Annotation of src/sys/miscfs/fifofs/fifo_vnops.c, Revision 1.53
1.53 ! yamt 1: /* $NetBSD: fifo_vnops.c,v 1.52 2005/08/30 20:08:01 xtraeme Exp $ */
1.9 cgd 2:
1.1 cgd 3: /*
1.25 fvdl 4: * Copyright (c) 1990, 1993, 1995
1.8 mycroft 5: * The Regents of the University of California. All rights reserved.
1.1 cgd 6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
1.42 agc 15: * 3. Neither the name of the University nor the names of its contributors
1.1 cgd 16: * may be used to endorse or promote products derived from this software
17: * without specific prior written permission.
18: *
19: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29: * SUCH DAMAGE.
30: *
1.25 fvdl 31: * @(#)fifo_vnops.c 8.10 (Berkeley) 5/27/95
1.1 cgd 32: */
1.32 lukem 33:
34: #include <sys/cdefs.h>
1.53 ! yamt 35: __KERNEL_RCSID(0, "$NetBSD: fifo_vnops.c,v 1.52 2005/08/30 20:08:01 xtraeme Exp $");
1.1 cgd 36:
1.6 mycroft 37: #include <sys/param.h>
1.25 fvdl 38: #include <sys/systm.h>
1.8 mycroft 39: #include <sys/proc.h>
1.6 mycroft 40: #include <sys/time.h>
41: #include <sys/namei.h>
42: #include <sys/vnode.h>
43: #include <sys/socket.h>
1.45 matt 44: #include <sys/protosw.h>
1.6 mycroft 45: #include <sys/socketvar.h>
46: #include <sys/stat.h>
47: #include <sys/ioctl.h>
48: #include <sys/file.h>
49: #include <sys/errno.h>
50: #include <sys/malloc.h>
1.17 christos 51: #include <sys/un.h>
1.20 mycroft 52: #include <sys/poll.h>
1.36 jdolecek 53: #include <sys/event.h>
1.19 mycroft 54:
1.6 mycroft 55: #include <miscfs/fifofs/fifo.h>
1.19 mycroft 56: #include <miscfs/genfs/genfs.h>
1.1 cgd 57:
58: /*
59: * This structure is associated with the FIFO vnode and stores
60: * the state associated with the FIFO.
61: */
62: struct fifoinfo {
63: struct socket *fi_readsock;
64: struct socket *fi_writesock;
65: long fi_readers;
66: long fi_writers;
67: };
68:
1.52 xtraeme 69: int (**fifo_vnodeop_p)(void *);
1.29 jdolecek 70: const struct vnodeopv_entry_desc fifo_vnodeop_entries[] = {
1.8 mycroft 71: { &vop_default_desc, vn_default_error },
72: { &vop_lookup_desc, fifo_lookup }, /* lookup */
73: { &vop_create_desc, fifo_create }, /* create */
74: { &vop_mknod_desc, fifo_mknod }, /* mknod */
75: { &vop_open_desc, fifo_open }, /* open */
76: { &vop_close_desc, fifo_close }, /* close */
77: { &vop_access_desc, fifo_access }, /* access */
78: { &vop_getattr_desc, fifo_getattr }, /* getattr */
79: { &vop_setattr_desc, fifo_setattr }, /* setattr */
80: { &vop_read_desc, fifo_read }, /* read */
81: { &vop_write_desc, fifo_write }, /* write */
1.13 mycroft 82: { &vop_lease_desc, fifo_lease_check }, /* lease */
1.8 mycroft 83: { &vop_ioctl_desc, fifo_ioctl }, /* ioctl */
1.20 mycroft 84: { &vop_poll_desc, fifo_poll }, /* poll */
1.36 jdolecek 85: { &vop_kqfilter_desc, fifo_kqfilter }, /* kqfilter */
1.25 fvdl 86: { &vop_revoke_desc, fifo_revoke }, /* revoke */
1.8 mycroft 87: { &vop_mmap_desc, fifo_mmap }, /* mmap */
88: { &vop_fsync_desc, fifo_fsync }, /* fsync */
89: { &vop_seek_desc, fifo_seek }, /* seek */
90: { &vop_remove_desc, fifo_remove }, /* remove */
91: { &vop_link_desc, fifo_link }, /* link */
92: { &vop_rename_desc, fifo_rename }, /* rename */
93: { &vop_mkdir_desc, fifo_mkdir }, /* mkdir */
94: { &vop_rmdir_desc, fifo_rmdir }, /* rmdir */
95: { &vop_symlink_desc, fifo_symlink }, /* symlink */
96: { &vop_readdir_desc, fifo_readdir }, /* readdir */
97: { &vop_readlink_desc, fifo_readlink }, /* readlink */
98: { &vop_abortop_desc, fifo_abortop }, /* abortop */
99: { &vop_inactive_desc, fifo_inactive }, /* inactive */
100: { &vop_reclaim_desc, fifo_reclaim }, /* reclaim */
101: { &vop_lock_desc, fifo_lock }, /* lock */
102: { &vop_unlock_desc, fifo_unlock }, /* unlock */
103: { &vop_bmap_desc, fifo_bmap }, /* bmap */
104: { &vop_strategy_desc, fifo_strategy }, /* strategy */
105: { &vop_print_desc, fifo_print }, /* print */
106: { &vop_islocked_desc, fifo_islocked }, /* islocked */
107: { &vop_pathconf_desc, fifo_pathconf }, /* pathconf */
108: { &vop_advlock_desc, fifo_advlock }, /* advlock */
109: { &vop_bwrite_desc, fifo_bwrite }, /* bwrite */
1.31 sommerfe 110: { &vop_putpages_desc, fifo_putpages }, /* putpages */
1.52 xtraeme 111: { (struct vnodeop_desc*)NULL, (int(*)(void *))NULL }
1.1 cgd 112: };
1.29 jdolecek 113: const struct vnodeopv_desc fifo_vnodeop_opv_desc =
1.8 mycroft 114: { &fifo_vnodeop_p, fifo_vnodeop_entries };
1.1 cgd 115:
116: /*
117: * Trivial lookup routine that always fails.
118: */
119: /* ARGSUSED */
1.17 christos 120: int
1.30 lukem 121: fifo_lookup(void *v)
1.17 christos 122: {
1.8 mycroft 123: struct vop_lookup_args /* {
1.30 lukem 124: struct vnode *a_dvp;
125: struct vnode **a_vpp;
126: struct componentname *a_cnp;
1.17 christos 127: } */ *ap = v;
1.51 perry 128:
1.8 mycroft 129: *ap->a_vpp = NULL;
1.1 cgd 130: return (ENOTDIR);
131: }
132:
133: /*
134: * Open called to set up a new instance of a fifo or
135: * to find an active instance of a fifo.
136: */
137: /* ARGSUSED */
1.17 christos 138: int
1.30 lukem 139: fifo_open(void *v)
1.17 christos 140: {
1.8 mycroft 141: struct vop_open_args /* {
1.30 lukem 142: struct vnode *a_vp;
143: int a_mode;
144: struct ucred *a_cred;
1.41 fvdl 145: struct proc *a_p;
1.17 christos 146: } */ *ap = v;
1.30 lukem 147: struct vnode *vp;
148: struct fifoinfo *fip;
149: struct proc *p;
150: struct socket *rso, *wso;
151: int error;
1.1 cgd 152:
1.30 lukem 153: vp = ap->a_vp;
1.41 fvdl 154: p = ap->a_p;
1.30 lukem 155:
1.1 cgd 156: if ((fip = vp->v_fifoinfo) == NULL) {
157: MALLOC(fip, struct fifoinfo *, sizeof(*fip), M_VNODE, M_WAITOK);
158: vp->v_fifoinfo = fip;
1.49 jonathan 159: error = socreate(AF_LOCAL, &rso, SOCK_STREAM, 0, p);
160: if (error != 0) {
1.1 cgd 161: free(fip, M_VNODE);
162: vp->v_fifoinfo = NULL;
163: return (error);
164: }
165: fip->fi_readsock = rso;
1.49 jonathan 166: error = socreate(AF_LOCAL, &wso, SOCK_STREAM, 0, p);
167: if (error != 0) {
1.1 cgd 168: (void)soclose(rso);
169: free(fip, M_VNODE);
170: vp->v_fifoinfo = NULL;
171: return (error);
172: }
173: fip->fi_writesock = wso;
1.45 matt 174: if ((error = unp_connect2(wso, rso, PRU_CONNECT2)) != 0) {
1.1 cgd 175: (void)soclose(wso);
176: (void)soclose(rso);
177: free(fip, M_VNODE);
178: vp->v_fifoinfo = NULL;
179: return (error);
180: }
1.8 mycroft 181: fip->fi_readers = fip->fi_writers = 0;
1.1 cgd 182: wso->so_state |= SS_CANTRCVMORE;
183: rso->so_state |= SS_CANTSENDMORE;
184: }
1.8 mycroft 185: if (ap->a_mode & FREAD) {
1.16 mycroft 186: if (fip->fi_readers++ == 0) {
1.1 cgd 187: fip->fi_writesock->so_state &= ~SS_CANTSENDMORE;
188: if (fip->fi_writers > 0)
1.47 jrf 189: wakeup(&fip->fi_writers);
1.1 cgd 190: }
1.16 mycroft 191: }
192: if (ap->a_mode & FWRITE) {
193: if (fip->fi_writers++ == 0) {
194: fip->fi_readsock->so_state &= ~SS_CANTRCVMORE;
195: if (fip->fi_readers > 0)
1.47 jrf 196: wakeup(&fip->fi_readers);
1.2 cgd 197: }
1.16 mycroft 198: }
199: if (ap->a_mode & FREAD) {
200: if (ap->a_mode & O_NONBLOCK) {
1.1 cgd 201: } else {
1.39 martin 202: while (!soreadable(fip->fi_readsock) && fip->fi_writers == 0) {
1.25 fvdl 203: VOP_UNLOCK(vp, 0);
1.47 jrf 204: error = tsleep(&fip->fi_readers,
1.38 jdolecek 205: PCATCH | PSOCK, "fifor", 0);
1.25 fvdl 206: vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1.16 mycroft 207: if (error)
208: goto bad;
1.1 cgd 209: }
1.16 mycroft 210: }
211: }
212: if (ap->a_mode & FWRITE) {
213: if (ap->a_mode & O_NONBLOCK) {
214: if (fip->fi_readers == 0) {
215: error = ENXIO;
216: goto bad;
217: }
218: } else {
1.2 cgd 219: while (fip->fi_readers == 0) {
1.25 fvdl 220: VOP_UNLOCK(vp, 0);
1.47 jrf 221: error = tsleep(&fip->fi_writers,
1.38 jdolecek 222: PCATCH | PSOCK, "fifow", 0);
1.25 fvdl 223: vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1.8 mycroft 224: if (error)
1.16 mycroft 225: goto bad;
1.2 cgd 226: }
1.1 cgd 227: }
228: }
1.16 mycroft 229: return (0);
1.30 lukem 230: bad:
1.41 fvdl 231: VOP_CLOSE(vp, ap->a_mode, ap->a_cred, p);
1.1 cgd 232: return (error);
233: }
234:
235: /*
236: * Vnode op for read
237: */
238: /* ARGSUSED */
1.17 christos 239: int
1.30 lukem 240: fifo_read(void *v)
1.17 christos 241: {
1.8 mycroft 242: struct vop_read_args /* {
1.30 lukem 243: struct vnode *a_vp;
244: struct uio *a_uio;
245: int a_ioflag;
246: struct ucred *a_cred;
1.17 christos 247: } */ *ap = v;
1.30 lukem 248: struct uio *uio;
249: struct socket *rso;
1.35 thorpej 250: int error;
251: size_t startresid;
1.1 cgd 252:
1.30 lukem 253: uio = ap->a_uio;
254: rso = ap->a_vp->v_fifoinfo->fi_readsock;
1.1 cgd 255: #ifdef DIAGNOSTIC
256: if (uio->uio_rw != UIO_READ)
257: panic("fifo_read mode");
258: #endif
259: if (uio->uio_resid == 0)
260: return (0);
1.8 mycroft 261: if (ap->a_ioflag & IO_NDELAY)
1.1 cgd 262: rso->so_state |= SS_NBIO;
263: startresid = uio->uio_resid;
1.25 fvdl 264: VOP_UNLOCK(ap->a_vp, 0);
1.27 matt 265: error = (*rso->so_receive)(rso, (struct mbuf **)0, uio,
266: (struct mbuf **)0, (struct mbuf **)0, (int *)0);
1.25 fvdl 267: vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY);
1.1 cgd 268: /*
269: * Clear EOF indication after first such return.
270: */
271: if (uio->uio_resid == startresid)
272: rso->so_state &= ~SS_CANTRCVMORE;
1.23 kleink 273: if (ap->a_ioflag & IO_NDELAY) {
1.1 cgd 274: rso->so_state &= ~SS_NBIO;
1.23 kleink 275: if (error == EWOULDBLOCK &&
276: ap->a_vp->v_fifoinfo->fi_writers == 0)
277: error = 0;
278: }
1.1 cgd 279: return (error);
280: }
281:
282: /*
283: * Vnode op for write
284: */
285: /* ARGSUSED */
1.17 christos 286: int
1.30 lukem 287: fifo_write(void *v)
1.17 christos 288: {
1.8 mycroft 289: struct vop_write_args /* {
1.30 lukem 290: struct vnode *a_vp;
291: struct uio *a_uio;
292: int a_ioflag;
293: struct ucred *a_cred;
1.17 christos 294: } */ *ap = v;
1.30 lukem 295: struct socket *wso;
296: int error;
1.1 cgd 297:
1.30 lukem 298: wso = ap->a_vp->v_fifoinfo->fi_writesock;
1.1 cgd 299: #ifdef DIAGNOSTIC
1.8 mycroft 300: if (ap->a_uio->uio_rw != UIO_WRITE)
1.1 cgd 301: panic("fifo_write mode");
302: #endif
1.8 mycroft 303: if (ap->a_ioflag & IO_NDELAY)
1.1 cgd 304: wso->so_state |= SS_NBIO;
1.25 fvdl 305: VOP_UNLOCK(ap->a_vp, 0);
1.27 matt 306: error = (*wso->so_send)(wso, (struct mbuf *)0, ap->a_uio, 0,
1.49 jonathan 307: (struct mbuf *)0, 0, curproc /*XXX*/);
1.25 fvdl 308: vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY);
1.8 mycroft 309: if (ap->a_ioflag & IO_NDELAY)
1.1 cgd 310: wso->so_state &= ~SS_NBIO;
311: return (error);
312: }
313:
314: /*
315: * Device ioctl operation.
316: */
317: /* ARGSUSED */
1.17 christos 318: int
1.30 lukem 319: fifo_ioctl(void *v)
1.17 christos 320: {
1.8 mycroft 321: struct vop_ioctl_args /* {
1.30 lukem 322: struct vnode *a_vp;
323: u_long a_command;
1.48 jrf 324: void *a_data;
1.30 lukem 325: int a_fflag;
326: struct ucred *a_cred;
1.41 fvdl 327: struct proc *a_p;
1.17 christos 328: } */ *ap = v;
1.30 lukem 329: struct file filetmp;
330: int error;
1.1 cgd 331:
1.8 mycroft 332: if (ap->a_command == FIONBIO)
1.1 cgd 333: return (0);
1.16 mycroft 334: if (ap->a_fflag & FREAD) {
1.48 jrf 335: filetmp.f_data = ap->a_vp->v_fifoinfo->fi_readsock;
1.41 fvdl 336: error = soo_ioctl(&filetmp, ap->a_command, ap->a_data, ap->a_p);
1.16 mycroft 337: if (error)
338: return (error);
339: }
340: if (ap->a_fflag & FWRITE) {
1.48 jrf 341: filetmp.f_data = ap->a_vp->v_fifoinfo->fi_writesock;
1.41 fvdl 342: error = soo_ioctl(&filetmp, ap->a_command, ap->a_data, ap->a_p);
1.16 mycroft 343: if (error)
344: return (error);
345: }
346: return (0);
1.1 cgd 347: }
348:
349: /* ARGSUSED */
1.17 christos 350: int
1.30 lukem 351: fifo_poll(void *v)
1.17 christos 352: {
1.20 mycroft 353: struct vop_poll_args /* {
1.30 lukem 354: struct vnode *a_vp;
355: int a_events;
1.41 fvdl 356: struct proc *a_p;
1.17 christos 357: } */ *ap = v;
1.30 lukem 358: struct file filetmp;
359: int revents;
1.1 cgd 360:
1.30 lukem 361: revents = 0;
1.20 mycroft 362: if (ap->a_events & (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND)) {
1.48 jrf 363: filetmp.f_data = ap->a_vp->v_fifoinfo->fi_readsock;
1.20 mycroft 364: if (filetmp.f_data)
1.41 fvdl 365: revents |= soo_poll(&filetmp, ap->a_events, ap->a_p);
1.16 mycroft 366: }
1.20 mycroft 367: if (ap->a_events & (POLLOUT | POLLWRNORM | POLLWRBAND)) {
1.48 jrf 368: filetmp.f_data = ap->a_vp->v_fifoinfo->fi_writesock;
1.20 mycroft 369: if (filetmp.f_data)
1.41 fvdl 370: revents |= soo_poll(&filetmp, ap->a_events, ap->a_p);
1.16 mycroft 371: }
1.20 mycroft 372:
373: return (revents);
1.1 cgd 374: }
375:
1.25 fvdl 376: int
1.30 lukem 377: fifo_inactive(void *v)
1.25 fvdl 378: {
379: struct vop_inactive_args /* {
1.30 lukem 380: struct vnode *a_vp;
1.41 fvdl 381: struct proc *a_p;
1.25 fvdl 382: } */ *ap = v;
383:
384: VOP_UNLOCK(ap->a_vp, 0);
385: return (0);
386: }
387:
1.1 cgd 388: /*
389: * This is a noop, simply returning what one has been given.
390: */
1.17 christos 391: int
1.30 lukem 392: fifo_bmap(void *v)
1.17 christos 393: {
1.8 mycroft 394: struct vop_bmap_args /* {
1.30 lukem 395: struct vnode *a_vp;
396: daddr_t a_bn;
397: struct vnode **a_vpp;
398: daddr_t *a_bnp;
399: int *a_runp;
1.17 christos 400: } */ *ap = v;
1.1 cgd 401:
1.8 mycroft 402: if (ap->a_vpp != NULL)
403: *ap->a_vpp = ap->a_vp;
404: if (ap->a_bnp != NULL)
405: *ap->a_bnp = ap->a_bn;
1.25 fvdl 406: if (ap->a_runp != NULL)
407: *ap->a_runp = 0;
1.1 cgd 408: return (0);
409: }
410:
411: /*
412: * Device close routine
413: */
414: /* ARGSUSED */
1.17 christos 415: int
1.30 lukem 416: fifo_close(void *v)
1.17 christos 417: {
1.8 mycroft 418: struct vop_close_args /* {
1.30 lukem 419: struct vnode *a_vp;
420: int a_fflag;
421: struct ucred *a_cred;
1.41 fvdl 422: struct proc *a_p;
1.17 christos 423: } */ *ap = v;
1.30 lukem 424: struct vnode *vp;
425: struct fifoinfo *fip;
1.50 mycroft 426: int isrevoke;
1.1 cgd 427:
1.30 lukem 428: vp = ap->a_vp;
429: fip = vp->v_fifoinfo;
1.50 mycroft 430: isrevoke = (ap->a_fflag & (FREAD | FWRITE | FNONBLOCK)) == FNONBLOCK;
431: if (isrevoke) {
432: if (fip->fi_readers != 0) {
433: fip->fi_readers = 0;
434: socantsendmore(fip->fi_writesock);
435: }
436: if (fip->fi_writers != 0) {
437: fip->fi_writers = 0;
438: socantrcvmore(fip->fi_readsock);
439: }
440: } else {
441: if ((ap->a_fflag & FREAD) && --fip->fi_readers == 0)
1.16 mycroft 442: socantsendmore(fip->fi_writesock);
1.50 mycroft 443: if ((ap->a_fflag & FWRITE) && --fip->fi_writers == 0)
1.1 cgd 444: socantrcvmore(fip->fi_readsock);
445: }
1.50 mycroft 446: /* Shut down if all readers and writers are gone. */
447: if ((fip->fi_readers + fip->fi_writers) == 0) {
1.34 chs 448: (void) soclose(fip->fi_readsock);
449: (void) soclose(fip->fi_writesock);
450: FREE(fip, M_VNODE);
451: vp->v_fifoinfo = NULL;
452: }
453: return (0);
1.1 cgd 454: }
455:
456: /*
457: * Print out the contents of a fifo vnode.
458: */
1.17 christos 459: int
1.30 lukem 460: fifo_print(void *v)
1.17 christos 461: {
1.8 mycroft 462: struct vop_print_args /* {
1.30 lukem 463: struct vnode *a_vp;
1.17 christos 464: } */ *ap = v;
1.1 cgd 465:
1.22 christos 466: printf("tag VT_NON");
1.8 mycroft 467: fifo_printinfo(ap->a_vp);
1.22 christos 468: printf("\n");
1.17 christos 469: return 0;
1.1 cgd 470: }
471:
472: /*
473: * Print out internal contents of a fifo vnode.
474: */
1.17 christos 475: void
1.30 lukem 476: fifo_printinfo(struct vnode *vp)
1.1 cgd 477: {
1.30 lukem 478: struct fifoinfo *fip;
1.1 cgd 479:
1.30 lukem 480: fip = vp->v_fifoinfo;
1.22 christos 481: printf(", fifo with %ld readers and %ld writers",
1.21 christos 482: fip->fi_readers, fip->fi_writers);
1.1 cgd 483: }
484:
485: /*
1.8 mycroft 486: * Return POSIX pathconf information applicable to fifo's.
487: */
1.17 christos 488: int
1.30 lukem 489: fifo_pathconf(void *v)
1.17 christos 490: {
1.8 mycroft 491: struct vop_pathconf_args /* {
1.30 lukem 492: struct vnode *a_vp;
493: int a_name;
494: register_t *a_retval;
1.17 christos 495: } */ *ap = v;
1.8 mycroft 496:
497: switch (ap->a_name) {
498: case _PC_LINK_MAX:
499: *ap->a_retval = LINK_MAX;
500: return (0);
501: case _PC_PIPE_BUF:
502: *ap->a_retval = PIPE_BUF;
503: return (0);
504: case _PC_CHOWN_RESTRICTED:
1.26 kleink 505: *ap->a_retval = 1;
506: return (0);
507: case _PC_SYNC_IO:
1.8 mycroft 508: *ap->a_retval = 1;
509: return (0);
510: default:
511: return (EINVAL);
512: }
1.1 cgd 513: /* NOTREACHED */
1.36 jdolecek 514: }
515:
516: static void
517: filt_fifordetach(struct knote *kn)
518: {
519: struct socket *so;
520:
521: so = (struct socket *)kn->kn_hook;
1.37 christos 522: SLIST_REMOVE(&so->so_rcv.sb_sel.sel_klist, kn, knote, kn_selnext);
523: if (SLIST_EMPTY(&so->so_rcv.sb_sel.sel_klist))
1.36 jdolecek 524: so->so_rcv.sb_flags &= ~SB_KNOTE;
525: }
526:
527: static int
528: filt_fiforead(struct knote *kn, long hint)
529: {
530: struct socket *so;
531:
532: so = (struct socket *)kn->kn_hook;
533: kn->kn_data = so->so_rcv.sb_cc;
534: if (so->so_state & SS_CANTRCVMORE) {
535: kn->kn_flags |= EV_EOF;
536: return (1);
537: }
538: kn->kn_flags &= ~EV_EOF;
539: return (kn->kn_data > 0);
540: }
541:
542: static void
543: filt_fifowdetach(struct knote *kn)
544: {
545: struct socket *so;
546:
547: so = (struct socket *)kn->kn_hook;
1.37 christos 548: SLIST_REMOVE(&so->so_snd.sb_sel.sel_klist, kn, knote, kn_selnext);
549: if (SLIST_EMPTY(&so->so_snd.sb_sel.sel_klist))
1.36 jdolecek 550: so->so_snd.sb_flags &= ~SB_KNOTE;
551: }
552:
553: static int
554: filt_fifowrite(struct knote *kn, long hint)
555: {
556: struct socket *so;
557:
558: so = (struct socket *)kn->kn_hook;
559: kn->kn_data = sbspace(&so->so_snd);
560: if (so->so_state & SS_CANTSENDMORE) {
561: kn->kn_flags |= EV_EOF;
562: return (1);
563: }
564: kn->kn_flags &= ~EV_EOF;
565: return (kn->kn_data >= so->so_snd.sb_lowat);
566: }
567:
568: static const struct filterops fiforead_filtops =
569: { 1, NULL, filt_fifordetach, filt_fiforead };
570: static const struct filterops fifowrite_filtops =
571: { 1, NULL, filt_fifowdetach, filt_fifowrite };
572:
573: /* ARGSUSED */
574: int
575: fifo_kqfilter(void *v)
576: {
577: struct vop_kqfilter_args /* {
578: struct vnode *a_vp;
579: struct knote *a_kn;
580: } */ *ap = v;
581: struct socket *so;
582: struct sockbuf *sb;
583:
584: so = (struct socket *)ap->a_vp->v_fifoinfo->fi_readsock;
585: switch (ap->a_kn->kn_filter) {
586: case EVFILT_READ:
587: ap->a_kn->kn_fop = &fiforead_filtops;
588: sb = &so->so_rcv;
589: break;
590: case EVFILT_WRITE:
591: ap->a_kn->kn_fop = &fifowrite_filtops;
592: sb = &so->so_snd;
593: break;
594: default:
595: return (1);
596: }
597:
598: ap->a_kn->kn_hook = so;
599:
1.37 christos 600: SLIST_INSERT_HEAD(&sb->sb_sel.sel_klist, ap->a_kn, kn_selnext);
1.36 jdolecek 601: sb->sb_flags |= SB_KNOTE;
602: return (0);
1.1 cgd 603: }
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