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cc6b488e KM |
1 | /* |
2 | * Copyright (c) 1990 The Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms are permitted | |
6 | * provided that the above copyright notice and this paragraph are | |
7 | * duplicated in all such forms and that any documentation, | |
8 | * advertising materials, and other materials related to such | |
9 | * distribution and use acknowledge that the software was developed | |
10 | * by the University of California, Berkeley. The name of the | |
11 | * University may not be used to endorse or promote products derived | |
12 | * from this software without specific prior written permission. | |
13 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR | |
14 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED | |
15 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. | |
16 | * | |
bcc829cc | 17 | * @(#)fifo_vnops.c 7.2 (Berkeley) %G% |
cc6b488e KM |
18 | */ |
19 | ||
20 | #include "param.h" | |
21 | #include "time.h" | |
22 | #include "namei.h" | |
23 | #include "vnode.h" | |
24 | #include "socket.h" | |
25 | #include "socketvar.h" | |
26 | #include "stat.h" | |
27 | #include "ioctl.h" | |
28 | #include "file.h" | |
29 | #include "errno.h" | |
30 | #include "malloc.h" | |
31 | ||
32 | /* | |
33 | * This structure is associated with the FIFO vnode and stores | |
34 | * the state associated with the FIFO. | |
35 | */ | |
36 | struct fifoinfo { | |
37 | struct socket *fi_readsock; | |
38 | struct socket *fi_writesock; | |
39 | long fi_readers; | |
40 | long fi_writers; | |
41 | }; | |
42 | ||
43 | int fifo_lookup(), | |
44 | fifo_open(), | |
45 | fifo_read(), | |
46 | fifo_write(), | |
47 | fifo_strategy(), | |
48 | fifo_bmap(), | |
49 | fifo_ioctl(), | |
50 | fifo_select(), | |
51 | fifo_lock(), | |
52 | fifo_unlock(), | |
53 | fifo_close(), | |
54 | fifo_print(), | |
55 | fifo_ebadf(), | |
56 | fifo_badop(), | |
57 | fifo_nullop(); | |
58 | ||
59 | struct vnodeops fifo_vnodeops = { | |
60 | fifo_lookup, /* lookup */ | |
61 | fifo_badop, /* create */ | |
62 | fifo_badop, /* mknod */ | |
63 | fifo_open, /* open */ | |
64 | fifo_close, /* close */ | |
65 | fifo_ebadf, /* access */ | |
66 | fifo_ebadf, /* getattr */ | |
67 | fifo_ebadf, /* setattr */ | |
68 | fifo_read, /* read */ | |
69 | fifo_write, /* write */ | |
70 | fifo_ioctl, /* ioctl */ | |
71 | fifo_select, /* select */ | |
72 | fifo_badop, /* mmap */ | |
73 | fifo_nullop, /* fsync */ | |
74 | fifo_badop, /* seek */ | |
75 | fifo_badop, /* remove */ | |
76 | fifo_badop, /* link */ | |
77 | fifo_badop, /* rename */ | |
78 | fifo_badop, /* mkdir */ | |
79 | fifo_badop, /* rmdir */ | |
80 | fifo_badop, /* symlink */ | |
81 | fifo_badop, /* readdir */ | |
82 | fifo_badop, /* readlink */ | |
83 | fifo_badop, /* abortop */ | |
84 | fifo_nullop, /* inactive */ | |
85 | fifo_nullop, /* reclaim */ | |
86 | fifo_lock, /* lock */ | |
87 | fifo_unlock, /* unlock */ | |
88 | fifo_bmap, /* bmap */ | |
89 | fifo_badop, /* strategy */ | |
90 | fifo_print, /* print */ | |
91 | fifo_nullop, /* islocked */ | |
92 | }; | |
93 | ||
94 | /* | |
95 | * Trivial lookup routine that always fails. | |
96 | */ | |
97 | fifo_lookup(vp, ndp) | |
98 | struct vnode *vp; | |
99 | struct nameidata *ndp; | |
100 | { | |
101 | ||
102 | ndp->ni_dvp = vp; | |
103 | ndp->ni_vp = NULL; | |
104 | return (ENOTDIR); | |
105 | } | |
106 | ||
107 | /* | |
108 | * Open called to set up a new instance of a fifo or | |
109 | * to find an active instance of a fifo. | |
110 | */ | |
111 | /* ARGSUSED */ | |
112 | fifo_open(vp, mode, cred) | |
113 | register struct vnode *vp; | |
114 | int mode; | |
115 | struct ucred *cred; | |
116 | { | |
117 | register struct fifoinfo *fip; | |
118 | struct socket *rso, *wso; | |
119 | int error; | |
bcc829cc | 120 | static char openstr[] = "fifo"; |
cc6b488e KM |
121 | |
122 | if ((mode & (FREAD|FWRITE)) == (FREAD|FWRITE)) | |
123 | return (EINVAL); | |
124 | if ((fip = vp->v_fifoinfo) == NULL) { | |
125 | MALLOC(fip, struct fifoinfo *, sizeof(*fip), M_VNODE, M_WAITOK); | |
126 | vp->v_fifoinfo = fip; | |
127 | if (error = socreate(AF_UNIX, &rso, SOCK_STREAM, 0)) | |
128 | return (error); | |
129 | fip->fi_readsock = rso; | |
130 | if (error = socreate(AF_UNIX, &wso, SOCK_STREAM, 0)) { | |
131 | (void)soclose(rso); | |
132 | return (error); | |
133 | } | |
134 | fip->fi_writesock = wso; | |
135 | if (error = unp_connect2(wso, rso)) { | |
136 | (void)soclose(wso); | |
137 | (void)soclose(rso); | |
138 | return (error); | |
139 | } | |
140 | wso->so_state |= SS_CANTRCVMORE; | |
141 | rso->so_state |= SS_CANTSENDMORE; | |
142 | } | |
143 | error = 0; | |
144 | if (mode & FREAD) { | |
145 | fip->fi_readers++; | |
146 | if (fip->fi_readers == 1) { | |
147 | fip->fi_writesock->so_state &= ~SS_CANTSENDMORE; | |
148 | if (fip->fi_writers > 0) | |
149 | wakeup((caddr_t)&fip->fi_writers); | |
150 | } | |
151 | if (mode & O_NONBLOCK) | |
152 | return (0); | |
153 | while (fip->fi_writers == 0) | |
bcc829cc MK |
154 | if (error = tsleep((caddr_t)&fip->fi_readers, PSOCK, |
155 | openstr, 0)) | |
cc6b488e KM |
156 | break; |
157 | } else { | |
158 | fip->fi_writers++; | |
159 | if (fip->fi_readers == 0 && (mode & O_NONBLOCK)) { | |
160 | error = ENXIO; | |
161 | } else { | |
162 | if (fip->fi_writers == 1) { | |
163 | fip->fi_readsock->so_state &= ~SS_CANTRCVMORE; | |
164 | if (fip->fi_readers > 0) | |
165 | wakeup((caddr_t)&fip->fi_readers); | |
166 | } | |
167 | while (fip->fi_readers == 0) | |
bcc829cc MK |
168 | if (error = tsleep((caddr_t)&fip->fi_writers, |
169 | PSOCK, openstr, 0)) | |
cc6b488e KM |
170 | break; |
171 | } | |
172 | } | |
173 | if (error) | |
174 | fifo_close(vp, mode, cred); | |
175 | return (error); | |
176 | } | |
177 | ||
178 | /* | |
179 | * Vnode op for read | |
180 | */ | |
181 | /* ARGSUSED */ | |
182 | fifo_read(vp, uio, ioflag, cred) | |
183 | struct vnode *vp; | |
184 | register struct uio *uio; | |
185 | int ioflag; | |
186 | struct ucred *cred; | |
187 | { | |
188 | register struct socket *rso = vp->v_fifoinfo->fi_readsock; | |
189 | int error, startresid; | |
190 | ||
191 | if (uio->uio_rw != UIO_READ) | |
192 | panic("fifo_read mode"); | |
193 | if (uio->uio_resid == 0) | |
194 | return (0); | |
195 | if (ioflag & IO_NDELAY) | |
196 | rso->so_state |= SS_NBIO; | |
197 | startresid = uio->uio_resid; | |
198 | VOP_UNLOCK(vp); | |
199 | error = soreceive(rso, (struct mbuf **)0, uio, (int *)0, | |
200 | (struct mbuf **)0, (struct mbuf **)0); | |
201 | VOP_LOCK(vp); | |
202 | /* | |
203 | * Clear EOF indication after first such return. | |
204 | */ | |
205 | if (uio->uio_resid == startresid) | |
206 | rso->so_state &= ~SS_CANTRCVMORE; | |
207 | if (ioflag & IO_NDELAY) | |
208 | rso->so_state &= ~SS_NBIO; | |
209 | return (error); | |
210 | } | |
211 | ||
212 | /* | |
213 | * Vnode op for write | |
214 | */ | |
215 | /* ARGSUSED */ | |
216 | fifo_write(vp, uio, ioflag, cred) | |
217 | struct vnode *vp; | |
218 | register struct uio *uio; | |
219 | int ioflag; | |
220 | struct ucred *cred; | |
221 | { | |
222 | struct socket *wso = vp->v_fifoinfo->fi_writesock; | |
223 | int error; | |
224 | ||
225 | if (uio->uio_rw != UIO_WRITE) | |
226 | panic("fifo_write mode"); | |
227 | if (ioflag & IO_NDELAY) | |
228 | wso->so_state |= SS_NBIO; | |
229 | VOP_UNLOCK(vp); | |
230 | error = sosend(wso, (struct mbuf *)0, uio, 0, (struct mbuf *)0); | |
231 | VOP_LOCK(vp); | |
232 | if (ioflag & IO_NDELAY) | |
233 | wso->so_state &= ~SS_NBIO; | |
234 | return (error); | |
235 | } | |
236 | ||
237 | /* | |
238 | * Device ioctl operation. | |
239 | */ | |
240 | /* ARGSUSED */ | |
241 | fifo_ioctl(vp, com, data, fflag, cred) | |
242 | struct vnode *vp; | |
243 | int com; | |
244 | caddr_t data; | |
245 | int fflag; | |
246 | struct ucred *cred; | |
247 | { | |
248 | struct file filetmp; | |
249 | int error; | |
250 | ||
251 | if (com == FIONBIO) | |
252 | return (0); | |
253 | if (fflag & FREAD) | |
254 | filetmp.f_data = (caddr_t)vp->v_fifoinfo->fi_readsock; | |
255 | else | |
256 | filetmp.f_data = (caddr_t)vp->v_fifoinfo->fi_writesock; | |
257 | return (soo_ioctl(&filetmp, com, data)); | |
258 | } | |
259 | ||
260 | /* ARGSUSED */ | |
261 | fifo_select(vp, which, fflag, cred) | |
262 | struct vnode *vp; | |
263 | int which, fflag; | |
264 | struct ucred *cred; | |
265 | { | |
266 | struct file filetmp; | |
267 | int error; | |
268 | ||
269 | if (fflag & FREAD) | |
270 | filetmp.f_data = (caddr_t)vp->v_fifoinfo->fi_readsock; | |
271 | else | |
272 | filetmp.f_data = (caddr_t)vp->v_fifoinfo->fi_writesock; | |
273 | return (soo_select(&filetmp, which)); | |
274 | } | |
275 | ||
276 | /* | |
277 | * This is a noop, simply returning what one has been given. | |
278 | */ | |
279 | fifo_bmap(vp, bn, vpp, bnp) | |
280 | struct vnode *vp; | |
281 | daddr_t bn; | |
282 | struct vnode **vpp; | |
283 | daddr_t *bnp; | |
284 | { | |
285 | ||
286 | if (vpp != NULL) | |
287 | *vpp = vp; | |
288 | if (bnp != NULL) | |
289 | *bnp = bn; | |
290 | return (0); | |
291 | } | |
292 | ||
293 | /* | |
294 | * At the moment we do not do any locking. | |
295 | */ | |
296 | /* ARGSUSED */ | |
297 | fifo_lock(vp) | |
298 | struct vnode *vp; | |
299 | { | |
300 | ||
301 | return (0); | |
302 | } | |
303 | ||
304 | /* ARGSUSED */ | |
305 | fifo_unlock(vp) | |
306 | struct vnode *vp; | |
307 | { | |
308 | ||
309 | return (0); | |
310 | } | |
311 | ||
312 | /* | |
313 | * Device close routine | |
314 | */ | |
315 | /* ARGSUSED */ | |
316 | fifo_close(vp, fflag, cred) | |
317 | register struct vnode *vp; | |
318 | int fflag; | |
319 | struct ucred *cred; | |
320 | { | |
321 | register struct fifoinfo *fip = vp->v_fifoinfo; | |
322 | int error1, error2; | |
323 | ||
324 | if (fflag & FWRITE) { | |
325 | fip->fi_writers--; | |
326 | if (fip->fi_writers == 0) | |
327 | socantrcvmore(fip->fi_readsock); | |
328 | } else { | |
329 | fip->fi_readers--; | |
330 | if (fip->fi_readers == 0) | |
331 | socantsendmore(fip->fi_writesock); | |
332 | } | |
333 | if (vp->v_usecount > 1) | |
334 | return (0); | |
335 | error1 = soclose(fip->fi_readsock); | |
336 | error2 = soclose(fip->fi_writesock); | |
337 | FREE(fip, M_VNODE); | |
338 | vp->v_fifoinfo = NULL; | |
339 | if (error1) | |
340 | return (error1); | |
341 | return (error2); | |
342 | } | |
343 | ||
344 | /* | |
345 | * Print out the contents of a fifo vnode. | |
346 | */ | |
347 | fifo_print(vp) | |
348 | struct vnode *vp; | |
349 | { | |
350 | ||
351 | printf("tag VT_NON"); | |
352 | fifo_printinfo(vp); | |
353 | printf("\n"); | |
354 | } | |
355 | ||
356 | /* | |
357 | * Print out internal contents of a fifo vnode. | |
358 | */ | |
359 | fifo_printinfo(vp) | |
360 | struct vnode *vp; | |
361 | { | |
362 | register struct fifoinfo *fip = vp->v_fifoinfo; | |
363 | ||
364 | printf(", fifo with %d readers and %d writers", | |
365 | fip->fi_readers, fip->fi_writers); | |
366 | } | |
367 | ||
368 | /* | |
369 | * Fifo failed operation | |
370 | */ | |
371 | fifo_ebadf() | |
372 | { | |
373 | ||
374 | return (EBADF); | |
375 | } | |
376 | ||
377 | /* | |
378 | * Fifo bad operation | |
379 | */ | |
380 | fifo_badop() | |
381 | { | |
382 | ||
383 | panic("fifo_badop called"); | |
384 | /* NOTREACHED */ | |
385 | } | |
386 | ||
387 | /* | |
388 | * Fifo null operation | |
389 | */ | |
390 | fifo_nullop() | |
391 | { | |
392 | ||
393 | return (0); | |
394 | } |