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76434cf5 JSP |
1 | /* |
2 | * Copyright (c) 1993 The Regents of the University of California. | |
3 | * Copyright (c) 1993 Jan-Simon Pendry | |
4 | * All rights reserved. | |
5 | * | |
6 | * This code is derived from software contributed to Berkeley by | |
7 | * Jan-Simon Pendry. | |
8 | * | |
9 | * %sccs.include.redist.c% | |
10 | * | |
5d86e205 | 11 | * @(#)procfs_vnops.c 8.2 (Berkeley) %G% |
76434cf5 JSP |
12 | * |
13 | * From: | |
14 | * $Id: procfs_vnops.c,v 3.2 1993/12/15 09:40:17 jsp Exp $ | |
15 | */ | |
16 | ||
17 | /* | |
18 | * procfs vnode interface | |
19 | */ | |
20 | ||
21 | #include <sys/param.h> | |
22 | #include <sys/systm.h> | |
23 | #include <sys/time.h> | |
24 | #include <sys/kernel.h> | |
25 | #include <sys/file.h> | |
26 | #include <sys/proc.h> | |
27 | #include <sys/vnode.h> | |
28 | #include <sys/namei.h> | |
29 | #include <sys/malloc.h> | |
30 | #include <sys/dirent.h> | |
31 | #include <sys/resourcevar.h> | |
32 | #include <miscfs/procfs/procfs.h> | |
33 | #include <vm/vm.h> /* for PAGE_SIZE */ | |
34 | ||
35 | /* | |
36 | * Vnode Operations. | |
37 | * | |
38 | */ | |
39 | ||
40 | /* | |
41 | * This is a list of the valid names in the | |
42 | * process-specific sub-directories. It is | |
43 | * used in procfs_lookup and procfs_readdir | |
44 | */ | |
45 | static struct pfsnames { | |
46 | u_short d_namlen; | |
47 | char d_name[PROCFS_NAMELEN]; | |
48 | pfstype d_pfstype; | |
49 | } procent[] = { | |
50 | #define N(s) sizeof(s)-1, s | |
51 | /* namlen, nam, type */ | |
52 | { N("file"), Pfile }, | |
53 | { N("mem"), Pmem }, | |
54 | { N("regs"), Pregs }, | |
55 | { N("ctl"), Pctl }, | |
56 | { N("status"), Pstatus }, | |
57 | { N("note"), Pnote }, | |
58 | { N("notepg"), Pnotepg }, | |
59 | #undef N | |
60 | }; | |
61 | #define Nprocent (sizeof(procent)/sizeof(procent[0])) | |
62 | ||
63 | static pid_t atopid __P((const char *, u_int)); | |
64 | ||
65 | /* | |
66 | * set things up for doing i/o on | |
67 | * the pfsnode (vp). (vp) is locked | |
68 | * on entry, and should be left locked | |
69 | * on exit. | |
70 | * | |
71 | * for procfs we don't need to do anything | |
72 | * in particular for i/o. all that is done | |
73 | * is to support exclusive open on process | |
74 | * memory images. | |
75 | */ | |
76 | procfs_open(ap) | |
77 | struct vop_open_args *ap; | |
78 | { | |
79 | struct pfsnode *pfs = VTOPFS(ap->a_vp); | |
80 | ||
81 | switch (pfs->pfs_type) { | |
82 | case Pmem: | |
83 | if (PFIND(pfs->pfs_pid) == 0) | |
84 | return (ENOENT); /* was ESRCH, jsp */ | |
85 | ||
86 | if ((pfs->pfs_flags & FWRITE) && (ap->a_mode & O_EXCL) || | |
87 | (pfs->pfs_flags & O_EXCL) && (ap->a_mode & FWRITE)) | |
88 | return (EBUSY); | |
89 | ||
90 | ||
91 | if (ap->a_mode & FWRITE) | |
92 | pfs->pfs_flags = ap->a_mode & (FWRITE|O_EXCL); | |
93 | ||
94 | return (0); | |
95 | ||
96 | default: | |
97 | break; | |
98 | } | |
99 | ||
100 | return (0); | |
101 | } | |
102 | ||
103 | /* | |
104 | * close the pfsnode (vp) after doing i/o. | |
105 | * (vp) is not locked on entry or exit. | |
106 | * | |
107 | * nothing to do for procfs other than undo | |
108 | * any exclusive open flag (see _open above). | |
109 | */ | |
110 | procfs_close(ap) | |
111 | struct vop_close_args *ap; | |
112 | { | |
113 | struct pfsnode *pfs = VTOPFS(ap->a_vp); | |
114 | ||
115 | switch (pfs->pfs_type) { | |
116 | case Pmem: | |
117 | if ((ap->a_fflag & FWRITE) && (pfs->pfs_flags & O_EXCL)) | |
118 | pfs->pfs_flags &= ~(FWRITE|O_EXCL); | |
119 | break; | |
120 | } | |
121 | ||
122 | return (0); | |
123 | } | |
124 | ||
125 | /* | |
126 | * do an ioctl operation on pfsnode (vp). | |
127 | * (vp) is not locked on entry or exit. | |
128 | */ | |
129 | procfs_ioctl(ap) | |
130 | struct vop_ioctl_args *ap; | |
131 | { | |
132 | ||
133 | return (ENOTTY); | |
134 | } | |
135 | ||
136 | /* | |
137 | * do block mapping for pfsnode (vp). | |
138 | * since we don't use the buffer cache | |
139 | * for procfs this function should never | |
140 | * be called. in any case, it's not clear | |
141 | * what part of the kernel ever makes use | |
142 | * of this function. for sanity, this is the | |
143 | * usual no-op bmap, although returning | |
144 | * (EIO) would be a reasonable alternative. | |
145 | */ | |
146 | procfs_bmap(ap) | |
147 | struct vop_bmap_args *ap; | |
148 | { | |
149 | ||
150 | if (ap->a_vpp != NULL) | |
151 | *ap->a_vpp = ap->a_vp; | |
152 | if (ap->a_bnp != NULL) | |
153 | *ap->a_bnp = ap->a_bn; | |
154 | return (0); | |
155 | } | |
156 | ||
157 | /* | |
158 | * _inactive is called when the pfsnode | |
159 | * is vrele'd and the reference count goes | |
160 | * to zero. (vp) will be on the vnode free | |
161 | * list, so to get it back vget() must be | |
162 | * used. | |
163 | * | |
164 | * for procfs, check if the process is still | |
165 | * alive and if it isn't then just throw away | |
166 | * the vnode by calling vgone(). this may | |
167 | * be overkill and a waste of time since the | |
168 | * chances are that the process will still be | |
169 | * there and PFIND is not free. | |
170 | * | |
171 | * (vp) is not locked on entry or exit. | |
172 | */ | |
173 | procfs_inactive(ap) | |
174 | struct vop_inactive_args *ap; | |
175 | { | |
176 | struct pfsnode *pfs = VTOPFS(ap->a_vp); | |
177 | ||
178 | if (PFIND(pfs->pfs_pid) == 0) | |
179 | vgone(ap->a_vp); | |
180 | ||
181 | return (0); | |
182 | } | |
183 | ||
184 | /* | |
185 | * _reclaim is called when getnewvnode() | |
186 | * wants to make use of an entry on the vnode | |
187 | * free list. at this time the filesystem needs | |
188 | * to free any private data and remove the node | |
189 | * from any private lists. | |
190 | */ | |
191 | procfs_reclaim(ap) | |
192 | struct vop_reclaim_args *ap; | |
193 | { | |
194 | int error; | |
195 | ||
196 | error = procfs_freevp(ap->a_vp); | |
197 | return (error); | |
198 | } | |
199 | ||
200 | /* | |
201 | * _print is used for debugging. | |
202 | * just print a readable description | |
203 | * of (vp). | |
204 | */ | |
205 | procfs_print(ap) | |
206 | struct vop_print_args *ap; | |
207 | { | |
208 | struct pfsnode *pfs = VTOPFS(ap->a_vp); | |
209 | ||
210 | printf("tag VT_PROCFS, pid %d, mode %x, flags %x\n", | |
211 | pfs->pfs_pid, | |
212 | pfs->pfs_mode, pfs->pfs_flags); | |
213 | } | |
214 | ||
215 | /* | |
216 | * _abortop is called when operations such as | |
217 | * rename and create fail. this entry is responsible | |
218 | * for undoing any side-effects caused by the lookup. | |
219 | * this will always include freeing the pathname buffer. | |
220 | */ | |
221 | procfs_abortop(ap) | |
222 | struct vop_abortop_args *ap; | |
223 | { | |
224 | ||
225 | if ((ap->a_cnp->cn_flags & (HASBUF | SAVESTART)) == HASBUF) | |
226 | FREE(ap->a_cnp->cn_pnbuf, M_NAMEI); | |
227 | return (0); | |
228 | } | |
229 | ||
230 | /* | |
231 | * generic entry point for unsupported operations | |
232 | */ | |
233 | procfs_badop() | |
234 | { | |
235 | ||
236 | return (EIO); | |
237 | } | |
238 | ||
239 | /* | |
240 | * Invent attributes for pfsnode (vp) and store | |
241 | * them in (vap). | |
242 | * Directories lengths are returned as zero since | |
243 | * any real length would require the genuine size | |
244 | * to be computed, and nothing cares anyway. | |
245 | * | |
246 | * this is relatively minimal for procfs. | |
247 | */ | |
248 | procfs_getattr(ap) | |
249 | struct vop_getattr_args *ap; | |
250 | { | |
251 | struct pfsnode *pfs = VTOPFS(ap->a_vp); | |
5d86e205 | 252 | struct vattr *vap = ap->a_vap; |
76434cf5 JSP |
253 | struct proc *procp; |
254 | int error; | |
255 | ||
256 | /* first check the process still exists */ | |
257 | procp = PFIND(pfs->pfs_pid); | |
258 | if (procp == 0) | |
259 | return (ENOENT); | |
260 | ||
261 | error = 0; | |
262 | ||
263 | /* start by zeroing out the attributes */ | |
5d86e205 | 264 | VATTR_NULL(vap); |
76434cf5 JSP |
265 | |
266 | /* next do all the common fields */ | |
5d86e205 JSP |
267 | vap->va_type = ap->a_vp->v_type; |
268 | vap->va_mode = pfs->pfs_mode; | |
269 | vap->va_fileid = pfs->pfs_fileno; | |
270 | vap->va_flags = 0; | |
271 | vap->va_blocksize = PAGE_SIZE; | |
272 | vap->va_bytes = vap->va_size = 0; | |
76434cf5 JSP |
273 | |
274 | /* | |
275 | * Make all times be current TOD. | |
276 | * It would be possible to get the process start | |
277 | * time from the p_stat structure, but there's | |
278 | * no "file creation" time stamp anyway, and the | |
279 | * p_stat structure is not addressible if u. gets | |
280 | * swapped out for that process. | |
281 | */ | |
5d86e205 JSP |
282 | microtime(&vap->va_ctime); |
283 | vap->va_atime = vap->va_mtime = vap->va_ctime; | |
76434cf5 JSP |
284 | |
285 | /* | |
286 | * now do the object specific fields | |
287 | * | |
288 | * The size could be set from struct reg, but it's hardly | |
289 | * worth the trouble, and it puts some (potentially) machine | |
290 | * dependent data into this machine-independent code. If it | |
291 | * becomes important then this function should break out into | |
292 | * a per-file stat function in the corresponding .c file. | |
293 | */ | |
294 | ||
295 | switch (pfs->pfs_type) { | |
296 | case Proot: | |
5d86e205 JSP |
297 | vap->va_nlink = 2; |
298 | vap->va_uid = 0; | |
299 | vap->va_gid = 0; | |
76434cf5 JSP |
300 | break; |
301 | ||
302 | case Pproc: | |
5d86e205 JSP |
303 | vap->va_nlink = 2; |
304 | vap->va_uid = procp->p_ucred->cr_uid; | |
305 | vap->va_gid = procp->p_ucred->cr_gid; | |
76434cf5 JSP |
306 | break; |
307 | ||
308 | case Pfile: | |
309 | error = EOPNOTSUPP; | |
310 | break; | |
311 | ||
312 | case Pmem: | |
5d86e205 JSP |
313 | vap->va_nlink = 1; |
314 | vap->va_bytes = vap->va_size = | |
76434cf5 JSP |
315 | ctob(procp->p_vmspace->vm_tsize + |
316 | procp->p_vmspace->vm_dsize + | |
317 | procp->p_vmspace->vm_ssize); | |
5d86e205 JSP |
318 | vap->va_uid = procp->p_ucred->cr_uid; |
319 | vap->va_gid = procp->p_ucred->cr_gid; | |
76434cf5 JSP |
320 | break; |
321 | ||
322 | case Pregs: | |
323 | case Pctl: | |
324 | case Pstatus: | |
325 | case Pnote: | |
326 | case Pnotepg: | |
5d86e205 JSP |
327 | vap->va_nlink = 1; |
328 | vap->va_uid = procp->p_ucred->cr_uid; | |
329 | vap->va_gid = procp->p_ucred->cr_gid; | |
76434cf5 JSP |
330 | break; |
331 | ||
332 | default: | |
333 | panic("procfs_getattr"); | |
334 | } | |
335 | ||
336 | return (error); | |
337 | } | |
338 | ||
339 | procfs_setattr(ap) | |
340 | struct vop_setattr_args *ap; | |
341 | { | |
342 | /* | |
343 | * just fake out attribute setting | |
344 | * it's not good to generate an error | |
345 | * return, otherwise things like creat() | |
346 | * will fail when they try to set the | |
347 | * file length to 0. worse, this means | |
348 | * that echo $note > /proc/$pid/note will fail. | |
349 | */ | |
350 | ||
351 | return (0); | |
352 | } | |
353 | ||
354 | /* | |
355 | * implement access checking. | |
356 | * | |
357 | * something very similar to this code is duplicated | |
358 | * throughout the 4bsd kernel and should be moved | |
359 | * into kern/vfs_subr.c sometime. | |
360 | * | |
361 | * actually, the check for super-user is slightly | |
362 | * broken since it will allow read access to write-only | |
363 | * objects. this doesn't cause any particular trouble | |
364 | * but does mean that the i/o entry points need to check | |
365 | * that the operation really does make sense. | |
366 | */ | |
367 | procfs_access(ap) | |
368 | struct vop_access_args *ap; | |
369 | { | |
370 | struct vattr *vap; | |
371 | struct vattr vattr; | |
372 | int error; | |
373 | ||
374 | /* | |
375 | * If you're the super-user, | |
376 | * you always get access. | |
377 | */ | |
378 | if (ap->a_cred->cr_uid == (uid_t) 0) | |
379 | return (0); | |
380 | vap = &vattr; | |
381 | if (error = VOP_GETATTR(ap->a_vp, vap, ap->a_cred, ap->a_p)) | |
382 | return (error); | |
383 | ||
384 | /* | |
385 | * Access check is based on only one of owner, group, public. | |
386 | * If not owner, then check group. If not a member of the | |
387 | * group, then check public access. | |
388 | */ | |
389 | if (ap->a_cred->cr_uid != vap->va_uid) { | |
390 | gid_t *gp; | |
391 | int i; | |
392 | ||
393 | (ap->a_mode) >>= 3; | |
394 | gp = ap->a_cred->cr_groups; | |
395 | for (i = 0; i < ap->a_cred->cr_ngroups; i++, gp++) | |
396 | if (vap->va_gid == *gp) | |
397 | goto found; | |
398 | ap->a_mode >>= 3; | |
399 | found: | |
400 | ; | |
401 | } | |
402 | ||
403 | if ((vap->va_mode & ap->a_mode) == ap->a_mode) | |
404 | return (0); | |
405 | ||
406 | return (EACCES); | |
407 | } | |
408 | ||
409 | /* | |
410 | * lookup. this is incredibly complicated in the | |
411 | * general case, however for most pseudo-filesystems | |
412 | * very little needs to be done. | |
413 | * | |
414 | * unless you want to get a migraine, just make sure your | |
415 | * filesystem doesn't do any locking of its own. otherwise | |
416 | * read and inwardly digest ufs_lookup(). | |
417 | */ | |
418 | procfs_lookup(ap) | |
419 | struct vop_lookup_args *ap; | |
420 | { | |
421 | struct componentname *cnp = ap->a_cnp; | |
422 | struct vnode **vpp = ap->a_vpp; | |
423 | struct vnode *dvp = ap->a_dvp; | |
424 | char *pname = cnp->cn_nameptr; | |
425 | int error = 0; | |
426 | int flag; | |
427 | pid_t pid; | |
428 | struct vnode *nvp; | |
429 | struct pfsnode *pfs; | |
430 | struct proc *procp; | |
431 | int mode; | |
432 | pfstype pfs_type; | |
433 | int i; | |
434 | ||
435 | if (cnp->cn_namelen == 1 && *pname == '.') { | |
436 | *vpp = dvp; | |
437 | VREF(dvp); | |
438 | /*VOP_LOCK(dvp);*/ | |
439 | return (0); | |
440 | } | |
441 | ||
442 | *vpp = NULL; | |
443 | ||
444 | pfs = VTOPFS(dvp); | |
445 | switch (pfs->pfs_type) { | |
446 | case Proot: | |
447 | if (cnp->cn_flags & ISDOTDOT) | |
448 | return (EIO); | |
449 | ||
450 | if (CNEQ(cnp, "curproc", 7)) | |
451 | pid = cnp->cn_proc->p_pid; | |
452 | else | |
453 | pid = atopid(pname, cnp->cn_namelen); | |
454 | if (pid == NO_PID) | |
455 | return (ENOENT); | |
456 | ||
457 | procp = PFIND(pid); | |
458 | if (procp == 0) | |
459 | return (ENOENT); | |
460 | ||
461 | error = procfs_allocvp(dvp->v_mount, &nvp, pid, Pproc); | |
462 | if (error) | |
463 | return (error); | |
464 | ||
465 | nvp->v_type = VDIR; | |
466 | pfs = VTOPFS(nvp); | |
467 | ||
468 | *vpp = nvp; | |
469 | return (0); | |
470 | ||
471 | case Pproc: | |
472 | if (cnp->cn_flags & ISDOTDOT) { | |
473 | error = procfs_root(dvp->v_mount, vpp); | |
474 | return (error); | |
475 | } | |
476 | ||
477 | procp = PFIND(pfs->pfs_pid); | |
478 | if (procp == 0) | |
479 | return (ENOENT); | |
480 | ||
481 | for (i = 0; i < Nprocent; i++) { | |
482 | struct pfsnames *dp = &procent[i]; | |
483 | ||
484 | if (cnp->cn_namelen == dp->d_namlen && | |
485 | bcmp(pname, dp->d_name, dp->d_namlen) == 0) { | |
486 | pfs_type = dp->d_pfstype; | |
487 | goto found; | |
488 | } | |
489 | } | |
490 | return (ENOENT); | |
491 | ||
492 | found: | |
493 | if (pfs_type == Pfile) { | |
494 | nvp = procfs_findtextvp(procp); | |
495 | if (nvp) { | |
496 | VREF(nvp); | |
497 | VOP_LOCK(nvp); | |
498 | } else { | |
499 | error = ENXIO; | |
500 | } | |
501 | } else { | |
502 | error = procfs_allocvp(dvp->v_mount, &nvp, | |
503 | pfs->pfs_pid, pfs_type); | |
504 | if (error) | |
505 | return (error); | |
506 | ||
507 | nvp->v_type = VREG; | |
508 | pfs = VTOPFS(nvp); | |
509 | } | |
510 | *vpp = nvp; | |
511 | return (error); | |
512 | ||
513 | default: | |
514 | return (ENOTDIR); | |
515 | } | |
516 | } | |
517 | ||
518 | /* | |
519 | * readdir returns directory entries from pfsnode (vp). | |
520 | * | |
521 | * the strategy here with procfs is to generate a single | |
522 | * directory entry at a time (struct pfsdent) and then | |
523 | * copy that out to userland using uiomove. a more efficent | |
524 | * though more complex implementation, would try to minimize | |
525 | * the number of calls to uiomove(). for procfs, this is | |
526 | * hardly worth the added code complexity. | |
527 | * | |
528 | * this should just be done through read() | |
529 | */ | |
530 | procfs_readdir(ap) | |
531 | struct vop_readdir_args *ap; | |
532 | { | |
533 | struct uio *uio = ap->a_uio; | |
534 | struct pfsdent d; | |
535 | struct pfsdent *dp = &d; | |
536 | struct pfsnode *pfs; | |
537 | int error; | |
538 | int count; | |
539 | int i; | |
540 | ||
541 | pfs = VTOPFS(ap->a_vp); | |
542 | ||
543 | if (uio->uio_resid < UIO_MX) | |
544 | return (EINVAL); | |
545 | if (uio->uio_offset & (UIO_MX-1)) | |
546 | return (EINVAL); | |
547 | if (uio->uio_offset < 0) | |
548 | return (EINVAL); | |
549 | ||
550 | error = 0; | |
551 | count = 0; | |
552 | i = uio->uio_offset / UIO_MX; | |
553 | ||
554 | switch (pfs->pfs_type) { | |
555 | /* | |
556 | * this is for the process-specific sub-directories. | |
557 | * all that is needed to is copy out all the entries | |
558 | * from the procent[] table (top of this file). | |
559 | */ | |
560 | case Pproc: { | |
561 | while (uio->uio_resid >= UIO_MX) { | |
562 | struct pfsnames *dt; | |
563 | ||
564 | if (i >= Nprocent) | |
565 | break; | |
566 | ||
567 | dt = &procent[i]; | |
568 | ||
569 | dp->d_reclen = UIO_MX; | |
570 | dp->d_fileno = PROCFS_FILENO(pfs->pfs_pid, dt->d_pfstype); | |
571 | dp->d_type = DT_REG; | |
572 | dp->d_namlen = dt->d_namlen; | |
573 | bcopy(dt->d_name, dp->d_name, sizeof(dt->d_name)-1); | |
574 | error = uiomove((caddr_t) dp, UIO_MX, uio); | |
575 | if (error) | |
576 | break; | |
577 | count += UIO_MX; | |
578 | i++; | |
579 | } | |
580 | ||
581 | break; | |
582 | ||
583 | } | |
584 | ||
585 | /* | |
586 | * this is for the root of the procfs filesystem | |
587 | * what is needed is a special entry for "curproc" | |
588 | * followed by an entry for each process on allproc | |
589 | #ifdef PROCFS_ZOMBIE | |
590 | * and zombproc. | |
591 | #endif | |
592 | */ | |
593 | ||
594 | case Proot: { | |
595 | int pcnt; | |
596 | #ifdef PROCFS_ZOMBIE | |
597 | int doingzomb = 0; | |
598 | #endif | |
599 | volatile struct proc *p; | |
600 | ||
601 | p = allproc; | |
602 | ||
603 | #define PROCFS_XFILES 1 /* number of other entries, like "curproc" */ | |
604 | pcnt = PROCFS_XFILES; | |
605 | ||
606 | while (p && uio->uio_resid >= UIO_MX) { | |
607 | bzero((char *) dp, UIO_MX); | |
608 | dp->d_type = DT_DIR; | |
609 | dp->d_reclen = UIO_MX; | |
610 | ||
611 | switch (i) { | |
612 | case 0: | |
613 | /* ship out entry for "curproc" */ | |
614 | dp->d_fileno = PROCFS_FILENO(PID_MAX+1, Pproc); | |
5d86e205 | 615 | dp->d_namlen = sprintf(dp->d_name, "curproc"); |
76434cf5 JSP |
616 | break; |
617 | ||
618 | default: | |
619 | if (pcnt >= i) { | |
620 | dp->d_fileno = PROCFS_FILENO(p->p_pid, Pproc); | |
621 | dp->d_namlen = sprintf(dp->d_name, "%ld", (long) p->p_pid); | |
622 | } | |
623 | ||
624 | p = p->p_next; | |
625 | ||
626 | #ifdef PROCFS_ZOMBIE | |
627 | if (p == 0 && doingzomb == 0) { | |
628 | doingzomb = 1; | |
629 | p = zombproc; | |
630 | } | |
631 | #endif | |
632 | ||
633 | if (pcnt++ < i) | |
634 | continue; | |
635 | ||
636 | break; | |
637 | } | |
638 | error = uiomove((caddr_t) dp, UIO_MX, uio); | |
639 | if (error) | |
640 | break; | |
641 | count += UIO_MX; | |
642 | i++; | |
643 | } | |
644 | ||
645 | break; | |
646 | ||
647 | } | |
648 | ||
649 | default: | |
650 | error = ENOTDIR; | |
651 | break; | |
652 | } | |
653 | ||
654 | uio->uio_offset = i * UIO_MX; | |
655 | ||
656 | return (error); | |
657 | } | |
658 | ||
659 | /* | |
660 | * convert decimal ascii to pid_t | |
661 | */ | |
662 | static pid_t | |
663 | atopid(b, len) | |
664 | const char *b; | |
665 | u_int len; | |
666 | { | |
667 | pid_t p = 0; | |
668 | ||
669 | while (len--) { | |
670 | char c = *b++; | |
671 | if (c < '0' || c > '9') | |
672 | return (NO_PID); | |
673 | p = 10 * p + (c - '0'); | |
674 | if (p > PID_MAX) | |
675 | return (NO_PID); | |
676 | } | |
677 | ||
678 | return (p); | |
679 | } | |
680 | ||
681 | /* | |
682 | * procfs vnode operations. | |
683 | */ | |
684 | int (**procfs_vnodeop_p)(); | |
685 | struct vnodeopv_entry_desc procfs_vnodeop_entries[] = { | |
686 | { &vop_default_desc, vn_default_error }, | |
687 | { &vop_lookup_desc, procfs_lookup }, /* lookup */ | |
688 | { &vop_create_desc, procfs_create }, /* create */ | |
689 | { &vop_mknod_desc, procfs_mknod }, /* mknod */ | |
690 | { &vop_open_desc, procfs_open }, /* open */ | |
691 | { &vop_close_desc, procfs_close }, /* close */ | |
692 | { &vop_access_desc, procfs_access }, /* access */ | |
693 | { &vop_getattr_desc, procfs_getattr }, /* getattr */ | |
694 | { &vop_setattr_desc, procfs_setattr }, /* setattr */ | |
695 | { &vop_read_desc, procfs_read }, /* read */ | |
696 | { &vop_write_desc, procfs_write }, /* write */ | |
697 | { &vop_ioctl_desc, procfs_ioctl }, /* ioctl */ | |
698 | { &vop_select_desc, procfs_select }, /* select */ | |
699 | { &vop_mmap_desc, procfs_mmap }, /* mmap */ | |
700 | { &vop_fsync_desc, procfs_fsync }, /* fsync */ | |
701 | { &vop_seek_desc, procfs_seek }, /* seek */ | |
702 | { &vop_remove_desc, procfs_remove }, /* remove */ | |
703 | { &vop_link_desc, procfs_link }, /* link */ | |
704 | { &vop_rename_desc, procfs_rename }, /* rename */ | |
705 | { &vop_mkdir_desc, procfs_mkdir }, /* mkdir */ | |
706 | { &vop_rmdir_desc, procfs_rmdir }, /* rmdir */ | |
707 | { &vop_symlink_desc, procfs_symlink }, /* symlink */ | |
708 | { &vop_readdir_desc, procfs_readdir }, /* readdir */ | |
709 | { &vop_readlink_desc, procfs_readlink }, /* readlink */ | |
710 | { &vop_abortop_desc, procfs_abortop }, /* abortop */ | |
711 | { &vop_inactive_desc, procfs_inactive }, /* inactive */ | |
712 | { &vop_reclaim_desc, procfs_reclaim }, /* reclaim */ | |
713 | { &vop_lock_desc, procfs_lock }, /* lock */ | |
714 | { &vop_unlock_desc, procfs_unlock }, /* unlock */ | |
715 | { &vop_bmap_desc, procfs_bmap }, /* bmap */ | |
716 | { &vop_strategy_desc, procfs_strategy }, /* strategy */ | |
717 | { &vop_print_desc, procfs_print }, /* print */ | |
718 | { &vop_islocked_desc, procfs_islocked }, /* islocked */ | |
719 | { &vop_pathconf_desc, procfs_pathconf }, /* pathconf */ | |
720 | { &vop_advlock_desc, procfs_advlock }, /* advlock */ | |
721 | { &vop_blkatoff_desc, procfs_blkatoff }, /* blkatoff */ | |
722 | { &vop_valloc_desc, procfs_valloc }, /* valloc */ | |
723 | { &vop_vfree_desc, procfs_vfree }, /* vfree */ | |
724 | { &vop_truncate_desc, procfs_truncate }, /* truncate */ | |
725 | { &vop_update_desc, procfs_update }, /* update */ | |
726 | { (struct vnodeop_desc*)NULL, (int(*)())NULL } | |
727 | }; | |
728 | struct vnodeopv_desc procfs_vnodeop_opv_desc = | |
729 | { &procfs_vnodeop_p, procfs_vnodeop_entries }; |