Commit | Line | Data |
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cc6b488e KM |
1 | /* |
2 | * Copyright (c) 1990 The Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
dbf0c423 | 5 | * %sccs.include.redist.c% |
cc6b488e | 6 | * |
a7357432 | 7 | * @(#)fifo_vnops.c 7.17 (Berkeley) %G% |
cc6b488e KM |
8 | */ |
9 | ||
a7357432 KM |
10 | #include <sys/param.h> |
11 | #include <sys/proc.h> | |
12 | #include <sys/time.h> | |
13 | #include <sys/namei.h> | |
14 | #include <sys/vnode.h> | |
15 | #include <sys/socket.h> | |
16 | #include <sys/socketvar.h> | |
17 | #include <sys/stat.h> | |
18 | #include <sys/systm.h> | |
19 | #include <sys/ioctl.h> | |
20 | #include <sys/file.h> | |
21 | #include <sys/errno.h> | |
22 | #include <sys/malloc.h> | |
23 | #include <miscfs/fifofs/fifo.h> | |
cc6b488e KM |
24 | |
25 | /* | |
26 | * This structure is associated with the FIFO vnode and stores | |
27 | * the state associated with the FIFO. | |
28 | */ | |
29 | struct fifoinfo { | |
30 | struct socket *fi_readsock; | |
31 | struct socket *fi_writesock; | |
32 | long fi_readers; | |
33 | long fi_writers; | |
34 | }; | |
35 | ||
9342689a JH |
36 | int (**fifo_vnodeop_p)(); |
37 | struct vnodeopv_entry_desc fifo_vnodeop_entries[] = { | |
38 | { &vop_default_desc, vn_default_error }, | |
39 | { &vop_lookup_desc, fifo_lookup }, /* lookup */ | |
40 | { &vop_create_desc, fifo_create }, /* create */ | |
41 | { &vop_mknod_desc, fifo_mknod }, /* mknod */ | |
a7357432 | 42 | { &vop_open_desc, fifo_open }, /* open */ |
9342689a JH |
43 | { &vop_close_desc, fifo_close }, /* close */ |
44 | { &vop_access_desc, fifo_access }, /* access */ | |
45 | { &vop_getattr_desc, fifo_getattr }, /* getattr */ | |
46 | { &vop_setattr_desc, fifo_setattr }, /* setattr */ | |
a7357432 | 47 | { &vop_read_desc, fifo_read }, /* read */ |
9342689a JH |
48 | { &vop_write_desc, fifo_write }, /* write */ |
49 | { &vop_ioctl_desc, fifo_ioctl }, /* ioctl */ | |
50 | { &vop_select_desc, fifo_select }, /* select */ | |
a7357432 | 51 | { &vop_mmap_desc, fifo_mmap }, /* mmap */ |
9342689a | 52 | { &vop_fsync_desc, fifo_fsync }, /* fsync */ |
a7357432 | 53 | { &vop_seek_desc, fifo_seek }, /* seek */ |
9342689a | 54 | { &vop_remove_desc, fifo_remove }, /* remove */ |
a7357432 | 55 | { &vop_link_desc, fifo_link }, /* link */ |
9342689a JH |
56 | { &vop_rename_desc, fifo_rename }, /* rename */ |
57 | { &vop_mkdir_desc, fifo_mkdir }, /* mkdir */ | |
58 | { &vop_rmdir_desc, fifo_rmdir }, /* rmdir */ | |
59 | { &vop_symlink_desc, fifo_symlink }, /* symlink */ | |
60 | { &vop_readdir_desc, fifo_readdir }, /* readdir */ | |
61 | { &vop_readlink_desc, fifo_readlink }, /* readlink */ | |
62 | { &vop_abortop_desc, fifo_abortop }, /* abortop */ | |
63 | { &vop_inactive_desc, fifo_inactive }, /* inactive */ | |
64 | { &vop_reclaim_desc, fifo_reclaim }, /* reclaim */ | |
a7357432 | 65 | { &vop_lock_desc, fifo_lock }, /* lock */ |
9342689a | 66 | { &vop_unlock_desc, fifo_unlock }, /* unlock */ |
a7357432 | 67 | { &vop_bmap_desc, fifo_bmap }, /* bmap */ |
9342689a JH |
68 | { &vop_strategy_desc, fifo_strategy }, /* strategy */ |
69 | { &vop_print_desc, fifo_print }, /* print */ | |
70 | { &vop_islocked_desc, fifo_islocked }, /* islocked */ | |
71 | { &vop_advlock_desc, fifo_advlock }, /* advlock */ | |
72 | { &vop_blkatoff_desc, fifo_blkatoff }, /* blkatoff */ | |
9342689a JH |
73 | { &vop_valloc_desc, fifo_valloc }, /* valloc */ |
74 | { &vop_vfree_desc, fifo_vfree }, /* vfree */ | |
75 | { &vop_truncate_desc, fifo_truncate }, /* truncate */ | |
76 | { &vop_update_desc, fifo_update }, /* update */ | |
77 | { &vop_bwrite_desc, fifo_bwrite }, /* bwrite */ | |
78 | { (struct vnodeop_desc*)NULL, (int(*)())NULL } | |
cc6b488e | 79 | }; |
9342689a JH |
80 | struct vnodeopv_desc fifo_vnodeop_opv_desc = |
81 | { &fifo_vnodeop_p, fifo_vnodeop_entries }; | |
cc6b488e KM |
82 | |
83 | /* | |
84 | * Trivial lookup routine that always fails. | |
85 | */ | |
81b4c293 | 86 | /* ARGSUSED */ |
8ea8cd47 KM |
87 | fifo_lookup(ap) |
88 | struct vop_lookup_args /* { | |
89 | struct vnode * a_dvp; | |
90 | struct vnode ** a_vpp; | |
91 | struct componentname * a_cnp; | |
92 | } */ *ap; | |
cc6b488e | 93 | { |
085e9ab7 | 94 | |
e1b76915 | 95 | *ap->a_vpp = NULL; |
cc6b488e KM |
96 | return (ENOTDIR); |
97 | } | |
98 | ||
99 | /* | |
100 | * Open called to set up a new instance of a fifo or | |
101 | * to find an active instance of a fifo. | |
102 | */ | |
103 | /* ARGSUSED */ | |
8ea8cd47 KM |
104 | fifo_open(ap) |
105 | struct vop_open_args /* { | |
106 | struct vnode *a_vp; | |
107 | int a_mode; | |
108 | struct ucred *a_cred; | |
109 | struct proc *a_p; | |
110 | } */ *ap; | |
cc6b488e | 111 | { |
406c9a0d | 112 | register struct vnode *vp = ap->a_vp; |
cc6b488e KM |
113 | register struct fifoinfo *fip; |
114 | struct socket *rso, *wso; | |
115 | int error; | |
bcc829cc | 116 | static char openstr[] = "fifo"; |
cc6b488e | 117 | |
e1b76915 | 118 | if ((ap->a_mode & (FREAD|FWRITE)) == (FREAD|FWRITE)) |
cc6b488e | 119 | return (EINVAL); |
406c9a0d | 120 | if ((fip = vp->v_fifoinfo) == NULL) { |
cc6b488e | 121 | MALLOC(fip, struct fifoinfo *, sizeof(*fip), M_VNODE, M_WAITOK); |
406c9a0d | 122 | vp->v_fifoinfo = fip; |
ed89f575 KM |
123 | if (error = socreate(AF_UNIX, &rso, SOCK_STREAM, 0)) { |
124 | free(fip, M_VNODE); | |
406c9a0d | 125 | vp->v_fifoinfo = NULL; |
cc6b488e | 126 | return (error); |
ed89f575 | 127 | } |
cc6b488e KM |
128 | fip->fi_readsock = rso; |
129 | if (error = socreate(AF_UNIX, &wso, SOCK_STREAM, 0)) { | |
130 | (void)soclose(rso); | |
ed89f575 | 131 | free(fip, M_VNODE); |
406c9a0d | 132 | vp->v_fifoinfo = NULL; |
cc6b488e KM |
133 | return (error); |
134 | } | |
135 | fip->fi_writesock = wso; | |
136 | if (error = unp_connect2(wso, rso)) { | |
137 | (void)soclose(wso); | |
138 | (void)soclose(rso); | |
ed89f575 | 139 | free(fip, M_VNODE); |
406c9a0d | 140 | vp->v_fifoinfo = NULL; |
cc6b488e KM |
141 | return (error); |
142 | } | |
80c4c463 | 143 | fip->fi_readers = fip->fi_writers = 0; |
cc6b488e KM |
144 | wso->so_state |= SS_CANTRCVMORE; |
145 | rso->so_state |= SS_CANTSENDMORE; | |
146 | } | |
147 | error = 0; | |
e1b76915 | 148 | if (ap->a_mode & FREAD) { |
cc6b488e KM |
149 | fip->fi_readers++; |
150 | if (fip->fi_readers == 1) { | |
151 | fip->fi_writesock->so_state &= ~SS_CANTSENDMORE; | |
152 | if (fip->fi_writers > 0) | |
153 | wakeup((caddr_t)&fip->fi_writers); | |
154 | } | |
e1b76915 | 155 | if (ap->a_mode & O_NONBLOCK) |
cc6b488e | 156 | return (0); |
80c4c463 | 157 | while (fip->fi_writers == 0) { |
406c9a0d | 158 | VOP_UNLOCK(vp); |
80c4c463 KM |
159 | error = tsleep((caddr_t)&fip->fi_readers, PSOCK, |
160 | openstr, 0); | |
406c9a0d | 161 | VOP_LOCK(vp); |
80c4c463 | 162 | if (error) |
cc6b488e | 163 | break; |
80c4c463 | 164 | } |
cc6b488e KM |
165 | } else { |
166 | fip->fi_writers++; | |
e1b76915 | 167 | if (fip->fi_readers == 0 && (ap->a_mode & O_NONBLOCK)) { |
cc6b488e KM |
168 | error = ENXIO; |
169 | } else { | |
170 | if (fip->fi_writers == 1) { | |
171 | fip->fi_readsock->so_state &= ~SS_CANTRCVMORE; | |
172 | if (fip->fi_readers > 0) | |
173 | wakeup((caddr_t)&fip->fi_readers); | |
174 | } | |
80c4c463 | 175 | while (fip->fi_readers == 0) { |
406c9a0d | 176 | VOP_UNLOCK(vp); |
80c4c463 KM |
177 | error = tsleep((caddr_t)&fip->fi_writers, |
178 | PSOCK, openstr, 0); | |
406c9a0d | 179 | VOP_LOCK(vp); |
80c4c463 | 180 | if (error) |
cc6b488e | 181 | break; |
80c4c463 | 182 | } |
cc6b488e KM |
183 | } |
184 | } | |
185 | if (error) | |
406c9a0d | 186 | VOP_CLOSE(vp, ap->a_mode, ap->a_cred, ap->a_p); |
cc6b488e KM |
187 | return (error); |
188 | } | |
189 | ||
190 | /* | |
191 | * Vnode op for read | |
192 | */ | |
193 | /* ARGSUSED */ | |
8ea8cd47 KM |
194 | fifo_read(ap) |
195 | struct vop_read_args /* { | |
196 | struct vnode *a_vp; | |
197 | struct uio *a_uio; | |
198 | int a_ioflag; | |
199 | struct ucred *a_cred; | |
200 | } */ *ap; | |
cc6b488e | 201 | { |
406c9a0d | 202 | register struct uio *uio = ap->a_uio; |
e1b76915 | 203 | register struct socket *rso = ap->a_vp->v_fifoinfo->fi_readsock; |
cc6b488e KM |
204 | int error, startresid; |
205 | ||
81b4c293 | 206 | #ifdef DIAGNOSTIC |
406c9a0d | 207 | if (uio->uio_rw != UIO_READ) |
cc6b488e | 208 | panic("fifo_read mode"); |
81b4c293 | 209 | #endif |
406c9a0d | 210 | if (uio->uio_resid == 0) |
cc6b488e | 211 | return (0); |
e1b76915 | 212 | if (ap->a_ioflag & IO_NDELAY) |
cc6b488e | 213 | rso->so_state |= SS_NBIO; |
406c9a0d | 214 | startresid = uio->uio_resid; |
e1b76915 | 215 | VOP_UNLOCK(ap->a_vp); |
406c9a0d | 216 | error = soreceive(rso, (struct mbuf **)0, uio, (int *)0, |
cc6b488e | 217 | (struct mbuf **)0, (struct mbuf **)0); |
e1b76915 | 218 | VOP_LOCK(ap->a_vp); |
cc6b488e KM |
219 | /* |
220 | * Clear EOF indication after first such return. | |
221 | */ | |
406c9a0d | 222 | if (uio->uio_resid == startresid) |
cc6b488e | 223 | rso->so_state &= ~SS_CANTRCVMORE; |
e1b76915 | 224 | if (ap->a_ioflag & IO_NDELAY) |
cc6b488e KM |
225 | rso->so_state &= ~SS_NBIO; |
226 | return (error); | |
227 | } | |
228 | ||
229 | /* | |
230 | * Vnode op for write | |
231 | */ | |
232 | /* ARGSUSED */ | |
8ea8cd47 KM |
233 | fifo_write(ap) |
234 | struct vop_write_args /* { | |
235 | struct vnode *a_vp; | |
236 | struct uio *a_uio; | |
237 | int a_ioflag; | |
238 | struct ucred *a_cred; | |
239 | } */ *ap; | |
cc6b488e | 240 | { |
e1b76915 | 241 | struct socket *wso = ap->a_vp->v_fifoinfo->fi_writesock; |
cc6b488e KM |
242 | int error; |
243 | ||
81b4c293 | 244 | #ifdef DIAGNOSTIC |
e1b76915 | 245 | if (ap->a_uio->uio_rw != UIO_WRITE) |
cc6b488e | 246 | panic("fifo_write mode"); |
81b4c293 | 247 | #endif |
e1b76915 | 248 | if (ap->a_ioflag & IO_NDELAY) |
cc6b488e | 249 | wso->so_state |= SS_NBIO; |
e1b76915 JH |
250 | VOP_UNLOCK(ap->a_vp); |
251 | error = sosend(wso, (struct mbuf *)0, ap->a_uio, 0, (struct mbuf *)0, 0); | |
252 | VOP_LOCK(ap->a_vp); | |
253 | if (ap->a_ioflag & IO_NDELAY) | |
cc6b488e KM |
254 | wso->so_state &= ~SS_NBIO; |
255 | return (error); | |
256 | } | |
257 | ||
258 | /* | |
259 | * Device ioctl operation. | |
260 | */ | |
261 | /* ARGSUSED */ | |
8ea8cd47 KM |
262 | fifo_ioctl(ap) |
263 | struct vop_ioctl_args /* { | |
264 | struct vnode *a_vp; | |
265 | int a_command; | |
266 | caddr_t a_data; | |
267 | int a_fflag; | |
268 | struct ucred *a_cred; | |
269 | struct proc *a_p; | |
270 | } */ *ap; | |
cc6b488e KM |
271 | { |
272 | struct file filetmp; | |
273 | int error; | |
274 | ||
e1b76915 | 275 | if (ap->a_command == FIONBIO) |
cc6b488e | 276 | return (0); |
e1b76915 JH |
277 | if (ap->a_fflag & FREAD) |
278 | filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_readsock; | |
cc6b488e | 279 | else |
e1b76915 JH |
280 | filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_writesock; |
281 | return (soo_ioctl(&filetmp, ap->a_command, ap->a_data, ap->a_p)); | |
cc6b488e KM |
282 | } |
283 | ||
284 | /* ARGSUSED */ | |
8ea8cd47 KM |
285 | fifo_select(ap) |
286 | struct vop_select_args /* { | |
287 | struct vnode *a_vp; | |
288 | int a_which; | |
289 | int a_fflags; | |
290 | struct ucred *a_cred; | |
291 | struct proc *a_p; | |
292 | } */ *ap; | |
cc6b488e KM |
293 | { |
294 | struct file filetmp; | |
295 | int error; | |
296 | ||
e1b76915 JH |
297 | if (ap->a_fflags & FREAD) |
298 | filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_readsock; | |
cc6b488e | 299 | else |
e1b76915 JH |
300 | filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_writesock; |
301 | return (soo_select(&filetmp, ap->a_which, ap->a_p)); | |
cc6b488e KM |
302 | } |
303 | ||
304 | /* | |
305 | * This is a noop, simply returning what one has been given. | |
306 | */ | |
8ea8cd47 KM |
307 | fifo_bmap(ap) |
308 | struct vop_bmap_args /* { | |
309 | struct vnode *a_vp; | |
310 | daddr_t a_bn; | |
311 | struct vnode **a_vpp; | |
312 | daddr_t *a_bnp; | |
313 | } */ *ap; | |
cc6b488e KM |
314 | { |
315 | ||
e1b76915 JH |
316 | if (ap->a_vpp != NULL) |
317 | *ap->a_vpp = ap->a_vp; | |
318 | if (ap->a_bnp != NULL) | |
319 | *ap->a_bnp = ap->a_bn; | |
cc6b488e KM |
320 | return (0); |
321 | } | |
322 | ||
323 | /* | |
324 | * At the moment we do not do any locking. | |
325 | */ | |
326 | /* ARGSUSED */ | |
8ea8cd47 KM |
327 | fifo_lock(ap) |
328 | struct vop_lock_args /* { | |
329 | struct vnode *a_vp; | |
330 | } */ *ap; | |
cc6b488e KM |
331 | { |
332 | ||
333 | return (0); | |
334 | } | |
335 | ||
336 | /* ARGSUSED */ | |
8ea8cd47 KM |
337 | fifo_unlock(ap) |
338 | struct vop_unlock_args /* { | |
339 | struct vnode *a_vp; | |
340 | } */ *ap; | |
cc6b488e KM |
341 | { |
342 | ||
343 | return (0); | |
344 | } | |
345 | ||
346 | /* | |
347 | * Device close routine | |
348 | */ | |
349 | /* ARGSUSED */ | |
8ea8cd47 KM |
350 | fifo_close(ap) |
351 | struct vop_close_args /* { | |
352 | struct vnode *a_vp; | |
353 | int a_fflag; | |
354 | struct ucred *a_cred; | |
355 | struct proc *a_p; | |
356 | } */ *ap; | |
cc6b488e | 357 | { |
406c9a0d JH |
358 | register struct vnode *vp = ap->a_vp; |
359 | register struct fifoinfo *fip = vp->v_fifoinfo; | |
cc6b488e KM |
360 | int error1, error2; |
361 | ||
e1b76915 | 362 | if (ap->a_fflag & FWRITE) { |
cc6b488e KM |
363 | fip->fi_writers--; |
364 | if (fip->fi_writers == 0) | |
365 | socantrcvmore(fip->fi_readsock); | |
366 | } else { | |
367 | fip->fi_readers--; | |
368 | if (fip->fi_readers == 0) | |
369 | socantsendmore(fip->fi_writesock); | |
370 | } | |
406c9a0d | 371 | if (vp->v_usecount > 1) |
cc6b488e KM |
372 | return (0); |
373 | error1 = soclose(fip->fi_readsock); | |
374 | error2 = soclose(fip->fi_writesock); | |
375 | FREE(fip, M_VNODE); | |
406c9a0d | 376 | vp->v_fifoinfo = NULL; |
cc6b488e KM |
377 | if (error1) |
378 | return (error1); | |
379 | return (error2); | |
380 | } | |
381 | ||
382 | /* | |
383 | * Print out the contents of a fifo vnode. | |
384 | */ | |
8ea8cd47 KM |
385 | fifo_print(ap) |
386 | struct vop_print_args /* { | |
387 | struct vnode *a_vp; | |
388 | } */ *ap; | |
cc6b488e KM |
389 | { |
390 | ||
391 | printf("tag VT_NON"); | |
e1b76915 | 392 | fifo_printinfo(ap->a_vp); |
cc6b488e KM |
393 | printf("\n"); |
394 | } | |
395 | ||
396 | /* | |
397 | * Print out internal contents of a fifo vnode. | |
398 | */ | |
399 | fifo_printinfo(vp) | |
400 | struct vnode *vp; | |
401 | { | |
402 | register struct fifoinfo *fip = vp->v_fifoinfo; | |
403 | ||
404 | printf(", fifo with %d readers and %d writers", | |
405 | fip->fi_readers, fip->fi_writers); | |
406 | } | |
407 | ||
408 | /* | |
409 | * Fifo failed operation | |
410 | */ | |
411 | fifo_ebadf() | |
412 | { | |
413 | ||
414 | return (EBADF); | |
415 | } | |
416 | ||
a4128336 KM |
417 | /* |
418 | * Fifo advisory byte-level locks. | |
419 | */ | |
81b4c293 | 420 | /* ARGSUSED */ |
8ea8cd47 KM |
421 | fifo_advlock(ap) |
422 | struct vop_advlock_args /* { | |
423 | struct vnode *a_vp; | |
424 | caddr_t a_id; | |
425 | int a_op; | |
426 | struct flock *a_fl; | |
427 | int a_flags; | |
428 | } */ *ap; | |
a4128336 KM |
429 | { |
430 | ||
431 | return (EOPNOTSUPP); | |
432 | } | |
433 | ||
cc6b488e KM |
434 | /* |
435 | * Fifo bad operation | |
436 | */ | |
437 | fifo_badop() | |
438 | { | |
439 | ||
440 | panic("fifo_badop called"); | |
441 | /* NOTREACHED */ | |
442 | } |