2 * Copyright (c) 2000 Dag-Erling Coïdan Smørgrav
3 * Copyright (c) 1999 Pierre Beyssac
4 * Copyright (c) 1993, 1995 Jan-Simon Pendry
5 * Copyright (c) 1993, 1995
6 * The Regents of the University of California. All rights reserved.
8 * This code is derived from software contributed to Berkeley by
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgement:
21 * This product includes software developed by the University of
22 * California, Berkeley and its contributors.
23 * 4. Neither the name of the University nor the names of its contributors
24 * may be used to endorse or promote products derived from this software
25 * without specific prior written permission.
27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
39 * @(#)procfs_vnops.c 8.18 (Berkeley) 5/21/95
41 * $FreeBSD: src/sys/i386/linux/linprocfs/linprocfs_vnops.c,v 1.3.2.5 2001/08/12 14:29:19 rwatson Exp $
42 * $DragonFly: src/sys/emulation/linux/i386/linprocfs/linprocfs_vnops.c,v 1.42 2007/11/20 21:03:48 dillon Exp $
46 * procfs vnode interface
49 #include <sys/param.h>
50 #include <sys/systm.h>
52 #include <sys/kernel.h>
54 #include <sys/fcntl.h>
57 #include <sys/signalvar.h>
58 #include <sys/vnode.h>
59 #include <sys/mount.h>
60 #include <sys/namei.h>
61 #include <sys/dirent.h>
62 #include <sys/malloc.h>
65 #include <vm/vm_zone.h>
66 #include "linprocfs.h"
67 #include <sys/pioctl.h>
69 #include <machine/limits.h>
71 extern struct vnode *procfs_findtextvp (struct proc *);
73 static int linprocfs_access (struct vop_access_args *);
74 static int linprocfs_badop (struct vop_generic_args *);
75 static int linprocfs_bmap (struct vop_bmap_args *);
76 static int linprocfs_close (struct vop_close_args *);
77 static int linprocfs_getattr (struct vop_getattr_args *);
78 static int linprocfs_inactive (struct vop_inactive_args *);
79 static int linprocfs_ioctl (struct vop_ioctl_args *);
80 static int linprocfs_lookup (struct vop_old_lookup_args *);
81 static int linprocfs_open (struct vop_open_args *);
82 static int linprocfs_print (struct vop_print_args *);
83 static int linprocfs_readdir (struct vop_readdir_args *);
84 static int linprocfs_readlink (struct vop_readlink_args *);
85 static int linprocfs_reclaim (struct vop_reclaim_args *);
86 static int linprocfs_setattr (struct vop_setattr_args *);
88 static int linprocfs_readdir_proc(struct vop_readdir_args *);
89 static int linprocfs_readdir_root(struct vop_readdir_args *);
90 static int linprocfs_readdir_net(struct vop_readdir_args *ap);
91 static int linprocfs_readdir_sys(struct vop_readdir_args *ap);
92 static int linprocfs_readdir_syskernel(struct vop_readdir_args *ap);
95 * procfs vnode operations.
97 struct vop_ops linprocfs_vnode_vops = {
98 .vop_default = vop_defaultop,
99 .vop_access = linprocfs_access,
100 .vop_advlock = (void *)linprocfs_badop,
101 .vop_bmap = linprocfs_bmap,
102 .vop_close = linprocfs_close,
103 .vop_old_create = (void *)linprocfs_badop,
104 .vop_getattr = linprocfs_getattr,
105 .vop_inactive = linprocfs_inactive,
106 .vop_old_link = (void *)linprocfs_badop,
107 .vop_old_lookup = linprocfs_lookup,
108 .vop_old_mkdir = (void *)linprocfs_badop,
109 .vop_old_mknod = (void *)linprocfs_badop,
110 .vop_open = linprocfs_open,
111 .vop_pathconf = vop_stdpathconf,
112 .vop_print = linprocfs_print,
113 .vop_read = (void *)linprocfs_rw,
114 .vop_readdir = linprocfs_readdir,
115 .vop_readlink = linprocfs_readlink,
116 .vop_reclaim = linprocfs_reclaim,
117 .vop_old_remove = (void *)linprocfs_badop,
118 .vop_old_rename = (void *)linprocfs_badop,
119 .vop_old_rmdir = (void *)linprocfs_badop,
120 .vop_setattr = linprocfs_setattr,
121 .vop_old_symlink = (void *)linprocfs_badop,
122 .vop_write = (void *)linprocfs_rw,
123 .vop_ioctl = linprocfs_ioctl
127 * This is a list of the valid names in the
128 * process-specific sub-directories. It is
129 * used in linprocfs_lookup and linprocfs_readdir
131 static struct proc_target {
136 int (*pt_valid) (struct proc *p);
138 #define N(s) sizeof(s)-1, s
139 /* name type validp */
140 { DT_DIR, N("."), Pproc, NULL },
141 { DT_DIR, N(".."), Proot, NULL },
142 { DT_REG, N("mem"), Pmem, NULL },
144 { DT_LNK, N("exe"), Pexe, NULL },
145 { DT_LNK, N("cwd"), Pcwd, NULL },
146 { DT_LNK, N("root"), Pprocroot, NULL },
147 { DT_LNK, N("fd"), Pfd, NULL },
149 { DT_REG, N("stat"), Pprocstat, NULL },
150 { DT_REG, N("status"), Pprocstatus, NULL },
151 { DT_REG, N("maps"), Pmaps, NULL },
152 { DT_REG, N("statm"), Pstatm, NULL },
154 { DT_REG, N("cmdline"), Pcmdline, NULL },
155 { DT_REG, N("environ"), Penviron, NULL },
159 static const int nproc_targets = sizeof(proc_targets) / sizeof(proc_targets[0]);
161 static pid_t atopid (const char *, u_int);
164 * set things up for doing i/o on
165 * the pfsnode (vp). (vp) is locked
166 * on entry, and should be left locked
169 * for procfs we don't need to do anything
170 * in particular for i/o. all that is done
171 * is to support exclusive open on process
175 linprocfs_open(struct vop_open_args *ap)
177 struct pfsnode *pfs = VTOPFS(ap->a_vp);
180 p2 = PFIND(pfs->pfs_pid);
183 if (pfs->pfs_pid && !PRISON_CHECK(ap->a_cred, p2->p_ucred))
186 switch (pfs->pfs_type) {
188 if (((pfs->pfs_flags & FWRITE) && (ap->a_mode & O_EXCL)) ||
189 ((pfs->pfs_flags & O_EXCL) && (ap->a_mode & FWRITE)))
192 if (p_trespass(ap->a_cred, p2->p_ucred))
195 if (ap->a_mode & FWRITE)
196 pfs->pfs_flags = ap->a_mode & (FWRITE|O_EXCL);
203 return (vop_stdopen(ap));
207 * close the pfsnode (vp) after doing i/o.
208 * (vp) is not locked on entry or exit.
210 * nothing to do for procfs other than undo
211 * any exclusive open flag (see _open above).
214 linprocfs_close(struct vop_close_args *ap)
216 struct pfsnode *pfs = VTOPFS(ap->a_vp);
219 switch (pfs->pfs_type) {
221 if ((ap->a_fflag & FWRITE) && (pfs->pfs_flags & O_EXCL))
222 pfs->pfs_flags &= ~(FWRITE|O_EXCL);
224 * If this is the last close, then it checks to see if
225 * the target process has PF_LINGER set in p_pfsflags,
226 * if this is *not* the case, then the process' stop flags
227 * are cleared, and the process is woken up. This is
228 * to help prevent the case where a process has been
229 * told to stop on an event, but then the requesting process
230 * has gone away or forgotten about it.
232 if ((ap->a_vp->v_opencount < 2)
233 && (p = pfind(pfs->pfs_pid))
234 && !(p->p_pfsflags & PF_LINGER)) {
243 return (vop_stdclose(ap));
247 * do an ioctl operation on a pfsnode (vp).
248 * (vp) is not locked on entry or exit.
251 linprocfs_ioctl(struct vop_ioctl_args *ap)
253 struct pfsnode *pfs = VTOPFS(ap->a_vp);
257 struct procfs_status *psp;
260 procp = pfind(pfs->pfs_pid);
265 if (p_trespass(ap->a_cred, procp->p_ucred))
268 switch (ap->a_command) {
270 procp->p_stops |= *(unsigned int*)ap->a_data;
273 procp->p_stops &= ~*(unsigned int*)ap->a_data;
277 * NFLAGS is "non-suser_xxx flags" -- currently, only
278 * PFS_ISUGID ("ignore set u/g id");
280 #define NFLAGS (PF_ISUGID)
281 flags = (unsigned char)*(unsigned int*)ap->a_data;
282 if (flags & NFLAGS && (error = priv_check_cred(ap->a_cred, PRIV_ROOT, 0)))
284 procp->p_pfsflags = flags;
287 *(unsigned int*)ap->a_data = (unsigned int)procp->p_pfsflags;
289 psp = (struct procfs_status *)ap->a_data;
290 psp->state = (procp->p_step == 0);
291 psp->flags = procp->p_pfsflags;
292 psp->events = procp->p_stops;
294 psp->why = procp->p_stype;
295 psp->val = procp->p_xstat;
297 psp->why = psp->val = 0; /* Not defined values */
301 psp = (struct procfs_status *)ap->a_data;
302 if (procp->p_step == 0) {
303 error = tsleep(&procp->p_stype, PCATCH, "piocwait", 0);
307 psp->state = 1; /* It stopped */
308 psp->flags = procp->p_pfsflags;
309 psp->events = procp->p_stops;
310 psp->why = procp->p_stype; /* why it stopped */
311 psp->val = procp->p_xstat; /* any extra info */
313 case PIOCCONT: /* Restart a proc */
314 if (procp->p_step == 0)
315 return EINVAL; /* Can only start a stopped process */
316 if ((signo = *(int*)ap->a_data) != 0) {
317 if (signo >= NSIG || signo <= 0)
319 ksignal(procp, signo);
322 wakeup(&procp->p_step);
331 * do block mapping for pfsnode (vp).
332 * since we don't use the buffer cache
333 * for procfs this function should never
334 * be called. in any case, it's not clear
335 * what part of the kernel ever makes use
336 * of this function. for sanity, this is the
337 * usual no-op bmap, although returning
338 * (EIO) would be a reasonable alternative.
341 linprocfs_bmap(struct vop_bmap_args *ap)
343 if (ap->a_doffsetp != NULL)
344 *ap->a_doffsetp = ap->a_loffset;
345 if (ap->a_runp != NULL)
347 if (ap->a_runb != NULL)
353 * linprocfs_inactive is called when the pfsnode
354 * is vrele'd and the reference count is about
355 * to go to zero. (vp) will be on the vnode free
356 * list, so to get it back vget() must be
359 * (vp) is locked on entry and must remain locked
363 linprocfs_inactive(struct vop_inactive_args *ap)
365 /*struct vnode *vp = ap->a_vp;*/
371 * _reclaim is called when getnewvnode()
372 * wants to make use of an entry on the vnode
373 * free list. at this time the filesystem needs
374 * to free any private data and remove the node
375 * from any private lists.
378 linprocfs_reclaim(struct vop_reclaim_args *ap)
380 return (linprocfs_freevp(ap->a_vp));
384 * _print is used for debugging.
385 * just print a readable description
389 linprocfs_print(struct vop_print_args *ap)
391 struct pfsnode *pfs = VTOPFS(ap->a_vp);
393 kprintf("tag VT_PROCFS, type %d, pid %ld, mode %x, flags %lx\n",
394 pfs->pfs_type, (long)pfs->pfs_pid, pfs->pfs_mode, pfs->pfs_flags);
399 * generic entry point for unsupported operations
402 linprocfs_badop(struct vop_generic_args *ap __unused)
409 * Invent attributes for pfsnode (vp) and store
411 * Directories lengths are returned as zero since
412 * any real length would require the genuine size
413 * to be computed, and nothing cares anyway.
415 * this is relatively minimal for procfs.
418 linprocfs_getattr(struct vop_getattr_args *ap)
420 struct pfsnode *pfs = VTOPFS(ap->a_vp);
421 struct vattr *vap = ap->a_vap;
426 * First make sure that the process and its credentials
429 switch (pfs->pfs_type) {
436 procp = PFIND(pfs->pfs_pid);
437 if (procp == 0 || procp->p_ucred == NULL)
443 /* start by zeroing out the attributes */
446 /* next do all the common fields */
447 vap->va_type = ap->a_vp->v_type;
448 vap->va_mode = pfs->pfs_mode;
449 vap->va_fileid = pfs->pfs_fileno;
451 vap->va_blocksize = PAGE_SIZE;
452 vap->va_bytes = vap->va_size = 0;
453 vap->va_fsid = ap->a_vp->v_mount->mnt_stat.f_fsid.val[0];
456 * Make all times be current TOD.
457 * It would be possible to get the process start
458 * time from the p_stat structure, but there's
459 * no "file creation" time stamp anyway, and the
460 * p_stat structure is not addressible if u. gets
461 * swapped out for that process.
463 nanotime(&vap->va_ctime);
464 vap->va_atime = vap->va_mtime = vap->va_ctime;
467 * now do the object specific fields
469 * The size could be set from struct reg, but it's hardly
470 * worth the trouble, and it puts some (potentially) machine
471 * dependent data into this machine-independent code. If it
472 * becomes important then this function should break out into
473 * a per-file stat function in the corresponding .c file.
478 vap->va_uid = procp->p_ucred->cr_uid;
479 vap->va_gid = procp->p_ucred->cr_gid;
482 switch (pfs->pfs_type) {
488 * Set nlink to 1 to tell fts(3) we don't actually know.
493 vap->va_size = vap->va_bytes = DEV_BSIZE;
497 char buf[16]; /* should be enough */
500 vap->va_size = vap->va_bytes =
501 ksnprintf(buf, sizeof(buf), "%ld", (long)curproc->p_pid);
506 vap->va_nlink = nproc_targets;
507 vap->va_size = vap->va_bytes = DEV_BSIZE;
511 char *fullpath, *freepath;
512 error = cache_fullpath(procp, &procp->p_textnch, &fullpath, &freepath);
513 /* error = vn_fullpath(procp, NULL, &fullpath, &freepath); */
515 vap->va_size = strlen(fullpath);
516 kfree(freepath, M_TEMP);
518 vap->va_size = sizeof("unknown") - 1;
521 vap->va_bytes = vap->va_size;
525 char *fullpath, *freepath;
526 error = cache_fullpath(procp, &procp->p_fd->fd_ncdir, &fullpath, &freepath);
528 vap->va_size = strlen(fullpath);
529 kfree(freepath, M_TEMP);
531 vap->va_size = sizeof("unknown") - 1;
534 vap->va_bytes = vap->va_size;
538 struct nchandle *nchp;
539 char *fullpath, *freepath;
540 nchp = jailed(procp->p_ucred) ? &procp->p_fd->fd_njdir : &procp->p_fd->fd_nrdir;
541 error = cache_fullpath(procp, nchp, &fullpath, &freepath);
543 vap->va_size = strlen(fullpath);
544 kfree(freepath, M_TEMP);
546 vap->va_size = sizeof("unknown") - 1;
549 vap->va_bytes = vap->va_size;
553 if (procp == curproc) {
554 vap->va_size = sizeof("/dev/fd") - 1;
557 vap->va_size = sizeof("unknown") - 1;
560 vap->va_bytes = vap->va_size;
576 vap->va_bytes = vap->va_size = 0;
583 * If we denied owner access earlier, then we have to
584 * change the owner to root - otherwise 'ps' and friends
585 * will break even though they are setgid kmem. *SIGH*
587 if (procp->p_flag & P_SUGID)
590 vap->va_uid = procp->p_ucred->cr_uid;
599 vap->va_bytes = vap->va_size = 0;
600 /* uid, gid are already set */
604 panic("linprocfs_getattr");
611 linprocfs_setattr(struct vop_setattr_args *ap)
614 if (ap->a_vap->va_flags != VNOVAL)
618 * just fake out attribute setting
619 * it's not good to generate an error
620 * return, otherwise things like creat()
621 * will fail when they try to set the
622 * file length to 0. worse, this means
623 * that echo $note > /proc/$pid/note will fail.
630 * implement access checking.
632 * something very similar to this code is duplicated
633 * throughout the 4bsd kernel and should be moved
634 * into kern/vfs_subr.c sometime.
636 * actually, the check for super-user is slightly
637 * broken since it will allow read access to write-only
638 * objects. this doesn't cause any particular trouble
639 * but does mean that the i/o entry points need to check
640 * that the operation really does make sense.
643 linprocfs_access(struct vop_access_args *ap)
650 * If you're the super-user,
651 * you always get access.
653 if (ap->a_cred->cr_uid == 0)
657 error = VOP_GETATTR(ap->a_vp, vap);
662 * Access check is based on only one of owner, group, public.
663 * If not owner, then check group. If not a member of the
664 * group, then check public access.
666 if (ap->a_cred->cr_uid != vap->va_uid) {
671 gp = ap->a_cred->cr_groups;
672 for (i = 0; i < ap->a_cred->cr_ngroups; i++, gp++)
673 if (vap->va_gid == *gp)
680 if ((vap->va_mode & ap->a_mode) == ap->a_mode)
687 * lookup. this is incredibly complicated in the general case, however
688 * for most pseudo-filesystems very little needs to be done.
691 linprocfs_lookup(struct vop_old_lookup_args *ap)
693 struct componentname *cnp = ap->a_cnp;
694 struct vnode **vpp = ap->a_vpp;
695 struct vnode *dvp = ap->a_dvp;
696 char *pname = cnp->cn_nameptr;
697 struct proc_target *pt;
706 if (cnp->cn_nameiop == NAMEI_DELETE ||
707 cnp->cn_nameiop == NAMEI_RENAME ||
708 cnp->cn_nameiop == NAMEI_CREATE) {
714 if (cnp->cn_namelen == 1 && *pname == '.') {
721 switch (pfs->pfs_type) {
723 if (cnp->cn_flags & CNP_ISDOTDOT) {
724 error = linprocfs_root(dvp->v_mount, vpp);
727 if (CNEQ(cnp, "kernel", 6)) {
728 error = linprocfs_allocvp(dvp->v_mount, vpp, 0, Psyskernel);
733 if (cnp->cn_flags & CNP_ISDOTDOT) {
734 error = linprocfs_root(dvp->v_mount, vpp);
737 if (CNEQ(cnp, "dev", 3)) {
738 error = linprocfs_allocvp(dvp->v_mount, vpp, 0, Pnetdev);
743 if (cnp->cn_flags & CNP_ISDOTDOT) {
744 /* XXX: this is wrong, wrong, wrong. */
745 error = linprocfs_root(dvp->v_mount, vpp);
748 if (CNEQ(cnp, "osrelease", 9)) {
749 error = linprocfs_allocvp(dvp->v_mount, vpp, 0, Posrelease);
752 if (CNEQ(cnp, "ostype", 6)) {
753 error = linprocfs_allocvp(dvp->v_mount, vpp, 0, Postype);
756 if (CNEQ(cnp, "pid_max", 7)) {
757 error = linprocfs_allocvp(dvp->v_mount, vpp, 0, Ppidmax);
760 if (CNEQ(cnp, "version", 7)) {
761 error = linprocfs_allocvp(dvp->v_mount, vpp, 0, Pversion);
767 if (cnp->cn_flags & CNP_ISDOTDOT)
770 if (CNEQ(cnp, "self", 4)) {
771 error = linprocfs_allocvp(dvp->v_mount, vpp, 0, Pself);
774 if (CNEQ(cnp, "meminfo", 7)) {
775 error = linprocfs_allocvp(dvp->v_mount, vpp, 0, Pmeminfo);
778 if (CNEQ(cnp, "cpuinfo", 7)) {
779 error = linprocfs_allocvp(dvp->v_mount, vpp, 0, Pcpuinfo);
782 if (CNEQ(cnp, "mounts", 6)) {
783 error = linprocfs_allocvp(dvp->v_mount, vpp, 0, Pmounts);
786 if (CNEQ(cnp, "stat", 4)) {
787 error = linprocfs_allocvp(dvp->v_mount, vpp, 0, Pstat);
790 if (CNEQ(cnp, "uptime", 6)) {
791 error = linprocfs_allocvp(dvp->v_mount, vpp, 0, Puptime);
794 if (CNEQ(cnp, "version", 7)) {
795 error = linprocfs_allocvp(dvp->v_mount, vpp, 0, Pversion);
798 if (CNEQ(cnp, "loadavg", 7)) {
799 error = linprocfs_allocvp(dvp->v_mount, vpp, 0, Ploadavg);
802 if (CNEQ(cnp, "net", 3)) {
803 error = linprocfs_allocvp(dvp->v_mount, vpp, 0, Pnet);
806 if (CNEQ(cnp, "sys", 3)) {
807 error = linprocfs_allocvp(dvp->v_mount, vpp, 0, Psys);
811 pid = atopid(pname, cnp->cn_namelen);
819 if (!PRISON_CHECK(ap->a_cnp->cn_cred, p->p_ucred))
822 if (ps_showallprocs == 0 && ap->a_cnp->cn_cred->cr_uid != 0 &&
823 ap->a_cnp->cn_cred->cr_uid != p->p_ucred->cr_uid)
826 error = linprocfs_allocvp(dvp->v_mount, vpp, pid, Pproc);
830 if (cnp->cn_flags & CNP_ISDOTDOT) {
831 error = linprocfs_root(dvp->v_mount, vpp);
835 p = PFIND(pfs->pfs_pid);
839 if (!PRISON_CHECK(ap->a_cnp->cn_cred, p->p_ucred))
842 if (ps_showallprocs == 0 && ap->a_cnp->cn_cred->cr_uid != 0 &&
843 ap->a_cnp->cn_cred->cr_uid != p->p_ucred->cr_uid)
846 for (pt = proc_targets, i = 0; i < nproc_targets; pt++, i++) {
847 if (cnp->cn_namelen == pt->pt_namlen &&
848 bcmp(pt->pt_name, pname, cnp->cn_namelen) == 0 &&
849 (pt->pt_valid == NULL || (*pt->pt_valid)(p)))
855 error = linprocfs_allocvp(dvp->v_mount, vpp, pfs->pfs_pid,
864 if (cnp->cn_nameiop == NAMEI_LOOKUP)
870 * If no error occured *vpp will hold a referenced locked vnode.
871 * dvp was passed to us locked and *vpp must be returned locked
872 * so if dvp != *vpp and CNP_LOCKPARENT is not set, unlock dvp.
876 if (*vpp != dvp && (cnp->cn_flags & CNP_LOCKPARENT) == 0) {
877 cnp->cn_flags |= CNP_PDIRUNLOCK;
885 * Does this process have a text file?
888 linprocfs_validfile(struct proc *p)
891 return (procfs_findtextvp(p) != NULLVP);
895 * readdir() returns directory entries from pfsnode (vp).
897 * We generate just one directory entry at a time, as it would probably
898 * not pay off to buffer several entries locally to save uiomove calls.
900 * linprocfs_readdir(struct vnode *a_vp, struct uio *a_uio,
901 * struct ucred *a_cred, int *a_eofflag,
902 * int *a_ncookies, off_t **a_cookies)
905 linprocfs_readdir(struct vop_readdir_args *ap)
910 if (ap->a_uio->uio_offset < 0 || ap->a_uio->uio_offset > INT_MAX)
913 pfs = VTOPFS(ap->a_vp);
914 if ((error = vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY)) != 0)
917 switch (pfs->pfs_type) {
920 * This is for the process-specific sub-directories.
921 * all that is needed to is copy out all the entries
922 * from the procent[] table (top of this file).
924 error = linprocfs_readdir_proc(ap);
928 * This is for the root of the procfs filesystem
929 * what is needed is a special entry for "self"
930 * followed by an entry for each process on allproc
932 error = linprocfs_readdir_root(ap);
935 error = linprocfs_readdir_net(ap);
938 error = linprocfs_readdir_sys(ap);
941 error = linprocfs_readdir_syskernel(ap);
953 linprocfs_readdir_proc(struct vop_readdir_args *ap)
956 int error, i, retval;
958 struct proc_target *pt;
959 struct uio *uio = ap->a_uio;
961 pfs = VTOPFS(ap->a_vp);
962 p = PFIND(pfs->pfs_pid);
965 if (!PRISON_CHECK(ap->a_cred, p->p_ucred))
971 for (pt = &proc_targets[i];
972 !error && uio->uio_resid > 0 && i < nproc_targets; pt++, i++) {
973 if (pt->pt_valid && (*pt->pt_valid)(p) == 0)
976 retval = vop_write_dirent(&error, uio,
977 PROCFS_FILENO(pfs->pfs_pid, pt->pt_pfstype), pt->pt_type,
978 pt->pt_namlen, pt->pt_name);
988 struct linprocfs_readdir_root_info {
997 * Scan the root directory by scanning all process
999 static int linprocfs_readdir_root_callback(struct proc *p, void *data);
1002 linprocfs_readdir_root(struct vop_readdir_args *ap)
1004 struct linprocfs_readdir_root_info info;
1005 struct uio *uio = ap->a_uio;
1009 info.i = uio->uio_offset;
1012 info.cred = ap->a_cred;
1014 while (info.pcnt < 12) {
1015 res = linprocfs_readdir_root_callback(NULL, &info);
1020 allproc_scan(linprocfs_readdir_root_callback, &info);
1022 uio->uio_offset = info.i;
1027 linprocfs_readdir_root_callback(struct proc *p, void *data)
1029 struct linprocfs_readdir_root_info *info = data;
1031 struct uio *uio = info->uio;
1034 char d_name_pid[20];
1038 switch (info->pcnt) {
1040 d_ino = PROCFS_FILENO(0, Proot);
1046 d_ino = PROCFS_FILENO(0, Proot);
1053 d_ino = PROCFS_FILENO(0, Proot);
1060 d_ino = PROCFS_FILENO(0, Pmeminfo);
1067 d_ino = PROCFS_FILENO(0, Pcpuinfo);
1074 d_ino = PROCFS_FILENO(0, Pstat);
1081 d_ino = PROCFS_FILENO(0, Puptime);
1088 d_ino = PROCFS_FILENO(0, Pversion);
1095 d_ino = PROCFS_FILENO(0, Ploadavg);
1101 d_ino = PROCFS_FILENO(0, Pnet);
1107 d_ino = PROCFS_FILENO(0, Psys);
1113 d_ino = PROCFS_FILENO(0, Pmounts);
1120 d_ino = PROCFS_FILENO(0, Pdevices);
1128 * Ignore processes that aren't in our prison
1130 if (PRISON_CHECK(info->cred, p->p_ucred) == 0)
1134 * Ignore processes that we do not want to be visible.
1136 if (ps_showallprocs == 0 &&
1137 info->cred->cr_uid != 0 &&
1138 info->cred->cr_uid != p->p_ucred->cr_uid) {
1143 * Skip processes we have already read (optimization)
1145 if (info->pcnt < info->i) {
1149 d_ino = PROCFS_FILENO(p->p_pid, Pproc);
1150 d_namlen = ksnprintf(d_name_pid, sizeof(d_name_pid),
1151 "%ld", (long)p->p_pid);
1152 d_name = d_name_pid;
1158 * Skip processes we have already read
1160 if (info->pcnt < info->i) {
1164 retval = vop_write_dirent(&info->error, info->uio,
1165 d_ino, d_type, d_namlen, d_name);
1167 ++info->pcnt; /* iterate proc candidates scanned */
1168 ++info->i; /* iterate entries written */
1170 if (retval || info->error || uio->uio_resid <= 0)
1176 * Scan the root directory by scanning all process
1178 static int linprocfs_readdir_net_callback(struct proc *p, void *data);
1181 linprocfs_readdir_net(struct vop_readdir_args *ap)
1183 struct linprocfs_readdir_root_info info;
1184 struct uio *uio = ap->a_uio;
1188 info.i = uio->uio_offset;
1191 info.cred = ap->a_cred;
1193 while (info.pcnt < 3) {
1194 res = linprocfs_readdir_net_callback(NULL, &info);
1199 uio->uio_offset = info.i;
1204 linprocfs_readdir_net_callback(struct proc *p, void *data)
1206 struct linprocfs_readdir_root_info *info = data;
1208 struct uio *uio = info->uio;
1214 switch (info->pcnt) {
1216 d_ino = PROCFS_FILENO(0, Pnet);
1222 d_ino = PROCFS_FILENO(0, Proot);
1229 d_ino = PROCFS_FILENO(0, Pnet);
1243 * Skip processes we have already read
1245 if (info->pcnt < info->i) {
1249 retval = vop_write_dirent(&info->error, info->uio,
1250 d_ino, d_type, d_namlen, d_name);
1252 ++info->pcnt; /* iterate proc candidates scanned */
1253 ++info->i; /* iterate entries written */
1255 if (retval || info->error || uio->uio_resid <= 0)
1267 * Scan the root directory by scanning all process
1269 static int linprocfs_readdir_sys_callback(struct proc *p, void *data);
1272 linprocfs_readdir_sys(struct vop_readdir_args *ap)
1274 struct linprocfs_readdir_root_info info;
1275 struct uio *uio = ap->a_uio;
1279 info.i = uio->uio_offset;
1282 info.cred = ap->a_cred;
1284 while (info.pcnt < 3) {
1285 res = linprocfs_readdir_sys_callback(NULL, &info);
1290 uio->uio_offset = info.i;
1295 linprocfs_readdir_sys_callback(struct proc *p, void *data)
1297 struct linprocfs_readdir_root_info *info = data;
1299 struct uio *uio = info->uio;
1305 switch (info->pcnt) {
1307 d_ino = PROCFS_FILENO(0, Psys);
1313 d_ino = PROCFS_FILENO(0, Proot);
1320 d_ino = PROCFS_FILENO(0, Psyskernel);
1334 * Skip processes we have already read
1336 if (info->pcnt < info->i) {
1340 retval = vop_write_dirent(&info->error, info->uio,
1341 d_ino, d_type, d_namlen, d_name);
1343 ++info->pcnt; /* iterate proc candidates scanned */
1344 ++info->i; /* iterate entries written */
1346 if (retval || info->error || uio->uio_resid <= 0)
1356 * Scan the root directory by scanning all process
1358 static int linprocfs_readdir_syskernel_callback(struct proc *p, void *data);
1361 linprocfs_readdir_syskernel(struct vop_readdir_args *ap)
1363 struct linprocfs_readdir_root_info info;
1364 struct uio *uio = ap->a_uio;
1368 info.i = uio->uio_offset;
1371 info.cred = ap->a_cred;
1373 while (info.pcnt < 6) {
1374 res = linprocfs_readdir_syskernel_callback(NULL, &info);
1379 uio->uio_offset = info.i;
1384 linprocfs_readdir_syskernel_callback(struct proc *p, void *data)
1386 struct linprocfs_readdir_root_info *info = data;
1388 struct uio *uio = info->uio;
1394 switch (info->pcnt) {
1396 d_ino = PROCFS_FILENO(0, Psyskernel);
1402 d_ino = PROCFS_FILENO(0, Psys);
1409 d_ino = PROCFS_FILENO(0, Posrelease);
1411 d_name = "osrelease";
1416 d_ino = PROCFS_FILENO(0, Postype);
1423 d_ino = PROCFS_FILENO(0, Pversion);
1430 d_ino = PROCFS_FILENO(0, Ppidmax);
1444 * Skip processes we have already read
1446 if (info->pcnt < info->i) {
1450 retval = vop_write_dirent(&info->error, info->uio,
1451 d_ino, d_type, d_namlen, d_name);
1453 ++info->pcnt; /* iterate proc candidates scanned */
1454 ++info->i; /* iterate entries written */
1456 if (retval || info->error || uio->uio_resid <= 0)
1462 * readlink reads the link of `self' or `exe'
1465 linprocfs_readlink(struct vop_readlink_args *ap)
1467 char buf[16]; /* should be enough */
1469 struct vnode *vp = ap->a_vp;
1470 struct nchandle *nchp;
1471 struct pfsnode *pfs = VTOPFS(vp);
1472 char *fullpath, *freepath;
1475 switch (pfs->pfs_type) {
1477 if (pfs->pfs_fileno != PROCFS_FILENO(0, Pself))
1480 len = ksnprintf(buf, sizeof(buf), "%ld", (long)curproc->p_pid);
1482 return (uiomove(buf, len, ap->a_uio));
1484 * There _should_ be no way for an entire process to disappear
1488 procp = PFIND(pfs->pfs_pid);
1489 if (procp == NULL || procp->p_ucred == NULL) {
1490 kprintf("linprocfs_readlink: pid %d disappeared\n",
1492 return (uiomove("unknown", sizeof("unknown") - 1,
1495 error = cache_fullpath(procp, &procp->p_textnch, &fullpath, &freepath);
1497 return (uiomove("unknown", sizeof("unknown") - 1,
1499 error = uiomove(fullpath, strlen(fullpath), ap->a_uio);
1500 kfree(freepath, M_TEMP);
1503 procp = PFIND(pfs->pfs_pid);
1504 if (procp == NULL || procp->p_ucred == NULL) {
1505 kprintf("linprocfs_readlink: pid %d disappeared\n",
1507 return (uiomove("unknown", sizeof("unknown") - 1,
1510 error = cache_fullpath(procp, &procp->p_fd->fd_ncdir, &fullpath, &freepath);
1512 return (uiomove("unknown", sizeof("unknown") - 1,
1514 error = uiomove(fullpath, strlen(fullpath), ap->a_uio);
1515 kfree(freepath, M_TEMP);
1518 procp = PFIND(pfs->pfs_pid);
1519 if (procp == NULL || procp->p_ucred == NULL) {
1520 kprintf("linprocfs_readlink: pid %d disappeared\n",
1522 return (uiomove("unknown", sizeof("unknown") - 1,
1525 nchp = jailed(procp->p_ucred) ? &procp->p_fd->fd_njdir : &procp->p_fd->fd_nrdir;
1526 error = cache_fullpath(procp, nchp, &fullpath, &freepath);
1528 return (uiomove("unknown", sizeof("unknown") - 1,
1530 error = uiomove(fullpath, strlen(fullpath), ap->a_uio);
1531 kfree(freepath, M_TEMP);
1534 procp = PFIND(pfs->pfs_pid);
1535 if (procp == NULL || procp->p_ucred == NULL) {
1536 kprintf("linprocfs_readlink: pid %d disappeared\n",
1538 return (uiomove("unknown", sizeof("unknown") - 1,
1541 if (procp == curproc) {
1542 return (uiomove("/dev/fd", sizeof("/dev/fd") - 1,
1545 return (uiomove("unknown", sizeof("unknown") - 1,
1556 * convert decimal ascii to pid_t
1559 atopid(const char *b, u_int len)
1565 if (c < '0' || c > '9')
1567 p = 10 * p + (c - '0');