1/* 2 * Copyright (c) 1990, 1993 3 * The Regents of the University of California. 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 * 33 * @(#)fifo_vnops.c 8.2 (Berkeley) 1/4/94
| 1/* 2 * Copyright (c) 1990, 1993 3 * The Regents of the University of California. 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 * 33 * @(#)fifo_vnops.c 8.2 (Berkeley) 1/4/94
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35 */ 36 37#include <sys/param.h> 38#include <sys/proc.h> 39#include <sys/time.h> 40#include <sys/namei.h> 41#include <sys/vnode.h> 42#include <sys/socket.h> 43#include <sys/socketvar.h> 44#include <sys/stat.h> 45#include <sys/systm.h> 46#include <sys/ioctl.h> 47#include <sys/file.h> 48#include <sys/errno.h> 49#include <sys/malloc.h> 50#include <miscfs/fifofs/fifo.h> 51 52/* 53 * This structure is associated with the FIFO vnode and stores 54 * the state associated with the FIFO. 55 */ 56struct fifoinfo { 57 struct socket *fi_readsock; 58 struct socket *fi_writesock; 59 long fi_readers; 60 long fi_writers; 61}; 62 63int (**fifo_vnodeop_p)(); 64struct vnodeopv_entry_desc fifo_vnodeop_entries[] = { 65 { &vop_default_desc, vn_default_error }, 66 { &vop_lookup_desc, fifo_lookup }, /* lookup */ 67 { &vop_create_desc, fifo_create }, /* create */ 68 { &vop_mknod_desc, fifo_mknod }, /* mknod */ 69 { &vop_open_desc, fifo_open }, /* open */ 70 { &vop_close_desc, fifo_close }, /* close */ 71 { &vop_access_desc, fifo_access }, /* access */ 72 { &vop_getattr_desc, fifo_getattr }, /* getattr */ 73 { &vop_setattr_desc, fifo_setattr }, /* setattr */ 74 { &vop_read_desc, fifo_read }, /* read */ 75 { &vop_write_desc, fifo_write }, /* write */ 76 { &vop_ioctl_desc, fifo_ioctl }, /* ioctl */ 77 { &vop_select_desc, fifo_select }, /* select */ 78 { &vop_mmap_desc, fifo_mmap }, /* mmap */ 79 { &vop_fsync_desc, fifo_fsync }, /* fsync */ 80 { &vop_seek_desc, fifo_seek }, /* seek */ 81 { &vop_remove_desc, fifo_remove }, /* remove */ 82 { &vop_link_desc, fifo_link }, /* link */ 83 { &vop_rename_desc, fifo_rename }, /* rename */ 84 { &vop_mkdir_desc, fifo_mkdir }, /* mkdir */ 85 { &vop_rmdir_desc, fifo_rmdir }, /* rmdir */ 86 { &vop_symlink_desc, fifo_symlink }, /* symlink */ 87 { &vop_readdir_desc, fifo_readdir }, /* readdir */ 88 { &vop_readlink_desc, fifo_readlink }, /* readlink */ 89 { &vop_abortop_desc, fifo_abortop }, /* abortop */ 90 { &vop_inactive_desc, fifo_inactive }, /* inactive */ 91 { &vop_reclaim_desc, fifo_reclaim }, /* reclaim */ 92 { &vop_lock_desc, fifo_lock }, /* lock */ 93 { &vop_unlock_desc, fifo_unlock }, /* unlock */ 94 { &vop_bmap_desc, fifo_bmap }, /* bmap */ 95 { &vop_strategy_desc, fifo_strategy }, /* strategy */ 96 { &vop_print_desc, fifo_print }, /* print */ 97 { &vop_islocked_desc, fifo_islocked }, /* islocked */ 98 { &vop_pathconf_desc, fifo_pathconf }, /* pathconf */ 99 { &vop_advlock_desc, fifo_advlock }, /* advlock */ 100 { &vop_blkatoff_desc, fifo_blkatoff }, /* blkatoff */ 101 { &vop_valloc_desc, fifo_valloc }, /* valloc */ 102 { &vop_vfree_desc, fifo_vfree }, /* vfree */ 103 { &vop_truncate_desc, fifo_truncate }, /* truncate */ 104 { &vop_update_desc, fifo_update }, /* update */ 105 { &vop_bwrite_desc, fifo_bwrite }, /* bwrite */ 106 { (struct vnodeop_desc*)NULL, (int(*)())NULL } 107}; 108struct vnodeopv_desc fifo_vnodeop_opv_desc = 109 { &fifo_vnodeop_p, fifo_vnodeop_entries }; 110
| 35 */ 36 37#include <sys/param.h> 38#include <sys/proc.h> 39#include <sys/time.h> 40#include <sys/namei.h> 41#include <sys/vnode.h> 42#include <sys/socket.h> 43#include <sys/socketvar.h> 44#include <sys/stat.h> 45#include <sys/systm.h> 46#include <sys/ioctl.h> 47#include <sys/file.h> 48#include <sys/errno.h> 49#include <sys/malloc.h> 50#include <miscfs/fifofs/fifo.h> 51 52/* 53 * This structure is associated with the FIFO vnode and stores 54 * the state associated with the FIFO. 55 */ 56struct fifoinfo { 57 struct socket *fi_readsock; 58 struct socket *fi_writesock; 59 long fi_readers; 60 long fi_writers; 61}; 62 63int (**fifo_vnodeop_p)(); 64struct vnodeopv_entry_desc fifo_vnodeop_entries[] = { 65 { &vop_default_desc, vn_default_error }, 66 { &vop_lookup_desc, fifo_lookup }, /* lookup */ 67 { &vop_create_desc, fifo_create }, /* create */ 68 { &vop_mknod_desc, fifo_mknod }, /* mknod */ 69 { &vop_open_desc, fifo_open }, /* open */ 70 { &vop_close_desc, fifo_close }, /* close */ 71 { &vop_access_desc, fifo_access }, /* access */ 72 { &vop_getattr_desc, fifo_getattr }, /* getattr */ 73 { &vop_setattr_desc, fifo_setattr }, /* setattr */ 74 { &vop_read_desc, fifo_read }, /* read */ 75 { &vop_write_desc, fifo_write }, /* write */ 76 { &vop_ioctl_desc, fifo_ioctl }, /* ioctl */ 77 { &vop_select_desc, fifo_select }, /* select */ 78 { &vop_mmap_desc, fifo_mmap }, /* mmap */ 79 { &vop_fsync_desc, fifo_fsync }, /* fsync */ 80 { &vop_seek_desc, fifo_seek }, /* seek */ 81 { &vop_remove_desc, fifo_remove }, /* remove */ 82 { &vop_link_desc, fifo_link }, /* link */ 83 { &vop_rename_desc, fifo_rename }, /* rename */ 84 { &vop_mkdir_desc, fifo_mkdir }, /* mkdir */ 85 { &vop_rmdir_desc, fifo_rmdir }, /* rmdir */ 86 { &vop_symlink_desc, fifo_symlink }, /* symlink */ 87 { &vop_readdir_desc, fifo_readdir }, /* readdir */ 88 { &vop_readlink_desc, fifo_readlink }, /* readlink */ 89 { &vop_abortop_desc, fifo_abortop }, /* abortop */ 90 { &vop_inactive_desc, fifo_inactive }, /* inactive */ 91 { &vop_reclaim_desc, fifo_reclaim }, /* reclaim */ 92 { &vop_lock_desc, fifo_lock }, /* lock */ 93 { &vop_unlock_desc, fifo_unlock }, /* unlock */ 94 { &vop_bmap_desc, fifo_bmap }, /* bmap */ 95 { &vop_strategy_desc, fifo_strategy }, /* strategy */ 96 { &vop_print_desc, fifo_print }, /* print */ 97 { &vop_islocked_desc, fifo_islocked }, /* islocked */ 98 { &vop_pathconf_desc, fifo_pathconf }, /* pathconf */ 99 { &vop_advlock_desc, fifo_advlock }, /* advlock */ 100 { &vop_blkatoff_desc, fifo_blkatoff }, /* blkatoff */ 101 { &vop_valloc_desc, fifo_valloc }, /* valloc */ 102 { &vop_vfree_desc, fifo_vfree }, /* vfree */ 103 { &vop_truncate_desc, fifo_truncate }, /* truncate */ 104 { &vop_update_desc, fifo_update }, /* update */ 105 { &vop_bwrite_desc, fifo_bwrite }, /* bwrite */ 106 { (struct vnodeop_desc*)NULL, (int(*)())NULL } 107}; 108struct vnodeopv_desc fifo_vnodeop_opv_desc = 109 { &fifo_vnodeop_p, fifo_vnodeop_entries }; 110
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111/* 112 * Trivial lookup routine that always fails. 113 */ 114/* ARGSUSED */ 115int 116fifo_lookup(ap) 117 struct vop_lookup_args /* { 118 struct vnode * a_dvp; 119 struct vnode ** a_vpp; 120 struct componentname * a_cnp; 121 } */ *ap; 122{ 123 124 *ap->a_vpp = NULL; 125 return (ENOTDIR); 126} 127 128/* 129 * Open called to set up a new instance of a fifo or 130 * to find an active instance of a fifo. 131 */ 132/* ARGSUSED */ 133int 134fifo_open(ap) 135 struct vop_open_args /* { 136 struct vnode *a_vp; 137 int a_mode; 138 struct ucred *a_cred; 139 struct proc *a_p; 140 } */ *ap; 141{ 142 register struct vnode *vp = ap->a_vp; 143 register struct fifoinfo *fip; 144 struct socket *rso, *wso; 145 int error; 146 static char openstr[] = "fifo"; 147 148 if ((ap->a_mode & (FREAD|FWRITE)) == (FREAD|FWRITE)) 149 return (EINVAL); 150 if ((fip = vp->v_fifoinfo) == NULL) { 151 MALLOC(fip, struct fifoinfo *, sizeof(*fip), M_VNODE, M_WAITOK); 152 vp->v_fifoinfo = fip; 153 if (error = socreate(AF_UNIX, &rso, SOCK_STREAM, 0)) { 154 free(fip, M_VNODE); 155 vp->v_fifoinfo = NULL; 156 return (error); 157 } 158 fip->fi_readsock = rso; 159 if (error = socreate(AF_UNIX, &wso, SOCK_STREAM, 0)) { 160 (void)soclose(rso); 161 free(fip, M_VNODE); 162 vp->v_fifoinfo = NULL; 163 return (error); 164 } 165 fip->fi_writesock = wso; 166 if (error = unp_connect2(wso, rso)) { 167 (void)soclose(wso); 168 (void)soclose(rso); 169 free(fip, M_VNODE); 170 vp->v_fifoinfo = NULL; 171 return (error); 172 } 173 fip->fi_readers = fip->fi_writers = 0; 174 wso->so_state |= SS_CANTRCVMORE; 175 rso->so_state |= SS_CANTSENDMORE; 176 } 177 error = 0; 178 if (ap->a_mode & FREAD) { 179 fip->fi_readers++; 180 if (fip->fi_readers == 1) { 181 fip->fi_writesock->so_state &= ~SS_CANTSENDMORE; 182 if (fip->fi_writers > 0) 183 wakeup((caddr_t)&fip->fi_writers); 184 } 185 if (ap->a_mode & O_NONBLOCK) 186 return (0); 187 while (fip->fi_writers == 0) { 188 VOP_UNLOCK(vp); 189 error = tsleep((caddr_t)&fip->fi_readers, 190 PCATCH | PSOCK, openstr, 0); 191 VOP_LOCK(vp); 192 if (error) 193 break; 194 } 195 } else { 196 fip->fi_writers++; 197 if (fip->fi_readers == 0 && (ap->a_mode & O_NONBLOCK)) { 198 error = ENXIO; 199 } else { 200 if (fip->fi_writers == 1) { 201 fip->fi_readsock->so_state &= ~SS_CANTRCVMORE; 202 if (fip->fi_readers > 0) 203 wakeup((caddr_t)&fip->fi_readers); 204 } 205 while (fip->fi_readers == 0) { 206 VOP_UNLOCK(vp); 207 error = tsleep((caddr_t)&fip->fi_writers, 208 PCATCH | PSOCK, openstr, 0); 209 VOP_LOCK(vp); 210 if (error) 211 break; 212 } 213 } 214 } 215 if (error) 216 VOP_CLOSE(vp, ap->a_mode, ap->a_cred, ap->a_p); 217 return (error); 218} 219 220/* 221 * Vnode op for read 222 */ 223/* ARGSUSED */ 224int 225fifo_read(ap) 226 struct vop_read_args /* { 227 struct vnode *a_vp; 228 struct uio *a_uio; 229 int a_ioflag; 230 struct ucred *a_cred; 231 } */ *ap; 232{ 233 register struct uio *uio = ap->a_uio; 234 register struct socket *rso = ap->a_vp->v_fifoinfo->fi_readsock; 235 int error, startresid; 236 237#ifdef DIAGNOSTIC 238 if (uio->uio_rw != UIO_READ) 239 panic("fifo_read mode"); 240#endif 241 if (uio->uio_resid == 0) 242 return (0); 243 if (ap->a_ioflag & IO_NDELAY) 244 rso->so_state |= SS_NBIO; 245 startresid = uio->uio_resid; 246 VOP_UNLOCK(ap->a_vp); 247 error = soreceive(rso, (struct mbuf **)0, uio, (int *)0, 248 (struct mbuf **)0, (struct mbuf **)0); 249 VOP_LOCK(ap->a_vp); 250 /* 251 * Clear EOF indication after first such return. 252 */ 253 if (uio->uio_resid == startresid) 254 rso->so_state &= ~SS_CANTRCVMORE; 255 if (ap->a_ioflag & IO_NDELAY) 256 rso->so_state &= ~SS_NBIO; 257 return (error); 258} 259 260/* 261 * Vnode op for write 262 */ 263/* ARGSUSED */ 264int 265fifo_write(ap) 266 struct vop_write_args /* { 267 struct vnode *a_vp; 268 struct uio *a_uio; 269 int a_ioflag; 270 struct ucred *a_cred; 271 } */ *ap; 272{ 273 struct socket *wso = ap->a_vp->v_fifoinfo->fi_writesock; 274 int error; 275 276#ifdef DIAGNOSTIC 277 if (ap->a_uio->uio_rw != UIO_WRITE) 278 panic("fifo_write mode"); 279#endif 280 if (ap->a_ioflag & IO_NDELAY) 281 wso->so_state |= SS_NBIO; 282 VOP_UNLOCK(ap->a_vp); 283 error = sosend(wso, (struct mbuf *)0, ap->a_uio, 0, (struct mbuf *)0, 0); 284 VOP_LOCK(ap->a_vp); 285 if (ap->a_ioflag & IO_NDELAY) 286 wso->so_state &= ~SS_NBIO; 287 return (error); 288} 289 290/* 291 * Device ioctl operation. 292 */ 293/* ARGSUSED */ 294int 295fifo_ioctl(ap) 296 struct vop_ioctl_args /* { 297 struct vnode *a_vp; 298 int a_command; 299 caddr_t a_data; 300 int a_fflag; 301 struct ucred *a_cred; 302 struct proc *a_p; 303 } */ *ap; 304{ 305 struct file filetmp; 306 307 if (ap->a_command == FIONBIO) 308 return (0); 309 if (ap->a_fflag & FREAD) 310 filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_readsock; 311 else 312 filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_writesock; 313 return (soo_ioctl(&filetmp, ap->a_command, ap->a_data, ap->a_p)); 314} 315 316/* ARGSUSED */ 317int 318fifo_select(ap) 319 struct vop_select_args /* { 320 struct vnode *a_vp; 321 int a_which; 322 int a_fflags; 323 struct ucred *a_cred; 324 struct proc *a_p; 325 } */ *ap; 326{ 327 struct file filetmp; 328 329 if (ap->a_fflags & FREAD) 330 filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_readsock; 331 else 332 filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_writesock; 333 return (soo_select(&filetmp, ap->a_which, ap->a_p)); 334} 335 336/* 337 * This is a noop, simply returning what one has been given. 338 */ 339int 340fifo_bmap(ap) 341 struct vop_bmap_args /* { 342 struct vnode *a_vp; 343 daddr_t a_bn; 344 struct vnode **a_vpp; 345 daddr_t *a_bnp; 346 } */ *ap; 347{ 348 349 if (ap->a_vpp != NULL) 350 *ap->a_vpp = ap->a_vp; 351 if (ap->a_bnp != NULL) 352 *ap->a_bnp = ap->a_bn; 353 return (0); 354} 355 356/* 357 * At the moment we do not do any locking. 358 */ 359/* ARGSUSED */ 360int 361fifo_lock(ap) 362 struct vop_lock_args /* { 363 struct vnode *a_vp; 364 } */ *ap; 365{ 366 367 return (0); 368} 369 370/* ARGSUSED */ 371int 372fifo_unlock(ap) 373 struct vop_unlock_args /* { 374 struct vnode *a_vp; 375 } */ *ap; 376{ 377 378 return (0); 379} 380 381/* 382 * Device close routine 383 */ 384/* ARGSUSED */ 385int 386fifo_close(ap) 387 struct vop_close_args /* { 388 struct vnode *a_vp; 389 int a_fflag; 390 struct ucred *a_cred; 391 struct proc *a_p; 392 } */ *ap; 393{ 394 register struct vnode *vp = ap->a_vp; 395 register struct fifoinfo *fip = vp->v_fifoinfo; 396 int error1, error2; 397 398 if (ap->a_fflag & FWRITE) { 399 fip->fi_writers--; 400 if (fip->fi_writers == 0) 401 socantrcvmore(fip->fi_readsock); 402 } else { 403 fip->fi_readers--; 404 if (fip->fi_readers == 0) 405 socantsendmore(fip->fi_writesock); 406 } 407 if (vp->v_usecount > 1) 408 return (0); 409 error1 = soclose(fip->fi_readsock); 410 error2 = soclose(fip->fi_writesock); 411 FREE(fip, M_VNODE); 412 vp->v_fifoinfo = NULL; 413 if (error1) 414 return (error1); 415 return (error2); 416} 417 418/* 419 * Print out the contents of a fifo vnode. 420 */ 421int 422fifo_print(ap) 423 struct vop_print_args /* { 424 struct vnode *a_vp; 425 } */ *ap; 426{ 427 428 printf("tag VT_NON"); 429 fifo_printinfo(ap->a_vp); 430 printf("\n"); 431 return (0); 432} 433 434/* 435 * Print out internal contents of a fifo vnode. 436 */ 437int 438fifo_printinfo(vp) 439 struct vnode *vp; 440{ 441 register struct fifoinfo *fip = vp->v_fifoinfo; 442 443 printf(", fifo with %d readers and %d writers", 444 fip->fi_readers, fip->fi_writers); 445 return (0); 446} 447 448/* 449 * Return POSIX pathconf information applicable to fifo's. 450 */ 451int 452fifo_pathconf(ap) 453 struct vop_pathconf_args /* { 454 struct vnode *a_vp; 455 int a_name; 456 int *a_retval; 457 } */ *ap; 458{ 459 460 switch (ap->a_name) { 461 case _PC_LINK_MAX: 462 *ap->a_retval = LINK_MAX; 463 return (0); 464 case _PC_PIPE_BUF: 465 *ap->a_retval = PIPE_BUF; 466 return (0); 467 case _PC_CHOWN_RESTRICTED: 468 *ap->a_retval = 1; 469 return (0); 470 default: 471 return (EINVAL); 472 } 473 /* NOTREACHED */ 474} 475 476/* 477 * Fifo failed operation 478 */ 479int 480fifo_ebadf() 481{ 482 483 return (EBADF); 484} 485 486/* 487 * Fifo advisory byte-level locks. 488 */ 489/* ARGSUSED */ 490int 491fifo_advlock(ap) 492 struct vop_advlock_args /* { 493 struct vnode *a_vp; 494 caddr_t a_id; 495 int a_op; 496 struct flock *a_fl; 497 int a_flags; 498 } */ *ap; 499{ 500 501 return (EOPNOTSUPP); 502} 503 504/* 505 * Fifo bad operation 506 */ 507int 508fifo_badop() 509{ 510 511 panic("fifo_badop called"); 512 /* NOTREACHED */ 513}
| 113/* 114 * Trivial lookup routine that always fails. 115 */ 116/* ARGSUSED */ 117int 118fifo_lookup(ap) 119 struct vop_lookup_args /* { 120 struct vnode * a_dvp; 121 struct vnode ** a_vpp; 122 struct componentname * a_cnp; 123 } */ *ap; 124{ 125 126 *ap->a_vpp = NULL; 127 return (ENOTDIR); 128} 129 130/* 131 * Open called to set up a new instance of a fifo or 132 * to find an active instance of a fifo. 133 */ 134/* ARGSUSED */ 135int 136fifo_open(ap) 137 struct vop_open_args /* { 138 struct vnode *a_vp; 139 int a_mode; 140 struct ucred *a_cred; 141 struct proc *a_p; 142 } */ *ap; 143{ 144 register struct vnode *vp = ap->a_vp; 145 register struct fifoinfo *fip; 146 struct socket *rso, *wso; 147 int error; 148 static char openstr[] = "fifo"; 149 150 if ((ap->a_mode & (FREAD|FWRITE)) == (FREAD|FWRITE)) 151 return (EINVAL); 152 if ((fip = vp->v_fifoinfo) == NULL) { 153 MALLOC(fip, struct fifoinfo *, sizeof(*fip), M_VNODE, M_WAITOK); 154 vp->v_fifoinfo = fip; 155 if (error = socreate(AF_UNIX, &rso, SOCK_STREAM, 0)) { 156 free(fip, M_VNODE); 157 vp->v_fifoinfo = NULL; 158 return (error); 159 } 160 fip->fi_readsock = rso; 161 if (error = socreate(AF_UNIX, &wso, SOCK_STREAM, 0)) { 162 (void)soclose(rso); 163 free(fip, M_VNODE); 164 vp->v_fifoinfo = NULL; 165 return (error); 166 } 167 fip->fi_writesock = wso; 168 if (error = unp_connect2(wso, rso)) { 169 (void)soclose(wso); 170 (void)soclose(rso); 171 free(fip, M_VNODE); 172 vp->v_fifoinfo = NULL; 173 return (error); 174 } 175 fip->fi_readers = fip->fi_writers = 0; 176 wso->so_state |= SS_CANTRCVMORE; 177 rso->so_state |= SS_CANTSENDMORE; 178 } 179 error = 0; 180 if (ap->a_mode & FREAD) { 181 fip->fi_readers++; 182 if (fip->fi_readers == 1) { 183 fip->fi_writesock->so_state &= ~SS_CANTSENDMORE; 184 if (fip->fi_writers > 0) 185 wakeup((caddr_t)&fip->fi_writers); 186 } 187 if (ap->a_mode & O_NONBLOCK) 188 return (0); 189 while (fip->fi_writers == 0) { 190 VOP_UNLOCK(vp); 191 error = tsleep((caddr_t)&fip->fi_readers, 192 PCATCH | PSOCK, openstr, 0); 193 VOP_LOCK(vp); 194 if (error) 195 break; 196 } 197 } else { 198 fip->fi_writers++; 199 if (fip->fi_readers == 0 && (ap->a_mode & O_NONBLOCK)) { 200 error = ENXIO; 201 } else { 202 if (fip->fi_writers == 1) { 203 fip->fi_readsock->so_state &= ~SS_CANTRCVMORE; 204 if (fip->fi_readers > 0) 205 wakeup((caddr_t)&fip->fi_readers); 206 } 207 while (fip->fi_readers == 0) { 208 VOP_UNLOCK(vp); 209 error = tsleep((caddr_t)&fip->fi_writers, 210 PCATCH | PSOCK, openstr, 0); 211 VOP_LOCK(vp); 212 if (error) 213 break; 214 } 215 } 216 } 217 if (error) 218 VOP_CLOSE(vp, ap->a_mode, ap->a_cred, ap->a_p); 219 return (error); 220} 221 222/* 223 * Vnode op for read 224 */ 225/* ARGSUSED */ 226int 227fifo_read(ap) 228 struct vop_read_args /* { 229 struct vnode *a_vp; 230 struct uio *a_uio; 231 int a_ioflag; 232 struct ucred *a_cred; 233 } */ *ap; 234{ 235 register struct uio *uio = ap->a_uio; 236 register struct socket *rso = ap->a_vp->v_fifoinfo->fi_readsock; 237 int error, startresid; 238 239#ifdef DIAGNOSTIC 240 if (uio->uio_rw != UIO_READ) 241 panic("fifo_read mode"); 242#endif 243 if (uio->uio_resid == 0) 244 return (0); 245 if (ap->a_ioflag & IO_NDELAY) 246 rso->so_state |= SS_NBIO; 247 startresid = uio->uio_resid; 248 VOP_UNLOCK(ap->a_vp); 249 error = soreceive(rso, (struct mbuf **)0, uio, (int *)0, 250 (struct mbuf **)0, (struct mbuf **)0); 251 VOP_LOCK(ap->a_vp); 252 /* 253 * Clear EOF indication after first such return. 254 */ 255 if (uio->uio_resid == startresid) 256 rso->so_state &= ~SS_CANTRCVMORE; 257 if (ap->a_ioflag & IO_NDELAY) 258 rso->so_state &= ~SS_NBIO; 259 return (error); 260} 261 262/* 263 * Vnode op for write 264 */ 265/* ARGSUSED */ 266int 267fifo_write(ap) 268 struct vop_write_args /* { 269 struct vnode *a_vp; 270 struct uio *a_uio; 271 int a_ioflag; 272 struct ucred *a_cred; 273 } */ *ap; 274{ 275 struct socket *wso = ap->a_vp->v_fifoinfo->fi_writesock; 276 int error; 277 278#ifdef DIAGNOSTIC 279 if (ap->a_uio->uio_rw != UIO_WRITE) 280 panic("fifo_write mode"); 281#endif 282 if (ap->a_ioflag & IO_NDELAY) 283 wso->so_state |= SS_NBIO; 284 VOP_UNLOCK(ap->a_vp); 285 error = sosend(wso, (struct mbuf *)0, ap->a_uio, 0, (struct mbuf *)0, 0); 286 VOP_LOCK(ap->a_vp); 287 if (ap->a_ioflag & IO_NDELAY) 288 wso->so_state &= ~SS_NBIO; 289 return (error); 290} 291 292/* 293 * Device ioctl operation. 294 */ 295/* ARGSUSED */ 296int 297fifo_ioctl(ap) 298 struct vop_ioctl_args /* { 299 struct vnode *a_vp; 300 int a_command; 301 caddr_t a_data; 302 int a_fflag; 303 struct ucred *a_cred; 304 struct proc *a_p; 305 } */ *ap; 306{ 307 struct file filetmp; 308 309 if (ap->a_command == FIONBIO) 310 return (0); 311 if (ap->a_fflag & FREAD) 312 filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_readsock; 313 else 314 filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_writesock; 315 return (soo_ioctl(&filetmp, ap->a_command, ap->a_data, ap->a_p)); 316} 317 318/* ARGSUSED */ 319int 320fifo_select(ap) 321 struct vop_select_args /* { 322 struct vnode *a_vp; 323 int a_which; 324 int a_fflags; 325 struct ucred *a_cred; 326 struct proc *a_p; 327 } */ *ap; 328{ 329 struct file filetmp; 330 331 if (ap->a_fflags & FREAD) 332 filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_readsock; 333 else 334 filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_writesock; 335 return (soo_select(&filetmp, ap->a_which, ap->a_p)); 336} 337 338/* 339 * This is a noop, simply returning what one has been given. 340 */ 341int 342fifo_bmap(ap) 343 struct vop_bmap_args /* { 344 struct vnode *a_vp; 345 daddr_t a_bn; 346 struct vnode **a_vpp; 347 daddr_t *a_bnp; 348 } */ *ap; 349{ 350 351 if (ap->a_vpp != NULL) 352 *ap->a_vpp = ap->a_vp; 353 if (ap->a_bnp != NULL) 354 *ap->a_bnp = ap->a_bn; 355 return (0); 356} 357 358/* 359 * At the moment we do not do any locking. 360 */ 361/* ARGSUSED */ 362int 363fifo_lock(ap) 364 struct vop_lock_args /* { 365 struct vnode *a_vp; 366 } */ *ap; 367{ 368 369 return (0); 370} 371 372/* ARGSUSED */ 373int 374fifo_unlock(ap) 375 struct vop_unlock_args /* { 376 struct vnode *a_vp; 377 } */ *ap; 378{ 379 380 return (0); 381} 382 383/* 384 * Device close routine 385 */ 386/* ARGSUSED */ 387int 388fifo_close(ap) 389 struct vop_close_args /* { 390 struct vnode *a_vp; 391 int a_fflag; 392 struct ucred *a_cred; 393 struct proc *a_p; 394 } */ *ap; 395{ 396 register struct vnode *vp = ap->a_vp; 397 register struct fifoinfo *fip = vp->v_fifoinfo; 398 int error1, error2; 399 400 if (ap->a_fflag & FWRITE) { 401 fip->fi_writers--; 402 if (fip->fi_writers == 0) 403 socantrcvmore(fip->fi_readsock); 404 } else { 405 fip->fi_readers--; 406 if (fip->fi_readers == 0) 407 socantsendmore(fip->fi_writesock); 408 } 409 if (vp->v_usecount > 1) 410 return (0); 411 error1 = soclose(fip->fi_readsock); 412 error2 = soclose(fip->fi_writesock); 413 FREE(fip, M_VNODE); 414 vp->v_fifoinfo = NULL; 415 if (error1) 416 return (error1); 417 return (error2); 418} 419 420/* 421 * Print out the contents of a fifo vnode. 422 */ 423int 424fifo_print(ap) 425 struct vop_print_args /* { 426 struct vnode *a_vp; 427 } */ *ap; 428{ 429 430 printf("tag VT_NON"); 431 fifo_printinfo(ap->a_vp); 432 printf("\n"); 433 return (0); 434} 435 436/* 437 * Print out internal contents of a fifo vnode. 438 */ 439int 440fifo_printinfo(vp) 441 struct vnode *vp; 442{ 443 register struct fifoinfo *fip = vp->v_fifoinfo; 444 445 printf(", fifo with %d readers and %d writers", 446 fip->fi_readers, fip->fi_writers); 447 return (0); 448} 449 450/* 451 * Return POSIX pathconf information applicable to fifo's. 452 */ 453int 454fifo_pathconf(ap) 455 struct vop_pathconf_args /* { 456 struct vnode *a_vp; 457 int a_name; 458 int *a_retval; 459 } */ *ap; 460{ 461 462 switch (ap->a_name) { 463 case _PC_LINK_MAX: 464 *ap->a_retval = LINK_MAX; 465 return (0); 466 case _PC_PIPE_BUF: 467 *ap->a_retval = PIPE_BUF; 468 return (0); 469 case _PC_CHOWN_RESTRICTED: 470 *ap->a_retval = 1; 471 return (0); 472 default: 473 return (EINVAL); 474 } 475 /* NOTREACHED */ 476} 477 478/* 479 * Fifo failed operation 480 */ 481int 482fifo_ebadf() 483{ 484 485 return (EBADF); 486} 487 488/* 489 * Fifo advisory byte-level locks. 490 */ 491/* ARGSUSED */ 492int 493fifo_advlock(ap) 494 struct vop_advlock_args /* { 495 struct vnode *a_vp; 496 caddr_t a_id; 497 int a_op; 498 struct flock *a_fl; 499 int a_flags; 500 } */ *ap; 501{ 502 503 return (EOPNOTSUPP); 504} 505 506/* 507 * Fifo bad operation 508 */ 509int 510fifo_badop() 511{ 512 513 panic("fifo_badop called"); 514 /* NOTREACHED */ 515}
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