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 $
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))
252 && !(p->p_pfsflags & PF_LINGER)) {
253 spin_lock(&p->p_spin);
256 spin_unlock(&p->p_spin);
265 return (vop_stdclose(ap));
269 * do an ioctl operation on a pfsnode (vp).
270 * (vp) is not locked on entry or exit.
273 procfs_ioctl(struct vop_ioctl_args *ap)
275 struct pfsnode *pfs = VTOPFS(ap->a_vp);
280 struct procfs_status *psp;
283 procp = pfs_pfind(pfs->pfs_pid);
292 /* Can't trace a process that's currently exec'ing. */
293 if ((procp->p_flags & P_INEXEC) != 0) {
297 if (!CHECKIO(p, procp) || p_trespass(ap->a_cred, procp->p_ucred)) {
302 switch (ap->a_command) {
304 procp->p_stops |= *(unsigned int*)ap->a_data;
307 procp->p_stops &= ~*(unsigned int*)ap->a_data;
311 * NFLAGS is "non-suser_xxx flags" -- currently, only
312 * PFS_ISUGID ("ignore set u/g id");
314 #define NFLAGS (PF_ISUGID)
315 flags = (unsigned char)*(unsigned int*)ap->a_data;
316 if (flags & NFLAGS && (error = priv_check_cred(ap->a_cred, PRIV_ROOT, 0)))
318 procp->p_pfsflags = flags;
321 *(unsigned int*)ap->a_data = (unsigned int)procp->p_pfsflags;
325 * NOTE: syscall entry deals with stopevents and may run without
328 psp = (struct procfs_status *)ap->a_data;
329 psp->flags = procp->p_pfsflags;
330 psp->events = procp->p_stops;
331 spin_lock(&procp->p_spin);
334 psp->why = procp->p_stype;
335 psp->val = procp->p_xstat;
336 spin_unlock(&procp->p_spin);
339 spin_unlock(&procp->p_spin);
340 psp->why = 0; /* Not defined values */
341 psp->val = 0; /* Not defined values */
346 * NOTE: syscall entry deals with stopevents and may run without
349 psp = (struct procfs_status *)ap->a_data;
350 spin_lock(&procp->p_spin);
351 while (procp->p_step == 0) {
352 tsleep_interlock(&procp->p_stype, PCATCH);
353 spin_unlock(&procp->p_spin);
354 error = tsleep(&procp->p_stype, PCATCH | PINTERLOCKED, "piocwait", 0);
357 spin_lock(&procp->p_spin);
359 spin_unlock(&procp->p_spin);
360 psp->state = 1; /* It stopped */
361 psp->flags = procp->p_pfsflags;
362 psp->events = procp->p_stops;
363 psp->why = procp->p_stype; /* why it stopped */
364 psp->val = procp->p_xstat; /* any extra info */
366 case PIOCCONT: /* Restart a proc */
368 * NOTE: syscall entry deals with stopevents and may run without
369 * the MP lock. However, the caller is presumably interlocked
372 if (procp->p_step == 0) {
373 error = EINVAL; /* Can only start a stopped process */
376 if ((signo = *(int*)ap->a_data) != 0) {
377 if (signo >= NSIG || signo <= 0) {
381 ksignal(procp, signo);
384 wakeup(&procp->p_step);
397 * do block mapping for pfsnode (vp).
398 * since we don't use the buffer cache
399 * for procfs this function should never
400 * be called. in any case, it's not clear
401 * what part of the kernel ever makes use
402 * of this function. for sanity, this is the
403 * usual no-op bmap, although returning
404 * (EIO) would be a reasonable alternative.
406 * XXX mmap assumes buffer cache operation
408 * procfs_bmap(struct vnode *a_vp, off_t a_loffset,
409 * off_t *a_doffsetp, int *a_runp, int *a_runb)
412 procfs_bmap(struct vop_bmap_args *ap)
414 if (ap->a_doffsetp != NULL)
415 *ap->a_doffsetp = ap->a_loffset;
416 if (ap->a_runp != NULL)
418 if (ap->a_runb != NULL)
424 * procfs_inactive is called when the pfsnode
425 * is vrele'd and the reference count goes
426 * to zero. (vp) will be on the vnode free
427 * list, so to get it back vget() must be
430 * (vp) is locked on entry, but must be unlocked on exit.
432 * procfs_inactive(struct vnode *a_vp)
435 procfs_inactive(struct vop_inactive_args *ap)
437 struct pfsnode *pfs = VTOPFS(ap->a_vp);
439 if (pfs->pfs_pid & PFS_DEAD)
445 * _reclaim is called when getnewvnode()
446 * wants to make use of an entry on the vnode
447 * free list. at this time the filesystem needs
448 * to free any private data and remove the node
449 * from any private lists.
451 * procfs_reclaim(struct vnode *a_vp)
454 procfs_reclaim(struct vop_reclaim_args *ap)
456 return (procfs_freevp(ap->a_vp));
460 * _print is used for debugging.
461 * just print a readable description
464 * procfs_print(struct vnode *a_vp)
467 procfs_print(struct vop_print_args *ap)
469 struct pfsnode *pfs = VTOPFS(ap->a_vp);
471 kprintf("tag VT_PROCFS, type %d, pid %ld, mode %x, flags %lx\n",
472 pfs->pfs_type, (long)pfs->pfs_pid, pfs->pfs_mode, pfs->pfs_flags);
477 * generic entry point for unsupported operations
480 procfs_badop(struct vop_generic_args *ap)
486 * Invent attributes for pfsnode (vp) and store
488 * Directories lengths are returned as zero since
489 * any real length would require the genuine size
490 * to be computed, and nothing cares anyway.
492 * this is relatively minimal for procfs.
494 * procfs_getattr(struct vnode *a_vp, struct vattr *a_vap)
497 procfs_getattr(struct vop_getattr_args *ap)
499 struct pfsnode *pfs = VTOPFS(ap->a_vp);
500 struct vattr *vap = ap->a_vap;
505 * First make sure that the process and its credentials
508 switch (pfs->pfs_type) {
514 procp = pfs_pfind(pfs->pfs_pid);
515 if (procp == NULL || procp->p_ucred == NULL) {
524 /* start by zeroing out the attributes */
527 /* next do all the common fields */
528 vap->va_type = ap->a_vp->v_type;
529 vap->va_mode = pfs->pfs_mode;
530 vap->va_fileid = pfs->pfs_fileno;
532 vap->va_blocksize = PAGE_SIZE;
533 vap->va_bytes = vap->va_size = 0;
534 vap->va_fsid = ap->a_vp->v_mount->mnt_stat.f_fsid.val[0];
537 * Make all times be current TOD.
538 * It would be possible to get the process start
539 * time from the p_stat structure, but there's
540 * no "file creation" time stamp anyway, and the
541 * p_stat structure is not addressible if u. gets
542 * swapped out for that process.
544 nanotime(&vap->va_ctime);
545 vap->va_atime = vap->va_mtime = vap->va_ctime;
548 * If the process has exercised some setuid or setgid
549 * privilege, then rip away read/write permission so
550 * that only root can gain access.
552 switch (pfs->pfs_type) {
558 if (procp->p_flags & P_SUGID) {
559 vap->va_mode &= ~((VREAD|VWRITE)|
561 ((VREAD|VWRITE)>>6));
569 * now do the object specific fields
571 * The size could be set from struct reg, but it's hardly
572 * worth the trouble, and it puts some (potentially) machine
573 * dependent data into this machine-independent code. If it
574 * becomes important then this function should break out into
575 * a per-file stat function in the corresponding .c file.
580 if (procp->p_ucred) {
581 vap->va_uid = procp->p_ucred->cr_uid;
582 vap->va_gid = procp->p_ucred->cr_gid;
589 switch (pfs->pfs_type) {
592 * Set nlink to 1 to tell fts(3) we don't actually know.
597 vap->va_size = vap->va_bytes = DEV_BSIZE;
601 char buf[16]; /* should be enough */
605 vap->va_size = ksnprintf(buf, sizeof(buf),
606 "%ld", (long)curproc->p_pid);
607 vap->va_bytes = vap->va_size;
612 vap->va_nlink = nproc_targets;
613 vap->va_size = vap->va_bytes = DEV_BSIZE;
617 char *fullpath, *freepath;
619 if (procp->p_textnch.ncp) {
622 cache_copy(&procp->p_textnch, &nch);
623 error = cache_fullpath(procp, &nch,
624 &fullpath, &freepath, 0);
631 vap->va_size = strlen(fullpath);
632 kfree(freepath, M_TEMP);
634 vap->va_size = sizeof("unknown") - 1;
637 vap->va_bytes = vap->va_size;
643 * If we denied owner access earlier, then we have to
644 * change the owner to root - otherwise 'ps' and friends
645 * will break even though they are setgid kmem. *SIGH*
647 if (procp->p_flags & P_SUGID)
649 else if (procp->p_ucred)
650 vap->va_uid = procp->p_ucred->cr_uid;
656 vap->va_bytes = vap->va_size = sizeof(struct reg);
660 vap->va_bytes = vap->va_size = sizeof(struct fpreg);
664 vap->va_bytes = vap->va_size = sizeof(struct dbreg);
678 panic("procfs_getattr");
686 * procfs_setattr(struct vnode *a_vp, struct vattr *a_vap,
687 * struct ucred *a_cred)
690 procfs_setattr(struct vop_setattr_args *ap)
692 if (ap->a_vap->va_flags != VNOVAL)
696 * just fake out attribute setting
697 * it's not good to generate an error
698 * return, otherwise things like creat()
699 * will fail when they try to set the
700 * file length to 0. worse, this means
701 * that echo $note > /proc/$pid/note will fail.
708 * implement access checking.
710 * procfs_access(struct vnode *a_vp, int a_mode, struct ucred *a_cred)
713 procfs_access(struct vop_access_args *ap)
718 error = VOP_GETATTR(ap->a_vp, &vattr);
720 error = vop_helper_access(ap, vattr.va_uid, vattr.va_gid,
726 * lookup. this is incredibly complicated in the general case, however
727 * for most pseudo-filesystems very little needs to be done.
729 * procfs_lookup(struct vnode *a_dvp, struct vnode **a_vpp,
730 * struct componentname *a_cnp)
733 procfs_lookup(struct vop_old_lookup_args *ap)
735 struct componentname *cnp = ap->a_cnp;
736 struct vnode **vpp = ap->a_vpp;
737 struct vnode *dvp = ap->a_dvp;
738 char *pname = cnp->cn_nameptr;
739 /* struct proc *curp = cnp->cn_proc; */
740 struct proc_target *pt;
750 if (cnp->cn_nameiop == NAMEI_DELETE || cnp->cn_nameiop == NAMEI_RENAME)
755 if (cnp->cn_namelen == 1 && *pname == '.') {
762 switch (pfs->pfs_type) {
764 if (cnp->cn_flags & CNP_ISDOTDOT)
767 if (CNEQ(cnp, "curproc", 7)) {
768 error = procfs_allocvp(dvp->v_mount, vpp, 0, Pcurproc);
772 pid = atopid(pname, cnp->cn_namelen);
780 if (!PRISON_CHECK(ap->a_cnp->cn_cred, p->p_ucred))
783 if (ps_showallprocs == 0 && ap->a_cnp->cn_cred->cr_uid != 0 &&
784 ap->a_cnp->cn_cred->cr_uid != p->p_ucred->cr_uid)
787 error = procfs_allocvp(dvp->v_mount, vpp, pid, Pproc);
791 if (cnp->cn_flags & CNP_ISDOTDOT) {
792 error = procfs_root(dvp->v_mount, vpp);
796 p = pfs_pfind(pfs->pfs_pid);
800 lp = FIRST_LWP_IN_PROC(p);
802 if (!PRISON_CHECK(ap->a_cnp->cn_cred, p->p_ucred))
805 if (ps_showallprocs == 0 && ap->a_cnp->cn_cred->cr_uid != 0 &&
806 ap->a_cnp->cn_cred->cr_uid != p->p_ucred->cr_uid)
809 for (pt = proc_targets, i = 0; i < nproc_targets; pt++, i++) {
810 if (cnp->cn_namelen == pt->pt_namlen &&
811 bcmp(pt->pt_name, pname, cnp->cn_namelen) == 0 &&
812 (pt->pt_valid == NULL || (*pt->pt_valid)(lp)))
817 error = procfs_allocvp(dvp->v_mount, vpp, pfs->pfs_pid,
825 if (cnp->cn_nameiop == NAMEI_LOOKUP)
830 * If no error occured *vpp will hold a referenced locked vnode.
831 * dvp was passed to us locked and *vpp must be returned locked.
832 * If *vpp != dvp then we should unlock dvp if (1) this is not the
833 * last component or (2) CNP_LOCKPARENT is not set.
836 if (error == 0 && *vpp != dvp) {
837 if ((cnp->cn_flags & CNP_LOCKPARENT) == 0) {
838 cnp->cn_flags |= CNP_PDIRUNLOCK;
847 * Does this process have a text file?
850 procfs_validfile(struct lwp *lp)
852 return (procfs_findtextvp(lp->lwp_proc) != NULLVP);
856 * readdir() returns directory entries from pfsnode (vp).
858 * We generate just one directory entry at a time, as it would probably
859 * not pay off to buffer several entries locally to save uiomove calls.
861 * procfs_readdir(struct vnode *a_vp, struct uio *a_uio, struct ucred *a_cred,
862 * int *a_eofflag, int *a_ncookies, off_t **a_cookies)
865 procfs_readdir(struct vop_readdir_args *ap)
870 if (ap->a_uio->uio_offset < 0 || ap->a_uio->uio_offset > INT_MAX)
872 if ((error = vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY)) != 0)
874 pfs = VTOPFS(ap->a_vp);
876 switch (pfs->pfs_type) {
879 * this is for the process-specific sub-directories.
880 * all that is needed to is copy out all the entries
881 * from the procent[] table (top of this file).
883 error = procfs_readdir_proc(ap);
887 * this is for the root of the procfs filesystem
888 * what is needed is a special entry for "curproc"
889 * followed by an entry for each process on allproc
891 error = procfs_readdir_root(ap);
903 procfs_readdir_proc(struct vop_readdir_args *ap)
906 int error, i, retval;
909 struct proc_target *pt;
910 struct uio *uio = ap->a_uio;
912 pfs = VTOPFS(ap->a_vp);
913 p = pfs_pfind(pfs->pfs_pid);
916 if (!PRISON_CHECK(ap->a_cred, p->p_ucred)) {
920 /* XXX lwp, not MPSAFE */
921 lp = FIRST_LWP_IN_PROC(p);
924 i = (int)uio->uio_offset;
930 for (pt = &proc_targets[i];
931 !error && uio->uio_resid > 0 && i < nproc_targets; pt++, i++) {
932 if (pt->pt_valid && (*pt->pt_valid)(lp) == 0)
935 retval = vop_write_dirent(&error, uio,
936 PROCFS_FILENO(pfs->pfs_pid, pt->pt_pfstype), pt->pt_type,
937 pt->pt_namlen, pt->pt_name);
942 uio->uio_offset = (off_t)i;
949 struct procfs_readdir_root_info {
957 static int procfs_readdir_root_callback(struct proc *p, void *data);
960 procfs_readdir_root(struct vop_readdir_args *ap)
962 struct procfs_readdir_root_info info;
963 struct uio *uio = ap->a_uio;
967 info.i = (int)uio->uio_offset;
974 info.cred = ap->a_cred;
975 while (info.pcnt < 3) {
976 res = procfs_readdir_root_callback(NULL, &info);
981 allproc_scan(procfs_readdir_root_callback, &info);
982 uio->uio_offset = (off_t)info.i;
988 procfs_readdir_root_callback(struct proc *p, void *data)
990 struct procfs_readdir_root_info *info = data;
1001 if (uio->uio_resid <= 0 || info->error)
1004 switch (info->pcnt) {
1006 d_ino = PROCFS_FILENO(0, Proot);
1012 d_ino = PROCFS_FILENO(0, Proot);
1019 d_ino = PROCFS_FILENO(0, Pcurproc);
1027 if (!PRISON_CHECK(info->cred, p->p_ucred))
1029 if (ps_showallprocs == 0 &&
1030 info->cred->cr_uid != 0 &&
1031 info->cred->cr_uid != p->p_ucred->cr_uid) {
1036 * Skip entries we have already returned (optimization)
1038 if (info->pcnt < info->i) {
1043 d_ino = PROCFS_FILENO(p->p_pid, Pproc);
1044 d_namlen = ksnprintf(d_name_pid, sizeof(d_name_pid),
1045 "%ld", (long)p->p_pid);
1046 d_name = d_name_pid;
1052 * Skip entries we have already returned (optimization)
1054 if (info->pcnt < info->i) {
1059 retval = vop_write_dirent(&info->error, uio,
1060 d_ino, d_type, d_namlen, d_name);
1069 * readlink reads the link of `curproc' or `file'
1072 procfs_readlink(struct vop_readlink_args *ap)
1074 char buf[16]; /* should be enough */
1076 struct vnode *vp = ap->a_vp;
1077 struct pfsnode *pfs = VTOPFS(vp);
1078 char *fullpath, *freepath;
1081 switch (pfs->pfs_type) {
1083 if (pfs->pfs_fileno != PROCFS_FILENO(0, Pcurproc))
1086 len = ksnprintf(buf, sizeof(buf), "%ld", (long)curproc->p_pid);
1088 return (uiomove(buf, len, ap->a_uio));
1090 * There _should_ be no way for an entire process to disappear
1094 procp = pfs_pfind(pfs->pfs_pid);
1095 if (procp == NULL || procp->p_ucred == NULL) {
1096 kprintf("procfs_readlink: pid %d disappeared\n",
1099 return (uiomove("unknown", sizeof("unknown") - 1,
1102 if (procp->p_textnch.ncp) {
1103 struct nchandle nch;
1105 cache_copy(&procp->p_textnch, &nch);
1106 error = cache_fullpath(procp, &nch,
1107 &fullpath, &freepath, 0);
1115 return (uiomove("unknown", sizeof("unknown") - 1,
1118 error = uiomove(fullpath, strlen(fullpath), ap->a_uio);
1119 kfree(freepath, M_TEMP);
1128 * convert decimal ascii to pid_t
1131 atopid(const char *b, u_int len)
1137 if (c < '0' || c > '9')
1139 p = 10 * p + (c - '0');