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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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.
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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 1.46 2007/11/20 21:03:50 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>
55 #include <sys/signalvar.h>
56 #include <sys/vnode.h>
58 #include <sys/mount.h>
59 #include <sys/namei.h>
60 #include <sys/dirent.h>
61 #include <sys/malloc.h>
63 #include <vm/vm_zone.h>
64 #include <vfs/procfs/procfs.h>
65 #include <sys/pioctl.h>
67 #include <sys/spinlock2.h>
69 #include <machine/limits.h>
71 static int procfs_access (struct vop_access_args *);
72 static int procfs_badop (struct vop_generic_args *);
73 static int procfs_bmap (struct vop_bmap_args *);
74 static int procfs_close (struct vop_close_args *);
75 static int procfs_getattr (struct vop_getattr_args *);
76 static int procfs_inactive (struct vop_inactive_args *);
77 static int procfs_ioctl (struct vop_ioctl_args *);
78 static int procfs_lookup (struct vop_old_lookup_args *);
79 static int procfs_open (struct vop_open_args *);
80 static int procfs_print (struct vop_print_args *);
81 static int procfs_readdir (struct vop_readdir_args *);
82 static int procfs_readlink (struct vop_readlink_args *);
83 static int procfs_reclaim (struct vop_reclaim_args *);
84 static int procfs_setattr (struct vop_setattr_args *);
86 static int procfs_readdir_proc(struct vop_readdir_args *);
87 static int procfs_readdir_root(struct vop_readdir_args *);
90 * procfs vnode operations.
92 struct vop_ops procfs_vnode_vops = {
93 .vop_default = vop_defaultop,
94 .vop_access = procfs_access,
95 .vop_advlock = (void *)procfs_badop,
96 .vop_bmap = procfs_bmap,
97 .vop_close = procfs_close,
98 .vop_old_create = (void *)procfs_badop,
99 .vop_getattr = procfs_getattr,
100 .vop_inactive = procfs_inactive,
101 .vop_old_link = (void *)procfs_badop,
102 .vop_old_lookup = procfs_lookup,
103 .vop_old_mkdir = (void *)procfs_badop,
104 .vop_old_mknod = (void *)procfs_badop,
105 .vop_open = procfs_open,
106 .vop_pathconf = vop_stdpathconf,
107 .vop_print = procfs_print,
108 .vop_read = procfs_rw,
109 .vop_readdir = procfs_readdir,
110 .vop_readlink = procfs_readlink,
111 .vop_reclaim = procfs_reclaim,
112 .vop_old_remove = (void *)procfs_badop,
113 .vop_old_rename = (void *)procfs_badop,
114 .vop_old_rmdir = (void *)procfs_badop,
115 .vop_setattr = procfs_setattr,
116 .vop_old_symlink = (void *)procfs_badop,
117 .vop_write = (void *)procfs_rw,
118 .vop_ioctl = procfs_ioctl
123 * This is a list of the valid names in the
124 * process-specific sub-directories. It is
125 * used in procfs_lookup and procfs_readdir
127 static struct proc_target {
132 int (*pt_valid) (struct lwp *p);
134 #define N(s) sizeof(s)-1, s
135 /* name type validp */
136 { DT_DIR, N("."), Pproc, NULL },
137 { DT_DIR, N(".."), Proot, NULL },
138 { DT_REG, N("mem"), Pmem, NULL },
139 { DT_REG, N("regs"), Pregs, procfs_validregs },
140 { DT_REG, N("fpregs"), Pfpregs, procfs_validfpregs },
141 { DT_REG, N("dbregs"), Pdbregs, procfs_validdbregs },
142 { DT_REG, N("ctl"), Pctl, NULL },
143 { DT_REG, N("status"), Pstatus, NULL },
144 { DT_REG, N("note"), Pnote, NULL },
145 { DT_REG, N("notepg"), Pnotepg, NULL },
146 { DT_REG, N("map"), Pmap, procfs_validmap },
147 { DT_REG, N("etype"), Ptype, procfs_validtype },
148 { DT_REG, N("cmdline"), Pcmdline, NULL },
149 { DT_REG, N("rlimit"), Prlimit, NULL },
150 { DT_LNK, N("file"), Pfile, NULL },
153 static const int nproc_targets = sizeof(proc_targets) / sizeof(proc_targets[0]);
155 static pid_t atopid (const char *, u_int);
158 * set things up for doing i/o on
159 * the pfsnode (vp). (vp) is locked
160 * on entry, and should be left locked
163 * for procfs we don't need to do anything
164 * in particular for i/o. all that is done
165 * is to support exclusive open on process
168 * procfs_open(struct vnode *a_vp, int a_mode, struct ucred *a_cred,
172 procfs_open(struct vop_open_args *ap)
174 struct pfsnode *pfs = VTOPFS(ap->a_vp);
175 struct proc *p1, *p2;
177 p2 = PFIND(pfs->pfs_pid);
180 if (pfs->pfs_pid && !PRISON_CHECK(ap->a_cred, p2->p_ucred))
183 switch (pfs->pfs_type) {
185 if (((pfs->pfs_flags & FWRITE) && (ap->a_mode & O_EXCL)) ||
186 ((pfs->pfs_flags & O_EXCL) && (ap->a_mode & FWRITE)))
191 /* Can't trace a process that's currently exec'ing. */
192 if ((p2->p_flag & P_INEXEC) != 0)
194 if (!CHECKIO(p1, p2) || p_trespass(ap->a_cred, p2->p_ucred))
197 if (ap->a_mode & FWRITE)
198 pfs->pfs_flags = ap->a_mode & (FWRITE|O_EXCL);
206 return (vop_stdopen(ap));
210 * close the pfsnode (vp) after doing i/o.
211 * (vp) is not locked on entry or exit.
213 * nothing to do for procfs other than undo
214 * any exclusive open flag (see _open above).
216 * procfs_close(struct vnode *a_vp, int a_fflag, struct ucred *a_cred)
219 procfs_close(struct vop_close_args *ap)
221 struct pfsnode *pfs = VTOPFS(ap->a_vp);
224 switch (pfs->pfs_type) {
226 if ((ap->a_fflag & FWRITE) && (pfs->pfs_flags & O_EXCL))
227 pfs->pfs_flags &= ~(FWRITE|O_EXCL);
229 * v_opencount determines the last real close on the vnode.
231 * If this is the last close, then it checks to see if
232 * the target process has PF_LINGER set in p_pfsflags,
233 * if this is *not* the case, then the process' stop flags
234 * are cleared, and the process is woken up. This is
235 * to help prevent the case where a process has been
236 * told to stop on an event, but then the requesting process
237 * has gone away or forgotten about it.
239 if ((ap->a_vp->v_opencount < 2)
240 && (p = pfind(pfs->pfs_pid))
241 && !(p->p_pfsflags & PF_LINGER)) {
242 spin_lock(&p->p_spin);
245 spin_unlock(&p->p_spin);
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 = priv_check_cred(ap->a_cred, PRIV_ROOT, 0)))
300 procp->p_pfsflags = flags;
303 *(unsigned int*)ap->a_data = (unsigned int)procp->p_pfsflags;
307 * NOTE: syscall entry deals with stopevents and may run without
310 psp = (struct procfs_status *)ap->a_data;
311 psp->flags = procp->p_pfsflags;
312 psp->events = procp->p_stops;
313 spin_lock(&procp->p_spin);
316 psp->why = procp->p_stype;
317 psp->val = procp->p_xstat;
318 spin_unlock(&procp->p_spin);
321 spin_unlock(&procp->p_spin);
322 psp->why = 0; /* Not defined values */
323 psp->val = 0; /* Not defined values */
328 * NOTE: syscall entry deals with stopevents and may run without
331 psp = (struct procfs_status *)ap->a_data;
332 spin_lock(&procp->p_spin);
333 while (procp->p_step == 0) {
334 tsleep_interlock(&procp->p_stype, PCATCH);
335 spin_unlock(&procp->p_spin);
336 error = tsleep(&procp->p_stype, PCATCH | PINTERLOCKED, "piocwait", 0);
339 spin_lock(&procp->p_spin);
341 spin_unlock(&procp->p_spin);
342 psp->state = 1; /* It stopped */
343 psp->flags = procp->p_pfsflags;
344 psp->events = procp->p_stops;
345 psp->why = procp->p_stype; /* why it stopped */
346 psp->val = procp->p_xstat; /* any extra info */
348 case PIOCCONT: /* Restart a proc */
350 * NOTE: syscall entry deals with stopevents and may run without
351 * the MP lock. However, the caller is presumably interlocked
354 if (procp->p_step == 0)
355 return EINVAL; /* Can only start a stopped process */
356 if ((signo = *(int*)ap->a_data) != 0) {
357 if (signo >= NSIG || signo <= 0)
359 ksignal(procp, signo);
362 wakeup(&procp->p_step);
371 * do block mapping for pfsnode (vp).
372 * since we don't use the buffer cache
373 * for procfs this function should never
374 * be called. in any case, it's not clear
375 * what part of the kernel ever makes use
376 * of this function. for sanity, this is the
377 * usual no-op bmap, although returning
378 * (EIO) would be a reasonable alternative.
380 * XXX mmap assumes buffer cache operation
382 * procfs_bmap(struct vnode *a_vp, off_t a_loffset,
383 * off_t *a_doffsetp, int *a_runp, int *a_runb)
386 procfs_bmap(struct vop_bmap_args *ap)
388 if (ap->a_doffsetp != NULL)
389 *ap->a_doffsetp = ap->a_loffset;
390 if (ap->a_runp != NULL)
392 if (ap->a_runb != NULL)
398 * procfs_inactive is called when the pfsnode
399 * is vrele'd and the reference count goes
400 * to zero. (vp) will be on the vnode free
401 * list, so to get it back vget() must be
404 * (vp) is locked on entry, but must be unlocked on exit.
406 * procfs_inactive(struct vnode *a_vp)
409 procfs_inactive(struct vop_inactive_args *ap)
411 struct pfsnode *pfs = VTOPFS(ap->a_vp);
413 if (pfs->pfs_pid & PFS_DEAD)
419 * _reclaim is called when getnewvnode()
420 * wants to make use of an entry on the vnode
421 * free list. at this time the filesystem needs
422 * to free any private data and remove the node
423 * from any private lists.
425 * procfs_reclaim(struct vnode *a_vp)
428 procfs_reclaim(struct vop_reclaim_args *ap)
430 return (procfs_freevp(ap->a_vp));
434 * _print is used for debugging.
435 * just print a readable description
438 * procfs_print(struct vnode *a_vp)
441 procfs_print(struct vop_print_args *ap)
443 struct pfsnode *pfs = VTOPFS(ap->a_vp);
445 kprintf("tag VT_PROCFS, type %d, pid %ld, mode %x, flags %lx\n",
446 pfs->pfs_type, (long)pfs->pfs_pid, pfs->pfs_mode, pfs->pfs_flags);
451 * generic entry point for unsupported operations
454 procfs_badop(struct vop_generic_args *ap)
460 * Invent attributes for pfsnode (vp) and store
462 * Directories lengths are returned as zero since
463 * any real length would require the genuine size
464 * to be computed, and nothing cares anyway.
466 * this is relatively minimal for procfs.
468 * procfs_getattr(struct vnode *a_vp, struct vattr *a_vap)
471 procfs_getattr(struct vop_getattr_args *ap)
473 struct pfsnode *pfs = VTOPFS(ap->a_vp);
474 struct vattr *vap = ap->a_vap;
479 * First make sure that the process and its credentials
482 switch (pfs->pfs_type) {
489 procp = PFIND(pfs->pfs_pid);
490 if (procp == NULL || procp->p_ucred == NULL)
496 /* start by zeroing out the attributes */
499 /* next do all the common fields */
500 vap->va_type = ap->a_vp->v_type;
501 vap->va_mode = pfs->pfs_mode;
502 vap->va_fileid = pfs->pfs_fileno;
504 vap->va_blocksize = PAGE_SIZE;
505 vap->va_bytes = vap->va_size = 0;
506 vap->va_fsid = ap->a_vp->v_mount->mnt_stat.f_fsid.val[0];
509 * Make all times be current TOD.
510 * It would be possible to get the process start
511 * time from the p_stat structure, but there's
512 * no "file creation" time stamp anyway, and the
513 * p_stat structure is not addressible if u. gets
514 * swapped out for that process.
516 nanotime(&vap->va_ctime);
517 vap->va_atime = vap->va_mtime = vap->va_ctime;
520 * If the process has exercised some setuid or setgid
521 * privilege, then rip away read/write permission so
522 * that only root can gain access.
524 switch (pfs->pfs_type) {
530 if (procp->p_flag & P_SUGID)
531 vap->va_mode &= ~((VREAD|VWRITE)|
533 ((VREAD|VWRITE)>>6));
540 * now do the object specific fields
542 * The size could be set from struct reg, but it's hardly
543 * worth the trouble, and it puts some (potentially) machine
544 * dependent data into this machine-independent code. If it
545 * becomes important then this function should break out into
546 * a per-file stat function in the corresponding .c file.
551 vap->va_uid = procp->p_ucred->cr_uid;
552 vap->va_gid = procp->p_ucred->cr_gid;
555 switch (pfs->pfs_type) {
558 * Set nlink to 1 to tell fts(3) we don't actually know.
563 vap->va_size = vap->va_bytes = DEV_BSIZE;
567 char buf[16]; /* should be enough */
570 vap->va_size = vap->va_bytes =
571 ksnprintf(buf, sizeof(buf), "%ld", (long)curproc->p_pid);
576 vap->va_nlink = nproc_targets;
577 vap->va_size = vap->va_bytes = DEV_BSIZE;
581 char *fullpath, *freepath;
582 error = cache_fullpath(procp, &procp->p_textnch, &fullpath, &freepath, 0);
584 vap->va_size = strlen(fullpath);
585 kfree(freepath, M_TEMP);
587 vap->va_size = sizeof("unknown") - 1;
590 vap->va_bytes = vap->va_size;
596 * If we denied owner access earlier, then we have to
597 * change the owner to root - otherwise 'ps' and friends
598 * will break even though they are setgid kmem. *SIGH*
600 if (procp->p_flag & P_SUGID)
603 vap->va_uid = procp->p_ucred->cr_uid;
607 vap->va_bytes = vap->va_size = sizeof(struct reg);
611 vap->va_bytes = vap->va_size = sizeof(struct fpreg);
615 vap->va_bytes = vap->va_size = sizeof(struct dbreg);
629 panic("procfs_getattr");
636 * procfs_setattr(struct vnode *a_vp, struct vattr *a_vap,
637 * struct ucred *a_cred)
640 procfs_setattr(struct vop_setattr_args *ap)
642 if (ap->a_vap->va_flags != VNOVAL)
646 * just fake out attribute setting
647 * it's not good to generate an error
648 * return, otherwise things like creat()
649 * will fail when they try to set the
650 * file length to 0. worse, this means
651 * that echo $note > /proc/$pid/note will fail.
658 * implement access checking.
660 * procfs_access(struct vnode *a_vp, int a_mode, struct ucred *a_cred)
663 procfs_access(struct vop_access_args *ap)
668 error = VOP_GETATTR(ap->a_vp, &vattr);
670 error = vop_helper_access(ap, vattr.va_uid, vattr.va_gid,
676 * lookup. this is incredibly complicated in the general case, however
677 * for most pseudo-filesystems very little needs to be done.
679 * procfs_lookup(struct vnode *a_dvp, struct vnode **a_vpp,
680 * struct componentname *a_cnp)
683 procfs_lookup(struct vop_old_lookup_args *ap)
685 struct componentname *cnp = ap->a_cnp;
686 struct vnode **vpp = ap->a_vpp;
687 struct vnode *dvp = ap->a_dvp;
688 char *pname = cnp->cn_nameptr;
689 /* struct proc *curp = cnp->cn_proc; */
690 struct proc_target *pt;
700 if (cnp->cn_nameiop == NAMEI_DELETE || cnp->cn_nameiop == NAMEI_RENAME)
704 if (cnp->cn_namelen == 1 && *pname == '.') {
711 switch (pfs->pfs_type) {
713 if (cnp->cn_flags & CNP_ISDOTDOT)
716 if (CNEQ(cnp, "curproc", 7)) {
717 error = procfs_allocvp(dvp->v_mount, vpp, 0, Pcurproc);
721 pid = atopid(pname, cnp->cn_namelen);
729 if (!PRISON_CHECK(ap->a_cnp->cn_cred, p->p_ucred))
732 if (ps_showallprocs == 0 && ap->a_cnp->cn_cred->cr_uid != 0 &&
733 ap->a_cnp->cn_cred->cr_uid != p->p_ucred->cr_uid)
736 error = procfs_allocvp(dvp->v_mount, vpp, pid, Pproc);
740 if (cnp->cn_flags & CNP_ISDOTDOT) {
741 error = procfs_root(dvp->v_mount, vpp);
745 p = PFIND(pfs->pfs_pid);
749 lp = FIRST_LWP_IN_PROC(p);
751 if (!PRISON_CHECK(ap->a_cnp->cn_cred, p->p_ucred))
754 if (ps_showallprocs == 0 && ap->a_cnp->cn_cred->cr_uid != 0 &&
755 ap->a_cnp->cn_cred->cr_uid != p->p_ucred->cr_uid)
758 for (pt = proc_targets, i = 0; i < nproc_targets; pt++, i++) {
759 if (cnp->cn_namelen == pt->pt_namlen &&
760 bcmp(pt->pt_name, pname, cnp->cn_namelen) == 0 &&
761 (pt->pt_valid == NULL || (*pt->pt_valid)(lp)))
766 error = procfs_allocvp(dvp->v_mount, vpp, pfs->pfs_pid,
774 if (cnp->cn_nameiop == NAMEI_LOOKUP)
779 * If no error occured *vpp will hold a referenced locked vnode.
780 * dvp was passed to us locked and *vpp must be returned locked.
781 * If *vpp != dvp then we should unlock dvp if (1) this is not the
782 * last component or (2) CNP_LOCKPARENT is not set.
785 if (error == 0 && *vpp != dvp) {
786 if ((cnp->cn_flags & CNP_LOCKPARENT) == 0) {
787 cnp->cn_flags |= CNP_PDIRUNLOCK;
795 * Does this process have a text file?
798 procfs_validfile(struct lwp *lp)
800 return (procfs_findtextvp(lp->lwp_proc) != NULLVP);
804 * readdir() returns directory entries from pfsnode (vp).
806 * We generate just one directory entry at a time, as it would probably
807 * not pay off to buffer several entries locally to save uiomove calls.
809 * procfs_readdir(struct vnode *a_vp, struct uio *a_uio, struct ucred *a_cred,
810 * int *a_eofflag, int *a_ncookies, off_t **a_cookies)
813 procfs_readdir(struct vop_readdir_args *ap)
818 if (ap->a_uio->uio_offset < 0 || ap->a_uio->uio_offset > INT_MAX)
820 if ((error = vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY)) != 0)
822 pfs = VTOPFS(ap->a_vp);
824 switch (pfs->pfs_type) {
827 * this is for the process-specific sub-directories.
828 * all that is needed to is copy out all the entries
829 * from the procent[] table (top of this file).
831 error = procfs_readdir_proc(ap);
835 * this is for the root of the procfs filesystem
836 * what is needed is a special entry for "curproc"
837 * followed by an entry for each process on allproc
839 error = procfs_readdir_root(ap);
851 procfs_readdir_proc(struct vop_readdir_args *ap)
854 int error, i, retval;
857 struct proc_target *pt;
858 struct uio *uio = ap->a_uio;
860 pfs = VTOPFS(ap->a_vp);
861 p = PFIND(pfs->pfs_pid);
864 if (!PRISON_CHECK(ap->a_cred, p->p_ucred))
867 lp = FIRST_LWP_IN_PROC(p);
870 i = (int)uio->uio_offset;
874 for (pt = &proc_targets[i];
875 !error && uio->uio_resid > 0 && i < nproc_targets; pt++, i++) {
876 if (pt->pt_valid && (*pt->pt_valid)(lp) == 0)
879 retval = vop_write_dirent(&error, uio,
880 PROCFS_FILENO(pfs->pfs_pid, pt->pt_pfstype), pt->pt_type,
881 pt->pt_namlen, pt->pt_name);
886 uio->uio_offset = (off_t)i;
891 struct procfs_readdir_root_info {
899 static int procfs_readdir_root_callback(struct proc *p, void *data);
902 procfs_readdir_root(struct vop_readdir_args *ap)
904 struct procfs_readdir_root_info info;
905 struct uio *uio = ap->a_uio;
909 info.i = (int)uio->uio_offset;
916 info.cred = ap->a_cred;
917 while (info.pcnt < 3) {
918 res = procfs_readdir_root_callback(NULL, &info);
923 allproc_scan(procfs_readdir_root_callback, &info);
924 uio->uio_offset = (off_t)info.i;
930 procfs_readdir_root_callback(struct proc *p, void *data)
932 struct procfs_readdir_root_info *info = data;
943 if (uio->uio_resid <= 0 || info->error)
946 switch (info->pcnt) {
948 d_ino = PROCFS_FILENO(0, Proot);
954 d_ino = PROCFS_FILENO(0, Proot);
961 d_ino = PROCFS_FILENO(0, Pcurproc);
969 if (!PRISON_CHECK(info->cred, p->p_ucred))
971 if (ps_showallprocs == 0 &&
972 info->cred->cr_uid != 0 &&
973 info->cred->cr_uid != p->p_ucred->cr_uid) {
978 * Skip entries we have already returned (optimization)
980 if (info->pcnt < info->i) {
985 d_ino = PROCFS_FILENO(p->p_pid, Pproc);
986 d_namlen = ksnprintf(d_name_pid, sizeof(d_name_pid),
987 "%ld", (long)p->p_pid);
994 * Skip entries we have already returned (optimization)
996 if (info->pcnt < info->i) {
1001 retval = vop_write_dirent(&info->error, uio,
1002 d_ino, d_type, d_namlen, d_name);
1011 * readlink reads the link of `curproc' or `file'
1014 procfs_readlink(struct vop_readlink_args *ap)
1016 char buf[16]; /* should be enough */
1018 struct vnode *vp = ap->a_vp;
1019 struct pfsnode *pfs = VTOPFS(vp);
1020 char *fullpath, *freepath;
1023 switch (pfs->pfs_type) {
1025 if (pfs->pfs_fileno != PROCFS_FILENO(0, Pcurproc))
1028 len = ksnprintf(buf, sizeof(buf), "%ld", (long)curproc->p_pid);
1030 return (uiomove(buf, len, ap->a_uio));
1032 * There _should_ be no way for an entire process to disappear
1036 procp = PFIND(pfs->pfs_pid);
1037 if (procp == NULL || procp->p_ucred == NULL) {
1038 kprintf("procfs_readlink: pid %d disappeared\n",
1040 return (uiomove("unknown", sizeof("unknown") - 1,
1043 error = cache_fullpath(procp, &procp->p_textnch, &fullpath, &freepath, 0);
1045 return (uiomove("unknown", sizeof("unknown") - 1,
1047 error = uiomove(fullpath, strlen(fullpath), ap->a_uio);
1048 kfree(freepath, M_TEMP);
1056 * convert decimal ascii to pid_t
1059 atopid(const char *b, u_int len)
1065 if (c < '0' || c > '9')
1067 p = 10 * p + (c - '0');