proc *p = curproc; |
| 502 | int msqid = uap->msqid; |
| 503 | void *user_msgp = uap->msgp; |
| 504 | size_t msgsz = uap->msgsz; |
| 505 | int msgflg = uap->msgflg; |
| 506 | int segs_needed, eval; |
| 507 | register struct msqid_ds *msqptr; |
| 508 | register struct msg *msghdr; |
| 509 | short next; |
| 510 | |
| 511 | #ifdef MSG_DEBUG_OK |
| 512 | printf("call to msgsnd(%d, 0x%x, %d, %d)\n", msqid, user_msgp, msgsz, |
| 513 | msgflg); |
| 514 | #endif |
| 515 | |
| 516 | if (!jail_sysvipc_allowed && p->p_ucred->cr_prison != NULL) |
| 517 | return (ENOSYS); |
| 518 | |
| 519 | msqid = IPCID_TO_IX(msqid); |
| 520 | |
| 521 | if (msqid < 0 || msqid >= msginfo.msgmni) { |
| 522 | #ifdef MSG_DEBUG_OK |
| 523 | printf("msqid (%d) out of range (0<=msqid<%d)\n", msqid, |
| 524 | msginfo.msgmni); |
| 525 | #endif |
| 526 | return(EINVAL); |
| 527 | } |
| 528 | |
| 529 | msqptr = &msqids[msqid]; |
| 530 | if (msqptr->msg_qbytes == 0) { |
| 531 | #ifdef MSG_DEBUG_OK |
| 532 | printf("no such message queue id\n"); |
| 533 | #endif |
| 534 | return(EINVAL); |
| 535 | } |
| 536 | if (msqptr->msg_perm.seq != IPCID_TO_SEQ(uap->msqid)) { |
| 537 | #ifdef MSG_DEBUG_OK |
| 538 | printf("wrong sequence number\n"); |
| 539 | #endif |
| 540 | return(EINVAL); |
| 541 | } |
| 542 | |
| 543 | if ((eval = ipcperm(p, &msqptr->msg_perm, IPC_W))) { |
| 544 | #ifdef MSG_DEBUG_OK |
| 545 | printf("requester doesn't have write access\n"); |
| 546 | #endif |
| 547 | return(eval); |
| 548 | } |
| 549 | |
| 550 | segs_needed = (msgsz + msginfo.msgssz - 1) / msginfo.msgssz; |
| 551 | #ifdef MSG_DEBUG_OK |
| 552 | printf("msgsz=%d, msgssz=%d, segs_needed=%d\n", msgsz, msginfo.msgssz, |
| 553 | segs_needed); |
| 554 | #endif |
| 555 | for (;;) { |
| 556 | int need_more_resources = 0; |
| 557 | |
| 558 | /* |
| 559 | * check msgsz |
| 560 | * (inside this loop in case msg_qbytes changes while we sleep) |
| 561 | */ |
| 562 | |
| 563 | if (msgsz > msqptr->msg_qbytes) { |
| 564 | #ifdef MSG_DEBUG_OK |
| 565 | printf("msgsz > msqptr->msg_qbytes\n"); |
| 566 | #endif |
| 567 | return(EINVAL); |
| 568 | } |
| 569 | |
| 570 | if (msqptr->msg_perm.mode & MSG_LOCKED) { |
| 571 | #ifdef MSG_DEBUG_OK |
| 572 | printf("msqid is locked\n"); |
| 573 | #endif |
| 574 | need_more_resources = 1; |
| 575 | } |
| 576 | if (msgsz + msqptr->msg_cbytes > msqptr->msg_qbytes) { |
| 577 | #ifdef MSG_DEBUG_OK |
| 578 | printf("msgsz + msg_cbytes > msg_qbytes\n"); |
| 579 | #endif |
| 580 | need_more_resources = 1; |
| 581 | } |
| 582 | if (segs_needed > nfree_msgmaps) { |
| 583 | #ifdef MSG_DEBUG_OK |
| 584 | printf("segs_needed > nfree_msgmaps\n"); |
| 585 | #endif |
| 586 | need_more_resources = 1; |
| 587 | } |
| 588 | if (free_msghdrs == NULL) { |
| 589 | #ifdef MSG_DEBUG_OK |
| 590 | printf("no more msghdrs\n"); |
| 591 | #endif |
| 592 | need_more_resources = 1; |
| 593 | } |
| 594 | |
| 595 | if (need_more_resources) { |
| 596 | int we_own_it; |
| 597 | |
| 598 | if ((msgflg & IPC_NOWAIT) != 0) { |
| 599 | #ifdef MSG_DEBUG_OK |
| 600 | printf("need more resources but caller doesn't want to wait\n"); |
| 601 | #endif |
| 602 | return(EAGAIN); |
| 603 | } |
| 604 | |
| 605 | if ((msqptr->msg_perm.mode & MSG_LOCKED) != 0) { |
| 606 | #ifdef MSG_DEBUG_OK |
| 607 | printf("we don't own the msqid_ds\n"); |
| 608 | #endif |
| 609 | we_own_it = 0; |
| 610 | } else { |
| 611 | /* Force later arrivals to wait for our |
| 612 | request */ |
| 613 | #ifdef MSG_DEBUG_OK |
| 614 | printf("we own the msqid_ds\n"); |
| 615 | #endif |
| 616 | msqptr->msg_perm.mode |= MSG_LOCKED; |
| 617 | we_own_it = 1; |
| 618 | } |
| 619 | #ifdef MSG_DEBUG_OK |
| 620 | printf("goodnight\n"); |
| 621 | #endif |
| 622 | eval = tsleep((caddr_t)msqptr, (PZERO - 4) | PCATCH, |
| 623 | "msgwait", 0); |
| 624 | #ifdef MSG_DEBUG_OK |
| 625 | printf("good morning, eval=%d\n", eval); |
| 626 | #endif |
| 627 | if (we_own_it) |
| 628 | msqptr->msg_perm.mode &= ~MSG_LOCKED; |
| 629 | if (eval != 0) { |
| 630 | #ifdef MSG_DEBUG_OK |
| 631 | printf("msgsnd: interrupted system call\n"); |
| 632 | #endif |
| 633 | return(EINTR); |
| 634 | } |
| 635 | |
| 636 | /* |
| 637 | * Make sure that the msq queue still exists |
| 638 | */ |
| 639 | |
| 640 | if (msqptr->msg_qbytes == 0) { |
| 641 | #ifdef MSG_DEBUG_OK |
| 642 | printf("msqid deleted\n"); |
| 643 | #endif |
| 644 | return(EIDRM); |
| 645 | } |
| 646 | |
| 647 | } else { |
| 648 | #ifdef MSG_DEBUG_OK |
| 649 | printf("got all the resources that we need\n"); |
| 650 | #endif |
| 651 | break; |
| 652 | } |
| 653 | } |
| 654 | |
| 655 | /* |
| 656 | * We have the resources that we need. |
| 657 | * Make sure! |
| 658 | */ |
| 659 | |
| 660 | if (msqptr->msg_perm.mode & MSG_LOCKED) |
| 661 | panic("msg_perm.mode & MSG_LOCKED"); |
| 662 | if (segs_needed > nfree_msgmaps) |
| 663 | panic("segs_needed > nfree_msgmaps"); |
| 664 | if (msgsz + msqptr->msg_cbytes > msqptr->msg_qbytes) |
| 665 | panic("msgsz + msg_cbytes > msg_qbytes"); |
| 666 | if (free_msghdrs == NULL) |
| 667 | panic("no more msghdrs"); |
| 668 | |
| 669 | /* |
| 670 | * Re-lock the msqid_ds in case we page-fault when copying in the |
| 671 | * message |
| 672 | */ |
| 673 | |
| 674 | if ((msqptr->msg_perm.mode & MSG_LOCKED) != 0) |
| 675 | panic("msqid_ds is already locked"); |
| 676 | msqptr->msg_perm.mode |= MSG_LOCKED; |
| 677 | |
| 678 | /* |
| 679 | * Allocate a message header |
| 680 | */ |
| 681 | |
| 682 | msghdr = free_msghdrs; |
| 683 | free_msghdrs = msghdr->msg_next; |
| 684 | msghdr->msg_spot = -1; |
| 685 | msghdr->msg_ts = msgsz; |
| 686 | |
| 687 | /* |
| 688 | * Allocate space for the message |
| 689 | */ |
| 690 | |
| 691 | while (segs_needed > 0) { |
| 692 | if (nfree_msgmaps <= 0) |
| 693 | panic("not enough msgmaps"); |
| 694 | if (free_msgmaps == -1) |
| 695 | panic("nil free_msgmaps"); |
| 696 | next = free_msgmaps; |
| 697 | if (next <= -1) |
| 698 | panic("next too low #1"); |
| 699 | if (next >= msginfo.msgseg) |
| 700 | panic("next out of range #1"); |
| 701 | #ifdef MSG_DEBUG_OK |
| 702 | printf("allocating segment %d to message\n", next); |
| 703 | #endif |
| 704 | free_msgmaps = msgmaps[next].next; |
| 705 | nfree_msgmaps--; |
| 706 | msgmaps[next].next = msghdr->msg_spot; |
| 707 | msghdr->msg_spot = next; |
| 708 | segs_needed--; |
| 709 | } |
| 710 | |
| 711 | /* |
| 712 | * Copy in the message type |
| 713 | */ |
| 714 | |
| 715 | if ((eval = copyin(user_msgp, &msghdr->msg_type, |
| 716 | sizeof(msghdr->msg_type))) != 0) { |
| 717 | #ifdef MSG_DEBUG_OK |
| 718 | printf("error %d copying the message type\n", eval); |
| 719 | #endif |
| 720 | msg_freehdr(msghdr); |
| 721 | msqptr->msg_perm.mode &= ~MSG_LOCKED; |
| 722 | wakeup((caddr_t)msqptr); |
| 723 | return(eval); |
| 724 | } |
| 725 | user_msgp = (char *)user_msgp + sizeof(msghdr->msg_type); |
| 726 | |
| 727 | /* |
| 728 | * Validate the message type |
| 729 | */ |
| 730 | |
| 731 | if (msghdr->msg_type < 1) { |
| 732 | msg_freehdr(msghdr); |
| 733 | msqptr->msg_perm.mode &= ~MSG_LOCKED; |
| 734 | wakeup((caddr_t)msqptr); |
| 735 | #ifdef MSG_DEBUG_OK |
| 736 | printf("mtype (%d) < 1\n", msghdr->msg_type); |
| 737 | #endif |
| 738 | return(EINVAL); |
| 739 | } |
| 740 | |
| 741 | /* |
| 742 | * Copy in the message body |
| 743 | */ |
| 744 | |
| 745 | next = msghdr->msg_spot; |
| 746 | while (msgsz > 0) { |
| 747 | size_t tlen; |
| 748 | if (msgsz > msginfo.msgssz) |
| 749 | tlen = msginfo.msgssz; |
| 750 | else |
| 751 | tlen = msgsz; |
| 752 | if (next <= -1) |
| 753 | panic("next too low #2"); |
| 754 | if (next >= msginfo.msgseg) |
| 755 | panic("next out of range #2"); |
| 756 | if ((eval = copyin(user_msgp, &msgpool[next * msginfo.msgssz], |
| 757 | tlen)) != 0) { |
| 758 | #ifdef MSG_DEBUG_OK |
| 759 | printf("error %d copying in message segment\n", eval); |
| 760 | #endif |
| 761 | msg_freehdr(msghdr); |
| 762 | msqptr->msg_perm.mode &= ~MSG_LOCKED; |
| 763 | wakeup((caddr_t)msqptr); |
| 764 | return(eval); |
| 765 | } |
| 766 | msgsz -= tlen; |
| 767 | user_msgp = (char *)user_msgp + tlen; |
| 768 | next = msgmaps[next].next; |
| 769 | } |
| 770 | if (next != -1) |
| 771 | panic("didn't use all the msg segments"); |
| 772 | |
| 773 | /* |
| 774 | * We've got the message. Unlock the msqid_ds. |
| 775 | */ |
| 776 | |
| 777 | msqptr->msg_perm.mode &= ~MSG_LOCKED; |
| 778 | |
| 779 | /* |
| 780 | * Make sure that the msqid_ds is still allocated. |
| 781 | */ |
| 782 | |
| 783 | if (msqptr->msg_qbytes == 0) { |
| 784 | msg_freehdr(msghdr); |
| 785 | wakeup((caddr_t)msqptr); |
| 786 | return(EIDRM); |
| 787 | } |
| 788 | |
| 789 | /* |
| 790 | * Put the message into the queue |
| 791 | */ |
| 792 | |
| 793 | if (msqptr->msg_first == NULL) { |
| 794 | msqptr->msg_first = msghdr; |
| 795 | msqptr->msg_last = msghdr; |
| 796 | } else { |
| 797 | msqptr->msg_last->msg_next = msghdr; |
| 798 | msqptr->msg_last = msghdr; |
| 799 | } |
| 800 | msqptr->msg_last->msg_next = NULL; |
| 801 | |
| 802 | msqptr->msg_cbytes += msghdr->msg_ts; |
| 803 | msqptr->msg_qnum++; |
| 804 | msqptr->msg_lspid = p->p_pid; |
| 805 | msqptr->msg_stime = time_second; |
| 806 | |
| 807 | wakeup((caddr_t)msqptr); |
| 808 | p->p_retval[0] = 0; |
| 809 | return(0); |
| 810 | } |
| 811 | |
| 812 | #ifndef _SYS_SYSPROTO_H_ |
| 813 | struct msgrcv_args { |
| 814 | int msqid; |
| 815 | void *msgp; |
| 816 | size_t msgsz; |
| 817 | long msgtyp; |
| 818 | int msgflg; |
| 819 | }; |
| 820 | #endif |
| 821 | |
| 822 | int |
| 823 | msgrcv(struct msgrcv_args *uap) |
| 824 | { |
| 825 | struct proc *p = curproc; |
| 826 | int msqid = uap->msqid; |
| 827 | void *user_msgp = uap->msgp; |
| 828 | size_t msgsz = uap->msgsz; |
| 829 | long msgtyp = uap->msgtyp; |
| 830 | int msgflg = uap->msgflg; |
| 831 | size_t len; |
| 832 | register struct msqid_ds *msqptr; |
| 833 | register struct msg *msghdr; |
| 834 | int eval; |
| 835 | short next; |
| 836 | |
| 837 | #ifdef MSG_DEBUG_OK |
| 838 | printf("call to msgrcv(%d, 0x%x, %d, %ld, %d)\n", msqid, user_msgp, |
| 839 | msgsz, msgtyp, msgflg); |
| 840 | #endif |
| 841 | |
| 842 | if (!jail_sysvipc_allowed && p->p_ucred->cr_prison != NULL) |
| 843 | return (ENOSYS); |
| 844 | |
| 845 | msqid = IPCID_TO_IX(msqid); |
| 846 | |
| 847 | if (msqid < 0 || msqid >= msginfo.msgmni) { |
| 848 | #ifdef MSG_DEBUG_OK |
| 849 | printf("msqid (%d) out of range (0<=msqid<%d)\n", msqid, |
| 850 | msginfo.msgmni); |
| 851 | #endif |
| 852 | return(EINVAL); |
| 853 | } |
| 854 | |
| 855 | msqptr = &msqids[msqid]; |
| 856 | if (msqptr->msg_qbytes == 0) { |
| 857 | #ifdef MSG_DEBUG_OK |
| 858 | printf("no such message queue id\n"); |
| 859 | #endif |
| 860 | return(EINVAL); |
| 861 | } |
| 862 | if (msqptr->msg_perm.seq != IPCID_TO_SEQ(uap->msqid)) { |
| 863 | #ifdef MSG_DEBUG_OK |
| 864 | printf("wrong sequence number\n"); |
| 865 | #endif |
| 866 | return(EINVAL); |
| 867 | } |
| 868 | |
| 869 | if ((eval = ipcperm(p, &msqptr->msg_perm, IPC_R))) { |
| 870 | #ifdef MSG_DEBUG_OK |
| 871 | printf("requester doesn't have read access\n"); |
| 872 | #endif |
| 873 | return(eval); |
| 874 | } |
| 875 | |
| 876 | msghdr = NULL; |
| 877 | while (msghdr == NULL) { |
| 878 | if (msgtyp == 0) { |
| 879 | msghdr = msqptr->msg_first; |
| 880 | if (msghdr != NULL) { |
| 881 | if (msgsz < msghdr->msg_ts && |
| 882 | (msgflg & MSG_NOERROR) == 0) { |
| 883 | #ifdef MSG_DEBUG_OK |
| 884 | printf("first message on the queue is too big (want %d, got %d)\n", |
| 885 | msgsz, msghdr->msg_ts); |
| 886 | #endif |
| 887 | return(E2BIG); |
| 888 | } |
| 889 | if (msqptr->msg_first == msqptr->msg_last) { |
| 890 | msqptr->msg_first = NULL; |
| 891 | msqptr->msg_last = NULL; |
| 892 | } else { |
| 893 | msqptr->msg_first = msghdr->msg_next; |
| 894 | if (msqptr->msg_first == NULL) |
| 895 | panic("msg_first/last screwed up #1"); |
| 896 | } |
| 897 | } |
| 898 | } else { |
| 899 | struct msg *previous; |
| 900 | struct msg **prev; |
| 901 | |
| 902 | previous = NULL; |
| 903 | prev = &(msqptr->msg_first); |
| 904 | while ((msghdr = *prev) != NULL) { |
| 905 | /* |
| 906 | * Is this message's type an exact match or is |
| 907 | * this message's type less than or equal to |
| 908 | * the absolute value of a negative msgtyp? |
| 909 | * Note that the second half of this test can |
| 910 | * NEVER be true if msgtyp is positive since |
| 911 | * msg_type is always positive! |
| 912 | */ |
| 913 | |
| 914 | if (msgtyp == msghdr->msg_type || |
| 915 | msghdr->msg_type <= -msgtyp) { |
| 916 | #ifdef MSG_DEBUG_OK |
| 917 | printf("found message type %d, requested %d\n", |
| 918 | msghdr->msg_type, msgtyp); |
| 919 | #endif |
| 920 | if (msgsz < msghdr->msg_ts && |
| 921 | (msgflg & MSG_NOERROR) == 0) { |
| 922 | #ifdef MSG_DEBUG_OK |
| 923 | printf("requested message on the queue is too big (want %d, got %d)\n", |
| 924 | msgsz, msghdr->msg_ts); |
| 925 | #endif |
| 926 | return(E2BIG); |
| 927 | } |
| 928 | *prev = msghdr->msg_next; |
| 929 | if (msghdr == msqptr->msg_last) { |
| 930 | if (previous == NULL) { |
| 931 | if (prev != |
| 932 | &msqptr->msg_first) |
| 933 | panic("msg_first/last screwed up #2"); |
| 934 | msqptr->msg_first = |
| 935 | NULL; |
| 936 | msqptr->msg_last = |
| 937 | NULL; |
| 938 | } else { |
| 939 | if (prev == |
| 940 | &msqptr->msg_first) |
| 941 | panic("msg_first/last screwed up #3"); |
| 942 | msqptr->msg_last = |
| 943 | previous; |
| 944 | } |
| 945 | } |
| 946 | break; |
| 947 | } |
| 948 | previous = msghdr; |
| 949 | prev = &(msghdr->msg_next); |
| 950 | } |
| 951 | } |
| 952 | |
| 953 | /* |
| 954 | * We've either extracted the msghdr for the appropriate |
| 955 | * message or there isn't one. |
| 956 | * If there is one then bail out of this loop. |
| 957 | */ |
| 958 | |
| 959 | if (msghdr != NULL) |
| 960 | break; |
| 961 | |
| 962 | /* |
| 963 | * Hmph! No message found. Does the user want to wait? |
| 964 | */ |
| 965 | |
| 966 | if ((msgflg & IPC_NOWAIT) != 0) { |
| 967 | #ifdef MSG_DEBUG_OK |
| 968 | printf("no appropriate message found (msgtyp=%d)\n", |
| 969 | msgtyp); |
| 970 | #endif |
| 971 | /* The SVID says to return ENOMSG. */ |
| 972 | #ifdef ENOMSG |
| 973 | return(ENOMSG); |
| 974 | #else |
| 975 | /* Unfortunately, BSD doesn't define that code yet! */ |
| 976 | return(EAGAIN); |
| 977 | #endif |
| 978 | } |
| 979 | |
| 980 | /* |
| 981 | * Wait for something to happen |
| 982 | */ |
| 983 | |
| 984 | #ifdef MSG_DEBUG_OK |
| 985 | printf("msgrcv: goodnight\n"); |
| 986 | #endif |
| 987 | eval = tsleep((caddr_t)msqptr, (PZERO - 4) | PCATCH, "msgwait", |
| 988 | 0); |
| 989 | #ifdef MSG_DEBUG_OK |
| 990 | printf("msgrcv: good morning (eval=%d)\n", eval); |
| 991 | #endif |
| 992 | |
| 993 | if (eval != 0) { |
| 994 | #ifdef MSG_DEBUG_OK |
| 995 | printf("msgsnd: interrupted system call\n"); |
| 996 | #endif |
| 997 | return(EINTR); |
| 998 | } |
| 999 | |
| 1000 | /* |
| 1001 | * Make sure that the msq queue still exists |
| 1002 | */ |
| 1003 | |
| 1004 | if (msqptr->msg_qbytes == 0 || |
| 1005 | msqptr->msg_perm.seq != IPCID_TO_SEQ(uap->msqid)) { |
| 1006 | #ifdef MSG_DEBUG_OK |
| 1007 | printf("msqid deleted\n"); |
| 1008 | #endif |
| 1009 | return(EIDRM); |
| 1010 | } |
| 1011 | } |
| 1012 | |
| 1013 | /* |
| 1014 | * Return the message to the user. |
| 1015 | * |
| 1016 | * First, do the bookkeeping (before we risk being interrupted). |
| 1017 | */ |
| 1018 | |
| 1019 | msqptr->msg_cbytes -= msghdr->msg_ts; |
| 1020 | msqptr->msg_qnum--; |
| 1021 | msqptr->msg_lrpid = p->p_pid; |
| 1022 | msqptr->msg_rtime = time_second; |
| 1023 | |
| 1024 | /* |
| 1025 | * Make msgsz the actual amount that we'll be returning. |
| 1026 | * Note that this effectively truncates the message if it is too long |
| 1027 | * (since msgsz is never increased). |
| 1028 | */ |
| 1029 | |
| 1030 | #ifdef MSG_DEBUG_OK |
| 1031 | printf("found a message, msgsz=%d, msg_ts=%d\n", msgsz, |
| 1032 | msghdr->msg_ts); |
| 1033 | #endif |
| 1034 | if (msgsz > msghdr->msg_ts) |
| 1035 | msgsz = msghdr->msg_ts; |
| 1036 | |
| 1037 | /* |
| 1038 | * Return the type to the user. |
| 1039 | */ |
| 1040 | |
| 1041 | eval = copyout((caddr_t)&(msghdr->msg_type), user_msgp, |
| 1042 | sizeof(msghdr->msg_type)); |
| 1043 | if (eval != 0) { |
| 1044 | #ifdef MSG_DEBUG_OK |
| 1045 | printf("error (%d) copying out message type\n", eval); |
| 1046 | #endif |
| 1047 | msg_freehdr(msghdr); |
| 1048 | wakeup((caddr_t)msqptr); |
| 1049 | return(eval); |
| 1050 | } |
| 1051 | user_msgp = (char *)user_msgp + sizeof(msghdr->msg_type); |
| 1052 | |
| 1053 | /* |
| 1054 | * Return the segments to the user |
| 1055 | */ |
| 1056 | |
| 1057 | next = msghdr->msg_spot; |
| 1058 | for (len = 0; len < msgsz; len += msginfo.msgssz) { |
| 1059 | size_t tlen; |
| 1060 | |
| 1061 | if (msgsz - len > msginfo.msgssz) |
| 1062 | tlen = msginfo.msgssz; |
| 1063 | else |
| 1064 | tlen = msgsz - len; |
| 1065 | if (next <= -1) |
| 1066 | panic("next too low #3"); |
| 1067 | if (next >= msginfo.msgseg) |
| 1068 | panic("next out of range #3"); |
| 1069 | eval = copyout((caddr_t)&msgpool[next * msginfo.msgssz], |
| 1070 | user_msgp, tlen); |
| 1071 | if (eval != 0) { |
| 1072 | #ifdef MSG_DEBUG_OK |
| 1073 | printf("error (%d) copying out message segment\n", |
| 1074 | eval); |
| 1075 | #endif |
| 1076 | msg_freehdr(msghdr); |
| 1077 | wakeup((caddr_t)msqptr); |
| 1078 | return(eval); |
| 1079 | } |
| 1080 | user_msgp = (char *)user_msgp + tlen; |
| 1081 | next = msgmaps[next].next; |
| 1082 | } |
| 1083 | |
| 1084 | /* |
| 1085 | * Done, return the actual number of bytes copied out. |
| 1086 | */ |
| 1087 | |
| 1088 | msg_freehdr(msghdr); |
| 1089 | wakeup((caddr_t)msqptr); |
| 1090 | p->p_retval[0] = msgsz; |
| 1091 | return(0); |
| 1092 | } |
| 1093 | |
| 1094 | static int |
| 1095 | sysctl_msqids(SYSCTL_HANDLER_ARGS) |
| 1096 | { |
| 1097 | |
| 1098 | return (SYSCTL_OUT(req, msqids, |
| 1099 | sizeof(struct msqid_ds) * msginfo.msgmni)); |
| 1100 | } |
| 1101 | |
| 1102 | TUNABLE_INT("kern.ipc.msgseg", &msginfo.msgseg); |
| 1103 | TUNABLE_INT("kern.ipc.msgssz", &msginfo.msgssz); |
| 1104 | TUNABLE_INT("kern.ipc.msgmni", &msginfo.msgmni); |
| 1105 | |
| 1106 | SYSCTL_DECL(_kern_ipc); |
| 1107 | SYSCTL_INT(_kern_ipc, OID_AUTO, msgmax, CTLFLAG_RD, &msginfo.msgmax, 0, ""); |
| 1108 | SYSCTL_INT(_kern_ipc, OID_AUTO, msgmni, CTLFLAG_RD, &msginfo.msgmni, 0, ""); |
| 1109 | SYSCTL_INT(_kern_ipc, OID_AUTO, msgmnb, CTLFLAG_RD, &msginfo.msgmnb, 0, ""); |
| 1110 | SYSCTL_INT(_kern_ipc, OID_AUTO, msgtql, CTLFLAG_RD, &msginfo.msgtql, 0, ""); |
| 1111 | SYSCTL_INT(_kern_ipc, OID_AUTO, msgssz, CTLFLAG_RD, &msginfo.msgssz, 0, ""); |
| 1112 | SYSCTL_INT(_kern_ipc, OID_AUTO, msgseg, CTLFLAG_RD, &msginfo.msgseg, 0, ""); |
| 1113 | SYSCTL_PROC(_kern_ipc, OID_AUTO, msqids, CTLFLAG_RD, |
| 1114 | NULL, 0, sysctl_msqids, "", "Message queue IDs"); |