2 * Copyright (c) 1993, 1995 Jan-Simon Pendry
3 * Copyright (c) 1993, 1995
4 * The Regents of the University of California. All rights reserved.
6 * This code is derived from software contributed to Berkeley by
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
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13 * notice, this list of conditions and the following disclaimer.
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15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
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18 * must display the following acknowledgement:
19 * This product includes software developed by the University of
20 * California, Berkeley and its contributors.
21 * 4. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * @(#)procfs_vnops.c 8.18 (Berkeley) 5/21/95
39 * $FreeBSD: src/sys/miscfs/procfs/procfs_vnops.c,v 1.76.2.7 2002/01/22 17:22:59 nectar Exp $
40 * $DragonFly: src/sys/vfs/procfs/procfs_vnops.c,v 1.36 2006/08/19 17:27:24 dillon Exp $
44 * procfs vnode interface
47 #include <sys/param.h>
48 #include <sys/systm.h>
50 #include <sys/kernel.h>
52 #include <sys/fcntl.h>
54 #include <sys/signalvar.h>
55 #include <sys/vnode.h>
57 #include <sys/mount.h>
58 #include <sys/namei.h>
59 #include <sys/dirent.h>
60 #include <sys/malloc.h>
61 #include <machine/reg.h>
62 #include <vm/vm_zone.h>
63 #include <vfs/procfs/procfs.h>
64 #include <sys/pioctl.h>
66 #include <machine/limits.h>
68 static int procfs_access (struct vop_access_args *);
69 static int procfs_badop (struct vop_generic_args *);
70 static int procfs_bmap (struct vop_bmap_args *);
71 static int procfs_close (struct vop_close_args *);
72 static int procfs_getattr (struct vop_getattr_args *);
73 static int procfs_inactive (struct vop_inactive_args *);
74 static int procfs_ioctl (struct vop_ioctl_args *);
75 static int procfs_lookup (struct vop_old_lookup_args *);
76 static int procfs_open (struct vop_open_args *);
77 static int procfs_print (struct vop_print_args *);
78 static int procfs_readdir (struct vop_readdir_args *);
79 static int procfs_readlink (struct vop_readlink_args *);
80 static int procfs_reclaim (struct vop_reclaim_args *);
81 static int procfs_setattr (struct vop_setattr_args *);
83 static int procfs_readdir_proc(struct vop_readdir_args *);
84 static int procfs_readdir_root(struct vop_readdir_args *);
87 * procfs vnode operations.
89 struct vop_ops procfs_vnode_vops = {
90 .vop_default = vop_defaultop,
91 .vop_access = procfs_access,
92 .vop_advlock = (void *)procfs_badop,
93 .vop_bmap = procfs_bmap,
94 .vop_close = procfs_close,
95 .vop_old_create = (void *)procfs_badop,
96 .vop_getattr = procfs_getattr,
97 .vop_inactive = procfs_inactive,
98 .vop_old_link = (void *)procfs_badop,
99 .vop_old_lookup = procfs_lookup,
100 .vop_old_mkdir = (void *)procfs_badop,
101 .vop_old_mknod = (void *)procfs_badop,
102 .vop_open = procfs_open,
103 .vop_pathconf = vop_stdpathconf,
104 .vop_print = procfs_print,
105 .vop_read = procfs_rw,
106 .vop_readdir = procfs_readdir,
107 .vop_readlink = procfs_readlink,
108 .vop_reclaim = procfs_reclaim,
109 .vop_old_remove = (void *)procfs_badop,
110 .vop_old_rename = (void *)procfs_badop,
111 .vop_old_rmdir = (void *)procfs_badop,
112 .vop_setattr = procfs_setattr,
113 .vop_old_symlink = (void *)procfs_badop,
114 .vop_write = (void *)procfs_rw,
115 .vop_ioctl = procfs_ioctl
120 * This is a list of the valid names in the
121 * process-specific sub-directories. It is
122 * used in procfs_lookup and procfs_readdir
124 static struct proc_target {
129 int (*pt_valid) (struct proc *p);
131 #define N(s) sizeof(s)-1, s
132 /* name type validp */
133 { DT_DIR, N("."), Pproc, NULL },
134 { DT_DIR, N(".."), Proot, NULL },
135 { DT_REG, N("mem"), Pmem, NULL },
136 { DT_REG, N("regs"), Pregs, procfs_validregs },
137 { DT_REG, N("fpregs"), Pfpregs, procfs_validfpregs },
138 { DT_REG, N("dbregs"), Pdbregs, procfs_validdbregs },
139 { DT_REG, N("ctl"), Pctl, NULL },
140 { DT_REG, N("status"), Pstatus, NULL },
141 { DT_REG, N("note"), Pnote, NULL },
142 { DT_REG, N("notepg"), Pnotepg, NULL },
143 { DT_REG, N("map"), Pmap, procfs_validmap },
144 { DT_REG, N("etype"), Ptype, procfs_validtype },
145 { DT_REG, N("cmdline"), Pcmdline, NULL },
146 { DT_REG, N("rlimit"), Prlimit, NULL },
147 { DT_LNK, N("file"), Pfile, NULL },
150 static const int nproc_targets = sizeof(proc_targets) / sizeof(proc_targets[0]);
152 static pid_t atopid (const char *, u_int);
155 * set things up for doing i/o on
156 * the pfsnode (vp). (vp) is locked
157 * on entry, and should be left locked
160 * for procfs we don't need to do anything
161 * in particular for i/o. all that is done
162 * is to support exclusive open on process
165 * procfs_open(struct vnode *a_vp, int a_mode, struct ucred *a_cred)
168 procfs_open(struct vop_open_args *ap)
170 struct pfsnode *pfs = VTOPFS(ap->a_vp);
171 struct proc *p1, *p2;
173 p2 = PFIND(pfs->pfs_pid);
176 if (pfs->pfs_pid && !PRISON_CHECK(ap->a_cred, p2->p_ucred))
179 switch (pfs->pfs_type) {
181 if (((pfs->pfs_flags & FWRITE) && (ap->a_mode & O_EXCL)) ||
182 ((pfs->pfs_flags & O_EXCL) && (ap->a_mode & FWRITE)))
187 /* Can't trace a process that's currently exec'ing. */
188 if ((p2->p_flag & P_INEXEC) != 0)
190 if (!CHECKIO(p1, p2) || p_trespass(ap->a_cred, p2->p_ucred))
193 if (ap->a_mode & FWRITE)
194 pfs->pfs_flags = ap->a_mode & (FWRITE|O_EXCL);
202 return (vop_stdopen(ap));
206 * close the pfsnode (vp) after doing i/o.
207 * (vp) is not locked on entry or exit.
209 * nothing to do for procfs other than undo
210 * any exclusive open flag (see _open above).
212 * procfs_close(struct vnode *a_vp, int a_fflag, struct ucred *a_cred)
215 procfs_close(struct vop_close_args *ap)
217 struct pfsnode *pfs = VTOPFS(ap->a_vp);
220 switch (pfs->pfs_type) {
222 if ((ap->a_fflag & FWRITE) && (pfs->pfs_flags & O_EXCL))
223 pfs->pfs_flags &= ~(FWRITE|O_EXCL);
225 * This rather complicated-looking code is trying to
226 * determine if this was the last close on this particular
227 * vnode. While one would expect v_usecount to be 1 at
228 * that point, it seems that (according to John Dyson)
229 * the VM system will bump up the usecount. So: if the
230 * usecount is 2, and VOBJBUF is set, then this is really
231 * the last close. Otherwise, if the usecount is < 2
232 * then it is definitely the last close.
233 * If this is the last close, then it checks to see if
234 * the target process has PF_LINGER set in p_pfsflags,
235 * if this is *not* the case, then the process' stop flags
236 * are cleared, and the process is woken up. This is
237 * to help prevent the case where a process has been
238 * told to stop on an event, but then the requesting process
239 * has gone away or forgotten about it.
241 if ((ap->a_vp->v_usecount < 2)
242 && (p = pfind(pfs->pfs_pid))
243 && !(p->p_pfsflags & PF_LINGER)) {
253 return (vop_stdclose(ap));
257 * do an ioctl operation on a pfsnode (vp).
258 * (vp) is not locked on entry or exit.
261 procfs_ioctl(struct vop_ioctl_args *ap)
263 struct pfsnode *pfs = VTOPFS(ap->a_vp);
268 struct procfs_status *psp;
271 procp = pfind(pfs->pfs_pid);
278 /* Can't trace a process that's currently exec'ing. */
279 if ((procp->p_flag & P_INEXEC) != 0)
281 if (!CHECKIO(p, procp) || p_trespass(ap->a_cred, procp->p_ucred))
284 switch (ap->a_command) {
286 procp->p_stops |= *(unsigned int*)ap->a_data;
289 procp->p_stops &= ~*(unsigned int*)ap->a_data;
293 * NFLAGS is "non-suser_xxx flags" -- currently, only
294 * PFS_ISUGID ("ignore set u/g id");
296 #define NFLAGS (PF_ISUGID)
297 flags = (unsigned char)*(unsigned int*)ap->a_data;
298 if (flags & NFLAGS && (error = suser_cred(ap->a_cred, 0)))
300 procp->p_pfsflags = flags;
303 *(unsigned int*)ap->a_data = (unsigned int)procp->p_pfsflags;
306 psp = (struct procfs_status *)ap->a_data;
307 psp->state = (procp->p_step == 0);
308 psp->flags = procp->p_pfsflags;
309 psp->events = procp->p_stops;
311 psp->why = procp->p_stype;
312 psp->val = procp->p_xstat;
314 psp->why = psp->val = 0; /* Not defined values */
318 psp = (struct procfs_status *)ap->a_data;
319 if (procp->p_step == 0) {
320 error = tsleep(&procp->p_stype, PCATCH, "piocwait", 0);
324 psp->state = 1; /* It stopped */
325 psp->flags = procp->p_pfsflags;
326 psp->events = procp->p_stops;
327 psp->why = procp->p_stype; /* why it stopped */
328 psp->val = procp->p_xstat; /* any extra info */
330 case PIOCCONT: /* Restart a proc */
331 if (procp->p_step == 0)
332 return EINVAL; /* Can only start a stopped process */
333 if ((signo = *(int*)ap->a_data) != 0) {
334 if (signo >= NSIG || signo <= 0)
336 psignal(procp, signo);
339 wakeup(&procp->p_step);
348 * do block mapping for pfsnode (vp).
349 * since we don't use the buffer cache
350 * for procfs this function should never
351 * be called. in any case, it's not clear
352 * what part of the kernel ever makes use
353 * of this function. for sanity, this is the
354 * usual no-op bmap, although returning
355 * (EIO) would be a reasonable alternative.
357 * procfs_bmap(struct vnode *a_vp, off_t a_loffset, struct vnode **a_vpp,
358 * off_t *a_doffsetp, int *a_runp)
361 procfs_bmap(struct vop_bmap_args *ap)
363 if (ap->a_vpp != NULL)
364 *ap->a_vpp = ap->a_vp;
365 if (ap->a_doffsetp != NULL)
366 *ap->a_doffsetp = ap->a_loffset;
367 if (ap->a_runp != NULL)
369 if (ap->a_runb != NULL)
375 * procfs_inactive is called when the pfsnode
376 * is vrele'd and the reference count goes
377 * to zero. (vp) will be on the vnode free
378 * list, so to get it back vget() must be
381 * (vp) is locked on entry, but must be unlocked on exit.
383 * procfs_inactive(struct vnode *a_vp, struct thread *a_td)
386 procfs_inactive(struct vop_inactive_args *ap)
388 /*struct vnode *vp = ap->a_vp;*/
394 * _reclaim is called when getnewvnode()
395 * wants to make use of an entry on the vnode
396 * free list. at this time the filesystem needs
397 * to free any private data and remove the node
398 * from any private lists.
400 * procfs_reclaim(struct vnode *a_vp)
403 procfs_reclaim(struct vop_reclaim_args *ap)
405 return (procfs_freevp(ap->a_vp));
409 * _print is used for debugging.
410 * just print a readable description
413 * procfs_print(struct vnode *a_vp)
416 procfs_print(struct vop_print_args *ap)
418 struct pfsnode *pfs = VTOPFS(ap->a_vp);
420 printf("tag VT_PROCFS, type %d, pid %ld, mode %x, flags %lx\n",
421 pfs->pfs_type, (long)pfs->pfs_pid, pfs->pfs_mode, pfs->pfs_flags);
426 * generic entry point for unsupported operations
429 procfs_badop(struct vop_generic_args *ap)
435 * Invent attributes for pfsnode (vp) and store
437 * Directories lengths are returned as zero since
438 * any real length would require the genuine size
439 * to be computed, and nothing cares anyway.
441 * this is relatively minimal for procfs.
443 * procfs_getattr(struct vnode *a_vp, struct vattr *a_vap,
444 * struct ucred *a_cred, struct thread *a_td)
447 procfs_getattr(struct vop_getattr_args *ap)
449 struct pfsnode *pfs = VTOPFS(ap->a_vp);
450 struct vattr *vap = ap->a_vap;
455 * First make sure that the process and its credentials
458 switch (pfs->pfs_type) {
465 procp = PFIND(pfs->pfs_pid);
466 if (procp == NULL || procp->p_ucred == NULL)
472 /* start by zeroing out the attributes */
475 /* next do all the common fields */
476 vap->va_type = ap->a_vp->v_type;
477 vap->va_mode = pfs->pfs_mode;
478 vap->va_fileid = pfs->pfs_fileno;
480 vap->va_blocksize = PAGE_SIZE;
481 vap->va_bytes = vap->va_size = 0;
482 vap->va_fsid = ap->a_vp->v_mount->mnt_stat.f_fsid.val[0];
485 * Make all times be current TOD.
486 * It would be possible to get the process start
487 * time from the p_stat structure, but there's
488 * no "file creation" time stamp anyway, and the
489 * p_stat structure is not addressible if u. gets
490 * swapped out for that process.
492 nanotime(&vap->va_ctime);
493 vap->va_atime = vap->va_mtime = vap->va_ctime;
496 * If the process has exercised some setuid or setgid
497 * privilege, then rip away read/write permission so
498 * that only root can gain access.
500 switch (pfs->pfs_type) {
506 if (procp->p_flag & P_SUGID)
507 vap->va_mode &= ~((VREAD|VWRITE)|
509 ((VREAD|VWRITE)>>6));
516 * now do the object specific fields
518 * The size could be set from struct reg, but it's hardly
519 * worth the trouble, and it puts some (potentially) machine
520 * dependent data into this machine-independent code. If it
521 * becomes important then this function should break out into
522 * a per-file stat function in the corresponding .c file.
527 vap->va_uid = procp->p_ucred->cr_uid;
528 vap->va_gid = procp->p_ucred->cr_gid;
531 switch (pfs->pfs_type) {
534 * Set nlink to 1 to tell fts(3) we don't actually know.
539 vap->va_size = vap->va_bytes = DEV_BSIZE;
543 char buf[16]; /* should be enough */
546 vap->va_size = vap->va_bytes =
547 snprintf(buf, sizeof(buf), "%ld", (long)curproc->p_pid);
552 vap->va_nlink = nproc_targets;
553 vap->va_size = vap->va_bytes = DEV_BSIZE;
557 char *fullpath, *freepath;
558 error = vn_fullpath(procp, NULL, &fullpath, &freepath);
560 vap->va_size = strlen(fullpath);
561 free(freepath, M_TEMP);
563 vap->va_size = sizeof("unknown") - 1;
566 vap->va_bytes = vap->va_size;
572 * If we denied owner access earlier, then we have to
573 * change the owner to root - otherwise 'ps' and friends
574 * will break even though they are setgid kmem. *SIGH*
576 if (procp->p_flag & P_SUGID)
579 vap->va_uid = procp->p_ucred->cr_uid;
583 vap->va_bytes = vap->va_size = sizeof(struct reg);
587 vap->va_bytes = vap->va_size = sizeof(struct fpreg);
591 vap->va_bytes = vap->va_size = sizeof(struct dbreg);
605 panic("procfs_getattr");
612 * procfs_setattr(struct vnode *a_vp, struct vattr *a_vap,
613 * struct ucred *a_cred, struct thread *a_td)
616 procfs_setattr(struct vop_setattr_args *ap)
618 if (ap->a_vap->va_flags != VNOVAL)
622 * just fake out attribute setting
623 * it's not good to generate an error
624 * return, otherwise things like creat()
625 * will fail when they try to set the
626 * file length to 0. worse, this means
627 * that echo $note > /proc/$pid/note will fail.
634 * implement access checking.
636 * something very similar to this code is duplicated
637 * throughout the 4bsd kernel and should be moved
638 * into kern/vfs_subr.c sometime.
640 * actually, the check for super-user is slightly
641 * broken since it will allow read access to write-only
642 * objects. this doesn't cause any particular trouble
643 * but does mean that the i/o entry points need to check
644 * that the operation really does make sense.
646 * procfs_access(struct vnode *a_vp, int a_mode, struct ucred *a_cred,
647 * struct thread *a_td)
650 procfs_access(struct vop_access_args *ap)
657 * If you're the super-user,
658 * you always get access.
660 if (ap->a_cred->cr_uid == 0)
664 error = VOP_GETATTR(ap->a_vp, vap);
669 * Access check is based on only one of owner, group, public.
670 * If not owner, then check group. If not a member of the
671 * group, then check public access.
673 if (ap->a_cred->cr_uid != vap->va_uid) {
678 gp = ap->a_cred->cr_groups;
679 for (i = 0; i < ap->a_cred->cr_ngroups; i++, gp++)
680 if (vap->va_gid == *gp)
687 if ((vap->va_mode & ap->a_mode) == ap->a_mode)
694 * lookup. this is incredibly complicated in the general case, however
695 * for most pseudo-filesystems very little needs to be done.
697 * procfs_lookup(struct vnode *a_dvp, struct vnode **a_vpp,
698 * struct componentname *a_cnp)
701 procfs_lookup(struct vop_old_lookup_args *ap)
703 struct componentname *cnp = ap->a_cnp;
704 struct vnode **vpp = ap->a_vpp;
705 struct vnode *dvp = ap->a_dvp;
706 char *pname = cnp->cn_nameptr;
707 /* struct proc *curp = cnp->cn_proc; */
708 struct proc_target *pt;
717 if (cnp->cn_nameiop == NAMEI_DELETE || cnp->cn_nameiop == NAMEI_RENAME)
721 if (cnp->cn_namelen == 1 && *pname == '.') {
728 switch (pfs->pfs_type) {
730 if (cnp->cn_flags & CNP_ISDOTDOT)
733 if (CNEQ(cnp, "curproc", 7)) {
734 error = procfs_allocvp(dvp->v_mount, vpp, 0, Pcurproc);
738 pid = atopid(pname, cnp->cn_namelen);
746 if (!PRISON_CHECK(ap->a_cnp->cn_cred, p->p_ucred))
749 if (ps_showallprocs == 0 && ap->a_cnp->cn_cred->cr_uid != 0 &&
750 ap->a_cnp->cn_cred->cr_uid != p->p_ucred->cr_uid)
753 error = procfs_allocvp(dvp->v_mount, vpp, pid, Pproc);
757 if (cnp->cn_flags & CNP_ISDOTDOT) {
758 error = procfs_root(dvp->v_mount, vpp);
762 p = PFIND(pfs->pfs_pid);
766 if (!PRISON_CHECK(ap->a_cnp->cn_cred, p->p_ucred))
769 if (ps_showallprocs == 0 && ap->a_cnp->cn_cred->cr_uid != 0 &&
770 ap->a_cnp->cn_cred->cr_uid != p->p_ucred->cr_uid)
773 for (pt = proc_targets, i = 0; i < nproc_targets; pt++, i++) {
774 if (cnp->cn_namelen == pt->pt_namlen &&
775 bcmp(pt->pt_name, pname, cnp->cn_namelen) == 0 &&
776 (pt->pt_valid == NULL || (*pt->pt_valid)(p)))
781 error = procfs_allocvp(dvp->v_mount, vpp, pfs->pfs_pid,
789 if (cnp->cn_nameiop == NAMEI_LOOKUP)
794 * If no error occured *vpp will hold a referenced locked vnode.
795 * dvp was passed to us locked and *vpp must be returned locked.
796 * If *vpp != dvp then we should unlock dvp if (1) this is not the
797 * last component or (2) CNP_LOCKPARENT is not set.
800 if (error == 0 && *vpp != dvp) {
801 if ((cnp->cn_flags & CNP_LOCKPARENT) == 0) {
802 cnp->cn_flags |= CNP_PDIRUNLOCK;
810 * Does this process have a text file?
813 procfs_validfile(struct proc *p)
815 return (procfs_findtextvp(p) != NULLVP);
819 * readdir() returns directory entries from pfsnode (vp).
821 * We generate just one directory entry at a time, as it would probably
822 * not pay off to buffer several entries locally to save uiomove calls.
824 * procfs_readdir(struct vnode *a_vp, struct uio *a_uio, struct ucred *a_cred,
825 * int *a_eofflag, int *a_ncookies, u_long **a_cookies)
828 procfs_readdir(struct vop_readdir_args *ap)
833 if (ap->a_uio->uio_offset < 0 || ap->a_uio->uio_offset > INT_MAX)
835 if ((error = vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY)) != 0)
837 pfs = VTOPFS(ap->a_vp);
839 switch (pfs->pfs_type) {
842 * this is for the process-specific sub-directories.
843 * all that is needed to is copy out all the entries
844 * from the procent[] table (top of this file).
846 error = procfs_readdir_proc(ap);
850 * this is for the root of the procfs filesystem
851 * what is needed is a special entry for "curproc"
852 * followed by an entry for each process on allproc
854 error = procfs_readdir_root(ap);
866 procfs_readdir_proc(struct vop_readdir_args *ap)
869 int error, i, retval;
871 struct proc_target *pt;
872 struct uio *uio = ap->a_uio;
874 pfs = VTOPFS(ap->a_vp);
875 p = PFIND(pfs->pfs_pid);
878 if (!PRISON_CHECK(ap->a_cred, p->p_ucred))
882 i = (int)uio->uio_offset;
886 for (pt = &proc_targets[i];
887 !error && uio->uio_resid > 0 && i < nproc_targets; pt++, i++) {
888 if (pt->pt_valid && (*pt->pt_valid)(p) == 0)
891 retval = vop_write_dirent(&error, uio,
892 PROCFS_FILENO(pfs->pfs_pid, pt->pt_pfstype), pt->pt_type,
893 pt->pt_namlen, pt->pt_name);
898 uio->uio_offset = (off_t)i;
903 struct procfs_readdir_root_info {
911 static int procfs_readdir_root_callback(struct proc *p, void *data);
914 procfs_readdir_root(struct vop_readdir_args *ap)
916 struct procfs_readdir_root_info info;
917 struct uio *uio = ap->a_uio;
921 info.i = (int)uio->uio_offset;
928 info.cred = ap->a_cred;
929 while (info.pcnt < 3) {
930 res = procfs_readdir_root_callback(NULL, &info);
935 allproc_scan(procfs_readdir_root_callback, &info);
936 uio->uio_offset = (off_t)info.i;
942 procfs_readdir_root_callback(struct proc *p, void *data)
944 struct procfs_readdir_root_info *info = data;
955 if (uio->uio_resid <= 0 || info->error)
958 switch (info->pcnt) {
960 d_ino = PROCFS_FILENO(0, Proot);
966 d_ino = PROCFS_FILENO(0, Proot);
973 d_ino = PROCFS_FILENO(0, Pcurproc);
981 if (!PRISON_CHECK(info->cred, p->p_ucred))
983 if (ps_showallprocs == 0 &&
984 info->cred->cr_uid != 0 &&
985 info->cred->cr_uid != p->p_ucred->cr_uid) {
990 * Skip entries we have already returned (optimization)
992 if (info->pcnt < info->i) {
997 d_ino = PROCFS_FILENO(p->p_pid, Pproc);
998 d_namlen = snprintf(d_name_pid, sizeof(d_name_pid),
999 "%ld", (long)p->p_pid);
1000 d_name = d_name_pid;
1006 * Skip entries we have already returned (optimization)
1008 if (info->pcnt < info->i) {
1013 retval = vop_write_dirent(&info->error, uio,
1014 d_ino, d_type, d_namlen, d_name);
1023 * readlink reads the link of `curproc' or `file'
1026 procfs_readlink(struct vop_readlink_args *ap)
1028 char buf[16]; /* should be enough */
1030 struct vnode *vp = ap->a_vp;
1031 struct pfsnode *pfs = VTOPFS(vp);
1032 char *fullpath, *freepath;
1035 switch (pfs->pfs_type) {
1037 if (pfs->pfs_fileno != PROCFS_FILENO(0, Pcurproc))
1040 len = snprintf(buf, sizeof(buf), "%ld", (long)curproc->p_pid);
1042 return (uiomove(buf, len, ap->a_uio));
1044 * There _should_ be no way for an entire process to disappear
1048 procp = PFIND(pfs->pfs_pid);
1049 if (procp == NULL || procp->p_ucred == NULL) {
1050 printf("procfs_readlink: pid %d disappeared\n",
1052 return (uiomove("unknown", sizeof("unknown") - 1,
1055 error = vn_fullpath(procp, NULL, &fullpath, &freepath);
1057 return (uiomove("unknown", sizeof("unknown") - 1,
1059 error = uiomove(fullpath, strlen(fullpath), ap->a_uio);
1060 free(freepath, M_TEMP);
1068 * convert decimal ascii to pid_t
1071 atopid(const char *b, u_int len)
1077 if (c < '0' || c > '9')
1079 p = 10 * p + (c - '0');