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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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
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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 $
43 * procfs vnode interface
46 #include <sys/param.h>
47 #include <sys/systm.h>
49 #include <sys/kernel.h>
51 #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 <sys/spinlock2.h>
68 #include <machine/limits.h>
70 static int procfs_access (struct vop_access_args *);
71 static int procfs_badop (struct vop_generic_args *);
72 static int procfs_bmap (struct vop_bmap_args *);
73 static int procfs_close (struct vop_close_args *);
74 static int procfs_getattr (struct vop_getattr_args *);
75 static int procfs_inactive (struct vop_inactive_args *);
76 static int procfs_ioctl (struct vop_ioctl_args *);
77 static int procfs_lookup (struct vop_old_lookup_args *);
78 static int procfs_open (struct vop_open_args *);
79 static int procfs_print (struct vop_print_args *);
80 static int procfs_readdir (struct vop_readdir_args *);
81 static int procfs_readlink (struct vop_readlink_args *);
82 static int procfs_reclaim (struct vop_reclaim_args *);
83 static int procfs_setattr (struct vop_setattr_args *);
85 static int procfs_readdir_proc(struct vop_readdir_args *);
86 static int procfs_readdir_root(struct vop_readdir_args *);
89 * procfs vnode operations.
91 struct vop_ops procfs_vnode_vops = {
92 .vop_default = vop_defaultop,
93 .vop_access = procfs_access,
94 .vop_advlock = (void *)procfs_badop,
95 .vop_bmap = procfs_bmap,
96 .vop_close = procfs_close,
97 .vop_old_create = (void *)procfs_badop,
98 .vop_getattr = procfs_getattr,
99 .vop_inactive = procfs_inactive,
100 .vop_old_link = (void *)procfs_badop,
101 .vop_old_lookup = procfs_lookup,
102 .vop_old_mkdir = (void *)procfs_badop,
103 .vop_old_mknod = (void *)procfs_badop,
104 .vop_open = procfs_open,
105 .vop_pathconf = vop_stdpathconf,
106 .vop_print = procfs_print,
107 .vop_read = procfs_rw,
108 .vop_readdir = procfs_readdir,
109 .vop_readlink = procfs_readlink,
110 .vop_reclaim = procfs_reclaim,
111 .vop_old_remove = (void *)procfs_badop,
112 .vop_old_rename = (void *)procfs_badop,
113 .vop_old_rmdir = (void *)procfs_badop,
114 .vop_setattr = procfs_setattr,
115 .vop_old_symlink = (void *)procfs_badop,
116 .vop_write = (void *)procfs_rw,
117 .vop_ioctl = procfs_ioctl
122 * This is a list of the valid names in the
123 * process-specific sub-directories. It is
124 * used in procfs_lookup and procfs_readdir
126 static struct proc_target {
131 int (*pt_valid) (struct lwp *p);
133 #define N(s) sizeof(s)-1, s
134 /* name type validp */
135 { DT_DIR, N("."), Pproc, NULL },
136 { DT_DIR, N(".."), Proot, NULL },
137 { DT_REG, N("mem"), Pmem, NULL },
138 { DT_REG, N("regs"), Pregs, procfs_validregs },
139 { DT_REG, N("fpregs"), Pfpregs, procfs_validfpregs },
140 { DT_REG, N("dbregs"), Pdbregs, procfs_validdbregs },
141 { DT_REG, N("ctl"), Pctl, NULL },
142 { DT_REG, N("status"), Pstatus, NULL },
143 { DT_REG, N("note"), Pnote, NULL },
144 { DT_REG, N("notepg"), Pnotepg, NULL },
145 { DT_REG, N("map"), Pmap, procfs_validmap },
146 { DT_REG, N("etype"), Ptype, procfs_validtype },
147 { DT_REG, N("cmdline"), Pcmdline, NULL },
148 { DT_REG, N("rlimit"), Prlimit, NULL },
149 { DT_LNK, N("file"), Pfile, NULL },
152 static const int nproc_targets = NELEM(proc_targets);
154 static pid_t atopid (const char *, u_int);
157 * set things up for doing i/o on
158 * the pfsnode (vp). (vp) is locked
159 * on entry, and should be left locked
162 * for procfs we don't need to do anything
163 * in particular for i/o. all that is done
164 * is to support exclusive open on process
167 * procfs_open(struct vnode *a_vp, int a_mode, struct ucred *a_cred,
171 procfs_open(struct vop_open_args *ap)
173 struct pfsnode *pfs = VTOPFS(ap->a_vp);
174 struct proc *p1, *p2;
177 p2 = pfs_pfind(pfs->pfs_pid);
180 if (pfs->pfs_pid && !PRISON_CHECK(ap->a_cred, p2->p_ucred)) {
185 switch (pfs->pfs_type) {
187 if (((pfs->pfs_flags & FWRITE) && (ap->a_mode & O_EXCL)) ||
188 ((pfs->pfs_flags & O_EXCL) && (ap->a_mode & FWRITE))) {
195 /* Can't trace a process that's currently exec'ing. */
196 if ((p2->p_flags & P_INEXEC) != 0) {
200 if (!CHECKIO(p1, p2) || p_trespass(ap->a_cred, p2->p_ucred)) {
205 if (ap->a_mode & FWRITE)
206 pfs->pfs_flags = ap->a_mode & (FWRITE|O_EXCL);
213 error = vop_stdopen(ap);
220 * close the pfsnode (vp) after doing i/o.
221 * (vp) is not locked on entry or exit.
223 * nothing to do for procfs other than undo
224 * any exclusive open flag (see _open above).
226 * procfs_close(struct vnode *a_vp, int a_fflag, struct ucred *a_cred)
229 procfs_close(struct vop_close_args *ap)
231 struct pfsnode *pfs = VTOPFS(ap->a_vp);
234 switch (pfs->pfs_type) {
236 if ((ap->a_fflag & FWRITE) && (pfs->pfs_flags & O_EXCL))
237 pfs->pfs_flags &= ~(FWRITE|O_EXCL);
239 * v_opencount determines the last real close on the vnode.
241 * If this is the last close, then it checks to see if
242 * the target process has PF_LINGER set in p_pfsflags,
243 * if this is *not* the case, then the process' stop flags
244 * are cleared, and the process is woken up. This is
245 * to help prevent the case where a process has been
246 * told to stop on an event, but then the requesting process
247 * has gone away or forgotten about it.
250 if ((ap->a_vp->v_opencount < 2)
251 && ((p = pfs_pfind(pfs->pfs_pid)) != NULL ||
252 (p = pfs_zpfind(pfs->pfs_pid)) != NULL)
253 && !(p->p_pfsflags & PF_LINGER)) {
254 spin_lock(&p->p_spin);
257 spin_unlock(&p->p_spin);
267 return (vop_stdclose(ap));
271 * do an ioctl operation on a pfsnode (vp).
272 * (vp) is not locked on entry or exit.
275 procfs_ioctl(struct vop_ioctl_args *ap)
277 struct pfsnode *pfs = VTOPFS(ap->a_vp);
282 struct procfs_status *psp;
285 procp = pfs_pfind(pfs->pfs_pid);
294 /* Can't trace a process that's currently exec'ing. */
295 if ((procp->p_flags & P_INEXEC) != 0) {
299 if (!CHECKIO(p, procp) || p_trespass(ap->a_cred, procp->p_ucred)) {
304 switch (ap->a_command) {
306 spin_lock(&procp->p_spin);
307 procp->p_stops |= *(unsigned int*)ap->a_data;
308 spin_unlock(&procp->p_spin);
311 spin_lock(&procp->p_spin);
312 procp->p_stops &= ~*(unsigned int*)ap->a_data;
313 spin_unlock(&procp->p_spin);
317 * NFLAGS is "non-suser_xxx flags" -- currently, only
318 * PFS_ISUGID ("ignore set u/g id");
320 #define NFLAGS (PF_ISUGID)
321 flags = (unsigned char)*(unsigned int*)ap->a_data;
322 if (flags & NFLAGS && (error = priv_check_cred(ap->a_cred, PRIV_ROOT, 0)))
324 procp->p_pfsflags = flags;
327 *(unsigned int*)ap->a_data = (unsigned int)procp->p_pfsflags;
331 * NOTE: syscall entry deals with stopevents and may run without
334 psp = (struct procfs_status *)ap->a_data;
335 psp->flags = procp->p_pfsflags;
336 psp->events = procp->p_stops;
337 spin_lock(&procp->p_spin);
340 psp->why = procp->p_stype;
341 psp->val = procp->p_xstat;
342 spin_unlock(&procp->p_spin);
345 spin_unlock(&procp->p_spin);
346 psp->why = 0; /* Not defined values */
347 psp->val = 0; /* Not defined values */
352 * NOTE: syscall entry deals with stopevents and may run without
355 psp = (struct procfs_status *)ap->a_data;
356 spin_lock(&procp->p_spin);
357 while (procp->p_step == 0) {
358 tsleep_interlock(&procp->p_stype, PCATCH);
359 spin_unlock(&procp->p_spin);
360 if (procp->p_stops == 0) {
364 if (procp->p_flags & P_POSTEXIT) {
368 if (procp->p_flags & P_INEXEC) {
372 error = tsleep(&procp->p_stype, PCATCH | PINTERLOCKED,
376 spin_lock(&procp->p_spin);
378 spin_unlock(&procp->p_spin);
379 psp->state = 1; /* It stopped */
380 psp->flags = procp->p_pfsflags;
381 psp->events = procp->p_stops;
382 psp->why = procp->p_stype; /* why it stopped */
383 psp->val = procp->p_xstat; /* any extra info */
385 case PIOCCONT: /* Restart a proc */
387 * NOTE: syscall entry deals with stopevents and may run without
388 * the MP lock. However, the caller is presumably interlocked
391 if (procp->p_step == 0) {
392 error = EINVAL; /* Can only start a stopped process */
395 if ((signo = *(int*)ap->a_data) != 0) {
396 if (signo >= NSIG || signo <= 0) {
400 ksignal(procp, signo);
403 wakeup(&procp->p_step);
416 * do block mapping for pfsnode (vp).
417 * since we don't use the buffer cache
418 * for procfs this function should never
419 * be called. in any case, it's not clear
420 * what part of the kernel ever makes use
421 * of this function. for sanity, this is the
422 * usual no-op bmap, although returning
423 * (EIO) would be a reasonable alternative.
425 * XXX mmap assumes buffer cache operation
427 * procfs_bmap(struct vnode *a_vp, off_t a_loffset,
428 * off_t *a_doffsetp, int *a_runp, int *a_runb)
431 procfs_bmap(struct vop_bmap_args *ap)
433 if (ap->a_doffsetp != NULL)
434 *ap->a_doffsetp = ap->a_loffset;
435 if (ap->a_runp != NULL)
437 if (ap->a_runb != NULL)
443 * procfs_inactive is called when the pfsnode
444 * is vrele'd and the reference count goes
445 * to zero. (vp) will be on the vnode free
446 * list, so to get it back vget() must be
449 * (vp) is locked on entry, but must be unlocked on exit.
451 * procfs_inactive(struct vnode *a_vp)
454 procfs_inactive(struct vop_inactive_args *ap)
456 struct pfsnode *pfs = VTOPFS(ap->a_vp);
458 if (pfs->pfs_pid & PFS_DEAD)
464 * _reclaim is called when getnewvnode()
465 * wants to make use of an entry on the vnode
466 * free list. at this time the filesystem needs
467 * to free any private data and remove the node
468 * from any private lists.
470 * procfs_reclaim(struct vnode *a_vp)
473 procfs_reclaim(struct vop_reclaim_args *ap)
475 return (procfs_freevp(ap->a_vp));
479 * _print is used for debugging.
480 * just print a readable description
483 * procfs_print(struct vnode *a_vp)
486 procfs_print(struct vop_print_args *ap)
488 struct pfsnode *pfs = VTOPFS(ap->a_vp);
490 kprintf("tag VT_PROCFS, type %d, pid %ld, mode %x, flags %lx\n",
491 pfs->pfs_type, (long)pfs->pfs_pid, pfs->pfs_mode, pfs->pfs_flags);
496 * generic entry point for unsupported operations
499 procfs_badop(struct vop_generic_args *ap)
505 * Invent attributes for pfsnode (vp) and store
507 * Directories lengths are returned as zero since
508 * any real length would require the genuine size
509 * to be computed, and nothing cares anyway.
511 * this is relatively minimal for procfs.
513 * procfs_getattr(struct vnode *a_vp, struct vattr *a_vap)
516 procfs_getattr(struct vop_getattr_args *ap)
518 struct pfsnode *pfs = VTOPFS(ap->a_vp);
519 struct vattr *vap = ap->a_vap;
524 * First make sure that the process and its credentials
527 switch (pfs->pfs_type) {
533 procp = pfs_pfind(pfs->pfs_pid);
534 if (procp == NULL || procp->p_ucred == NULL) {
543 /* start by zeroing out the attributes */
546 /* next do all the common fields */
547 vap->va_type = ap->a_vp->v_type;
548 vap->va_mode = pfs->pfs_mode;
549 vap->va_fileid = pfs->pfs_fileno;
551 vap->va_blocksize = PAGE_SIZE;
552 vap->va_bytes = vap->va_size = 0;
553 vap->va_fsid = ap->a_vp->v_mount->mnt_stat.f_fsid.val[0];
556 * Make all times be current TOD.
557 * It would be possible to get the process start
558 * time from the p_stat structure, but there's
559 * no "file creation" time stamp anyway, and the
560 * p_stat structure is not addressible if u. gets
561 * swapped out for that process.
563 nanotime(&vap->va_ctime);
564 vap->va_atime = vap->va_mtime = vap->va_ctime;
567 * If the process has exercised some setuid or setgid
568 * privilege, then rip away read/write permission so
569 * that only root can gain access.
571 switch (pfs->pfs_type) {
577 if (procp->p_flags & P_SUGID) {
578 vap->va_mode &= ~((VREAD|VWRITE)|
580 ((VREAD|VWRITE)>>6));
588 * now do the object specific fields
590 * The size could be set from struct reg, but it's hardly
591 * worth the trouble, and it puts some (potentially) machine
592 * dependent data into this machine-independent code. If it
593 * becomes important then this function should break out into
594 * a per-file stat function in the corresponding .c file.
599 if (procp->p_ucred) {
600 vap->va_uid = procp->p_ucred->cr_uid;
601 vap->va_gid = procp->p_ucred->cr_gid;
608 switch (pfs->pfs_type) {
611 * Set nlink to 1 to tell fts(3) we don't actually know.
616 vap->va_size = vap->va_bytes = DEV_BSIZE;
620 char buf[16]; /* should be enough */
624 vap->va_size = ksnprintf(buf, sizeof(buf),
625 "%ld", (long)curproc->p_pid);
626 vap->va_bytes = vap->va_size;
631 vap->va_nlink = nproc_targets;
632 vap->va_size = vap->va_bytes = DEV_BSIZE;
636 char *fullpath, *freepath;
638 if (procp->p_textnch.ncp) {
641 cache_copy(&procp->p_textnch, &nch);
642 error = cache_fullpath(procp, &nch, NULL,
643 &fullpath, &freepath, 0);
650 vap->va_size = strlen(fullpath);
651 kfree(freepath, M_TEMP);
653 vap->va_size = sizeof("unknown") - 1;
656 vap->va_bytes = vap->va_size;
662 * If we denied owner access earlier, then we have to
663 * change the owner to root - otherwise 'ps' and friends
664 * will break even though they are setgid kmem. *SIGH*
666 if (procp->p_flags & P_SUGID)
668 else if (procp->p_ucred)
669 vap->va_uid = procp->p_ucred->cr_uid;
675 vap->va_bytes = vap->va_size = sizeof(struct reg);
679 vap->va_bytes = vap->va_size = sizeof(struct fpreg);
683 vap->va_bytes = vap->va_size = sizeof(struct dbreg);
697 panic("procfs_getattr");
705 * procfs_setattr(struct vnode *a_vp, struct vattr *a_vap,
706 * struct ucred *a_cred)
709 procfs_setattr(struct vop_setattr_args *ap)
711 if (ap->a_vap->va_flags != VNOVAL)
715 * just fake out attribute setting
716 * it's not good to generate an error
717 * return, otherwise things like creat()
718 * will fail when they try to set the
719 * file length to 0. worse, this means
720 * that echo $note > /proc/$pid/note will fail.
727 * implement access checking.
729 * procfs_access(struct vnode *a_vp, int a_mode, struct ucred *a_cred)
732 procfs_access(struct vop_access_args *ap)
737 error = VOP_GETATTR(ap->a_vp, &vattr);
739 error = vop_helper_access(ap, vattr.va_uid, vattr.va_gid,
745 * lookup. this is incredibly complicated in the general case, however
746 * for most pseudo-filesystems very little needs to be done.
748 * procfs_lookup(struct vnode *a_dvp, struct vnode **a_vpp,
749 * struct componentname *a_cnp)
752 procfs_lookup(struct vop_old_lookup_args *ap)
754 struct componentname *cnp = ap->a_cnp;
755 struct vnode **vpp = ap->a_vpp;
756 struct vnode *dvp = ap->a_dvp;
757 char *pname = cnp->cn_nameptr;
758 /* struct proc *curp = cnp->cn_proc; */
759 struct proc_target *pt;
769 if (cnp->cn_nameiop == NAMEI_DELETE || cnp->cn_nameiop == NAMEI_RENAME)
774 if (cnp->cn_namelen == 1 && *pname == '.') {
781 switch (pfs->pfs_type) {
783 if (cnp->cn_flags & CNP_ISDOTDOT)
786 if (CNEQ(cnp, "curproc", 7)) {
787 error = procfs_allocvp(dvp->v_mount, vpp, 0, Pcurproc);
791 pid = atopid(pname, cnp->cn_namelen);
799 if (!PRISON_CHECK(ap->a_cnp->cn_cred, p->p_ucred))
802 if (ps_showallprocs == 0 && ap->a_cnp->cn_cred->cr_uid != 0 &&
803 ap->a_cnp->cn_cred->cr_uid != p->p_ucred->cr_uid)
806 error = procfs_allocvp(dvp->v_mount, vpp, pid, Pproc);
810 if (cnp->cn_flags & CNP_ISDOTDOT) {
811 error = procfs_root(dvp->v_mount, vpp);
815 p = pfs_pfind(pfs->pfs_pid);
819 lp = FIRST_LWP_IN_PROC(p);
821 if (!PRISON_CHECK(ap->a_cnp->cn_cred, p->p_ucred))
824 if (ps_showallprocs == 0 && ap->a_cnp->cn_cred->cr_uid != 0 &&
825 ap->a_cnp->cn_cred->cr_uid != p->p_ucred->cr_uid)
828 for (pt = proc_targets, i = 0; i < nproc_targets; pt++, i++) {
829 if (cnp->cn_namelen == pt->pt_namlen &&
830 bcmp(pt->pt_name, pname, cnp->cn_namelen) == 0 &&
831 (pt->pt_valid == NULL || (*pt->pt_valid)(lp)))
836 error = procfs_allocvp(dvp->v_mount, vpp, pfs->pfs_pid,
844 if (cnp->cn_nameiop == NAMEI_LOOKUP)
849 * If no error occured *vpp will hold a referenced locked vnode.
850 * dvp was passed to us locked and *vpp must be returned locked.
851 * If *vpp != dvp then we should unlock dvp if (1) this is not the
852 * last component or (2) CNP_LOCKPARENT is not set.
855 if (error == 0 && *vpp != dvp) {
856 if ((cnp->cn_flags & CNP_LOCKPARENT) == 0) {
857 cnp->cn_flags |= CNP_PDIRUNLOCK;
866 * Does this process have a text file?
869 procfs_validfile(struct lwp *lp)
871 return (procfs_findtextvp(lp->lwp_proc) != NULLVP);
875 * readdir() returns directory entries from pfsnode (vp).
877 * We generate just one directory entry at a time, as it would probably
878 * not pay off to buffer several entries locally to save uiomove calls.
880 * procfs_readdir(struct vnode *a_vp, struct uio *a_uio, struct ucred *a_cred,
881 * int *a_eofflag, int *a_ncookies, off_t **a_cookies)
884 procfs_readdir(struct vop_readdir_args *ap)
889 if (ap->a_uio->uio_offset < 0 || ap->a_uio->uio_offset > INT_MAX)
891 if ((error = vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY)) != 0)
893 pfs = VTOPFS(ap->a_vp);
895 switch (pfs->pfs_type) {
898 * this is for the process-specific sub-directories.
899 * all that is needed to is copy out all the entries
900 * from the procent[] table (top of this file).
902 error = procfs_readdir_proc(ap);
906 * this is for the root of the procfs filesystem
907 * what is needed is a special entry for "curproc"
908 * followed by an entry for each process on allproc
910 error = procfs_readdir_root(ap);
922 procfs_readdir_proc(struct vop_readdir_args *ap)
925 int error, i, retval;
928 struct proc_target *pt;
929 struct uio *uio = ap->a_uio;
931 pfs = VTOPFS(ap->a_vp);
932 p = pfs_pfind(pfs->pfs_pid);
935 if (!PRISON_CHECK(ap->a_cred, p->p_ucred)) {
939 /* XXX lwp, not MPSAFE */
940 lp = FIRST_LWP_IN_PROC(p);
943 i = (int)uio->uio_offset;
949 for (pt = &proc_targets[i];
950 !error && uio->uio_resid > 0 && i < nproc_targets; pt++, i++) {
951 if (pt->pt_valid && (*pt->pt_valid)(lp) == 0)
954 retval = vop_write_dirent(&error, uio,
955 PROCFS_FILENO(pfs->pfs_pid, pt->pt_pfstype), pt->pt_type,
956 pt->pt_namlen, pt->pt_name);
961 uio->uio_offset = (off_t)i;
968 struct procfs_readdir_root_info {
976 static int procfs_readdir_root_callback(struct proc *p, void *data);
979 procfs_readdir_root(struct vop_readdir_args *ap)
981 struct procfs_readdir_root_info info;
982 struct uio *uio = ap->a_uio;
987 info.i = (int)uio->uio_offset;
994 info.cred = ap->a_cred;
995 while (info.pcnt < 3) {
996 res = procfs_readdir_root_callback(NULL, &info);
1001 allproc_scan(procfs_readdir_root_callback, &info);
1002 uio->uio_offset = (off_t)info.i;
1004 return (info.error);
1008 procfs_readdir_root_callback(struct proc *p, void *data)
1010 struct procfs_readdir_root_info *info = data;
1015 char d_name_pid[20];
1021 if (uio->uio_resid <= 0 || info->error)
1024 switch (info->pcnt) {
1026 d_ino = PROCFS_FILENO(0, Proot);
1032 d_ino = PROCFS_FILENO(0, Proot);
1039 d_ino = PROCFS_FILENO(0, Pcurproc);
1047 if (!PRISON_CHECK(info->cred, p->p_ucred))
1049 if (ps_showallprocs == 0 &&
1050 info->cred->cr_uid != 0 &&
1051 info->cred->cr_uid != p->p_ucred->cr_uid) {
1056 * Skip entries we have already returned (optimization)
1058 if (info->pcnt < info->i) {
1063 d_ino = PROCFS_FILENO(p->p_pid, Pproc);
1064 d_namlen = ksnprintf(d_name_pid, sizeof(d_name_pid),
1065 "%ld", (long)p->p_pid);
1066 d_name = d_name_pid;
1072 * Skip entries we have already returned (optimization)
1074 if (info->pcnt < info->i) {
1079 retval = vop_write_dirent(&info->error, uio,
1080 d_ino, d_type, d_namlen, d_name);
1089 * readlink reads the link of `curproc' or `file'
1092 procfs_readlink(struct vop_readlink_args *ap)
1094 char buf[16]; /* should be enough */
1096 struct vnode *vp = ap->a_vp;
1097 struct pfsnode *pfs = VTOPFS(vp);
1098 char *fullpath, *freepath;
1101 switch (pfs->pfs_type) {
1103 if (pfs->pfs_fileno != PROCFS_FILENO(0, Pcurproc))
1106 len = ksnprintf(buf, sizeof(buf), "%ld", (long)curproc->p_pid);
1108 return (uiomove(buf, len, ap->a_uio));
1110 * There _should_ be no way for an entire process to disappear
1114 procp = pfs_pfind(pfs->pfs_pid);
1115 if (procp == NULL || procp->p_ucred == NULL) {
1116 kprintf("procfs_readlink: pid %d disappeared\n",
1119 return (uiomove("unknown", sizeof("unknown") - 1,
1122 if (procp->p_textnch.ncp) {
1123 struct nchandle nch;
1125 cache_copy(&procp->p_textnch, &nch);
1126 error = cache_fullpath(procp, &nch, NULL,
1127 &fullpath, &freepath, 0);
1135 return (uiomove("unknown", sizeof("unknown") - 1,
1138 error = uiomove(fullpath, strlen(fullpath), ap->a_uio);
1139 kfree(freepath, M_TEMP);
1148 * convert decimal ascii to pid_t
1151 atopid(const char *b, u_int len)
1157 if (c < '0' || c > '9')
1159 p = 10 * p + (c - '0');