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1.1 root 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, with or without
6: * modification, are permitted provided that the following conditions
7: * are met:
8: * 1. Redistributions of source code must retain the above copyright
9: * notice, this list of conditions and the following disclaimer.
10: * 2. Redistributions in binary form must reproduce the above copyright
11: * notice, this list of conditions and the following disclaimer in the
12: * documentation and/or other materials provided with the distribution.
13: * 3. All advertising materials mentioning features or use of this software
14: * must display the following acknowledgement:
15: * This product includes software developed by the University of
16: * California, Berkeley and its contributors.
17: * 4. Neither the name of the University nor the names of its contributors
18: * may be used to endorse or promote products derived from this software
19: * without specific prior written permission.
20: *
21: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31: * SUCH DAMAGE.
32: *
1.1.1.3 ! root 33: * from: @(#)fifo_vnops.c 7.7 (Berkeley) 4/15/91
! 34: * fifo_vnops.c,v 1.5 1993/06/27 06:01:28 andrew Exp
1.1 root 35: */
36:
37: #include "param.h"
38: #include "time.h"
39: #include "namei.h"
40: #include "vnode.h"
41: #include "socket.h"
42: #include "socketvar.h"
1.1.1.3 ! root 43: #include "un.h"
1.1 root 44: #include "stat.h"
45: #include "systm.h"
46: #include "ioctl.h"
47: #include "file.h"
48: #include "fifo.h"
49: #include "errno.h"
50: #include "malloc.h"
51:
52: /*
53: * This structure is associated with the FIFO vnode and stores
54: * the state associated with the FIFO.
55: */
56: struct fifoinfo {
57: struct socket *fi_readsock;
58: struct socket *fi_writesock;
59: long fi_readers;
60: long fi_writers;
61: };
62:
63: struct vnodeops fifo_vnodeops = {
64: fifo_lookup, /* lookup */
65: fifo_create, /* create */
66: fifo_mknod, /* mknod */
67: fifo_open, /* open */
68: fifo_close, /* close */
69: fifo_access, /* access */
70: fifo_getattr, /* getattr */
71: fifo_setattr, /* setattr */
72: fifo_read, /* read */
73: fifo_write, /* write */
74: fifo_ioctl, /* ioctl */
75: fifo_select, /* select */
76: fifo_mmap, /* mmap */
77: fifo_fsync, /* fsync */
78: fifo_seek, /* seek */
79: fifo_remove, /* remove */
80: fifo_link, /* link */
81: fifo_rename, /* rename */
82: fifo_mkdir, /* mkdir */
83: fifo_rmdir, /* rmdir */
84: fifo_symlink, /* symlink */
85: fifo_readdir, /* readdir */
86: fifo_readlink, /* readlink */
87: fifo_abortop, /* abortop */
88: fifo_inactive, /* inactive */
89: fifo_reclaim, /* reclaim */
90: fifo_lock, /* lock */
91: fifo_unlock, /* unlock */
92: fifo_bmap, /* bmap */
93: fifo_strategy, /* strategy */
94: fifo_print, /* print */
95: fifo_islocked, /* islocked */
96: fifo_advlock, /* advlock */
97: };
98:
99: /*
100: * Trivial lookup routine that always fails.
101: */
102: /* ARGSUSED */
1.1.1.3 ! root 103: int
1.1 root 104: fifo_lookup(vp, ndp, p)
105: struct vnode *vp;
106: struct nameidata *ndp;
107: struct proc *p;
108: {
109:
110: ndp->ni_dvp = vp;
111: ndp->ni_vp = NULL;
112: return (ENOTDIR);
113: }
114:
115: /*
116: * Open called to set up a new instance of a fifo or
117: * to find an active instance of a fifo.
118: */
119: /* ARGSUSED */
1.1.1.3 ! root 120: int
1.1 root 121: fifo_open(vp, mode, cred, p)
122: register struct vnode *vp;
123: int mode;
124: struct ucred *cred;
125: struct proc *p;
126: {
127: register struct fifoinfo *fip;
128: struct socket *rso, *wso;
129: int error;
130: static char openstr[] = "fifo";
131:
132: if ((mode & (FREAD|FWRITE)) == (FREAD|FWRITE))
133: return (EINVAL);
134: if ((fip = vp->v_fifoinfo) == NULL) {
135: MALLOC(fip, struct fifoinfo *, sizeof(*fip), M_VNODE, M_WAITOK);
136: vp->v_fifoinfo = fip;
1.1.1.2 root 137: fip->fi_readers=0;
138: fip->fi_writers=0;
1.1 root 139: if (error = socreate(AF_UNIX, &rso, SOCK_STREAM, 0)) {
140: free(fip, M_VNODE);
141: vp->v_fifoinfo = NULL;
142: return (error);
143: }
144: fip->fi_readsock = rso;
145: if (error = socreate(AF_UNIX, &wso, SOCK_STREAM, 0)) {
146: (void)soclose(rso);
147: free(fip, M_VNODE);
148: vp->v_fifoinfo = NULL;
149: return (error);
150: }
151: fip->fi_writesock = wso;
152: if (error = unp_connect2(wso, rso)) {
153: (void)soclose(wso);
154: (void)soclose(rso);
155: free(fip, M_VNODE);
156: vp->v_fifoinfo = NULL;
157: return (error);
158: }
159: wso->so_state |= SS_CANTRCVMORE;
160: rso->so_state |= SS_CANTSENDMORE;
161: }
162: error = 0;
163: if (mode & FREAD) {
164: fip->fi_readers++;
165: if (fip->fi_readers == 1) {
166: fip->fi_writesock->so_state &= ~SS_CANTSENDMORE;
167: if (fip->fi_writers > 0)
168: wakeup((caddr_t)&fip->fi_writers);
169: }
170: if (mode & O_NONBLOCK)
171: return (0);
1.1.1.2 root 172: while (fip->fi_writers == 0) {
173: VOP_UNLOCK(vp);
1.1.1.3 ! root 174: error = tsleep((caddr_t)&fip->fi_readers, PSOCK|PCATCH,
1.1.1.2 root 175: openstr, 0);
176: VOP_LOCK(vp);
177: if(error)
1.1 root 178: break;
1.1.1.2 root 179: }
1.1 root 180: } else {
181: fip->fi_writers++;
182: if (fip->fi_readers == 0 && (mode & O_NONBLOCK)) {
183: error = ENXIO;
184: } else {
185: if (fip->fi_writers == 1) {
186: fip->fi_readsock->so_state &= ~SS_CANTRCVMORE;
187: if (fip->fi_readers > 0)
188: wakeup((caddr_t)&fip->fi_readers);
189: }
1.1.1.2 root 190: while (fip->fi_readers == 0) {
191: VOP_UNLOCK(vp);
192: error = tsleep((caddr_t)&fip->fi_writers,
1.1.1.3 ! root 193: PSOCK|PCATCH, openstr, 0);
1.1.1.2 root 194: VOP_LOCK(vp);
195: if(error)
1.1 root 196: break;
1.1.1.2 root 197: }
1.1 root 198: }
199: }
200: if (error)
201: fifo_close(vp, mode, cred, p);
202: return (error);
203: }
204:
205: /*
206: * Vnode op for read
207: */
208: /* ARGSUSED */
1.1.1.3 ! root 209: int
1.1 root 210: fifo_read(vp, uio, ioflag, cred)
211: struct vnode *vp;
212: register struct uio *uio;
213: int ioflag;
214: struct ucred *cred;
215: {
216: register struct socket *rso = vp->v_fifoinfo->fi_readsock;
217: int error, startresid;
218:
219: #ifdef DIAGNOSTIC
220: if (uio->uio_rw != UIO_READ)
221: panic("fifo_read mode");
222: #endif
223: if (uio->uio_resid == 0)
224: return (0);
225: if (ioflag & IO_NDELAY)
226: rso->so_state |= SS_NBIO;
227: startresid = uio->uio_resid;
228: VOP_UNLOCK(vp);
1.1.1.3 ! root 229: error = soreceive(rso, (struct mbuf **)0, uio, (struct mbuf **)0,
! 230: (struct mbuf **)0, (int *)0);
1.1 root 231: VOP_LOCK(vp);
232: /*
233: * Clear EOF indication after first such return.
234: */
235: if (uio->uio_resid == startresid)
236: rso->so_state &= ~SS_CANTRCVMORE;
237: if (ioflag & IO_NDELAY)
238: rso->so_state &= ~SS_NBIO;
239: return (error);
240: }
241:
242: /*
243: * Vnode op for write
244: */
245: /* ARGSUSED */
1.1.1.3 ! root 246: int
1.1 root 247: fifo_write(vp, uio, ioflag, cred)
248: struct vnode *vp;
249: register struct uio *uio;
250: int ioflag;
251: struct ucred *cred;
252: {
253: struct socket *wso = vp->v_fifoinfo->fi_writesock;
254: int error;
255:
256: #ifdef DIAGNOSTIC
257: if (uio->uio_rw != UIO_WRITE)
258: panic("fifo_write mode");
259: #endif
260: if (ioflag & IO_NDELAY)
261: wso->so_state |= SS_NBIO;
262: VOP_UNLOCK(vp);
1.1.1.3 ! root 263: error = sosend(wso, (struct mbuf *)0, uio, 0, (struct mbuf *)0, 0);
1.1 root 264: VOP_LOCK(vp);
265: if (ioflag & IO_NDELAY)
266: wso->so_state &= ~SS_NBIO;
267: return (error);
268: }
269:
270: /*
271: * Device ioctl operation.
272: */
273: /* ARGSUSED */
1.1.1.3 ! root 274: int
1.1 root 275: fifo_ioctl(vp, com, data, fflag, cred, p)
276: struct vnode *vp;
277: int com;
278: caddr_t data;
279: int fflag;
280: struct ucred *cred;
281: struct proc *p;
282: {
283: struct file filetmp;
284:
285: if (com == FIONBIO)
286: return (0);
287: if (fflag & FREAD)
288: filetmp.f_data = (caddr_t)vp->v_fifoinfo->fi_readsock;
289: else
290: filetmp.f_data = (caddr_t)vp->v_fifoinfo->fi_writesock;
291: return (soo_ioctl(&filetmp, com, data, p));
292: }
293:
294: /* ARGSUSED */
1.1.1.3 ! root 295: int
1.1 root 296: fifo_select(vp, which, fflag, cred, p)
297: struct vnode *vp;
298: int which, fflag;
299: struct ucred *cred;
300: struct proc *p;
301: {
302: struct file filetmp;
303:
304: if (fflag & FREAD)
305: filetmp.f_data = (caddr_t)vp->v_fifoinfo->fi_readsock;
306: else
307: filetmp.f_data = (caddr_t)vp->v_fifoinfo->fi_writesock;
308: return (soo_select(&filetmp, which, p));
309: }
310:
311: /*
312: * This is a noop, simply returning what one has been given.
313: */
1.1.1.3 ! root 314: int
1.1 root 315: fifo_bmap(vp, bn, vpp, bnp)
316: struct vnode *vp;
317: daddr_t bn;
318: struct vnode **vpp;
319: daddr_t *bnp;
320: {
321:
322: if (vpp != NULL)
323: *vpp = vp;
324: if (bnp != NULL)
325: *bnp = bn;
326: return (0);
327: }
328:
329: /*
330: * At the moment we do not do any locking.
331: */
332: /* ARGSUSED */
1.1.1.3 ! root 333: int
1.1 root 334: fifo_lock(vp)
335: struct vnode *vp;
336: {
337:
338: return (0);
339: }
340:
341: /* ARGSUSED */
1.1.1.3 ! root 342: int
1.1 root 343: fifo_unlock(vp)
344: struct vnode *vp;
345: {
346:
347: return (0);
348: }
349:
350: /*
351: * Device close routine
352: */
353: /* ARGSUSED */
1.1.1.3 ! root 354: int
1.1 root 355: fifo_close(vp, fflag, cred, p)
356: register struct vnode *vp;
357: int fflag;
358: struct ucred *cred;
359: struct proc *p;
360: {
361: register struct fifoinfo *fip = vp->v_fifoinfo;
362: int error1, error2;
363:
364: if (fflag & FWRITE) {
365: fip->fi_writers--;
366: if (fip->fi_writers == 0)
367: socantrcvmore(fip->fi_readsock);
368: } else {
369: fip->fi_readers--;
370: if (fip->fi_readers == 0)
371: socantsendmore(fip->fi_writesock);
372: }
373: if (vp->v_usecount > 1)
374: return (0);
375: error1 = soclose(fip->fi_readsock);
376: error2 = soclose(fip->fi_writesock);
377: FREE(fip, M_VNODE);
378: vp->v_fifoinfo = NULL;
379: if (error1)
380: return (error1);
381: return (error2);
382: }
383:
384: /*
385: * Print out the contents of a fifo vnode.
386: */
1.1.1.3 ! root 387: void
1.1 root 388: fifo_print(vp)
389: struct vnode *vp;
390: {
391:
392: printf("tag VT_NON");
393: fifo_printinfo(vp);
394: printf("\n");
395: }
396:
397: /*
398: * Print out internal contents of a fifo vnode.
399: */
1.1.1.3 ! root 400: void
1.1 root 401: fifo_printinfo(vp)
402: struct vnode *vp;
403: {
404: register struct fifoinfo *fip = vp->v_fifoinfo;
405:
406: printf(", fifo with %d readers and %d writers",
407: fip->fi_readers, fip->fi_writers);
408: }
409:
410: /*
411: * Fifo failed operation
412: */
1.1.1.3 ! root 413: int
1.1 root 414: fifo_ebadf()
415: {
416:
417: return (EBADF);
418: }
419:
420: /*
421: * Fifo advisory byte-level locks.
422: */
423: /* ARGSUSED */
1.1.1.3 ! root 424: int
1.1 root 425: fifo_advlock(vp, id, op, fl, flags)
426: struct vnode *vp;
427: caddr_t id;
428: int op;
429: struct flock *fl;
430: int flags;
431: {
432:
433: return (EOPNOTSUPP);
434: }
435:
436: /*
437: * Fifo bad operation
438: */
1.1.1.3 ! root 439: int
1.1 root 440: fifo_badop()
441: {
442:
443: panic("fifo_badop called");
444: /* NOTREACHED */
445: }
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