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
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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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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
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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 1.43 2007/05/06 19:23:35 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>
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 lwp *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 * v_opencount determines the last real close on the vnode.
227 * If this is the last close, then it checks to see if
228 * the target process has PF_LINGER set in p_pfsflags,
229 * if this is *not* the case, then the process' stop flags
230 * are cleared, and the process is woken up. This is
231 * to help prevent the case where a process has been
232 * told to stop on an event, but then the requesting process
233 * has gone away or forgotten about it.
235 if ((ap->a_vp->v_opencount < 2)
236 && (p = pfind(pfs->pfs_pid))
237 && !(p->p_pfsflags & PF_LINGER)) {
247 return (vop_stdclose(ap));
251 * do an ioctl operation on a pfsnode (vp).
252 * (vp) is not locked on entry or exit.
255 procfs_ioctl(struct vop_ioctl_args *ap)
257 struct pfsnode *pfs = VTOPFS(ap->a_vp);
262 struct procfs_status *psp;
265 procp = pfind(pfs->pfs_pid);
272 /* Can't trace a process that's currently exec'ing. */
273 if ((procp->p_flag & P_INEXEC) != 0)
275 if (!CHECKIO(p, procp) || p_trespass(ap->a_cred, procp->p_ucred))
278 switch (ap->a_command) {
280 procp->p_stops |= *(unsigned int*)ap->a_data;
283 procp->p_stops &= ~*(unsigned int*)ap->a_data;
287 * NFLAGS is "non-suser_xxx flags" -- currently, only
288 * PFS_ISUGID ("ignore set u/g id");
290 #define NFLAGS (PF_ISUGID)
291 flags = (unsigned char)*(unsigned int*)ap->a_data;
292 if (flags & NFLAGS && (error = suser_cred(ap->a_cred, 0)))
294 procp->p_pfsflags = flags;
297 *(unsigned int*)ap->a_data = (unsigned int)procp->p_pfsflags;
300 psp = (struct procfs_status *)ap->a_data;
301 psp->state = (procp->p_step == 0);
302 psp->flags = procp->p_pfsflags;
303 psp->events = procp->p_stops;
305 psp->why = procp->p_stype;
306 psp->val = procp->p_xstat;
308 psp->why = psp->val = 0; /* Not defined values */
312 psp = (struct procfs_status *)ap->a_data;
313 if (procp->p_step == 0) {
314 error = tsleep(&procp->p_stype, PCATCH, "piocwait", 0);
318 psp->state = 1; /* It stopped */
319 psp->flags = procp->p_pfsflags;
320 psp->events = procp->p_stops;
321 psp->why = procp->p_stype; /* why it stopped */
322 psp->val = procp->p_xstat; /* any extra info */
324 case PIOCCONT: /* Restart a proc */
325 if (procp->p_step == 0)
326 return EINVAL; /* Can only start a stopped process */
327 if ((signo = *(int*)ap->a_data) != 0) {
328 if (signo >= NSIG || signo <= 0)
330 ksignal(procp, signo);
333 wakeup(&procp->p_step);
342 * do block mapping for pfsnode (vp).
343 * since we don't use the buffer cache
344 * for procfs this function should never
345 * be called. in any case, it's not clear
346 * what part of the kernel ever makes use
347 * of this function. for sanity, this is the
348 * usual no-op bmap, although returning
349 * (EIO) would be a reasonable alternative.
351 * procfs_bmap(struct vnode *a_vp, off_t a_loffset, struct vnode **a_vpp,
352 * off_t *a_doffsetp, int *a_runp)
355 procfs_bmap(struct vop_bmap_args *ap)
357 if (ap->a_vpp != NULL)
358 *ap->a_vpp = ap->a_vp;
359 if (ap->a_doffsetp != NULL)
360 *ap->a_doffsetp = ap->a_loffset;
361 if (ap->a_runp != NULL)
363 if (ap->a_runb != NULL)
369 * procfs_inactive is called when the pfsnode
370 * is vrele'd and the reference count goes
371 * to zero. (vp) will be on the vnode free
372 * list, so to get it back vget() must be
375 * (vp) is locked on entry, but must be unlocked on exit.
377 * procfs_inactive(struct vnode *a_vp, struct thread *a_td)
380 procfs_inactive(struct vop_inactive_args *ap)
382 /*struct vnode *vp = ap->a_vp;*/
388 * _reclaim is called when getnewvnode()
389 * wants to make use of an entry on the vnode
390 * free list. at this time the filesystem needs
391 * to free any private data and remove the node
392 * from any private lists.
394 * procfs_reclaim(struct vnode *a_vp)
397 procfs_reclaim(struct vop_reclaim_args *ap)
399 return (procfs_freevp(ap->a_vp));
403 * _print is used for debugging.
404 * just print a readable description
407 * procfs_print(struct vnode *a_vp)
410 procfs_print(struct vop_print_args *ap)
412 struct pfsnode *pfs = VTOPFS(ap->a_vp);
414 kprintf("tag VT_PROCFS, type %d, pid %ld, mode %x, flags %lx\n",
415 pfs->pfs_type, (long)pfs->pfs_pid, pfs->pfs_mode, pfs->pfs_flags);
420 * generic entry point for unsupported operations
423 procfs_badop(struct vop_generic_args *ap)
429 * Invent attributes for pfsnode (vp) and store
431 * Directories lengths are returned as zero since
432 * any real length would require the genuine size
433 * to be computed, and nothing cares anyway.
435 * this is relatively minimal for procfs.
437 * procfs_getattr(struct vnode *a_vp, struct vattr *a_vap,
438 * struct ucred *a_cred, struct thread *a_td)
441 procfs_getattr(struct vop_getattr_args *ap)
443 struct pfsnode *pfs = VTOPFS(ap->a_vp);
444 struct vattr *vap = ap->a_vap;
449 * First make sure that the process and its credentials
452 switch (pfs->pfs_type) {
459 procp = PFIND(pfs->pfs_pid);
460 if (procp == NULL || procp->p_ucred == NULL)
466 /* start by zeroing out the attributes */
469 /* next do all the common fields */
470 vap->va_type = ap->a_vp->v_type;
471 vap->va_mode = pfs->pfs_mode;
472 vap->va_fileid = pfs->pfs_fileno;
474 vap->va_blocksize = PAGE_SIZE;
475 vap->va_bytes = vap->va_size = 0;
476 vap->va_fsid = ap->a_vp->v_mount->mnt_stat.f_fsid.val[0];
479 * Make all times be current TOD.
480 * It would be possible to get the process start
481 * time from the p_stat structure, but there's
482 * no "file creation" time stamp anyway, and the
483 * p_stat structure is not addressible if u. gets
484 * swapped out for that process.
486 nanotime(&vap->va_ctime);
487 vap->va_atime = vap->va_mtime = vap->va_ctime;
490 * If the process has exercised some setuid or setgid
491 * privilege, then rip away read/write permission so
492 * that only root can gain access.
494 switch (pfs->pfs_type) {
500 if (procp->p_flag & P_SUGID)
501 vap->va_mode &= ~((VREAD|VWRITE)|
503 ((VREAD|VWRITE)>>6));
510 * now do the object specific fields
512 * The size could be set from struct reg, but it's hardly
513 * worth the trouble, and it puts some (potentially) machine
514 * dependent data into this machine-independent code. If it
515 * becomes important then this function should break out into
516 * a per-file stat function in the corresponding .c file.
521 vap->va_uid = procp->p_ucred->cr_uid;
522 vap->va_gid = procp->p_ucred->cr_gid;
525 switch (pfs->pfs_type) {
528 * Set nlink to 1 to tell fts(3) we don't actually know.
533 vap->va_size = vap->va_bytes = DEV_BSIZE;
537 char buf[16]; /* should be enough */
540 vap->va_size = vap->va_bytes =
541 ksnprintf(buf, sizeof(buf), "%ld", (long)curproc->p_pid);
546 vap->va_nlink = nproc_targets;
547 vap->va_size = vap->va_bytes = DEV_BSIZE;
551 char *fullpath, *freepath;
552 error = vn_fullpath(procp, NULL, &fullpath, &freepath);
554 vap->va_size = strlen(fullpath);
555 kfree(freepath, M_TEMP);
557 vap->va_size = sizeof("unknown") - 1;
560 vap->va_bytes = vap->va_size;
566 * If we denied owner access earlier, then we have to
567 * change the owner to root - otherwise 'ps' and friends
568 * will break even though they are setgid kmem. *SIGH*
570 if (procp->p_flag & P_SUGID)
573 vap->va_uid = procp->p_ucred->cr_uid;
577 vap->va_bytes = vap->va_size = sizeof(struct reg);
581 vap->va_bytes = vap->va_size = sizeof(struct fpreg);
585 vap->va_bytes = vap->va_size = sizeof(struct dbreg);
599 panic("procfs_getattr");
606 * procfs_setattr(struct vnode *a_vp, struct vattr *a_vap,
607 * struct ucred *a_cred, struct thread *a_td)
610 procfs_setattr(struct vop_setattr_args *ap)
612 if (ap->a_vap->va_flags != VNOVAL)
616 * just fake out attribute setting
617 * it's not good to generate an error
618 * return, otherwise things like creat()
619 * will fail when they try to set the
620 * file length to 0. worse, this means
621 * that echo $note > /proc/$pid/note will fail.
628 * implement access checking.
630 * something very similar to this code is duplicated
631 * throughout the 4bsd kernel and should be moved
632 * into kern/vfs_subr.c sometime.
634 * actually, the check for super-user is slightly
635 * broken since it will allow read access to write-only
636 * objects. this doesn't cause any particular trouble
637 * but does mean that the i/o entry points need to check
638 * that the operation really does make sense.
640 * procfs_access(struct vnode *a_vp, int a_mode, struct ucred *a_cred,
641 * struct thread *a_td)
644 procfs_access(struct vop_access_args *ap)
651 * If you're the super-user,
652 * you always get access.
654 if (ap->a_cred->cr_uid == 0)
658 error = VOP_GETATTR(ap->a_vp, vap);
663 * Access check is based on only one of owner, group, public.
664 * If not owner, then check group. If not a member of the
665 * group, then check public access.
667 if (ap->a_cred->cr_uid != vap->va_uid) {
672 gp = ap->a_cred->cr_groups;
673 for (i = 0; i < ap->a_cred->cr_ngroups; i++, gp++)
674 if (vap->va_gid == *gp)
681 if ((vap->va_mode & ap->a_mode) == ap->a_mode)
688 * lookup. this is incredibly complicated in the general case, however
689 * for most pseudo-filesystems very little needs to be done.
691 * procfs_lookup(struct vnode *a_dvp, struct vnode **a_vpp,
692 * struct componentname *a_cnp)
695 procfs_lookup(struct vop_old_lookup_args *ap)
697 struct componentname *cnp = ap->a_cnp;
698 struct vnode **vpp = ap->a_vpp;
699 struct vnode *dvp = ap->a_dvp;
700 char *pname = cnp->cn_nameptr;
701 /* struct proc *curp = cnp->cn_proc; */
702 struct proc_target *pt;
712 if (cnp->cn_nameiop == NAMEI_DELETE || cnp->cn_nameiop == NAMEI_RENAME)
716 if (cnp->cn_namelen == 1 && *pname == '.') {
723 switch (pfs->pfs_type) {
725 if (cnp->cn_flags & CNP_ISDOTDOT)
728 if (CNEQ(cnp, "curproc", 7)) {
729 error = procfs_allocvp(dvp->v_mount, vpp, 0, Pcurproc);
733 pid = atopid(pname, cnp->cn_namelen);
741 if (!PRISON_CHECK(ap->a_cnp->cn_cred, p->p_ucred))
744 if (ps_showallprocs == 0 && ap->a_cnp->cn_cred->cr_uid != 0 &&
745 ap->a_cnp->cn_cred->cr_uid != p->p_ucred->cr_uid)
748 error = procfs_allocvp(dvp->v_mount, vpp, pid, Pproc);
752 if (cnp->cn_flags & CNP_ISDOTDOT) {
753 error = procfs_root(dvp->v_mount, vpp);
757 p = PFIND(pfs->pfs_pid);
761 lp = FIRST_LWP_IN_PROC(p);
763 if (!PRISON_CHECK(ap->a_cnp->cn_cred, p->p_ucred))
766 if (ps_showallprocs == 0 && ap->a_cnp->cn_cred->cr_uid != 0 &&
767 ap->a_cnp->cn_cred->cr_uid != p->p_ucred->cr_uid)
770 for (pt = proc_targets, i = 0; i < nproc_targets; pt++, i++) {
771 if (cnp->cn_namelen == pt->pt_namlen &&
772 bcmp(pt->pt_name, pname, cnp->cn_namelen) == 0 &&
773 (pt->pt_valid == NULL || (*pt->pt_valid)(lp)))
778 error = procfs_allocvp(dvp->v_mount, vpp, pfs->pfs_pid,
786 if (cnp->cn_nameiop == NAMEI_LOOKUP)
791 * If no error occured *vpp will hold a referenced locked vnode.
792 * dvp was passed to us locked and *vpp must be returned locked.
793 * If *vpp != dvp then we should unlock dvp if (1) this is not the
794 * last component or (2) CNP_LOCKPARENT is not set.
797 if (error == 0 && *vpp != dvp) {
798 if ((cnp->cn_flags & CNP_LOCKPARENT) == 0) {
799 cnp->cn_flags |= CNP_PDIRUNLOCK;
807 * Does this process have a text file?
810 procfs_validfile(struct lwp *lp)
812 return (procfs_findtextvp(lp->lwp_proc) != NULLVP);
816 * readdir() returns directory entries from pfsnode (vp).
818 * We generate just one directory entry at a time, as it would probably
819 * not pay off to buffer several entries locally to save uiomove calls.
821 * procfs_readdir(struct vnode *a_vp, struct uio *a_uio, struct ucred *a_cred,
822 * int *a_eofflag, int *a_ncookies, u_long **a_cookies)
825 procfs_readdir(struct vop_readdir_args *ap)
830 if (ap->a_uio->uio_offset < 0 || ap->a_uio->uio_offset > INT_MAX)
832 if ((error = vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY)) != 0)
834 pfs = VTOPFS(ap->a_vp);
836 switch (pfs->pfs_type) {
839 * this is for the process-specific sub-directories.
840 * all that is needed to is copy out all the entries
841 * from the procent[] table (top of this file).
843 error = procfs_readdir_proc(ap);
847 * this is for the root of the procfs filesystem
848 * what is needed is a special entry for "curproc"
849 * followed by an entry for each process on allproc
851 error = procfs_readdir_root(ap);
863 procfs_readdir_proc(struct vop_readdir_args *ap)
866 int error, i, retval;
869 struct proc_target *pt;
870 struct uio *uio = ap->a_uio;
872 pfs = VTOPFS(ap->a_vp);
873 p = PFIND(pfs->pfs_pid);
876 if (!PRISON_CHECK(ap->a_cred, p->p_ucred))
879 lp = FIRST_LWP_IN_PROC(p);
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)(lp) == 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 = ksnprintf(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 = ksnprintf(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 kprintf("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 kfree(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');