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6f843dc9 KM |
1 | /* |
2 | * Copyright (c) 1988 University of Utah. | |
7a6e4544 KB |
3 | * Copyright (c) 1990, 1993 |
4 | * The Regents of the University of California. All rights reserved. | |
6f843dc9 KM |
5 | * |
6 | * This code is derived from software contributed to Berkeley by | |
7 | * the Systems Programming Group of the University of Utah Computer | |
8 | * Science Department. Originally from University of Wisconsin. | |
9 | * | |
10 | * %sccs.include.redist.c% | |
11 | * | |
3cf1b235 | 12 | * from: Utah $Hdr: uipc_shm.c 1.11 92/04/23$ |
6f843dc9 | 13 | * |
2ac345ab | 14 | * @(#)sysv_shm.c 8.2 (Berkeley) %G% |
6f843dc9 KM |
15 | */ |
16 | ||
17 | /* | |
18 | * System V shared memory routines. | |
e4f7cdf5 MK |
19 | * TEMPORARY, until mmap is in place; |
20 | * needed now for HP-UX compatibility and X server (yech!). | |
6f843dc9 KM |
21 | */ |
22 | ||
23 | #ifdef SYSVSHM | |
24 | ||
38a01dbe KB |
25 | #include <sys/param.h> |
26 | #include <sys/systm.h> | |
27 | #include <sys/kernel.h> | |
28 | #include <sys/proc.h> | |
29 | #include <sys/shm.h> | |
30 | #include <sys/malloc.h> | |
31 | #include <sys/mman.h> | |
2ac345ab | 32 | #include <sys/stat.h> |
38a01dbe KB |
33 | |
34 | #include <vm/vm.h> | |
35 | #include <vm/vm_kern.h> | |
36 | #include <vm/vm_inherit.h> | |
37 | #include <vm/vm_pager.h> | |
6f843dc9 | 38 | |
6f843dc9 KM |
39 | int shmat(), shmctl(), shmdt(), shmget(); |
40 | int (*shmcalls[])() = { shmat, shmctl, shmdt, shmget }; | |
41 | int shmtot = 0; | |
42 | ||
9db58063 KM |
43 | /* |
44 | * Per process internal structure for managing segments. | |
45 | * Each process using shm will have an array of ``shmseg'' of these. | |
46 | */ | |
47 | struct shmdesc { | |
48 | vm_offset_t shmd_uva; | |
49 | int shmd_id; | |
50 | }; | |
51 | ||
52 | /* | |
53 | * Per segment internal structure (shm_handle). | |
54 | */ | |
55 | struct shmhandle { | |
56 | vm_offset_t shmh_kva; | |
57 | caddr_t shmh_id; | |
58 | }; | |
59 | ||
60 | vm_map_t shm_map; /* address space for shared memory segments */ | |
6f843dc9 KM |
61 | |
62 | shminit() | |
63 | { | |
64 | register int i; | |
9db58063 | 65 | vm_offset_t whocares1, whocares2; |
6f843dc9 | 66 | |
9db58063 KM |
67 | shm_map = kmem_suballoc(kernel_map, &whocares1, &whocares2, |
68 | shminfo.shmall * NBPG, FALSE); | |
6f843dc9 KM |
69 | if (shminfo.shmmni > SHMMMNI) |
70 | shminfo.shmmni = SHMMMNI; | |
71 | for (i = 0; i < shminfo.shmmni; i++) { | |
72 | shmsegs[i].shm_perm.mode = 0; | |
73 | shmsegs[i].shm_perm.seq = 0; | |
74 | } | |
75 | } | |
76 | ||
161c14a2 KM |
77 | /* |
78 | * Entry point for all SHM calls | |
79 | */ | |
afc12c69 CT |
80 | struct shmsys_args { |
81 | u_int which; | |
82 | }; | |
161c14a2 KM |
83 | shmsys(p, uap, retval) |
84 | struct proc *p; | |
afc12c69 | 85 | struct shmsys_args *uap; |
161c14a2 KM |
86 | int *retval; |
87 | { | |
6f843dc9 | 88 | |
161c14a2 | 89 | if (uap->which >= sizeof(shmcalls)/sizeof(shmcalls[0])) |
d9c2f47f MK |
90 | return (EINVAL); |
91 | return ((*shmcalls[uap->which])(p, &uap[1], retval)); | |
6f843dc9 KM |
92 | } |
93 | ||
161c14a2 KM |
94 | /* |
95 | * Get a shared memory segment | |
96 | */ | |
afc12c69 CT |
97 | struct shmget_args { |
98 | key_t key; | |
99 | int size; | |
100 | int shmflg; | |
101 | }; | |
161c14a2 KM |
102 | shmget(p, uap, retval) |
103 | struct proc *p; | |
afc12c69 | 104 | register struct shmget_args *uap; |
161c14a2 KM |
105 | int *retval; |
106 | { | |
6f843dc9 | 107 | register struct shmid_ds *shp; |
8429d022 | 108 | register struct ucred *cred = p->p_ucred; |
6f843dc9 | 109 | register int i; |
161c14a2 | 110 | int error, size, rval = 0; |
9db58063 | 111 | register struct shmhandle *shmh; |
6f843dc9 KM |
112 | |
113 | /* look up the specified shm_id */ | |
114 | if (uap->key != IPC_PRIVATE) { | |
115 | for (i = 0; i < shminfo.shmmni; i++) | |
116 | if ((shmsegs[i].shm_perm.mode & SHM_ALLOC) && | |
117 | shmsegs[i].shm_perm.key == uap->key) { | |
118 | rval = i; | |
119 | break; | |
120 | } | |
121 | } else | |
122 | i = shminfo.shmmni; | |
123 | ||
124 | /* create a new shared segment if necessary */ | |
125 | if (i == shminfo.shmmni) { | |
161c14a2 KM |
126 | if ((uap->shmflg & IPC_CREAT) == 0) |
127 | return (ENOENT); | |
128 | if (uap->size < shminfo.shmmin || uap->size > shminfo.shmmax) | |
129 | return (EINVAL); | |
6f843dc9 KM |
130 | for (i = 0; i < shminfo.shmmni; i++) |
131 | if ((shmsegs[i].shm_perm.mode & SHM_ALLOC) == 0) { | |
132 | rval = i; | |
133 | break; | |
134 | } | |
161c14a2 KM |
135 | if (i == shminfo.shmmni) |
136 | return (ENOSPC); | |
6f843dc9 | 137 | size = clrnd(btoc(uap->size)); |
161c14a2 KM |
138 | if (shmtot + size > shminfo.shmall) |
139 | return (ENOMEM); | |
6f843dc9 KM |
140 | shp = &shmsegs[rval]; |
141 | /* | |
142 | * We need to do a couple of things to ensure consistency | |
143 | * in case we sleep in malloc(). We mark segment as | |
144 | * allocated so that other shmgets() will not allocate it. | |
145 | * We mark it as "destroyed" to insure that shmvalid() is | |
146 | * false making most operations fail (XXX). We set the key, | |
147 | * so that other shmget()s will fail. | |
148 | */ | |
149 | shp->shm_perm.mode = SHM_ALLOC | SHM_DEST; | |
150 | shp->shm_perm.key = uap->key; | |
9db58063 KM |
151 | shmh = (struct shmhandle *) |
152 | malloc(sizeof(struct shmhandle), M_SHM, M_WAITOK); | |
153 | shmh->shmh_kva = 0; | |
154 | shmh->shmh_id = (caddr_t)(0xc0000000|rval); /* XXX */ | |
155 | error = vm_mmap(shm_map, &shmh->shmh_kva, ctob(size), | |
79f39708 MH |
156 | VM_PROT_ALL, VM_PROT_ALL, |
157 | MAP_ANON, shmh->shmh_id, 0); | |
9db58063 KM |
158 | if (error) { |
159 | free((caddr_t)shmh, M_SHM); | |
6f843dc9 | 160 | shp->shm_perm.mode = 0; |
9db58063 | 161 | return(ENOMEM); |
6f843dc9 | 162 | } |
9db58063 | 163 | shp->shm_handle = (void *) shmh; |
6f843dc9 | 164 | shmtot += size; |
161c14a2 KM |
165 | shp->shm_perm.cuid = shp->shm_perm.uid = cred->cr_uid; |
166 | shp->shm_perm.cgid = shp->shm_perm.gid = cred->cr_gid; | |
2ac345ab | 167 | shp->shm_perm.mode = SHM_ALLOC | (uap->shmflg & ACCESSPERMS); |
6f843dc9 | 168 | shp->shm_segsz = uap->size; |
c9714ae3 | 169 | shp->shm_cpid = p->p_pid; |
6f843dc9 KM |
170 | shp->shm_lpid = shp->shm_nattch = 0; |
171 | shp->shm_atime = shp->shm_dtime = 0; | |
172 | shp->shm_ctime = time.tv_sec; | |
173 | } else { | |
174 | shp = &shmsegs[rval]; | |
175 | /* XXX: probably not the right thing to do */ | |
161c14a2 KM |
176 | if (shp->shm_perm.mode & SHM_DEST) |
177 | return (EBUSY); | |
2ac345ab KM |
178 | if (error = ipcaccess(&shp->shm_perm, uap->shmflg & ACCESSPERMS, |
179 | cred)) | |
161c14a2 KM |
180 | return (error); |
181 | if (uap->size && uap->size > shp->shm_segsz) | |
182 | return (EINVAL); | |
183 | if ((uap->shmflg&IPC_CREAT) && (uap->shmflg&IPC_EXCL)) | |
184 | return (EEXIST); | |
6f843dc9 | 185 | } |
161c14a2 | 186 | *retval = shp->shm_perm.seq * SHMMMNI + rval; |
015c074c | 187 | return (0); |
6f843dc9 KM |
188 | } |
189 | ||
161c14a2 KM |
190 | /* |
191 | * Shared memory control | |
192 | */ | |
afc12c69 CT |
193 | struct shmctl_args { |
194 | int shmid; | |
195 | int cmd; | |
196 | caddr_t buf; | |
197 | }; | |
161c14a2 KM |
198 | /* ARGSUSED */ |
199 | shmctl(p, uap, retval) | |
200 | struct proc *p; | |
afc12c69 | 201 | register struct shmctl_args *uap; |
161c14a2 KM |
202 | int *retval; |
203 | { | |
6f843dc9 | 204 | register struct shmid_ds *shp; |
8429d022 | 205 | register struct ucred *cred = p->p_ucred; |
6f843dc9 | 206 | struct shmid_ds sbuf; |
161c14a2 | 207 | int error; |
6f843dc9 | 208 | |
161c14a2 KM |
209 | if (error = shmvalid(uap->shmid)) |
210 | return (error); | |
6f843dc9 KM |
211 | shp = &shmsegs[uap->shmid % SHMMMNI]; |
212 | switch (uap->cmd) { | |
213 | case IPC_STAT: | |
015c074c | 214 | if (error = ipcaccess(&shp->shm_perm, IPC_R, cred)) |
161c14a2 KM |
215 | return (error); |
216 | return (copyout((caddr_t)shp, uap->buf, sizeof(*shp))); | |
6f843dc9 KM |
217 | |
218 | case IPC_SET: | |
161c14a2 KM |
219 | if (cred->cr_uid && cred->cr_uid != shp->shm_perm.uid && |
220 | cred->cr_uid != shp->shm_perm.cuid) | |
221 | return (EPERM); | |
222 | if (error = copyin(uap->buf, (caddr_t)&sbuf, sizeof sbuf)) | |
223 | return (error); | |
224 | shp->shm_perm.uid = sbuf.shm_perm.uid; | |
225 | shp->shm_perm.gid = sbuf.shm_perm.gid; | |
2ac345ab KM |
226 | shp->shm_perm.mode = (shp->shm_perm.mode & ~ACCESSPERMS) |
227 | | (sbuf.shm_perm.mode & ACCESSPERMS); | |
161c14a2 | 228 | shp->shm_ctime = time.tv_sec; |
6f843dc9 KM |
229 | break; |
230 | ||
231 | case IPC_RMID: | |
161c14a2 KM |
232 | if (cred->cr_uid && cred->cr_uid != shp->shm_perm.uid && |
233 | cred->cr_uid != shp->shm_perm.cuid) | |
234 | return (EPERM); | |
6f843dc9 KM |
235 | /* set ctime? */ |
236 | shp->shm_perm.key = IPC_PRIVATE; | |
237 | shp->shm_perm.mode |= SHM_DEST; | |
238 | if (shp->shm_nattch <= 0) | |
239 | shmfree(shp); | |
240 | break; | |
241 | ||
6f843dc9 | 242 | default: |
161c14a2 | 243 | return (EINVAL); |
6f843dc9 | 244 | } |
161c14a2 | 245 | return (0); |
6f843dc9 KM |
246 | } |
247 | ||
161c14a2 KM |
248 | /* |
249 | * Attach to shared memory segment. | |
250 | */ | |
afc12c69 CT |
251 | struct shmat_args { |
252 | int shmid; | |
253 | caddr_t shmaddr; | |
254 | int shmflg; | |
255 | }; | |
161c14a2 KM |
256 | shmat(p, uap, retval) |
257 | struct proc *p; | |
afc12c69 | 258 | register struct shmat_args *uap; |
161c14a2 KM |
259 | int *retval; |
260 | { | |
6f843dc9 KM |
261 | register struct shmid_ds *shp; |
262 | register int size; | |
6f843dc9 | 263 | caddr_t uva; |
9db58063 KM |
264 | int error; |
265 | int flags; | |
266 | vm_prot_t prot; | |
267 | struct shmdesc *shmd; | |
6f843dc9 | 268 | |
9db58063 KM |
269 | /* |
270 | * Allocate descriptors now (before validity check) | |
271 | * in case malloc() blocks. | |
272 | */ | |
8429d022 | 273 | shmd = (struct shmdesc *)p->p_vmspace->vm_shm; |
9db58063 KM |
274 | size = shminfo.shmseg * sizeof(struct shmdesc); |
275 | if (shmd == NULL) { | |
276 | shmd = (struct shmdesc *)malloc(size, M_SHM, M_WAITOK); | |
277 | bzero((caddr_t)shmd, size); | |
8429d022 | 278 | p->p_vmspace->vm_shm = (caddr_t)shmd; |
9db58063 | 279 | } |
161c14a2 KM |
280 | if (error = shmvalid(uap->shmid)) |
281 | return (error); | |
6f843dc9 KM |
282 | shp = &shmsegs[uap->shmid % SHMMMNI]; |
283 | if (shp->shm_handle == NULL) | |
96ea38ce | 284 | panic("shmat NULL handle"); |
015c074c | 285 | if (error = ipcaccess(&shp->shm_perm, |
8429d022 | 286 | (uap->shmflg&SHM_RDONLY) ? IPC_R : IPC_R|IPC_W, p->p_ucred)) |
161c14a2 | 287 | return (error); |
6f843dc9 KM |
288 | uva = uap->shmaddr; |
289 | if (uva && ((int)uva & (SHMLBA-1))) { | |
290 | if (uap->shmflg & SHM_RND) | |
291 | uva = (caddr_t) ((int)uva & ~(SHMLBA-1)); | |
161c14a2 KM |
292 | else |
293 | return (EINVAL); | |
6f843dc9 KM |
294 | } |
295 | /* | |
296 | * Make sure user doesn't use more than their fair share | |
297 | */ | |
9db58063 KM |
298 | for (size = 0; size < shminfo.shmseg; size++) { |
299 | if (shmd->shmd_uva == 0) | |
300 | break; | |
301 | shmd++; | |
302 | } | |
161c14a2 KM |
303 | if (size >= shminfo.shmseg) |
304 | return (EMFILE); | |
6f843dc9 | 305 | size = ctob(clrnd(btoc(shp->shm_segsz))); |
9db58063 KM |
306 | prot = VM_PROT_READ; |
307 | if ((uap->shmflg & SHM_RDONLY) == 0) | |
308 | prot |= VM_PROT_WRITE; | |
309 | flags = MAP_ANON|MAP_SHARED; | |
310 | if (uva) | |
311 | flags |= MAP_FIXED; | |
312 | else | |
313 | uva = (caddr_t)0x1000000; /* XXX */ | |
451df175 | 314 | error = vm_mmap(&p->p_vmspace->vm_map, (vm_offset_t *)&uva, |
79f39708 MH |
315 | (vm_size_t)size, prot, VM_PROT_ALL, flags, |
316 | ((struct shmhandle *)shp->shm_handle)->shmh_id, 0); | |
161c14a2 | 317 | if (error) |
9db58063 KM |
318 | return(error); |
319 | shmd->shmd_uva = (vm_offset_t)uva; | |
320 | shmd->shmd_id = uap->shmid; | |
6f843dc9 KM |
321 | /* |
322 | * Fill in the remaining fields | |
323 | */ | |
c9714ae3 | 324 | shp->shm_lpid = p->p_pid; |
6f843dc9 KM |
325 | shp->shm_atime = time.tv_sec; |
326 | shp->shm_nattch++; | |
161c14a2 | 327 | *retval = (int) uva; |
015c074c | 328 | return (0); |
6f843dc9 KM |
329 | } |
330 | ||
161c14a2 KM |
331 | /* |
332 | * Detach from shared memory segment. | |
333 | */ | |
afc12c69 CT |
334 | struct shmdt_args { |
335 | caddr_t shmaddr; | |
336 | }; | |
161c14a2 KM |
337 | /* ARGSUSED */ |
338 | shmdt(p, uap, retval) | |
339 | struct proc *p; | |
afc12c69 | 340 | struct shmdt_args *uap; |
161c14a2 KM |
341 | int *retval; |
342 | { | |
9db58063 KM |
343 | register struct shmdesc *shmd; |
344 | register int i; | |
6f843dc9 | 345 | |
8429d022 | 346 | shmd = (struct shmdesc *)p->p_vmspace->vm_shm; |
9db58063 KM |
347 | for (i = 0; i < shminfo.shmseg; i++, shmd++) |
348 | if (shmd->shmd_uva && | |
349 | shmd->shmd_uva == (vm_offset_t)uap->shmaddr) | |
6f843dc9 | 350 | break; |
9db58063 KM |
351 | if (i == shminfo.shmseg) |
352 | return(EINVAL); | |
353 | shmufree(p, shmd); | |
354 | shmsegs[shmd->shmd_id % SHMMMNI].shm_lpid = p->p_pid; | |
6f843dc9 KM |
355 | } |
356 | ||
8429d022 MK |
357 | shmfork(p1, p2, isvfork) |
358 | struct proc *p1, *p2; | |
9db58063 | 359 | int isvfork; |
6f843dc9 | 360 | { |
9db58063 KM |
361 | register struct shmdesc *shmd; |
362 | register int size; | |
6f843dc9 | 363 | |
9db58063 KM |
364 | /* |
365 | * Copy parents descriptive information | |
366 | */ | |
367 | size = shminfo.shmseg * sizeof(struct shmdesc); | |
368 | shmd = (struct shmdesc *)malloc(size, M_SHM, M_WAITOK); | |
8429d022 MK |
369 | bcopy((caddr_t)p1->p_vmspace->vm_shm, (caddr_t)shmd, size); |
370 | p2->p_vmspace->vm_shm = (caddr_t)shmd; | |
9db58063 KM |
371 | /* |
372 | * Increment reference counts | |
373 | */ | |
374 | for (size = 0; size < shminfo.shmseg; size++, shmd++) | |
375 | if (shmd->shmd_uva) | |
376 | shmsegs[shmd->shmd_id % SHMMMNI].shm_nattch++; | |
6f843dc9 KM |
377 | } |
378 | ||
9db58063 KM |
379 | shmexit(p) |
380 | struct proc *p; | |
6f843dc9 | 381 | { |
9db58063 KM |
382 | register struct shmdesc *shmd; |
383 | register int i; | |
c9714ae3 | 384 | |
8429d022 | 385 | shmd = (struct shmdesc *)p->p_vmspace->vm_shm; |
9db58063 KM |
386 | for (i = 0; i < shminfo.shmseg; i++, shmd++) |
387 | if (shmd->shmd_uva) | |
388 | shmufree(p, shmd); | |
8429d022 MK |
389 | free((caddr_t)p->p_vmspace->vm_shm, M_SHM); |
390 | p->p_vmspace->vm_shm = NULL; | |
6f843dc9 KM |
391 | } |
392 | ||
393 | shmvalid(id) | |
394 | register int id; | |
395 | { | |
396 | register struct shmid_ds *shp; | |
397 | ||
398 | if (id < 0 || (id % SHMMMNI) >= shminfo.shmmni) | |
161c14a2 | 399 | return(EINVAL); |
6f843dc9 KM |
400 | shp = &shmsegs[id % SHMMMNI]; |
401 | if (shp->shm_perm.seq == (id / SHMMMNI) && | |
402 | (shp->shm_perm.mode & (SHM_ALLOC|SHM_DEST)) == SHM_ALLOC) | |
161c14a2 KM |
403 | return(0); |
404 | return(EINVAL); | |
6f843dc9 KM |
405 | } |
406 | ||
407 | /* | |
408 | * Free user resources associated with a shared memory segment | |
409 | */ | |
9db58063 | 410 | shmufree(p, shmd) |
c9714ae3 | 411 | struct proc *p; |
9db58063 | 412 | struct shmdesc *shmd; |
6f843dc9 KM |
413 | { |
414 | register struct shmid_ds *shp; | |
415 | ||
9db58063 | 416 | shp = &shmsegs[shmd->shmd_id % SHMMMNI]; |
aa6d6b7e | 417 | (void) vm_deallocate(&p->p_vmspace->vm_map, shmd->shmd_uva, |
9db58063 KM |
418 | ctob(clrnd(btoc(shp->shm_segsz)))); |
419 | shmd->shmd_id = 0; | |
420 | shmd->shmd_uva = 0; | |
6f843dc9 KM |
421 | shp->shm_dtime = time.tv_sec; |
422 | if (--shp->shm_nattch <= 0 && (shp->shm_perm.mode & SHM_DEST)) | |
423 | shmfree(shp); | |
424 | } | |
425 | ||
426 | /* | |
427 | * Deallocate resources associated with a shared memory segment | |
428 | */ | |
429 | shmfree(shp) | |
430 | register struct shmid_ds *shp; | |
431 | { | |
6f843dc9 KM |
432 | |
433 | if (shp->shm_handle == NULL) | |
434 | panic("shmfree"); | |
9db58063 KM |
435 | /* |
436 | * Lose our lingering object reference by deallocating space | |
437 | * in kernel. Pager will also be deallocated as a side-effect. | |
438 | */ | |
439 | vm_deallocate(shm_map, | |
440 | ((struct shmhandle *)shp->shm_handle)->shmh_kva, | |
9d81fbb9 | 441 | ctob(clrnd(btoc(shp->shm_segsz)))); |
9db58063 | 442 | free((caddr_t)shp->shm_handle, M_SHM); |
6f843dc9 KM |
443 | shp->shm_handle = NULL; |
444 | shmtot -= clrnd(btoc(shp->shm_segsz)); | |
445 | shp->shm_perm.mode = 0; | |
446 | /* | |
447 | * Increment the sequence number to ensure that outstanding | |
448 | * shmids for this segment will be invalid in the event that | |
449 | * the segment is reallocated. Note that shmids must be | |
450 | * positive as decreed by SVID. | |
451 | */ | |
452 | shp->shm_perm.seq++; | |
453 | if ((int)(shp->shm_perm.seq * SHMMMNI) < 0) | |
454 | shp->shm_perm.seq = 0; | |
455 | } | |
456 | ||
457 | /* | |
458 | * XXX This routine would be common to all sysV style IPC | |
459 | * (if the others were implemented). | |
460 | */ | |
161c14a2 | 461 | ipcaccess(ipc, mode, cred) |
6f843dc9 | 462 | register struct ipc_perm *ipc; |
161c14a2 KM |
463 | int mode; |
464 | register struct ucred *cred; | |
6f843dc9 KM |
465 | { |
466 | register int m; | |
467 | ||
161c14a2 | 468 | if (cred->cr_uid == 0) |
6f843dc9 KM |
469 | return(0); |
470 | /* | |
471 | * Access check is based on only one of owner, group, public. | |
472 | * If not owner, then check group. | |
473 | * If not a member of the group, then check public access. | |
474 | */ | |
475 | mode &= 0700; | |
476 | m = ipc->mode; | |
161c14a2 | 477 | if (cred->cr_uid != ipc->uid && cred->cr_uid != ipc->cuid) { |
6f843dc9 | 478 | m <<= 3; |
161c14a2 KM |
479 | if (!groupmember(ipc->gid, cred) && |
480 | !groupmember(ipc->cgid, cred)) | |
6f843dc9 KM |
481 | m <<= 3; |
482 | } | |
483 | if ((mode&m) == mode) | |
161c14a2 KM |
484 | return (0); |
485 | return (EACCES); | |
6f843dc9 | 486 | } |
6f843dc9 | 487 | #endif /* SYSVSHM */ |