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76434cf5 | 1 | /* |
76434cf5 | 2 | * Copyright (c) 1993 Jan-Simon Pendry |
1611db1e KB |
3 | * Copyright (c) 1993 |
4 | * The Regents of the University of California. All rights reserved. | |
76434cf5 JSP |
5 | * |
6 | * This code is derived from software contributed to Berkeley by | |
7 | * Jan-Simon Pendry. | |
8 | * | |
9 | * %sccs.include.redist.c% | |
10 | * | |
6583aa28 | 11 | * @(#)procfs_vnops.c 8.6 (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 */ | |
6fdd7e21 JSP |
52 | { N("file"), Pfile }, |
53 | { N("mem"), Pmem }, | |
54 | { N("regs"), Pregs }, | |
55 | { N("fpregs"), Pfpregs }, | |
56 | { N("ctl"), Pctl }, | |
57 | { N("status"), Pstatus }, | |
58 | { N("note"), Pnote }, | |
59 | { N("notepg"), Pnotepg }, | |
76434cf5 JSP |
60 | #undef N |
61 | }; | |
62 | #define Nprocent (sizeof(procent)/sizeof(procent[0])) | |
63 | ||
64 | static pid_t atopid __P((const char *, u_int)); | |
65 | ||
66 | /* | |
67 | * set things up for doing i/o on | |
68 | * the pfsnode (vp). (vp) is locked | |
69 | * on entry, and should be left locked | |
70 | * on exit. | |
71 | * | |
72 | * for procfs we don't need to do anything | |
73 | * in particular for i/o. all that is done | |
74 | * is to support exclusive open on process | |
75 | * memory images. | |
76 | */ | |
77 | procfs_open(ap) | |
78 | struct vop_open_args *ap; | |
79 | { | |
80 | struct pfsnode *pfs = VTOPFS(ap->a_vp); | |
81 | ||
82 | switch (pfs->pfs_type) { | |
83 | case Pmem: | |
84 | if (PFIND(pfs->pfs_pid) == 0) | |
85 | return (ENOENT); /* was ESRCH, jsp */ | |
86 | ||
87 | if ((pfs->pfs_flags & FWRITE) && (ap->a_mode & O_EXCL) || | |
88 | (pfs->pfs_flags & O_EXCL) && (ap->a_mode & FWRITE)) | |
89 | return (EBUSY); | |
90 | ||
91 | ||
92 | if (ap->a_mode & FWRITE) | |
93 | pfs->pfs_flags = ap->a_mode & (FWRITE|O_EXCL); | |
94 | ||
95 | return (0); | |
96 | ||
97 | default: | |
98 | break; | |
99 | } | |
100 | ||
101 | return (0); | |
102 | } | |
103 | ||
104 | /* | |
105 | * close the pfsnode (vp) after doing i/o. | |
106 | * (vp) is not locked on entry or exit. | |
107 | * | |
108 | * nothing to do for procfs other than undo | |
109 | * any exclusive open flag (see _open above). | |
110 | */ | |
111 | procfs_close(ap) | |
112 | struct vop_close_args *ap; | |
113 | { | |
114 | struct pfsnode *pfs = VTOPFS(ap->a_vp); | |
115 | ||
116 | switch (pfs->pfs_type) { | |
117 | case Pmem: | |
118 | if ((ap->a_fflag & FWRITE) && (pfs->pfs_flags & O_EXCL)) | |
119 | pfs->pfs_flags &= ~(FWRITE|O_EXCL); | |
120 | break; | |
121 | } | |
122 | ||
123 | return (0); | |
124 | } | |
125 | ||
126 | /* | |
127 | * do an ioctl operation on pfsnode (vp). | |
128 | * (vp) is not locked on entry or exit. | |
129 | */ | |
130 | procfs_ioctl(ap) | |
131 | struct vop_ioctl_args *ap; | |
132 | { | |
133 | ||
134 | return (ENOTTY); | |
135 | } | |
136 | ||
137 | /* | |
138 | * do block mapping for pfsnode (vp). | |
139 | * since we don't use the buffer cache | |
140 | * for procfs this function should never | |
141 | * be called. in any case, it's not clear | |
142 | * what part of the kernel ever makes use | |
143 | * of this function. for sanity, this is the | |
144 | * usual no-op bmap, although returning | |
145 | * (EIO) would be a reasonable alternative. | |
146 | */ | |
147 | procfs_bmap(ap) | |
148 | struct vop_bmap_args *ap; | |
149 | { | |
150 | ||
151 | if (ap->a_vpp != NULL) | |
152 | *ap->a_vpp = ap->a_vp; | |
153 | if (ap->a_bnp != NULL) | |
154 | *ap->a_bnp = ap->a_bn; | |
155 | return (0); | |
156 | } | |
157 | ||
158 | /* | |
159 | * _inactive is called when the pfsnode | |
160 | * is vrele'd and the reference count goes | |
161 | * to zero. (vp) will be on the vnode free | |
162 | * list, so to get it back vget() must be | |
163 | * used. | |
164 | * | |
165 | * for procfs, check if the process is still | |
166 | * alive and if it isn't then just throw away | |
167 | * the vnode by calling vgone(). this may | |
168 | * be overkill and a waste of time since the | |
169 | * chances are that the process will still be | |
170 | * there and PFIND is not free. | |
171 | * | |
172 | * (vp) is not locked on entry or exit. | |
173 | */ | |
174 | procfs_inactive(ap) | |
175 | struct vop_inactive_args *ap; | |
176 | { | |
177 | struct pfsnode *pfs = VTOPFS(ap->a_vp); | |
178 | ||
179 | if (PFIND(pfs->pfs_pid) == 0) | |
180 | vgone(ap->a_vp); | |
181 | ||
182 | return (0); | |
183 | } | |
184 | ||
185 | /* | |
186 | * _reclaim is called when getnewvnode() | |
187 | * wants to make use of an entry on the vnode | |
188 | * free list. at this time the filesystem needs | |
189 | * to free any private data and remove the node | |
190 | * from any private lists. | |
191 | */ | |
192 | procfs_reclaim(ap) | |
193 | struct vop_reclaim_args *ap; | |
194 | { | |
195 | int error; | |
196 | ||
197 | error = procfs_freevp(ap->a_vp); | |
198 | return (error); | |
199 | } | |
200 | ||
0020ca6e JSP |
201 | /* |
202 | * Return POSIX pathconf information applicable to special devices. | |
203 | */ | |
204 | procfs_pathconf(ap) | |
205 | struct vop_pathconf_args /* { | |
206 | struct vnode *a_vp; | |
207 | int a_name; | |
208 | int *a_retval; | |
209 | } */ *ap; | |
210 | { | |
211 | ||
212 | switch (ap->a_name) { | |
213 | case _PC_LINK_MAX: | |
214 | *ap->a_retval = LINK_MAX; | |
215 | return (0); | |
216 | case _PC_MAX_CANON: | |
217 | *ap->a_retval = MAX_CANON; | |
218 | return (0); | |
219 | case _PC_MAX_INPUT: | |
220 | *ap->a_retval = MAX_INPUT; | |
221 | return (0); | |
222 | case _PC_PIPE_BUF: | |
223 | *ap->a_retval = PIPE_BUF; | |
224 | return (0); | |
225 | case _PC_CHOWN_RESTRICTED: | |
226 | *ap->a_retval = 1; | |
227 | return (0); | |
228 | case _PC_VDISABLE: | |
229 | *ap->a_retval = _POSIX_VDISABLE; | |
230 | return (0); | |
231 | default: | |
232 | return (EINVAL); | |
233 | } | |
234 | /* NOTREACHED */ | |
235 | } | |
236 | ||
76434cf5 JSP |
237 | /* |
238 | * _print is used for debugging. | |
239 | * just print a readable description | |
240 | * of (vp). | |
241 | */ | |
242 | procfs_print(ap) | |
243 | struct vop_print_args *ap; | |
244 | { | |
245 | struct pfsnode *pfs = VTOPFS(ap->a_vp); | |
246 | ||
247 | printf("tag VT_PROCFS, pid %d, mode %x, flags %x\n", | |
248 | pfs->pfs_pid, | |
249 | pfs->pfs_mode, pfs->pfs_flags); | |
250 | } | |
251 | ||
252 | /* | |
253 | * _abortop is called when operations such as | |
254 | * rename and create fail. this entry is responsible | |
255 | * for undoing any side-effects caused by the lookup. | |
256 | * this will always include freeing the pathname buffer. | |
257 | */ | |
258 | procfs_abortop(ap) | |
259 | struct vop_abortop_args *ap; | |
260 | { | |
261 | ||
262 | if ((ap->a_cnp->cn_flags & (HASBUF | SAVESTART)) == HASBUF) | |
263 | FREE(ap->a_cnp->cn_pnbuf, M_NAMEI); | |
264 | return (0); | |
265 | } | |
266 | ||
267 | /* | |
268 | * generic entry point for unsupported operations | |
269 | */ | |
270 | procfs_badop() | |
271 | { | |
272 | ||
273 | return (EIO); | |
274 | } | |
275 | ||
276 | /* | |
277 | * Invent attributes for pfsnode (vp) and store | |
278 | * them in (vap). | |
279 | * Directories lengths are returned as zero since | |
280 | * any real length would require the genuine size | |
281 | * to be computed, and nothing cares anyway. | |
282 | * | |
283 | * this is relatively minimal for procfs. | |
284 | */ | |
285 | procfs_getattr(ap) | |
286 | struct vop_getattr_args *ap; | |
287 | { | |
288 | struct pfsnode *pfs = VTOPFS(ap->a_vp); | |
5d86e205 | 289 | struct vattr *vap = ap->a_vap; |
76434cf5 JSP |
290 | struct proc *procp; |
291 | int error; | |
292 | ||
293 | /* first check the process still exists */ | |
6583aa28 JSP |
294 | switch (pfs->pfs_type) { |
295 | case Proot: | |
296 | procp = 0; | |
297 | break; | |
298 | ||
299 | default: | |
300 | procp = PFIND(pfs->pfs_pid); | |
301 | if (procp == 0) | |
302 | return (ENOENT); | |
303 | } | |
76434cf5 JSP |
304 | |
305 | error = 0; | |
306 | ||
307 | /* start by zeroing out the attributes */ | |
5d86e205 | 308 | VATTR_NULL(vap); |
76434cf5 JSP |
309 | |
310 | /* next do all the common fields */ | |
5d86e205 JSP |
311 | vap->va_type = ap->a_vp->v_type; |
312 | vap->va_mode = pfs->pfs_mode; | |
313 | vap->va_fileid = pfs->pfs_fileno; | |
314 | vap->va_flags = 0; | |
315 | vap->va_blocksize = PAGE_SIZE; | |
316 | vap->va_bytes = vap->va_size = 0; | |
76434cf5 | 317 | |
6583aa28 JSP |
318 | /* |
319 | * If the process has exercised some setuid or setgid | |
320 | * privilege, then rip away read/write permission so | |
321 | * that only root can gain access. | |
322 | */ | |
323 | switch (pfs->pfs_type) { | |
324 | case Pregs: | |
325 | case Pfpregs: | |
326 | case Pmem: | |
327 | if (procp->p_flag & P_SUGID) | |
328 | vap->va_mode &= ~((VREAD|VWRITE)| | |
329 | ((VREAD|VWRITE)>>3)| | |
330 | ((VREAD|VWRITE)>>6)); | |
331 | break; | |
332 | } | |
333 | ||
76434cf5 JSP |
334 | /* |
335 | * Make all times be current TOD. | |
336 | * It would be possible to get the process start | |
337 | * time from the p_stat structure, but there's | |
338 | * no "file creation" time stamp anyway, and the | |
339 | * p_stat structure is not addressible if u. gets | |
340 | * swapped out for that process. | |
341 | */ | |
5d86e205 JSP |
342 | microtime(&vap->va_ctime); |
343 | vap->va_atime = vap->va_mtime = vap->va_ctime; | |
76434cf5 JSP |
344 | |
345 | /* | |
346 | * now do the object specific fields | |
347 | * | |
348 | * The size could be set from struct reg, but it's hardly | |
349 | * worth the trouble, and it puts some (potentially) machine | |
350 | * dependent data into this machine-independent code. If it | |
351 | * becomes important then this function should break out into | |
352 | * a per-file stat function in the corresponding .c file. | |
353 | */ | |
354 | ||
355 | switch (pfs->pfs_type) { | |
356 | case Proot: | |
5d86e205 JSP |
357 | vap->va_nlink = 2; |
358 | vap->va_uid = 0; | |
359 | vap->va_gid = 0; | |
76434cf5 JSP |
360 | break; |
361 | ||
362 | case Pproc: | |
5d86e205 JSP |
363 | vap->va_nlink = 2; |
364 | vap->va_uid = procp->p_ucred->cr_uid; | |
365 | vap->va_gid = procp->p_ucred->cr_gid; | |
76434cf5 JSP |
366 | break; |
367 | ||
368 | case Pfile: | |
369 | error = EOPNOTSUPP; | |
370 | break; | |
371 | ||
372 | case Pmem: | |
5d86e205 JSP |
373 | vap->va_nlink = 1; |
374 | vap->va_bytes = vap->va_size = | |
76434cf5 JSP |
375 | ctob(procp->p_vmspace->vm_tsize + |
376 | procp->p_vmspace->vm_dsize + | |
377 | procp->p_vmspace->vm_ssize); | |
5d86e205 JSP |
378 | vap->va_uid = procp->p_ucred->cr_uid; |
379 | vap->va_gid = procp->p_ucred->cr_gid; | |
76434cf5 JSP |
380 | break; |
381 | ||
382 | case Pregs: | |
6fdd7e21 | 383 | case Pfpregs: |
76434cf5 JSP |
384 | case Pctl: |
385 | case Pstatus: | |
386 | case Pnote: | |
387 | case Pnotepg: | |
5d86e205 JSP |
388 | vap->va_nlink = 1; |
389 | vap->va_uid = procp->p_ucred->cr_uid; | |
390 | vap->va_gid = procp->p_ucred->cr_gid; | |
76434cf5 JSP |
391 | break; |
392 | ||
393 | default: | |
394 | panic("procfs_getattr"); | |
395 | } | |
396 | ||
397 | return (error); | |
398 | } | |
399 | ||
400 | procfs_setattr(ap) | |
401 | struct vop_setattr_args *ap; | |
402 | { | |
403 | /* | |
404 | * just fake out attribute setting | |
405 | * it's not good to generate an error | |
406 | * return, otherwise things like creat() | |
407 | * will fail when they try to set the | |
408 | * file length to 0. worse, this means | |
409 | * that echo $note > /proc/$pid/note will fail. | |
410 | */ | |
411 | ||
412 | return (0); | |
413 | } | |
414 | ||
415 | /* | |
416 | * implement access checking. | |
417 | * | |
418 | * something very similar to this code is duplicated | |
419 | * throughout the 4bsd kernel and should be moved | |
420 | * into kern/vfs_subr.c sometime. | |
421 | * | |
422 | * actually, the check for super-user is slightly | |
423 | * broken since it will allow read access to write-only | |
424 | * objects. this doesn't cause any particular trouble | |
425 | * but does mean that the i/o entry points need to check | |
426 | * that the operation really does make sense. | |
427 | */ | |
428 | procfs_access(ap) | |
429 | struct vop_access_args *ap; | |
430 | { | |
431 | struct vattr *vap; | |
432 | struct vattr vattr; | |
433 | int error; | |
434 | ||
435 | /* | |
436 | * If you're the super-user, | |
437 | * you always get access. | |
438 | */ | |
439 | if (ap->a_cred->cr_uid == (uid_t) 0) | |
440 | return (0); | |
441 | vap = &vattr; | |
442 | if (error = VOP_GETATTR(ap->a_vp, vap, ap->a_cred, ap->a_p)) | |
443 | return (error); | |
444 | ||
445 | /* | |
446 | * Access check is based on only one of owner, group, public. | |
447 | * If not owner, then check group. If not a member of the | |
448 | * group, then check public access. | |
449 | */ | |
450 | if (ap->a_cred->cr_uid != vap->va_uid) { | |
451 | gid_t *gp; | |
452 | int i; | |
453 | ||
454 | (ap->a_mode) >>= 3; | |
455 | gp = ap->a_cred->cr_groups; | |
456 | for (i = 0; i < ap->a_cred->cr_ngroups; i++, gp++) | |
457 | if (vap->va_gid == *gp) | |
458 | goto found; | |
459 | ap->a_mode >>= 3; | |
460 | found: | |
461 | ; | |
462 | } | |
463 | ||
464 | if ((vap->va_mode & ap->a_mode) == ap->a_mode) | |
465 | return (0); | |
466 | ||
467 | return (EACCES); | |
468 | } | |
469 | ||
470 | /* | |
471 | * lookup. this is incredibly complicated in the | |
472 | * general case, however for most pseudo-filesystems | |
473 | * very little needs to be done. | |
474 | * | |
475 | * unless you want to get a migraine, just make sure your | |
476 | * filesystem doesn't do any locking of its own. otherwise | |
477 | * read and inwardly digest ufs_lookup(). | |
478 | */ | |
479 | procfs_lookup(ap) | |
480 | struct vop_lookup_args *ap; | |
481 | { | |
482 | struct componentname *cnp = ap->a_cnp; | |
483 | struct vnode **vpp = ap->a_vpp; | |
484 | struct vnode *dvp = ap->a_dvp; | |
485 | char *pname = cnp->cn_nameptr; | |
486 | int error = 0; | |
76434cf5 JSP |
487 | pid_t pid; |
488 | struct vnode *nvp; | |
489 | struct pfsnode *pfs; | |
490 | struct proc *procp; | |
76434cf5 JSP |
491 | pfstype pfs_type; |
492 | int i; | |
493 | ||
494 | if (cnp->cn_namelen == 1 && *pname == '.') { | |
495 | *vpp = dvp; | |
496 | VREF(dvp); | |
497 | /*VOP_LOCK(dvp);*/ | |
498 | return (0); | |
499 | } | |
500 | ||
501 | *vpp = NULL; | |
502 | ||
503 | pfs = VTOPFS(dvp); | |
504 | switch (pfs->pfs_type) { | |
505 | case Proot: | |
506 | if (cnp->cn_flags & ISDOTDOT) | |
507 | return (EIO); | |
508 | ||
509 | if (CNEQ(cnp, "curproc", 7)) | |
510 | pid = cnp->cn_proc->p_pid; | |
511 | else | |
512 | pid = atopid(pname, cnp->cn_namelen); | |
513 | if (pid == NO_PID) | |
514 | return (ENOENT); | |
515 | ||
516 | procp = PFIND(pid); | |
517 | if (procp == 0) | |
518 | return (ENOENT); | |
519 | ||
520 | error = procfs_allocvp(dvp->v_mount, &nvp, pid, Pproc); | |
521 | if (error) | |
522 | return (error); | |
523 | ||
524 | nvp->v_type = VDIR; | |
525 | pfs = VTOPFS(nvp); | |
526 | ||
527 | *vpp = nvp; | |
528 | return (0); | |
529 | ||
530 | case Pproc: | |
531 | if (cnp->cn_flags & ISDOTDOT) { | |
532 | error = procfs_root(dvp->v_mount, vpp); | |
533 | return (error); | |
534 | } | |
535 | ||
536 | procp = PFIND(pfs->pfs_pid); | |
537 | if (procp == 0) | |
538 | return (ENOENT); | |
539 | ||
540 | for (i = 0; i < Nprocent; i++) { | |
541 | struct pfsnames *dp = &procent[i]; | |
542 | ||
543 | if (cnp->cn_namelen == dp->d_namlen && | |
544 | bcmp(pname, dp->d_name, dp->d_namlen) == 0) { | |
545 | pfs_type = dp->d_pfstype; | |
546 | goto found; | |
547 | } | |
548 | } | |
549 | return (ENOENT); | |
550 | ||
551 | found: | |
552 | if (pfs_type == Pfile) { | |
553 | nvp = procfs_findtextvp(procp); | |
554 | if (nvp) { | |
555 | VREF(nvp); | |
556 | VOP_LOCK(nvp); | |
557 | } else { | |
558 | error = ENXIO; | |
559 | } | |
560 | } else { | |
561 | error = procfs_allocvp(dvp->v_mount, &nvp, | |
562 | pfs->pfs_pid, pfs_type); | |
563 | if (error) | |
564 | return (error); | |
565 | ||
566 | nvp->v_type = VREG; | |
567 | pfs = VTOPFS(nvp); | |
568 | } | |
569 | *vpp = nvp; | |
570 | return (error); | |
571 | ||
572 | default: | |
573 | return (ENOTDIR); | |
574 | } | |
575 | } | |
576 | ||
577 | /* | |
578 | * readdir returns directory entries from pfsnode (vp). | |
579 | * | |
580 | * the strategy here with procfs is to generate a single | |
581 | * directory entry at a time (struct pfsdent) and then | |
582 | * copy that out to userland using uiomove. a more efficent | |
583 | * though more complex implementation, would try to minimize | |
584 | * the number of calls to uiomove(). for procfs, this is | |
585 | * hardly worth the added code complexity. | |
586 | * | |
587 | * this should just be done through read() | |
588 | */ | |
589 | procfs_readdir(ap) | |
590 | struct vop_readdir_args *ap; | |
591 | { | |
592 | struct uio *uio = ap->a_uio; | |
593 | struct pfsdent d; | |
594 | struct pfsdent *dp = &d; | |
595 | struct pfsnode *pfs; | |
596 | int error; | |
597 | int count; | |
598 | int i; | |
599 | ||
600 | pfs = VTOPFS(ap->a_vp); | |
601 | ||
602 | if (uio->uio_resid < UIO_MX) | |
603 | return (EINVAL); | |
604 | if (uio->uio_offset & (UIO_MX-1)) | |
605 | return (EINVAL); | |
606 | if (uio->uio_offset < 0) | |
607 | return (EINVAL); | |
608 | ||
609 | error = 0; | |
610 | count = 0; | |
611 | i = uio->uio_offset / UIO_MX; | |
612 | ||
613 | switch (pfs->pfs_type) { | |
614 | /* | |
615 | * this is for the process-specific sub-directories. | |
616 | * all that is needed to is copy out all the entries | |
617 | * from the procent[] table (top of this file). | |
618 | */ | |
619 | case Pproc: { | |
620 | while (uio->uio_resid >= UIO_MX) { | |
621 | struct pfsnames *dt; | |
622 | ||
623 | if (i >= Nprocent) | |
624 | break; | |
625 | ||
626 | dt = &procent[i]; | |
627 | ||
628 | dp->d_reclen = UIO_MX; | |
629 | dp->d_fileno = PROCFS_FILENO(pfs->pfs_pid, dt->d_pfstype); | |
630 | dp->d_type = DT_REG; | |
631 | dp->d_namlen = dt->d_namlen; | |
632 | bcopy(dt->d_name, dp->d_name, sizeof(dt->d_name)-1); | |
633 | error = uiomove((caddr_t) dp, UIO_MX, uio); | |
634 | if (error) | |
635 | break; | |
636 | count += UIO_MX; | |
637 | i++; | |
638 | } | |
639 | ||
640 | break; | |
641 | ||
642 | } | |
643 | ||
644 | /* | |
645 | * this is for the root of the procfs filesystem | |
646 | * what is needed is a special entry for "curproc" | |
647 | * followed by an entry for each process on allproc | |
648 | #ifdef PROCFS_ZOMBIE | |
649 | * and zombproc. | |
650 | #endif | |
651 | */ | |
652 | ||
653 | case Proot: { | |
654 | int pcnt; | |
655 | #ifdef PROCFS_ZOMBIE | |
656 | int doingzomb = 0; | |
657 | #endif | |
658 | volatile struct proc *p; | |
659 | ||
660 | p = allproc; | |
661 | ||
662 | #define PROCFS_XFILES 1 /* number of other entries, like "curproc" */ | |
663 | pcnt = PROCFS_XFILES; | |
664 | ||
665 | while (p && uio->uio_resid >= UIO_MX) { | |
666 | bzero((char *) dp, UIO_MX); | |
667 | dp->d_type = DT_DIR; | |
668 | dp->d_reclen = UIO_MX; | |
669 | ||
670 | switch (i) { | |
671 | case 0: | |
672 | /* ship out entry for "curproc" */ | |
673 | dp->d_fileno = PROCFS_FILENO(PID_MAX+1, Pproc); | |
5d86e205 | 674 | dp->d_namlen = sprintf(dp->d_name, "curproc"); |
76434cf5 JSP |
675 | break; |
676 | ||
677 | default: | |
678 | if (pcnt >= i) { | |
679 | dp->d_fileno = PROCFS_FILENO(p->p_pid, Pproc); | |
680 | dp->d_namlen = sprintf(dp->d_name, "%ld", (long) p->p_pid); | |
681 | } | |
682 | ||
683 | p = p->p_next; | |
684 | ||
685 | #ifdef PROCFS_ZOMBIE | |
686 | if (p == 0 && doingzomb == 0) { | |
687 | doingzomb = 1; | |
688 | p = zombproc; | |
689 | } | |
690 | #endif | |
691 | ||
692 | if (pcnt++ < i) | |
693 | continue; | |
694 | ||
695 | break; | |
696 | } | |
697 | error = uiomove((caddr_t) dp, UIO_MX, uio); | |
698 | if (error) | |
699 | break; | |
700 | count += UIO_MX; | |
701 | i++; | |
702 | } | |
703 | ||
704 | break; | |
705 | ||
706 | } | |
707 | ||
708 | default: | |
709 | error = ENOTDIR; | |
710 | break; | |
711 | } | |
712 | ||
713 | uio->uio_offset = i * UIO_MX; | |
714 | ||
715 | return (error); | |
716 | } | |
717 | ||
718 | /* | |
719 | * convert decimal ascii to pid_t | |
720 | */ | |
721 | static pid_t | |
722 | atopid(b, len) | |
723 | const char *b; | |
724 | u_int len; | |
725 | { | |
726 | pid_t p = 0; | |
727 | ||
728 | while (len--) { | |
729 | char c = *b++; | |
730 | if (c < '0' || c > '9') | |
731 | return (NO_PID); | |
732 | p = 10 * p + (c - '0'); | |
733 | if (p > PID_MAX) | |
734 | return (NO_PID); | |
735 | } | |
736 | ||
737 | return (p); | |
738 | } | |
739 | ||
740 | /* | |
741 | * procfs vnode operations. | |
742 | */ | |
743 | int (**procfs_vnodeop_p)(); | |
744 | struct vnodeopv_entry_desc procfs_vnodeop_entries[] = { | |
745 | { &vop_default_desc, vn_default_error }, | |
746 | { &vop_lookup_desc, procfs_lookup }, /* lookup */ | |
747 | { &vop_create_desc, procfs_create }, /* create */ | |
748 | { &vop_mknod_desc, procfs_mknod }, /* mknod */ | |
749 | { &vop_open_desc, procfs_open }, /* open */ | |
750 | { &vop_close_desc, procfs_close }, /* close */ | |
751 | { &vop_access_desc, procfs_access }, /* access */ | |
752 | { &vop_getattr_desc, procfs_getattr }, /* getattr */ | |
753 | { &vop_setattr_desc, procfs_setattr }, /* setattr */ | |
754 | { &vop_read_desc, procfs_read }, /* read */ | |
755 | { &vop_write_desc, procfs_write }, /* write */ | |
756 | { &vop_ioctl_desc, procfs_ioctl }, /* ioctl */ | |
757 | { &vop_select_desc, procfs_select }, /* select */ | |
758 | { &vop_mmap_desc, procfs_mmap }, /* mmap */ | |
759 | { &vop_fsync_desc, procfs_fsync }, /* fsync */ | |
760 | { &vop_seek_desc, procfs_seek }, /* seek */ | |
761 | { &vop_remove_desc, procfs_remove }, /* remove */ | |
762 | { &vop_link_desc, procfs_link }, /* link */ | |
763 | { &vop_rename_desc, procfs_rename }, /* rename */ | |
764 | { &vop_mkdir_desc, procfs_mkdir }, /* mkdir */ | |
765 | { &vop_rmdir_desc, procfs_rmdir }, /* rmdir */ | |
766 | { &vop_symlink_desc, procfs_symlink }, /* symlink */ | |
767 | { &vop_readdir_desc, procfs_readdir }, /* readdir */ | |
768 | { &vop_readlink_desc, procfs_readlink }, /* readlink */ | |
769 | { &vop_abortop_desc, procfs_abortop }, /* abortop */ | |
770 | { &vop_inactive_desc, procfs_inactive }, /* inactive */ | |
771 | { &vop_reclaim_desc, procfs_reclaim }, /* reclaim */ | |
772 | { &vop_lock_desc, procfs_lock }, /* lock */ | |
773 | { &vop_unlock_desc, procfs_unlock }, /* unlock */ | |
774 | { &vop_bmap_desc, procfs_bmap }, /* bmap */ | |
775 | { &vop_strategy_desc, procfs_strategy }, /* strategy */ | |
776 | { &vop_print_desc, procfs_print }, /* print */ | |
777 | { &vop_islocked_desc, procfs_islocked }, /* islocked */ | |
778 | { &vop_pathconf_desc, procfs_pathconf }, /* pathconf */ | |
779 | { &vop_advlock_desc, procfs_advlock }, /* advlock */ | |
780 | { &vop_blkatoff_desc, procfs_blkatoff }, /* blkatoff */ | |
781 | { &vop_valloc_desc, procfs_valloc }, /* valloc */ | |
782 | { &vop_vfree_desc, procfs_vfree }, /* vfree */ | |
783 | { &vop_truncate_desc, procfs_truncate }, /* truncate */ | |
784 | { &vop_update_desc, procfs_update }, /* update */ | |
785 | { (struct vnodeop_desc*)NULL, (int(*)())NULL } | |
786 | }; | |
787 | struct vnodeopv_desc procfs_vnodeop_opv_desc = | |
788 | { &procfs_vnodeop_p, procfs_vnodeop_entries }; |