39 */
40
41/*
42 * /dev/fd Filesystem
43 */
44
45#include <sys/param.h>
46#include <sys/systm.h>
47#include <sys/types.h>
48#include <sys/time.h>
49#include <sys/proc.h>
50#include <sys/kernel.h> /* boottime */
51#include <sys/resourcevar.h>
52#include <sys/filedesc.h>
53#include <sys/vnode.h>
54#include <sys/malloc.h>
55#include <sys/file.h>
56#include <sys/stat.h>
57#include <sys/mount.h>
58#include <sys/namei.h>
59#include <sys/buf.h>
60#include <sys/dirent.h>
61#include <miscfs/fdesc/fdesc.h>
62
63#define cttyvp(p) ((p)->p_flag & P_CONTROLT ? (p)->p_session->s_ttyvp : NULL)
64
65#define FDL_WANT 0x01
66#define FDL_LOCKED 0x02
67static int fdcache_lock;
68
69dev_t devctty;
70
71#if (FD_STDIN != FD_STDOUT-1) || (FD_STDOUT != FD_STDERR-1)
72FD_STDIN, FD_STDOUT, FD_STDERR must be a sequence n, n+1, n+2
73#endif
74
75#define NFDCACHE 4
76#define FD_NHASH(ix) ((ix) & NFDCACHE-1)
77
78/*
79 * Cache head
80 */
81struct fdcache {
82 struct fdescnode *fc_forw;
83 struct fdescnode *fc_back;
84};
85
86static struct fdcache fdcache[NFDCACHE];
87
88/*
89 * Initialise cache headers
90 */
91int
92fdesc_init()
93{
94 struct fdcache *fc;
95
96 devctty = makedev(nchrdev, 0);
97
98 for (fc = fdcache; fc < fdcache + NFDCACHE; fc++)
99 fc->fc_forw = fc->fc_back = (struct fdescnode *) fc;
100 return (0);
101}
102
103/*
104 * Compute hash list for given target vnode
105 */
106static struct fdcache *
107fdesc_hash(ix)
108 int ix;
109{
110
111 return (&fdcache[FD_NHASH(ix)]);
112}
113
114int
115fdesc_allocvp(ftype, ix, mp, vpp)
116 fdntype ftype;
117 int ix;
118 struct mount *mp;
119 struct vnode **vpp;
120{
121 struct fdcache *fc;
122 struct fdescnode *fd;
123 int error = 0;
124
125loop:
126 fc = fdesc_hash(ix);
127 for (fd = fc->fc_forw; fd != (struct fdescnode *) fc; fd = fd->fd_forw) {
128 if (fd->fd_ix == ix && fd->fd_vnode->v_mount == mp) {
129 if (vget(fd->fd_vnode, 0))
130 goto loop;
131 *vpp = fd->fd_vnode;
132 return (error);
133 }
134 }
135
136 /*
137 * otherwise lock the array while we call getnewvnode
138 * since that can block.
139 */
140 if (fdcache_lock & FDL_LOCKED) {
141 fdcache_lock |= FDL_WANT;
142 sleep((caddr_t) &fdcache_lock, PINOD);
143 goto loop;
144 }
145 fdcache_lock |= FDL_LOCKED;
146
147 error = getnewvnode(VT_FDESC, mp, fdesc_vnodeop_p, vpp);
148 if (error)
149 goto out;
150 MALLOC(fd, void *, sizeof(struct fdescnode), M_TEMP, M_WAITOK);
151 (*vpp)->v_data = fd;
152 fd->fd_vnode = *vpp;
153 fd->fd_type = ftype;
154 fd->fd_fd = -1;
155 fd->fd_link = 0;
156 fd->fd_ix = ix;
157 fc = fdesc_hash(ix);
158 insque(fd, fc);
159
160out:;
161 fdcache_lock &= ~FDL_LOCKED;
162
163 if (fdcache_lock & FDL_WANT) {
164 fdcache_lock &= ~FDL_WANT;
165 wakeup((caddr_t) &fdcache_lock);
166 }
167
168 return (error);
169}
170
171/*
172 * vp is the current namei directory
173 * ndp is the name to locate in that directory...
174 */
175int
176fdesc_lookup(ap)
177 struct vop_lookup_args /* {
178 struct vnode * a_dvp;
179 struct vnode ** a_vpp;
180 struct componentname * a_cnp;
181 } */ *ap;
182{
183 struct vnode **vpp = ap->a_vpp;
184 struct vnode *dvp = ap->a_dvp;
185 char *pname;
186 struct proc *p;
187 int nfiles;
188 unsigned fd = 0;
189 int error;
190 struct vnode *fvp;
191 char *ln;
192
193 pname = ap->a_cnp->cn_nameptr;
194 if (ap->a_cnp->cn_namelen == 1 && *pname == '.') {
195 *vpp = dvp;
196 VREF(dvp);
197 VOP_LOCK(dvp);
198 return (0);
199 }
200
201 p = ap->a_cnp->cn_proc;
202 nfiles = p->p_fd->fd_nfiles;
203
204 switch (VTOFDESC(dvp)->fd_type) {
205 default:
206 case Flink:
207 case Fdesc:
208 case Fctty:
209 error = ENOTDIR;
210 goto bad;
211
212 case Froot:
213 if (ap->a_cnp->cn_namelen == 2 && bcmp(pname, "fd", 2) == 0) {
214 error = fdesc_allocvp(Fdevfd, FD_DEVFD, dvp->v_mount, &fvp);
215 if (error)
216 goto bad;
217 *vpp = fvp;
218 fvp->v_type = VDIR;
219 VOP_LOCK(fvp);
220 return (0);
221 }
222
223 if (ap->a_cnp->cn_namelen == 3 && bcmp(pname, "tty", 3) == 0) {
224 struct vnode *ttyvp = cttyvp(p);
225 if (ttyvp == NULL) {
226 error = ENXIO;
227 goto bad;
228 }
229 error = fdesc_allocvp(Fctty, FD_CTTY, dvp->v_mount, &fvp);
230 if (error)
231 goto bad;
232 *vpp = fvp;
233 fvp->v_type = VFIFO;
234 VOP_LOCK(fvp);
235 return (0);
236 }
237
238 ln = 0;
239 switch (ap->a_cnp->cn_namelen) {
240 case 5:
241 if (bcmp(pname, "stdin", 5) == 0) {
242 ln = "fd/0";
243 fd = FD_STDIN;
244 }
245 break;
246 case 6:
247 if (bcmp(pname, "stdout", 6) == 0) {
248 ln = "fd/1";
249 fd = FD_STDOUT;
250 } else
251 if (bcmp(pname, "stderr", 6) == 0) {
252 ln = "fd/2";
253 fd = FD_STDERR;
254 }
255 break;
256 }
257
258 if (ln) {
259 error = fdesc_allocvp(Flink, fd, dvp->v_mount, &fvp);
260 if (error)
261 goto bad;
262 VTOFDESC(fvp)->fd_link = ln;
263 *vpp = fvp;
264 fvp->v_type = VLNK;
265 VOP_LOCK(fvp);
266 return (0);
267 } else {
268 error = ENOENT;
269 goto bad;
270 }
271
272 /* FALL THROUGH */
273
274 case Fdevfd:
275 if (ap->a_cnp->cn_namelen == 2 && bcmp(pname, "..", 2) == 0) {
276 error = fdesc_root(dvp->v_mount, vpp);
277 return (error);
278 }
279
280 fd = 0;
281 while (*pname >= '0' && *pname <= '9') {
282 fd = 10 * fd + *pname++ - '0';
283 if (fd >= nfiles)
284 break;
285 }
286
287 if (*pname != '\0') {
288 error = ENOENT;
289 goto bad;
290 }
291
292 if (fd >= nfiles || p->p_fd->fd_ofiles[fd] == NULL) {
293 error = EBADF;
294 goto bad;
295 }
296
297 error = fdesc_allocvp(Fdesc, FD_DESC+fd, dvp->v_mount, &fvp);
298 if (error)
299 goto bad;
300 VTOFDESC(fvp)->fd_fd = fd;
301 *vpp = fvp;
302 return (0);
303 }
304
305bad:;
306 *vpp = NULL;
307 return (error);
308}
309
310int
311fdesc_open(ap)
312 struct vop_open_args /* {
313 struct vnode *a_vp;
314 int a_mode;
315 struct ucred *a_cred;
316 struct proc *a_p;
317 } */ *ap;
318{
319 struct vnode *vp = ap->a_vp;
320 int error = 0;
321
322 switch (VTOFDESC(vp)->fd_type) {
323 case Fdesc:
324 /*
325 * XXX Kludge: set p->p_dupfd to contain the value of the
326 * the file descriptor being sought for duplication. The error
327 * return ensures that the vnode for this device will be
328 * released by vn_open. Open will detect this special error and
329 * take the actions in dupfdopen. Other callers of vn_open or
330 * VOP_OPEN will simply report the error.
331 */
332 ap->a_p->p_dupfd = VTOFDESC(vp)->fd_fd; /* XXX */
333 error = ENODEV;
334 break;
335
336 case Fctty:
337 error = cttyopen(devctty, ap->a_mode, 0, ap->a_p);
338 break;
339 }
340
341 return (error);
342}
343
344static int
345fdesc_attr(fd, vap, cred, p)
346 int fd;
347 struct vattr *vap;
348 struct ucred *cred;
349 struct proc *p;
350{
351 struct filedesc *fdp = p->p_fd;
352 struct file *fp;
353 struct stat stb;
354 int error;
355
356 if (fd >= fdp->fd_nfiles || (fp = fdp->fd_ofiles[fd]) == NULL)
357 return (EBADF);
358
359 switch (fp->f_type) {
360 case DTYPE_VNODE:
361 error = VOP_GETATTR((struct vnode *) fp->f_data, vap, cred, p);
362 if (error == 0 && vap->va_type == VDIR) {
363 /*
364 * don't allow directories to show up because
365 * that causes loops in the namespace.
366 */
367 vap->va_type = VFIFO;
368 }
369 break;
370
371 case DTYPE_SOCKET:
372 error = soo_stat((struct socket *)fp->f_data, &stb);
373 if (error == 0) {
374 vattr_null(vap);
375 vap->va_type = VSOCK;
376 vap->va_mode = stb.st_mode;
377 vap->va_nlink = stb.st_nlink;
378 vap->va_uid = stb.st_uid;
379 vap->va_gid = stb.st_gid;
380 vap->va_fsid = stb.st_dev;
381 vap->va_fileid = stb.st_ino;
382 vap->va_size = stb.st_size;
383 vap->va_blocksize = stb.st_blksize;
384 vap->va_atime = stb.st_atimespec;
385 vap->va_mtime = stb.st_mtimespec;
386 vap->va_ctime = stb.st_ctimespec;
387 vap->va_gen = stb.st_gen;
388 vap->va_flags = stb.st_flags;
389 vap->va_rdev = stb.st_rdev;
390 vap->va_bytes = stb.st_blocks * stb.st_blksize;
391 }
392 break;
393
394 default:
395 panic("fdesc attr");
396 break;
397 }
398
399 return (error);
400}
401
402int
403fdesc_getattr(ap)
404 struct vop_getattr_args /* {
405 struct vnode *a_vp;
406 struct vattr *a_vap;
407 struct ucred *a_cred;
408 struct proc *a_p;
409 } */ *ap;
410{
411 struct vnode *vp = ap->a_vp;
412 struct vattr *vap = ap->a_vap;
413 unsigned fd;
414 int error = 0;
415
416 switch (VTOFDESC(vp)->fd_type) {
417 case Froot:
418 case Fdevfd:
419 case Flink:
420 case Fctty:
421 bzero((caddr_t) vap, sizeof(*vap));
422 vattr_null(vap);
423 vap->va_fileid = VTOFDESC(vp)->fd_ix;
424
425 switch (VTOFDESC(vp)->fd_type) {
426 case Flink:
427 vap->va_mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
428 vap->va_type = VLNK;
429 vap->va_nlink = 1;
430 vap->va_size = strlen(VTOFDESC(vp)->fd_link);
431 break;
432
433 case Fctty:
434 vap->va_mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH;
435 vap->va_type = VFIFO;
436 vap->va_nlink = 1;
437 vap->va_size = 0;
438 break;
439
440 default:
441 vap->va_mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
442 vap->va_type = VDIR;
443 vap->va_nlink = 2;
444 vap->va_size = DEV_BSIZE;
445 break;
446 }
447 vap->va_uid = 0;
448 vap->va_gid = 0;
449 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
450 vap->va_blocksize = DEV_BSIZE;
451 vap->va_atime.ts_sec = boottime.tv_sec;
452 vap->va_atime.ts_nsec = 0;
453 vap->va_mtime = vap->va_atime;
454 vap->va_ctime = vap->va_mtime;
455 vap->va_gen = 0;
456 vap->va_flags = 0;
457 vap->va_rdev = 0;
458 vap->va_bytes = 0;
459 break;
460
461 case Fdesc:
462 fd = VTOFDESC(vp)->fd_fd;
463 error = fdesc_attr(fd, vap, ap->a_cred, ap->a_p);
464 break;
465
466 default:
467 panic("fdesc_getattr");
468 break;
469 }
470
471 if (error == 0)
472 vp->v_type = vap->va_type;
473
474 return (error);
475}
476
477int
478fdesc_setattr(ap)
479 struct vop_setattr_args /* {
480 struct vnode *a_vp;
481 struct vattr *a_vap;
482 struct ucred *a_cred;
483 struct proc *a_p;
484 } */ *ap;
485{
486 struct filedesc *fdp = ap->a_p->p_fd;
487 struct file *fp;
488 unsigned fd;
489 int error;
490
491 /*
492 * Can't mess with the root vnode
493 */
494 switch (VTOFDESC(ap->a_vp)->fd_type) {
495 case Fdesc:
496 break;
497
498 case Fctty:
499 return (0);
500
501 default:
502 return (EACCES);
503 }
504
505 fd = VTOFDESC(ap->a_vp)->fd_fd;
506 if (fd >= fdp->fd_nfiles || (fp = fdp->fd_ofiles[fd]) == NULL) {
507 return (EBADF);
508 }
509
510 /*
511 * Can setattr the underlying vnode, but not sockets!
512 */
513 switch (fp->f_type) {
514 case DTYPE_VNODE:
515 error = VOP_SETATTR((struct vnode *) fp->f_data, ap->a_vap, ap->a_cred, ap->a_p);
516 break;
517
518 case DTYPE_SOCKET:
519 error = 0;
520 break;
521
522 default:
523 error = EBADF;
524 break;
525 }
526
527 return (error);
528}
529
530#define UIO_MX 16
531
532static struct dirtmp {
533 u_long d_fileno;
534 u_short d_reclen;
535 u_short d_namlen;
536 char d_name[8];
537} rootent[] = {
538 { FD_DEVFD, UIO_MX, 2, "fd" },
539 { FD_STDIN, UIO_MX, 5, "stdin" },
540 { FD_STDOUT, UIO_MX, 6, "stdout" },
541 { FD_STDERR, UIO_MX, 6, "stderr" },
542 { FD_CTTY, UIO_MX, 3, "tty" },
543 { 0 }
544};
545
546int
547fdesc_readdir(ap)
548 struct vop_readdir_args /* {
549 struct vnode *a_vp;
550 struct uio *a_uio;
551 struct ucred *a_cred;
552 } */ *ap;
553{
554 struct uio *uio = ap->a_uio;
555 struct filedesc *fdp;
556 int i;
557 int error;
558
559 switch (VTOFDESC(ap->a_vp)->fd_type) {
560 case Fctty:
561 return (0);
562
563 case Fdesc:
564 return (ENOTDIR);
565
566 default:
567 break;
568 }
569
570 fdp = uio->uio_procp->p_fd;
571
572 if (VTOFDESC(ap->a_vp)->fd_type == Froot) {
573 struct dirent d;
574 struct dirent *dp = &d;
575 struct dirtmp *dt;
576
577 i = uio->uio_offset / UIO_MX;
578 error = 0;
579
580 while (uio->uio_resid > 0) {
581 dt = &rootent[i];
582 if (dt->d_fileno == 0) {
583 /**eofflagp = 1;*/
584 break;
585 }
586 i++;
587
588 switch (dt->d_fileno) {
589 case FD_CTTY:
590 if (cttyvp(uio->uio_procp) == NULL)
591 continue;
592 break;
593
594 case FD_STDIN:
595 case FD_STDOUT:
596 case FD_STDERR:
597 if ((dt->d_fileno-FD_STDIN) >= fdp->fd_nfiles)
598 continue;
599 if (fdp->fd_ofiles[dt->d_fileno-FD_STDIN] == NULL)
600 continue;
601 break;
602 }
603 bzero((caddr_t) dp, UIO_MX);
604 dp->d_fileno = dt->d_fileno;
605 dp->d_namlen = dt->d_namlen;
606 dp->d_type = DT_UNKNOWN;
607 dp->d_reclen = dt->d_reclen;
608 bcopy(dt->d_name, dp->d_name, dp->d_namlen+1);
609 error = uiomove((caddr_t) dp, UIO_MX, uio);
610 if (error)
611 break;
612 }
613 uio->uio_offset = i * UIO_MX;
614 return (error);
615 }
616
617 i = uio->uio_offset / UIO_MX;
618 error = 0;
619 while (uio->uio_resid > 0) {
620 if (i >= fdp->fd_nfiles)
621 break;
622
623 if (fdp->fd_ofiles[i] != NULL) {
624 struct dirent d;
625 struct dirent *dp = &d;
626
627 bzero((caddr_t) dp, UIO_MX);
628
629 dp->d_namlen = sprintf(dp->d_name, "%d", i);
630 dp->d_reclen = UIO_MX;
631 dp->d_type = DT_UNKNOWN;
632 dp->d_fileno = i + FD_STDIN;
633 /*
634 * And ship to userland
635 */
636 error = uiomove((caddr_t) dp, UIO_MX, uio);
637 if (error)
638 break;
639 }
640 i++;
641 }
642
643 uio->uio_offset = i * UIO_MX;
644 return (error);
645}
646
647int
648fdesc_readlink(ap)
649 struct vop_readlink_args /* {
650 struct vnode *a_vp;
651 struct uio *a_uio;
652 struct ucred *a_cred;
653 } */ *ap;
654{
655 struct vnode *vp = ap->a_vp;
656 int error;
657
658 if (vp->v_type != VLNK)
659 return (EPERM);
660
661 if (VTOFDESC(vp)->fd_type == Flink) {
662 char *ln = VTOFDESC(vp)->fd_link;
663 error = uiomove(ln, strlen(ln), ap->a_uio);
664 } else {
665 error = EOPNOTSUPP;
666 }
667
668 return (error);
669}
670
671int
672fdesc_read(ap)
673 struct vop_read_args /* {
674 struct vnode *a_vp;
675 struct uio *a_uio;
676 int a_ioflag;
677 struct ucred *a_cred;
678 } */ *ap;
679{
680 int error = EOPNOTSUPP;
681
682 switch (VTOFDESC(ap->a_vp)->fd_type) {
683 case Fctty:
684 error = cttyread(devctty, ap->a_uio, ap->a_ioflag);
685 break;
686
687 default:
688 error = EOPNOTSUPP;
689 break;
690 }
691
692 return (error);
693}
694
695int
696fdesc_write(ap)
697 struct vop_write_args /* {
698 struct vnode *a_vp;
699 struct uio *a_uio;
700 int a_ioflag;
701 struct ucred *a_cred;
702 } */ *ap;
703{
704 int error = EOPNOTSUPP;
705
706 switch (VTOFDESC(ap->a_vp)->fd_type) {
707 case Fctty:
708 error = cttywrite(devctty, ap->a_uio, ap->a_ioflag);
709 break;
710
711 default:
712 error = EOPNOTSUPP;
713 break;
714 }
715
716 return (error);
717}
718
719int
720fdesc_ioctl(ap)
721 struct vop_ioctl_args /* {
722 struct vnode *a_vp;
723 int a_command;
724 caddr_t a_data;
725 int a_fflag;
726 struct ucred *a_cred;
727 struct proc *a_p;
728 } */ *ap;
729{
730 int error = EOPNOTSUPP;
731
732 switch (VTOFDESC(ap->a_vp)->fd_type) {
733 case Fctty:
734 error = cttyioctl(devctty, ap->a_command, ap->a_data,
735 ap->a_fflag, ap->a_p);
736 break;
737
738 default:
739 error = EOPNOTSUPP;
740 break;
741 }
742
743 return (error);
744}
745
746int
747fdesc_select(ap)
748 struct vop_select_args /* {
749 struct vnode *a_vp;
750 int a_which;
751 int a_fflags;
752 struct ucred *a_cred;
753 struct proc *a_p;
754 } */ *ap;
755{
756 int error = EOPNOTSUPP;
757
758 switch (VTOFDESC(ap->a_vp)->fd_type) {
759 case Fctty:
760 error = cttyselect(devctty, ap->a_fflags, ap->a_p);
761 break;
762
763 default:
764 error = EOPNOTSUPP;
765 break;
766 }
767
768 return (error);
769}
770
771int
772fdesc_inactive(ap)
773 struct vop_inactive_args /* {
774 struct vnode *a_vp;
775 } */ *ap;
776{
777 struct vnode *vp = ap->a_vp;
778
779 /*
780 * Clear out the v_type field to avoid
781 * nasty things happening in vgone().
782 */
783 vp->v_type = VNON;
784 return (0);
785}
786
787int
788fdesc_reclaim(ap)
789 struct vop_reclaim_args /* {
790 struct vnode *a_vp;
791 } */ *ap;
792{
793 struct vnode *vp = ap->a_vp;
794
795 remque(VTOFDESC(vp));
796 FREE(vp->v_data, M_TEMP);
797 vp->v_data = 0;
798
799 return (0);
800}
801
802/*
803 * Return POSIX pathconf information applicable to special devices.
804 */
805int
806fdesc_pathconf(ap)
807 struct vop_pathconf_args /* {
808 struct vnode *a_vp;
809 int a_name;
810 int *a_retval;
811 } */ *ap;
812{
813
814 switch (ap->a_name) {
815 case _PC_LINK_MAX:
816 *ap->a_retval = LINK_MAX;
817 return (0);
818 case _PC_MAX_CANON:
819 *ap->a_retval = MAX_CANON;
820 return (0);
821 case _PC_MAX_INPUT:
822 *ap->a_retval = MAX_INPUT;
823 return (0);
824 case _PC_PIPE_BUF:
825 *ap->a_retval = PIPE_BUF;
826 return (0);
827 case _PC_CHOWN_RESTRICTED:
828 *ap->a_retval = 1;
829 return (0);
830 case _PC_VDISABLE:
831 *ap->a_retval = _POSIX_VDISABLE;
832 return (0);
833 default:
834 return (EINVAL);
835 }
836 /* NOTREACHED */
837}
838
839/*
840 * Print out the contents of a /dev/fd vnode.
841 */
842/* ARGSUSED */
843int
844fdesc_print(ap)
845 struct vop_print_args /* {
846 struct vnode *a_vp;
847 } */ *ap;
848{
849
850 printf("tag VT_NON, fdesc vnode\n");
851 return (0);
852}
853
854/*void*/
855int
856fdesc_vfree(ap)
857 struct vop_vfree_args /* {
858 struct vnode *a_pvp;
859 ino_t a_ino;
860 int a_mode;
861 } */ *ap;
862{
863
864 return (0);
865}
866
867/*
868 * /dev/fd vnode unsupported operation
869 */
870int
871fdesc_enotsupp()
872{
873
874 return (EOPNOTSUPP);
875}
876
877/*
878 * /dev/fd "should never get here" operation
879 */
880int
881fdesc_badop()
882{
883
884 panic("fdesc: bad op");
885 /* NOTREACHED */
886}
887
888/*
889 * /dev/fd vnode null operation
890 */
891int
892fdesc_nullop()
893{
894
895 return (0);
896}
897
898#define fdesc_create ((int (*) __P((struct vop_create_args *)))fdesc_enotsupp)
899#define fdesc_mknod ((int (*) __P((struct vop_mknod_args *)))fdesc_enotsupp)
900#define fdesc_close ((int (*) __P((struct vop_close_args *)))nullop)
901#define fdesc_access ((int (*) __P((struct vop_access_args *)))nullop)
902#define fdesc_mmap ((int (*) __P((struct vop_mmap_args *)))fdesc_enotsupp)
903#define fdesc_fsync ((int (*) __P((struct vop_fsync_args *)))nullop)
904#define fdesc_seek ((int (*) __P((struct vop_seek_args *)))nullop)
905#define fdesc_remove ((int (*) __P((struct vop_remove_args *)))fdesc_enotsupp)
906#define fdesc_link ((int (*) __P((struct vop_link_args *)))fdesc_enotsupp)
907#define fdesc_rename ((int (*) __P((struct vop_rename_args *)))fdesc_enotsupp)
908#define fdesc_mkdir ((int (*) __P((struct vop_mkdir_args *)))fdesc_enotsupp)
909#define fdesc_rmdir ((int (*) __P((struct vop_rmdir_args *)))fdesc_enotsupp)
910#define fdesc_symlink ((int (*) __P((struct vop_symlink_args *)))fdesc_enotsupp)
911#define fdesc_abortop ((int (*) __P((struct vop_abortop_args *)))nullop)
912#define fdesc_lock ((int (*) __P((struct vop_lock_args *)))nullop)
913#define fdesc_unlock ((int (*) __P((struct vop_unlock_args *)))nullop)
914#define fdesc_bmap ((int (*) __P((struct vop_bmap_args *)))fdesc_badop)
915#define fdesc_strategy ((int (*) __P((struct vop_strategy_args *)))fdesc_badop)
916#define fdesc_islocked ((int (*) __P((struct vop_islocked_args *)))nullop)
917#define fdesc_advlock ((int (*) __P((struct vop_advlock_args *)))fdesc_enotsupp)
918#define fdesc_blkatoff \
919 ((int (*) __P((struct vop_blkatoff_args *)))fdesc_enotsupp)
920#define fdesc_vget ((int (*) __P((struct vop_vget_args *)))fdesc_enotsupp)
921#define fdesc_valloc ((int(*) __P(( \
922 struct vnode *pvp, \
923 int mode, \
924 struct ucred *cred, \
925 struct vnode **vpp))) fdesc_enotsupp)
926#define fdesc_truncate \
927 ((int (*) __P((struct vop_truncate_args *)))fdesc_enotsupp)
928#define fdesc_update ((int (*) __P((struct vop_update_args *)))fdesc_enotsupp)
929#define fdesc_bwrite ((int (*) __P((struct vop_bwrite_args *)))fdesc_enotsupp)
930
931int (**fdesc_vnodeop_p)();
932struct vnodeopv_entry_desc fdesc_vnodeop_entries[] = {
933 { &vop_default_desc, vn_default_error },
934 { &vop_lookup_desc, fdesc_lookup }, /* lookup */
935 { &vop_create_desc, fdesc_create }, /* create */
936 { &vop_mknod_desc, fdesc_mknod }, /* mknod */
937 { &vop_open_desc, fdesc_open }, /* open */
938 { &vop_close_desc, fdesc_close }, /* close */
939 { &vop_access_desc, fdesc_access }, /* access */
940 { &vop_getattr_desc, fdesc_getattr }, /* getattr */
941 { &vop_setattr_desc, fdesc_setattr }, /* setattr */
942 { &vop_read_desc, fdesc_read }, /* read */
943 { &vop_write_desc, fdesc_write }, /* write */
944 { &vop_ioctl_desc, fdesc_ioctl }, /* ioctl */
945 { &vop_select_desc, fdesc_select }, /* select */
946 { &vop_mmap_desc, fdesc_mmap }, /* mmap */
947 { &vop_fsync_desc, fdesc_fsync }, /* fsync */
948 { &vop_seek_desc, fdesc_seek }, /* seek */
949 { &vop_remove_desc, fdesc_remove }, /* remove */
950 { &vop_link_desc, fdesc_link }, /* link */
951 { &vop_rename_desc, fdesc_rename }, /* rename */
952 { &vop_mkdir_desc, fdesc_mkdir }, /* mkdir */
953 { &vop_rmdir_desc, fdesc_rmdir }, /* rmdir */
954 { &vop_symlink_desc, fdesc_symlink }, /* symlink */
955 { &vop_readdir_desc, fdesc_readdir }, /* readdir */
956 { &vop_readlink_desc, fdesc_readlink }, /* readlink */
957 { &vop_abortop_desc, fdesc_abortop }, /* abortop */
958 { &vop_inactive_desc, fdesc_inactive }, /* inactive */
959 { &vop_reclaim_desc, fdesc_reclaim }, /* reclaim */
960 { &vop_lock_desc, fdesc_lock }, /* lock */
961 { &vop_unlock_desc, fdesc_unlock }, /* unlock */
962 { &vop_bmap_desc, fdesc_bmap }, /* bmap */
963 { &vop_strategy_desc, fdesc_strategy }, /* strategy */
964 { &vop_print_desc, fdesc_print }, /* print */
965 { &vop_islocked_desc, fdesc_islocked }, /* islocked */
966 { &vop_pathconf_desc, fdesc_pathconf }, /* pathconf */
967 { &vop_advlock_desc, fdesc_advlock }, /* advlock */
968 { &vop_blkatoff_desc, fdesc_blkatoff }, /* blkatoff */
969 { &vop_valloc_desc, fdesc_valloc }, /* valloc */
970 { &vop_vfree_desc, fdesc_vfree }, /* vfree */
971 { &vop_truncate_desc, fdesc_truncate }, /* truncate */
972 { &vop_update_desc, fdesc_update }, /* update */
973 { &vop_bwrite_desc, fdesc_bwrite }, /* bwrite */
974 { (struct vnodeop_desc*)NULL, (int(*)())NULL }
975};
976struct vnodeopv_desc fdesc_vnodeop_opv_desc =
977 { &fdesc_vnodeop_p, fdesc_vnodeop_entries };
| 39 */
40
41/*
42 * /dev/fd Filesystem
43 */
44
45#include <sys/param.h>
46#include <sys/systm.h>
47#include <sys/types.h>
48#include <sys/time.h>
49#include <sys/proc.h>
50#include <sys/kernel.h> /* boottime */
51#include <sys/resourcevar.h>
52#include <sys/filedesc.h>
53#include <sys/vnode.h>
54#include <sys/malloc.h>
55#include <sys/file.h>
56#include <sys/stat.h>
57#include <sys/mount.h>
58#include <sys/namei.h>
59#include <sys/buf.h>
60#include <sys/dirent.h>
61#include <miscfs/fdesc/fdesc.h>
62
63#define cttyvp(p) ((p)->p_flag & P_CONTROLT ? (p)->p_session->s_ttyvp : NULL)
64
65#define FDL_WANT 0x01
66#define FDL_LOCKED 0x02
67static int fdcache_lock;
68
69dev_t devctty;
70
71#if (FD_STDIN != FD_STDOUT-1) || (FD_STDOUT != FD_STDERR-1)
72FD_STDIN, FD_STDOUT, FD_STDERR must be a sequence n, n+1, n+2
73#endif
74
75#define NFDCACHE 4
76#define FD_NHASH(ix) ((ix) & NFDCACHE-1)
77
78/*
79 * Cache head
80 */
81struct fdcache {
82 struct fdescnode *fc_forw;
83 struct fdescnode *fc_back;
84};
85
86static struct fdcache fdcache[NFDCACHE];
87
88/*
89 * Initialise cache headers
90 */
91int
92fdesc_init()
93{
94 struct fdcache *fc;
95
96 devctty = makedev(nchrdev, 0);
97
98 for (fc = fdcache; fc < fdcache + NFDCACHE; fc++)
99 fc->fc_forw = fc->fc_back = (struct fdescnode *) fc;
100 return (0);
101}
102
103/*
104 * Compute hash list for given target vnode
105 */
106static struct fdcache *
107fdesc_hash(ix)
108 int ix;
109{
110
111 return (&fdcache[FD_NHASH(ix)]);
112}
113
114int
115fdesc_allocvp(ftype, ix, mp, vpp)
116 fdntype ftype;
117 int ix;
118 struct mount *mp;
119 struct vnode **vpp;
120{
121 struct fdcache *fc;
122 struct fdescnode *fd;
123 int error = 0;
124
125loop:
126 fc = fdesc_hash(ix);
127 for (fd = fc->fc_forw; fd != (struct fdescnode *) fc; fd = fd->fd_forw) {
128 if (fd->fd_ix == ix && fd->fd_vnode->v_mount == mp) {
129 if (vget(fd->fd_vnode, 0))
130 goto loop;
131 *vpp = fd->fd_vnode;
132 return (error);
133 }
134 }
135
136 /*
137 * otherwise lock the array while we call getnewvnode
138 * since that can block.
139 */
140 if (fdcache_lock & FDL_LOCKED) {
141 fdcache_lock |= FDL_WANT;
142 sleep((caddr_t) &fdcache_lock, PINOD);
143 goto loop;
144 }
145 fdcache_lock |= FDL_LOCKED;
146
147 error = getnewvnode(VT_FDESC, mp, fdesc_vnodeop_p, vpp);
148 if (error)
149 goto out;
150 MALLOC(fd, void *, sizeof(struct fdescnode), M_TEMP, M_WAITOK);
151 (*vpp)->v_data = fd;
152 fd->fd_vnode = *vpp;
153 fd->fd_type = ftype;
154 fd->fd_fd = -1;
155 fd->fd_link = 0;
156 fd->fd_ix = ix;
157 fc = fdesc_hash(ix);
158 insque(fd, fc);
159
160out:;
161 fdcache_lock &= ~FDL_LOCKED;
162
163 if (fdcache_lock & FDL_WANT) {
164 fdcache_lock &= ~FDL_WANT;
165 wakeup((caddr_t) &fdcache_lock);
166 }
167
168 return (error);
169}
170
171/*
172 * vp is the current namei directory
173 * ndp is the name to locate in that directory...
174 */
175int
176fdesc_lookup(ap)
177 struct vop_lookup_args /* {
178 struct vnode * a_dvp;
179 struct vnode ** a_vpp;
180 struct componentname * a_cnp;
181 } */ *ap;
182{
183 struct vnode **vpp = ap->a_vpp;
184 struct vnode *dvp = ap->a_dvp;
185 char *pname;
186 struct proc *p;
187 int nfiles;
188 unsigned fd = 0;
189 int error;
190 struct vnode *fvp;
191 char *ln;
192
193 pname = ap->a_cnp->cn_nameptr;
194 if (ap->a_cnp->cn_namelen == 1 && *pname == '.') {
195 *vpp = dvp;
196 VREF(dvp);
197 VOP_LOCK(dvp);
198 return (0);
199 }
200
201 p = ap->a_cnp->cn_proc;
202 nfiles = p->p_fd->fd_nfiles;
203
204 switch (VTOFDESC(dvp)->fd_type) {
205 default:
206 case Flink:
207 case Fdesc:
208 case Fctty:
209 error = ENOTDIR;
210 goto bad;
211
212 case Froot:
213 if (ap->a_cnp->cn_namelen == 2 && bcmp(pname, "fd", 2) == 0) {
214 error = fdesc_allocvp(Fdevfd, FD_DEVFD, dvp->v_mount, &fvp);
215 if (error)
216 goto bad;
217 *vpp = fvp;
218 fvp->v_type = VDIR;
219 VOP_LOCK(fvp);
220 return (0);
221 }
222
223 if (ap->a_cnp->cn_namelen == 3 && bcmp(pname, "tty", 3) == 0) {
224 struct vnode *ttyvp = cttyvp(p);
225 if (ttyvp == NULL) {
226 error = ENXIO;
227 goto bad;
228 }
229 error = fdesc_allocvp(Fctty, FD_CTTY, dvp->v_mount, &fvp);
230 if (error)
231 goto bad;
232 *vpp = fvp;
233 fvp->v_type = VFIFO;
234 VOP_LOCK(fvp);
235 return (0);
236 }
237
238 ln = 0;
239 switch (ap->a_cnp->cn_namelen) {
240 case 5:
241 if (bcmp(pname, "stdin", 5) == 0) {
242 ln = "fd/0";
243 fd = FD_STDIN;
244 }
245 break;
246 case 6:
247 if (bcmp(pname, "stdout", 6) == 0) {
248 ln = "fd/1";
249 fd = FD_STDOUT;
250 } else
251 if (bcmp(pname, "stderr", 6) == 0) {
252 ln = "fd/2";
253 fd = FD_STDERR;
254 }
255 break;
256 }
257
258 if (ln) {
259 error = fdesc_allocvp(Flink, fd, dvp->v_mount, &fvp);
260 if (error)
261 goto bad;
262 VTOFDESC(fvp)->fd_link = ln;
263 *vpp = fvp;
264 fvp->v_type = VLNK;
265 VOP_LOCK(fvp);
266 return (0);
267 } else {
268 error = ENOENT;
269 goto bad;
270 }
271
272 /* FALL THROUGH */
273
274 case Fdevfd:
275 if (ap->a_cnp->cn_namelen == 2 && bcmp(pname, "..", 2) == 0) {
276 error = fdesc_root(dvp->v_mount, vpp);
277 return (error);
278 }
279
280 fd = 0;
281 while (*pname >= '0' && *pname <= '9') {
282 fd = 10 * fd + *pname++ - '0';
283 if (fd >= nfiles)
284 break;
285 }
286
287 if (*pname != '\0') {
288 error = ENOENT;
289 goto bad;
290 }
291
292 if (fd >= nfiles || p->p_fd->fd_ofiles[fd] == NULL) {
293 error = EBADF;
294 goto bad;
295 }
296
297 error = fdesc_allocvp(Fdesc, FD_DESC+fd, dvp->v_mount, &fvp);
298 if (error)
299 goto bad;
300 VTOFDESC(fvp)->fd_fd = fd;
301 *vpp = fvp;
302 return (0);
303 }
304
305bad:;
306 *vpp = NULL;
307 return (error);
308}
309
310int
311fdesc_open(ap)
312 struct vop_open_args /* {
313 struct vnode *a_vp;
314 int a_mode;
315 struct ucred *a_cred;
316 struct proc *a_p;
317 } */ *ap;
318{
319 struct vnode *vp = ap->a_vp;
320 int error = 0;
321
322 switch (VTOFDESC(vp)->fd_type) {
323 case Fdesc:
324 /*
325 * XXX Kludge: set p->p_dupfd to contain the value of the
326 * the file descriptor being sought for duplication. The error
327 * return ensures that the vnode for this device will be
328 * released by vn_open. Open will detect this special error and
329 * take the actions in dupfdopen. Other callers of vn_open or
330 * VOP_OPEN will simply report the error.
331 */
332 ap->a_p->p_dupfd = VTOFDESC(vp)->fd_fd; /* XXX */
333 error = ENODEV;
334 break;
335
336 case Fctty:
337 error = cttyopen(devctty, ap->a_mode, 0, ap->a_p);
338 break;
339 }
340
341 return (error);
342}
343
344static int
345fdesc_attr(fd, vap, cred, p)
346 int fd;
347 struct vattr *vap;
348 struct ucred *cred;
349 struct proc *p;
350{
351 struct filedesc *fdp = p->p_fd;
352 struct file *fp;
353 struct stat stb;
354 int error;
355
356 if (fd >= fdp->fd_nfiles || (fp = fdp->fd_ofiles[fd]) == NULL)
357 return (EBADF);
358
359 switch (fp->f_type) {
360 case DTYPE_VNODE:
361 error = VOP_GETATTR((struct vnode *) fp->f_data, vap, cred, p);
362 if (error == 0 && vap->va_type == VDIR) {
363 /*
364 * don't allow directories to show up because
365 * that causes loops in the namespace.
366 */
367 vap->va_type = VFIFO;
368 }
369 break;
370
371 case DTYPE_SOCKET:
372 error = soo_stat((struct socket *)fp->f_data, &stb);
373 if (error == 0) {
374 vattr_null(vap);
375 vap->va_type = VSOCK;
376 vap->va_mode = stb.st_mode;
377 vap->va_nlink = stb.st_nlink;
378 vap->va_uid = stb.st_uid;
379 vap->va_gid = stb.st_gid;
380 vap->va_fsid = stb.st_dev;
381 vap->va_fileid = stb.st_ino;
382 vap->va_size = stb.st_size;
383 vap->va_blocksize = stb.st_blksize;
384 vap->va_atime = stb.st_atimespec;
385 vap->va_mtime = stb.st_mtimespec;
386 vap->va_ctime = stb.st_ctimespec;
387 vap->va_gen = stb.st_gen;
388 vap->va_flags = stb.st_flags;
389 vap->va_rdev = stb.st_rdev;
390 vap->va_bytes = stb.st_blocks * stb.st_blksize;
391 }
392 break;
393
394 default:
395 panic("fdesc attr");
396 break;
397 }
398
399 return (error);
400}
401
402int
403fdesc_getattr(ap)
404 struct vop_getattr_args /* {
405 struct vnode *a_vp;
406 struct vattr *a_vap;
407 struct ucred *a_cred;
408 struct proc *a_p;
409 } */ *ap;
410{
411 struct vnode *vp = ap->a_vp;
412 struct vattr *vap = ap->a_vap;
413 unsigned fd;
414 int error = 0;
415
416 switch (VTOFDESC(vp)->fd_type) {
417 case Froot:
418 case Fdevfd:
419 case Flink:
420 case Fctty:
421 bzero((caddr_t) vap, sizeof(*vap));
422 vattr_null(vap);
423 vap->va_fileid = VTOFDESC(vp)->fd_ix;
424
425 switch (VTOFDESC(vp)->fd_type) {
426 case Flink:
427 vap->va_mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
428 vap->va_type = VLNK;
429 vap->va_nlink = 1;
430 vap->va_size = strlen(VTOFDESC(vp)->fd_link);
431 break;
432
433 case Fctty:
434 vap->va_mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH;
435 vap->va_type = VFIFO;
436 vap->va_nlink = 1;
437 vap->va_size = 0;
438 break;
439
440 default:
441 vap->va_mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
442 vap->va_type = VDIR;
443 vap->va_nlink = 2;
444 vap->va_size = DEV_BSIZE;
445 break;
446 }
447 vap->va_uid = 0;
448 vap->va_gid = 0;
449 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
450 vap->va_blocksize = DEV_BSIZE;
451 vap->va_atime.ts_sec = boottime.tv_sec;
452 vap->va_atime.ts_nsec = 0;
453 vap->va_mtime = vap->va_atime;
454 vap->va_ctime = vap->va_mtime;
455 vap->va_gen = 0;
456 vap->va_flags = 0;
457 vap->va_rdev = 0;
458 vap->va_bytes = 0;
459 break;
460
461 case Fdesc:
462 fd = VTOFDESC(vp)->fd_fd;
463 error = fdesc_attr(fd, vap, ap->a_cred, ap->a_p);
464 break;
465
466 default:
467 panic("fdesc_getattr");
468 break;
469 }
470
471 if (error == 0)
472 vp->v_type = vap->va_type;
473
474 return (error);
475}
476
477int
478fdesc_setattr(ap)
479 struct vop_setattr_args /* {
480 struct vnode *a_vp;
481 struct vattr *a_vap;
482 struct ucred *a_cred;
483 struct proc *a_p;
484 } */ *ap;
485{
486 struct filedesc *fdp = ap->a_p->p_fd;
487 struct file *fp;
488 unsigned fd;
489 int error;
490
491 /*
492 * Can't mess with the root vnode
493 */
494 switch (VTOFDESC(ap->a_vp)->fd_type) {
495 case Fdesc:
496 break;
497
498 case Fctty:
499 return (0);
500
501 default:
502 return (EACCES);
503 }
504
505 fd = VTOFDESC(ap->a_vp)->fd_fd;
506 if (fd >= fdp->fd_nfiles || (fp = fdp->fd_ofiles[fd]) == NULL) {
507 return (EBADF);
508 }
509
510 /*
511 * Can setattr the underlying vnode, but not sockets!
512 */
513 switch (fp->f_type) {
514 case DTYPE_VNODE:
515 error = VOP_SETATTR((struct vnode *) fp->f_data, ap->a_vap, ap->a_cred, ap->a_p);
516 break;
517
518 case DTYPE_SOCKET:
519 error = 0;
520 break;
521
522 default:
523 error = EBADF;
524 break;
525 }
526
527 return (error);
528}
529
530#define UIO_MX 16
531
532static struct dirtmp {
533 u_long d_fileno;
534 u_short d_reclen;
535 u_short d_namlen;
536 char d_name[8];
537} rootent[] = {
538 { FD_DEVFD, UIO_MX, 2, "fd" },
539 { FD_STDIN, UIO_MX, 5, "stdin" },
540 { FD_STDOUT, UIO_MX, 6, "stdout" },
541 { FD_STDERR, UIO_MX, 6, "stderr" },
542 { FD_CTTY, UIO_MX, 3, "tty" },
543 { 0 }
544};
545
546int
547fdesc_readdir(ap)
548 struct vop_readdir_args /* {
549 struct vnode *a_vp;
550 struct uio *a_uio;
551 struct ucred *a_cred;
552 } */ *ap;
553{
554 struct uio *uio = ap->a_uio;
555 struct filedesc *fdp;
556 int i;
557 int error;
558
559 switch (VTOFDESC(ap->a_vp)->fd_type) {
560 case Fctty:
561 return (0);
562
563 case Fdesc:
564 return (ENOTDIR);
565
566 default:
567 break;
568 }
569
570 fdp = uio->uio_procp->p_fd;
571
572 if (VTOFDESC(ap->a_vp)->fd_type == Froot) {
573 struct dirent d;
574 struct dirent *dp = &d;
575 struct dirtmp *dt;
576
577 i = uio->uio_offset / UIO_MX;
578 error = 0;
579
580 while (uio->uio_resid > 0) {
581 dt = &rootent[i];
582 if (dt->d_fileno == 0) {
583 /**eofflagp = 1;*/
584 break;
585 }
586 i++;
587
588 switch (dt->d_fileno) {
589 case FD_CTTY:
590 if (cttyvp(uio->uio_procp) == NULL)
591 continue;
592 break;
593
594 case FD_STDIN:
595 case FD_STDOUT:
596 case FD_STDERR:
597 if ((dt->d_fileno-FD_STDIN) >= fdp->fd_nfiles)
598 continue;
599 if (fdp->fd_ofiles[dt->d_fileno-FD_STDIN] == NULL)
600 continue;
601 break;
602 }
603 bzero((caddr_t) dp, UIO_MX);
604 dp->d_fileno = dt->d_fileno;
605 dp->d_namlen = dt->d_namlen;
606 dp->d_type = DT_UNKNOWN;
607 dp->d_reclen = dt->d_reclen;
608 bcopy(dt->d_name, dp->d_name, dp->d_namlen+1);
609 error = uiomove((caddr_t) dp, UIO_MX, uio);
610 if (error)
611 break;
612 }
613 uio->uio_offset = i * UIO_MX;
614 return (error);
615 }
616
617 i = uio->uio_offset / UIO_MX;
618 error = 0;
619 while (uio->uio_resid > 0) {
620 if (i >= fdp->fd_nfiles)
621 break;
622
623 if (fdp->fd_ofiles[i] != NULL) {
624 struct dirent d;
625 struct dirent *dp = &d;
626
627 bzero((caddr_t) dp, UIO_MX);
628
629 dp->d_namlen = sprintf(dp->d_name, "%d", i);
630 dp->d_reclen = UIO_MX;
631 dp->d_type = DT_UNKNOWN;
632 dp->d_fileno = i + FD_STDIN;
633 /*
634 * And ship to userland
635 */
636 error = uiomove((caddr_t) dp, UIO_MX, uio);
637 if (error)
638 break;
639 }
640 i++;
641 }
642
643 uio->uio_offset = i * UIO_MX;
644 return (error);
645}
646
647int
648fdesc_readlink(ap)
649 struct vop_readlink_args /* {
650 struct vnode *a_vp;
651 struct uio *a_uio;
652 struct ucred *a_cred;
653 } */ *ap;
654{
655 struct vnode *vp = ap->a_vp;
656 int error;
657
658 if (vp->v_type != VLNK)
659 return (EPERM);
660
661 if (VTOFDESC(vp)->fd_type == Flink) {
662 char *ln = VTOFDESC(vp)->fd_link;
663 error = uiomove(ln, strlen(ln), ap->a_uio);
664 } else {
665 error = EOPNOTSUPP;
666 }
667
668 return (error);
669}
670
671int
672fdesc_read(ap)
673 struct vop_read_args /* {
674 struct vnode *a_vp;
675 struct uio *a_uio;
676 int a_ioflag;
677 struct ucred *a_cred;
678 } */ *ap;
679{
680 int error = EOPNOTSUPP;
681
682 switch (VTOFDESC(ap->a_vp)->fd_type) {
683 case Fctty:
684 error = cttyread(devctty, ap->a_uio, ap->a_ioflag);
685 break;
686
687 default:
688 error = EOPNOTSUPP;
689 break;
690 }
691
692 return (error);
693}
694
695int
696fdesc_write(ap)
697 struct vop_write_args /* {
698 struct vnode *a_vp;
699 struct uio *a_uio;
700 int a_ioflag;
701 struct ucred *a_cred;
702 } */ *ap;
703{
704 int error = EOPNOTSUPP;
705
706 switch (VTOFDESC(ap->a_vp)->fd_type) {
707 case Fctty:
708 error = cttywrite(devctty, ap->a_uio, ap->a_ioflag);
709 break;
710
711 default:
712 error = EOPNOTSUPP;
713 break;
714 }
715
716 return (error);
717}
718
719int
720fdesc_ioctl(ap)
721 struct vop_ioctl_args /* {
722 struct vnode *a_vp;
723 int a_command;
724 caddr_t a_data;
725 int a_fflag;
726 struct ucred *a_cred;
727 struct proc *a_p;
728 } */ *ap;
729{
730 int error = EOPNOTSUPP;
731
732 switch (VTOFDESC(ap->a_vp)->fd_type) {
733 case Fctty:
734 error = cttyioctl(devctty, ap->a_command, ap->a_data,
735 ap->a_fflag, ap->a_p);
736 break;
737
738 default:
739 error = EOPNOTSUPP;
740 break;
741 }
742
743 return (error);
744}
745
746int
747fdesc_select(ap)
748 struct vop_select_args /* {
749 struct vnode *a_vp;
750 int a_which;
751 int a_fflags;
752 struct ucred *a_cred;
753 struct proc *a_p;
754 } */ *ap;
755{
756 int error = EOPNOTSUPP;
757
758 switch (VTOFDESC(ap->a_vp)->fd_type) {
759 case Fctty:
760 error = cttyselect(devctty, ap->a_fflags, ap->a_p);
761 break;
762
763 default:
764 error = EOPNOTSUPP;
765 break;
766 }
767
768 return (error);
769}
770
771int
772fdesc_inactive(ap)
773 struct vop_inactive_args /* {
774 struct vnode *a_vp;
775 } */ *ap;
776{
777 struct vnode *vp = ap->a_vp;
778
779 /*
780 * Clear out the v_type field to avoid
781 * nasty things happening in vgone().
782 */
783 vp->v_type = VNON;
784 return (0);
785}
786
787int
788fdesc_reclaim(ap)
789 struct vop_reclaim_args /* {
790 struct vnode *a_vp;
791 } */ *ap;
792{
793 struct vnode *vp = ap->a_vp;
794
795 remque(VTOFDESC(vp));
796 FREE(vp->v_data, M_TEMP);
797 vp->v_data = 0;
798
799 return (0);
800}
801
802/*
803 * Return POSIX pathconf information applicable to special devices.
804 */
805int
806fdesc_pathconf(ap)
807 struct vop_pathconf_args /* {
808 struct vnode *a_vp;
809 int a_name;
810 int *a_retval;
811 } */ *ap;
812{
813
814 switch (ap->a_name) {
815 case _PC_LINK_MAX:
816 *ap->a_retval = LINK_MAX;
817 return (0);
818 case _PC_MAX_CANON:
819 *ap->a_retval = MAX_CANON;
820 return (0);
821 case _PC_MAX_INPUT:
822 *ap->a_retval = MAX_INPUT;
823 return (0);
824 case _PC_PIPE_BUF:
825 *ap->a_retval = PIPE_BUF;
826 return (0);
827 case _PC_CHOWN_RESTRICTED:
828 *ap->a_retval = 1;
829 return (0);
830 case _PC_VDISABLE:
831 *ap->a_retval = _POSIX_VDISABLE;
832 return (0);
833 default:
834 return (EINVAL);
835 }
836 /* NOTREACHED */
837}
838
839/*
840 * Print out the contents of a /dev/fd vnode.
841 */
842/* ARGSUSED */
843int
844fdesc_print(ap)
845 struct vop_print_args /* {
846 struct vnode *a_vp;
847 } */ *ap;
848{
849
850 printf("tag VT_NON, fdesc vnode\n");
851 return (0);
852}
853
854/*void*/
855int
856fdesc_vfree(ap)
857 struct vop_vfree_args /* {
858 struct vnode *a_pvp;
859 ino_t a_ino;
860 int a_mode;
861 } */ *ap;
862{
863
864 return (0);
865}
866
867/*
868 * /dev/fd vnode unsupported operation
869 */
870int
871fdesc_enotsupp()
872{
873
874 return (EOPNOTSUPP);
875}
876
877/*
878 * /dev/fd "should never get here" operation
879 */
880int
881fdesc_badop()
882{
883
884 panic("fdesc: bad op");
885 /* NOTREACHED */
886}
887
888/*
889 * /dev/fd vnode null operation
890 */
891int
892fdesc_nullop()
893{
894
895 return (0);
896}
897
898#define fdesc_create ((int (*) __P((struct vop_create_args *)))fdesc_enotsupp)
899#define fdesc_mknod ((int (*) __P((struct vop_mknod_args *)))fdesc_enotsupp)
900#define fdesc_close ((int (*) __P((struct vop_close_args *)))nullop)
901#define fdesc_access ((int (*) __P((struct vop_access_args *)))nullop)
902#define fdesc_mmap ((int (*) __P((struct vop_mmap_args *)))fdesc_enotsupp)
903#define fdesc_fsync ((int (*) __P((struct vop_fsync_args *)))nullop)
904#define fdesc_seek ((int (*) __P((struct vop_seek_args *)))nullop)
905#define fdesc_remove ((int (*) __P((struct vop_remove_args *)))fdesc_enotsupp)
906#define fdesc_link ((int (*) __P((struct vop_link_args *)))fdesc_enotsupp)
907#define fdesc_rename ((int (*) __P((struct vop_rename_args *)))fdesc_enotsupp)
908#define fdesc_mkdir ((int (*) __P((struct vop_mkdir_args *)))fdesc_enotsupp)
909#define fdesc_rmdir ((int (*) __P((struct vop_rmdir_args *)))fdesc_enotsupp)
910#define fdesc_symlink ((int (*) __P((struct vop_symlink_args *)))fdesc_enotsupp)
911#define fdesc_abortop ((int (*) __P((struct vop_abortop_args *)))nullop)
912#define fdesc_lock ((int (*) __P((struct vop_lock_args *)))nullop)
913#define fdesc_unlock ((int (*) __P((struct vop_unlock_args *)))nullop)
914#define fdesc_bmap ((int (*) __P((struct vop_bmap_args *)))fdesc_badop)
915#define fdesc_strategy ((int (*) __P((struct vop_strategy_args *)))fdesc_badop)
916#define fdesc_islocked ((int (*) __P((struct vop_islocked_args *)))nullop)
917#define fdesc_advlock ((int (*) __P((struct vop_advlock_args *)))fdesc_enotsupp)
918#define fdesc_blkatoff \
919 ((int (*) __P((struct vop_blkatoff_args *)))fdesc_enotsupp)
920#define fdesc_vget ((int (*) __P((struct vop_vget_args *)))fdesc_enotsupp)
921#define fdesc_valloc ((int(*) __P(( \
922 struct vnode *pvp, \
923 int mode, \
924 struct ucred *cred, \
925 struct vnode **vpp))) fdesc_enotsupp)
926#define fdesc_truncate \
927 ((int (*) __P((struct vop_truncate_args *)))fdesc_enotsupp)
928#define fdesc_update ((int (*) __P((struct vop_update_args *)))fdesc_enotsupp)
929#define fdesc_bwrite ((int (*) __P((struct vop_bwrite_args *)))fdesc_enotsupp)
930
931int (**fdesc_vnodeop_p)();
932struct vnodeopv_entry_desc fdesc_vnodeop_entries[] = {
933 { &vop_default_desc, vn_default_error },
934 { &vop_lookup_desc, fdesc_lookup }, /* lookup */
935 { &vop_create_desc, fdesc_create }, /* create */
936 { &vop_mknod_desc, fdesc_mknod }, /* mknod */
937 { &vop_open_desc, fdesc_open }, /* open */
938 { &vop_close_desc, fdesc_close }, /* close */
939 { &vop_access_desc, fdesc_access }, /* access */
940 { &vop_getattr_desc, fdesc_getattr }, /* getattr */
941 { &vop_setattr_desc, fdesc_setattr }, /* setattr */
942 { &vop_read_desc, fdesc_read }, /* read */
943 { &vop_write_desc, fdesc_write }, /* write */
944 { &vop_ioctl_desc, fdesc_ioctl }, /* ioctl */
945 { &vop_select_desc, fdesc_select }, /* select */
946 { &vop_mmap_desc, fdesc_mmap }, /* mmap */
947 { &vop_fsync_desc, fdesc_fsync }, /* fsync */
948 { &vop_seek_desc, fdesc_seek }, /* seek */
949 { &vop_remove_desc, fdesc_remove }, /* remove */
950 { &vop_link_desc, fdesc_link }, /* link */
951 { &vop_rename_desc, fdesc_rename }, /* rename */
952 { &vop_mkdir_desc, fdesc_mkdir }, /* mkdir */
953 { &vop_rmdir_desc, fdesc_rmdir }, /* rmdir */
954 { &vop_symlink_desc, fdesc_symlink }, /* symlink */
955 { &vop_readdir_desc, fdesc_readdir }, /* readdir */
956 { &vop_readlink_desc, fdesc_readlink }, /* readlink */
957 { &vop_abortop_desc, fdesc_abortop }, /* abortop */
958 { &vop_inactive_desc, fdesc_inactive }, /* inactive */
959 { &vop_reclaim_desc, fdesc_reclaim }, /* reclaim */
960 { &vop_lock_desc, fdesc_lock }, /* lock */
961 { &vop_unlock_desc, fdesc_unlock }, /* unlock */
962 { &vop_bmap_desc, fdesc_bmap }, /* bmap */
963 { &vop_strategy_desc, fdesc_strategy }, /* strategy */
964 { &vop_print_desc, fdesc_print }, /* print */
965 { &vop_islocked_desc, fdesc_islocked }, /* islocked */
966 { &vop_pathconf_desc, fdesc_pathconf }, /* pathconf */
967 { &vop_advlock_desc, fdesc_advlock }, /* advlock */
968 { &vop_blkatoff_desc, fdesc_blkatoff }, /* blkatoff */
969 { &vop_valloc_desc, fdesc_valloc }, /* valloc */
970 { &vop_vfree_desc, fdesc_vfree }, /* vfree */
971 { &vop_truncate_desc, fdesc_truncate }, /* truncate */
972 { &vop_update_desc, fdesc_update }, /* update */
973 { &vop_bwrite_desc, fdesc_bwrite }, /* bwrite */
974 { (struct vnodeop_desc*)NULL, (int(*)())NULL }
975};
976struct vnodeopv_desc fdesc_vnodeop_opv_desc =
977 { &fdesc_vnodeop_p, fdesc_vnodeop_entries };
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