Commit | Line | Data |
---|---|---|
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 | * |
e1b76915 | 7 | * @(#)fifo_vnops.c 7.14 (Berkeley) %G% |
cc6b488e KM |
8 | */ |
9 | ||
10 | #include "param.h" | |
063b2136 | 11 | #include "proc.h" |
cc6b488e KM |
12 | #include "time.h" |
13 | #include "namei.h" | |
14 | #include "vnode.h" | |
15 | #include "socket.h" | |
16 | #include "socketvar.h" | |
17 | #include "stat.h" | |
8429d022 | 18 | #include "systm.h" |
cc6b488e KM |
19 | #include "ioctl.h" |
20 | #include "file.h" | |
81b4c293 | 21 | #include "fifo.h" |
cc6b488e KM |
22 | #include "errno.h" |
23 | #include "malloc.h" | |
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 */ | |
42 | { &vop_open_desc, fifo_open }, /* open */ | |
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 */ | |
47 | { &vop_read_desc, fifo_read }, /* read */ | |
48 | { &vop_write_desc, fifo_write }, /* write */ | |
49 | { &vop_ioctl_desc, fifo_ioctl }, /* ioctl */ | |
50 | { &vop_select_desc, fifo_select }, /* select */ | |
51 | { &vop_mmap_desc, fifo_mmap }, /* mmap */ | |
52 | { &vop_fsync_desc, fifo_fsync }, /* fsync */ | |
53 | { &vop_seek_desc, fifo_seek }, /* seek */ | |
54 | { &vop_remove_desc, fifo_remove }, /* remove */ | |
55 | { &vop_link_desc, fifo_link }, /* link */ | |
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 */ | |
65 | { &vop_lock_desc, fifo_lock }, /* lock */ | |
66 | { &vop_unlock_desc, fifo_unlock }, /* unlock */ | |
67 | { &vop_bmap_desc, fifo_bmap }, /* bmap */ | |
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 */ | |
73 | { &vop_vget_desc, fifo_vget }, /* vget */ | |
74 | { &vop_valloc_desc, fifo_valloc }, /* valloc */ | |
75 | { &vop_vfree_desc, fifo_vfree }, /* vfree */ | |
76 | { &vop_truncate_desc, fifo_truncate }, /* truncate */ | |
77 | { &vop_update_desc, fifo_update }, /* update */ | |
78 | { &vop_bwrite_desc, fifo_bwrite }, /* bwrite */ | |
79 | { (struct vnodeop_desc*)NULL, (int(*)())NULL } | |
cc6b488e | 80 | }; |
9342689a JH |
81 | struct vnodeopv_desc fifo_vnodeop_opv_desc = |
82 | { &fifo_vnodeop_p, fifo_vnodeop_entries }; | |
cc6b488e KM |
83 | |
84 | /* | |
85 | * Trivial lookup routine that always fails. | |
86 | */ | |
81b4c293 | 87 | /* ARGSUSED */ |
9342689a JH |
88 | fifo_lookup (ap) |
89 | struct vop_lookup_args *ap; | |
cc6b488e | 90 | { |
085e9ab7 | 91 | |
e1b76915 | 92 | *ap->a_vpp = NULL; |
cc6b488e KM |
93 | return (ENOTDIR); |
94 | } | |
95 | ||
96 | /* | |
97 | * Open called to set up a new instance of a fifo or | |
98 | * to find an active instance of a fifo. | |
99 | */ | |
100 | /* ARGSUSED */ | |
9342689a JH |
101 | fifo_open (ap) |
102 | struct vop_open_args *ap; | |
cc6b488e | 103 | { |
9342689a JH |
104 | USES_VOP_CLOSE; |
105 | USES_VOP_LOCK; | |
106 | USES_VOP_UNLOCK; | |
cc6b488e KM |
107 | register struct fifoinfo *fip; |
108 | struct socket *rso, *wso; | |
109 | int error; | |
bcc829cc | 110 | static char openstr[] = "fifo"; |
cc6b488e | 111 | |
e1b76915 | 112 | if ((ap->a_mode & (FREAD|FWRITE)) == (FREAD|FWRITE)) |
cc6b488e | 113 | return (EINVAL); |
e1b76915 | 114 | if ((fip = ap->a_vp->v_fifoinfo) == NULL) { |
cc6b488e | 115 | MALLOC(fip, struct fifoinfo *, sizeof(*fip), M_VNODE, M_WAITOK); |
e1b76915 | 116 | ap->a_vp->v_fifoinfo = fip; |
ed89f575 KM |
117 | if (error = socreate(AF_UNIX, &rso, SOCK_STREAM, 0)) { |
118 | free(fip, M_VNODE); | |
e1b76915 | 119 | ap->a_vp->v_fifoinfo = NULL; |
cc6b488e | 120 | return (error); |
ed89f575 | 121 | } |
cc6b488e KM |
122 | fip->fi_readsock = rso; |
123 | if (error = socreate(AF_UNIX, &wso, SOCK_STREAM, 0)) { | |
124 | (void)soclose(rso); | |
ed89f575 | 125 | free(fip, M_VNODE); |
e1b76915 | 126 | ap->a_vp->v_fifoinfo = NULL; |
cc6b488e KM |
127 | return (error); |
128 | } | |
129 | fip->fi_writesock = wso; | |
130 | if (error = unp_connect2(wso, rso)) { | |
131 | (void)soclose(wso); | |
132 | (void)soclose(rso); | |
ed89f575 | 133 | free(fip, M_VNODE); |
e1b76915 | 134 | ap->a_vp->v_fifoinfo = NULL; |
cc6b488e KM |
135 | return (error); |
136 | } | |
80c4c463 | 137 | fip->fi_readers = fip->fi_writers = 0; |
cc6b488e KM |
138 | wso->so_state |= SS_CANTRCVMORE; |
139 | rso->so_state |= SS_CANTSENDMORE; | |
140 | } | |
141 | error = 0; | |
e1b76915 | 142 | if (ap->a_mode & FREAD) { |
cc6b488e KM |
143 | fip->fi_readers++; |
144 | if (fip->fi_readers == 1) { | |
145 | fip->fi_writesock->so_state &= ~SS_CANTSENDMORE; | |
146 | if (fip->fi_writers > 0) | |
147 | wakeup((caddr_t)&fip->fi_writers); | |
148 | } | |
e1b76915 | 149 | if (ap->a_mode & O_NONBLOCK) |
cc6b488e | 150 | return (0); |
80c4c463 | 151 | while (fip->fi_writers == 0) { |
e1b76915 | 152 | VOP_UNLOCK(ap->a_vp); |
80c4c463 KM |
153 | error = tsleep((caddr_t)&fip->fi_readers, PSOCK, |
154 | openstr, 0); | |
e1b76915 | 155 | VOP_LOCK(ap->a_vp); |
80c4c463 | 156 | if (error) |
cc6b488e | 157 | break; |
80c4c463 | 158 | } |
cc6b488e KM |
159 | } else { |
160 | fip->fi_writers++; | |
e1b76915 | 161 | if (fip->fi_readers == 0 && (ap->a_mode & O_NONBLOCK)) { |
cc6b488e KM |
162 | error = ENXIO; |
163 | } else { | |
164 | if (fip->fi_writers == 1) { | |
165 | fip->fi_readsock->so_state &= ~SS_CANTRCVMORE; | |
166 | if (fip->fi_readers > 0) | |
167 | wakeup((caddr_t)&fip->fi_readers); | |
168 | } | |
80c4c463 | 169 | while (fip->fi_readers == 0) { |
e1b76915 | 170 | VOP_UNLOCK(ap->a_vp); |
80c4c463 KM |
171 | error = tsleep((caddr_t)&fip->fi_writers, |
172 | PSOCK, openstr, 0); | |
e1b76915 | 173 | VOP_LOCK(ap->a_vp); |
80c4c463 | 174 | if (error) |
cc6b488e | 175 | break; |
80c4c463 | 176 | } |
cc6b488e KM |
177 | } |
178 | } | |
179 | if (error) | |
e1b76915 | 180 | VOP_CLOSE(ap->a_vp, ap->a_mode, ap->a_cred, ap->a_p); |
cc6b488e KM |
181 | return (error); |
182 | } | |
183 | ||
184 | /* | |
185 | * Vnode op for read | |
186 | */ | |
187 | /* ARGSUSED */ | |
9342689a JH |
188 | fifo_read (ap) |
189 | struct vop_read_args *ap; | |
cc6b488e | 190 | { |
9342689a JH |
191 | USES_VOP_LOCK; |
192 | USES_VOP_UNLOCK; | |
e1b76915 | 193 | register struct socket *rso = ap->a_vp->v_fifoinfo->fi_readsock; |
cc6b488e KM |
194 | int error, startresid; |
195 | ||
81b4c293 | 196 | #ifdef DIAGNOSTIC |
e1b76915 | 197 | if (ap->a_uio->uio_rw != UIO_READ) |
cc6b488e | 198 | panic("fifo_read mode"); |
81b4c293 | 199 | #endif |
e1b76915 | 200 | if (ap->a_uio->uio_resid == 0) |
cc6b488e | 201 | return (0); |
e1b76915 | 202 | if (ap->a_ioflag & IO_NDELAY) |
cc6b488e | 203 | rso->so_state |= SS_NBIO; |
e1b76915 JH |
204 | startresid = ap->a_uio->uio_resid; |
205 | VOP_UNLOCK(ap->a_vp); | |
206 | error = soreceive(rso, (struct mbuf **)0, ap->a_uio, (int *)0, | |
cc6b488e | 207 | (struct mbuf **)0, (struct mbuf **)0); |
e1b76915 | 208 | VOP_LOCK(ap->a_vp); |
cc6b488e KM |
209 | /* |
210 | * Clear EOF indication after first such return. | |
211 | */ | |
e1b76915 | 212 | if (ap->a_uio->uio_resid == startresid) |
cc6b488e | 213 | rso->so_state &= ~SS_CANTRCVMORE; |
e1b76915 | 214 | if (ap->a_ioflag & IO_NDELAY) |
cc6b488e KM |
215 | rso->so_state &= ~SS_NBIO; |
216 | return (error); | |
217 | } | |
218 | ||
219 | /* | |
220 | * Vnode op for write | |
221 | */ | |
222 | /* ARGSUSED */ | |
9342689a JH |
223 | fifo_write (ap) |
224 | struct vop_write_args *ap; | |
cc6b488e | 225 | { |
9342689a JH |
226 | USES_VOP_LOCK; |
227 | USES_VOP_UNLOCK; | |
e1b76915 | 228 | struct socket *wso = ap->a_vp->v_fifoinfo->fi_writesock; |
cc6b488e KM |
229 | int error; |
230 | ||
81b4c293 | 231 | #ifdef DIAGNOSTIC |
e1b76915 | 232 | if (ap->a_uio->uio_rw != UIO_WRITE) |
cc6b488e | 233 | panic("fifo_write mode"); |
81b4c293 | 234 | #endif |
e1b76915 | 235 | if (ap->a_ioflag & IO_NDELAY) |
cc6b488e | 236 | wso->so_state |= SS_NBIO; |
e1b76915 JH |
237 | VOP_UNLOCK(ap->a_vp); |
238 | error = sosend(wso, (struct mbuf *)0, ap->a_uio, 0, (struct mbuf *)0, 0); | |
239 | VOP_LOCK(ap->a_vp); | |
240 | if (ap->a_ioflag & IO_NDELAY) | |
cc6b488e KM |
241 | wso->so_state &= ~SS_NBIO; |
242 | return (error); | |
243 | } | |
244 | ||
245 | /* | |
246 | * Device ioctl operation. | |
247 | */ | |
248 | /* ARGSUSED */ | |
9342689a JH |
249 | fifo_ioctl (ap) |
250 | struct vop_ioctl_args *ap; | |
cc6b488e KM |
251 | { |
252 | struct file filetmp; | |
253 | int error; | |
254 | ||
e1b76915 | 255 | if (ap->a_command == FIONBIO) |
cc6b488e | 256 | return (0); |
e1b76915 JH |
257 | if (ap->a_fflag & FREAD) |
258 | filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_readsock; | |
cc6b488e | 259 | else |
e1b76915 JH |
260 | filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_writesock; |
261 | return (soo_ioctl(&filetmp, ap->a_command, ap->a_data, ap->a_p)); | |
cc6b488e KM |
262 | } |
263 | ||
264 | /* ARGSUSED */ | |
9342689a JH |
265 | fifo_select (ap) |
266 | struct vop_select_args *ap; | |
cc6b488e KM |
267 | { |
268 | struct file filetmp; | |
269 | int error; | |
270 | ||
e1b76915 JH |
271 | if (ap->a_fflags & FREAD) |
272 | filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_readsock; | |
cc6b488e | 273 | else |
e1b76915 JH |
274 | filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_writesock; |
275 | return (soo_select(&filetmp, ap->a_which, ap->a_p)); | |
cc6b488e KM |
276 | } |
277 | ||
278 | /* | |
279 | * This is a noop, simply returning what one has been given. | |
280 | */ | |
9342689a JH |
281 | fifo_bmap (ap) |
282 | struct vop_bmap_args *ap; | |
cc6b488e KM |
283 | { |
284 | ||
e1b76915 JH |
285 | if (ap->a_vpp != NULL) |
286 | *ap->a_vpp = ap->a_vp; | |
287 | if (ap->a_bnp != NULL) | |
288 | *ap->a_bnp = ap->a_bn; | |
cc6b488e KM |
289 | return (0); |
290 | } | |
291 | ||
292 | /* | |
293 | * At the moment we do not do any locking. | |
294 | */ | |
295 | /* ARGSUSED */ | |
9342689a JH |
296 | fifo_lock (ap) |
297 | struct vop_lock_args *ap; | |
cc6b488e KM |
298 | { |
299 | ||
300 | return (0); | |
301 | } | |
302 | ||
303 | /* ARGSUSED */ | |
9342689a JH |
304 | fifo_unlock (ap) |
305 | struct vop_unlock_args *ap; | |
cc6b488e KM |
306 | { |
307 | ||
308 | return (0); | |
309 | } | |
310 | ||
311 | /* | |
312 | * Device close routine | |
313 | */ | |
314 | /* ARGSUSED */ | |
9342689a JH |
315 | fifo_close (ap) |
316 | struct vop_close_args *ap; | |
cc6b488e | 317 | { |
e1b76915 | 318 | register struct fifoinfo *fip = ap->a_vp->v_fifoinfo; |
cc6b488e KM |
319 | int error1, error2; |
320 | ||
e1b76915 | 321 | if (ap->a_fflag & FWRITE) { |
cc6b488e KM |
322 | fip->fi_writers--; |
323 | if (fip->fi_writers == 0) | |
324 | socantrcvmore(fip->fi_readsock); | |
325 | } else { | |
326 | fip->fi_readers--; | |
327 | if (fip->fi_readers == 0) | |
328 | socantsendmore(fip->fi_writesock); | |
329 | } | |
e1b76915 | 330 | if (ap->a_vp->v_usecount > 1) |
cc6b488e KM |
331 | return (0); |
332 | error1 = soclose(fip->fi_readsock); | |
333 | error2 = soclose(fip->fi_writesock); | |
334 | FREE(fip, M_VNODE); | |
e1b76915 | 335 | ap->a_vp->v_fifoinfo = NULL; |
cc6b488e KM |
336 | if (error1) |
337 | return (error1); | |
338 | return (error2); | |
339 | } | |
340 | ||
341 | /* | |
342 | * Print out the contents of a fifo vnode. | |
343 | */ | |
9342689a JH |
344 | fifo_print (ap) |
345 | struct vop_print_args *ap; | |
cc6b488e KM |
346 | { |
347 | ||
348 | printf("tag VT_NON"); | |
e1b76915 | 349 | fifo_printinfo(ap->a_vp); |
cc6b488e KM |
350 | printf("\n"); |
351 | } | |
352 | ||
353 | /* | |
354 | * Print out internal contents of a fifo vnode. | |
355 | */ | |
356 | fifo_printinfo(vp) | |
357 | struct vnode *vp; | |
358 | { | |
359 | register struct fifoinfo *fip = vp->v_fifoinfo; | |
360 | ||
361 | printf(", fifo with %d readers and %d writers", | |
362 | fip->fi_readers, fip->fi_writers); | |
363 | } | |
364 | ||
365 | /* | |
366 | * Fifo failed operation | |
367 | */ | |
368 | fifo_ebadf() | |
369 | { | |
370 | ||
371 | return (EBADF); | |
372 | } | |
373 | ||
a4128336 KM |
374 | /* |
375 | * Fifo advisory byte-level locks. | |
376 | */ | |
81b4c293 | 377 | /* ARGSUSED */ |
9342689a JH |
378 | fifo_advlock (ap) |
379 | struct vop_advlock_args *ap; | |
a4128336 KM |
380 | { |
381 | ||
382 | return (EOPNOTSUPP); | |
383 | } | |
384 | ||
cc6b488e KM |
385 | /* |
386 | * Fifo bad operation | |
387 | */ | |
388 | fifo_badop() | |
389 | { | |
390 | ||
391 | panic("fifo_badop called"); | |
392 | /* NOTREACHED */ | |
393 | } |