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|
/*
* Copyright (c) 2001 Jonathan Lemon <jlemon@freebsd.org>
* Copyright (c) 2000 Dag-Erling Coïdan Smørgrav
* Copyright (c) 1999 Pierre Beyssac
* Copyright (c) 1993, 1995 Jan-Simon Pendry
* Copyright (c) 1993, 1995
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Jan-Simon Pendry.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)procfs_vnops.c 8.18 (Berkeley) 5/21/95
*
* $FreeBSD$
*/
/*
* procfs vnode interface
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/fcntl.h>
#include <sys/proc.h>
#include <sys/signalvar.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/namei.h>
#include <sys/dirent.h>
#include <sys/malloc.h>
#include <machine/reg.h>
#include <vm/vm_zone.h>
#include <compat/linprocfs/linprocfs.h>
#include <sys/pioctl.h>
extern struct vnode *procfs_findtextvp __P((struct proc *));
extern int procfs_kmemaccess __P((struct proc *));
static int linprocfs_access __P((struct vop_access_args *));
static int linprocfs_badop __P((void));
static int linprocfs_bmap __P((struct vop_bmap_args *));
static int linprocfs_close __P((struct vop_close_args *));
static int linprocfs_getattr __P((struct vop_getattr_args *));
static int linprocfs_inactive __P((struct vop_inactive_args *));
static int linprocfs_ioctl __P((struct vop_ioctl_args *));
static int linprocfs_lookup __P((struct vop_lookup_args *));
static int linprocfs_open __P((struct vop_open_args *));
static int linprocfs_print __P((struct vop_print_args *));
static int linprocfs_readdir __P((struct vop_readdir_args *));
static int linprocfs_readlink __P((struct vop_readlink_args *));
static int linprocfs_reclaim __P((struct vop_reclaim_args *));
static int linprocfs_setattr __P((struct vop_setattr_args *));
static pid_t atopid __P((const char *, u_int));
#define N(s) s, sizeof(s)-1
#define A(s) linprocfs_ ## s
#define D(s) (node_action_t *)(s)
struct node_data net_dir[] = {
{ N("."), VDIR, 0555, 0, D(net_dir) },
{ N(".."), VDIR, 0555, 0, D(root_dir) },
{ N("dev"), VREG, 0444, 0, A(donetdev) },
{ N(""), VNON, 0000, 0, NULL },
};
struct node_data proc_dir[] = {
{ N("."), VDIR, 0555, PDEP, D(proc_dir) },
{ N(".."), VDIR, 0555, 0, D(root_dir) },
{ N("cmdline"), VREG, 0444, PDEP, procfs_docmdline },
{ N("exe"), VLNK, 0444, PDEP, A(doexelink) },
{ N("mem"), VREG, 0600, PDEP, procfs_domem },
{ N("stat"), VREG, 0444, PDEP, A(doprocstat) },
{ N("status"), VREG, 0444, PDEP, A(doprocstatus) },
{ N(""), VNON, 0000, 0, NULL },
};
struct node_data root_dir[] = {
{ N("."), VDIR, 0555, 0, D(root_dir) },
{ N(".."), VDIR, 0555, 0, NULL },
{ N("cmdline"), VREG, 0444, 0, A(docmdline) },
{ N("cpuinfo"), VREG, 0444, 0, A(docpuinfo) },
{ N("devices"), VREG, 0444, 0, A(dodevices) },
{ N("meminfo"), VREG, 0444, 0, A(domeminfo) },
{ N("net"), VDIR, 0555, 0, D(net_dir) },
{ N("self"), VLNK, 0444, 0, A(doselflink) },
{ N("stat"), VREG, 0444, 0, A(dostat) },
{ N("uptime"), VREG, 0444, 0, A(douptime) },
{ N("version"), VREG, 0444, 0, A(doversion) },
{ N(""), VNON, 0000, 0, NULL },
};
#undef N
#undef A
static int vn2ft[] = {
DT_UNKNOWN, /* VNON */
DT_REG, /* VREG */
DT_DIR, /* VDIR */
DT_BLK, /* VBLK */
DT_CHR, /* VCHR */
DT_LNK, /* VLNK */
DT_SOCK, /* VSOCK */
DT_FIFO, /* VFIFO */
DT_UNKNOWN, /* VBAD */
};
/*
* set things up for doing i/o on
* the pfsnode (vp). (vp) is locked
* on entry, and should be left locked
* on exit.
*
* for procfs we don't need to do anything
* in particular for i/o. all that is done
* is to support exclusive open on process
* memory images.
*/
static int
linprocfs_open(ap)
struct vop_open_args /* {
struct vnode *a_vp;
int a_mode;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap;
{
struct pfsnode *pfs = VTOPFS(ap->a_vp);
struct node_data *nd = pfs->pfs_nd;
struct proc *p1, *p2 = NULL;
if (nd->nd_flags & PDEP) {
p2 = PFIND(pfs->pfs_pid);
if (p2 == NULL)
return (ENOENT);
if (pfs->pfs_pid && p_can(ap->a_p, p2, P_CAN_SEE, NULL))
return (ENOENT);
}
if (nd->nd_action == procfs_domem) {
if (((pfs->pfs_flags & FWRITE) && (ap->a_mode & O_EXCL)) ||
((pfs->pfs_flags & O_EXCL) && (ap->a_mode & FWRITE)))
return (EBUSY);
p1 = ap->a_p;
if (p_can(p1, p2, P_CAN_DEBUG, NULL) && !procfs_kmemaccess(p1))
return (EPERM);
if (ap->a_mode & FWRITE)
pfs->pfs_flags = ap->a_mode & (FWRITE|O_EXCL);
}
return (0);
}
/*
* close the pfsnode (vp) after doing i/o.
* (vp) is not locked on entry or exit.
*
* nothing to do for procfs other than undo
* any exclusive open flag (see _open above).
*/
static int
linprocfs_close(ap)
struct vop_close_args /* {
struct vnode *a_vp;
int a_fflag;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap;
{
struct pfsnode *pfs = VTOPFS(ap->a_vp);
struct proc *p;
if (pfs->pfs_nd->nd_action == procfs_domem) {
if ((ap->a_fflag & FWRITE) && (pfs->pfs_flags & O_EXCL))
pfs->pfs_flags &= ~(FWRITE|O_EXCL);
/*
* If this is the last close, then it checks to see if
* the target process has PF_LINGER set in p_pfsflags,
* if this is *not* the case, then the process' stop flags
* are cleared, and the process is woken up. This is
* to help prevent the case where a process has been
* told to stop on an event, but then the requesting process
* has gone away or forgotten about it.
*/
if ((ap->a_vp->v_usecount < 2) && (p = PFIND(pfs->pfs_pid))) {
PROC_LOCK(p);
if (!(p->p_pfsflags & PF_LINGER)) {
p->p_stops = 0;
p->p_step = 0;
PROC_UNLOCK(p);
wakeup(&p->p_step);
} else
PROC_UNLOCK(p);
}
}
return (0);
}
/*
* do an ioctl operation on a pfsnode (vp).
* (vp) is not locked on entry or exit.
*/
static int
linprocfs_ioctl(ap)
struct vop_ioctl_args *ap;
{
struct pfsnode *pfs = VTOPFS(ap->a_vp);
struct proc *procp, *p;
int error;
int signo;
struct procfs_status *psp;
unsigned char flags;
p = ap->a_p;
procp = PFIND(pfs->pfs_pid);
if (procp == NULL)
return ENOTTY;
if ((error = p_can(p, procp, P_CAN_DEBUG, NULL)))
return (error == ESRCH ? ENOENT : error);
switch (ap->a_command) {
case PIOCBIS:
PROC_LOCK(procp);
procp->p_stops |= *(unsigned int*)ap->a_data;
PROC_UNLOCK(procp);
break;
case PIOCBIC:
PROC_LOCK(procp);
procp->p_stops &= ~*(unsigned int*)ap->a_data;
PROC_UNLOCK(procp);
break;
case PIOCSFL:
/*
* NFLAGS is "non-suser_xxx flags" -- currently, only
* PFS_ISUGID ("ignore set u/g id");
*/
#define NFLAGS (PF_ISUGID)
flags = (unsigned char)*(unsigned int*)ap->a_data;
if (flags & NFLAGS && (error = suser(p)))
return error;
PROC_LOCK(procp);
procp->p_pfsflags = flags;
PROC_UNLOCK(procp);
break;
case PIOCGFL:
PROC_LOCK(procp);
*(unsigned int*)ap->a_data = (unsigned int)procp->p_pfsflags;
PROC_UNLOCK(procp);
/* FALLTHROUGH */
case PIOCSTATUS:
psp = (struct procfs_status *)ap->a_data;
PROC_LOCK(procp);
psp->state = (procp->p_step == 0);
psp->flags = procp->p_pfsflags;
psp->events = procp->p_stops;
if (procp->p_step) {
psp->why = procp->p_stype;
psp->val = procp->p_xstat;
} else {
psp->why = psp->val = 0; /* Not defined values */
}
PROC_UNLOCK(procp);
break;
case PIOCWAIT:
psp = (struct procfs_status *)ap->a_data;
PROC_LOCK(procp);
if (procp->p_step == 0) {
error = msleep(&procp->p_stype, &procp->p_mtx, PWAIT | PCATCH,
"piocwait", 0);
if (error) {
PROC_UNLOCK(procp);
return error;
}
}
psp->state = 1; /* It stopped */
psp->flags = procp->p_pfsflags;
psp->events = procp->p_stops;
psp->why = procp->p_stype; /* why it stopped */
psp->val = procp->p_xstat; /* any extra info */
PROC_UNLOCK(procp);
break;
case PIOCCONT: /* Restart a proc */
PROC_LOCK(procp);
if (procp->p_step == 0) {
PROC_UNLOCK(procp);
return EINVAL; /* Can only start a stopped process */
}
if ((signo = *(int*)ap->a_data) != 0) {
if (signo >= NSIG || signo <= 0) {
PROC_UNLOCK(procp);
return EINVAL;
}
psignal(procp, signo);
}
procp->p_step = 0;
PROC_UNLOCK(procp);
wakeup(&procp->p_step);
break;
default:
return (ENOTTY);
}
return 0;
}
/*
* do block mapping for pfsnode (vp).
* since we don't use the buffer cache
* for procfs this function should never
* be called. in any case, it's not clear
* what part of the kernel ever makes use
* of this function. for sanity, this is the
* usual no-op bmap, although returning
* (EIO) would be a reasonable alternative.
*/
static int
linprocfs_bmap(ap)
struct vop_bmap_args /* {
struct vnode *a_vp;
daddr_t a_bn;
struct vnode **a_vpp;
daddr_t *a_bnp;
int *a_runp;
} */ *ap;
{
if (ap->a_vpp != NULL)
*ap->a_vpp = ap->a_vp;
if (ap->a_bnp != NULL)
*ap->a_bnp = ap->a_bn;
if (ap->a_runp != NULL)
*ap->a_runp = 0;
return (0);
}
/*
* linprocfs_inactive is called when the pfsnode
* is vrele'd and the reference count goes
* to zero. (vp) will be on the vnode free
* list, so to get it back vget() must be
* used.
*
* (vp) is locked on entry, but must be unlocked on exit.
*/
static int
linprocfs_inactive(ap)
struct vop_inactive_args /* {
struct vnode *a_vp;
} */ *ap;
{
struct vnode *vp = ap->a_vp;
VOP_UNLOCK(vp, 0, ap->a_p);
return (0);
}
/*
* _reclaim is called when getnewvnode()
* wants to make use of an entry on the vnode
* free list. at this time the filesystem needs
* to free any private data and remove the node
* from any private lists.
*/
static int
linprocfs_reclaim(ap)
struct vop_reclaim_args /* {
struct vnode *a_vp;
} */ *ap;
{
return (linprocfs_freevp(ap->a_vp));
}
/*
* _print is used for debugging.
* just print a readable description
* of (vp).
*/
static int
linprocfs_print(ap)
struct vop_print_args /* {
struct vnode *a_vp;
} */ *ap;
{
struct pfsnode *pfs = VTOPFS(ap->a_vp);
struct node_data *nd = pfs->pfs_nd;
printf("tag VT_PROCFS, name %s, pid %ld, mode %x, flags %lx\n",
nd->nd_name, (long)pfs->pfs_pid, nd->nd_mode, pfs->pfs_flags);
return (0);
}
/*
* generic entry point for unsupported operations
*/
static int
linprocfs_badop()
{
return (EIO);
}
/*
* Invent attributes for pfsnode (vp) and store
* them in (vap).
* Directories lengths are returned as zero since
* any real length would require the genuine size
* to be computed, and nothing cares anyway.
*
* this is relatively minimal for procfs.
*/
static int
linprocfs_getattr(ap)
struct vop_getattr_args /* {
struct vnode *a_vp;
struct vattr *a_vap;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap;
{
struct pfsnode *pfs = VTOPFS(ap->a_vp);
struct node_data *nd = pfs->pfs_nd;
struct vattr *vap = ap->a_vap;
struct proc *procp;
/*
* First make sure that the process and its credentials
* still exist.
*/
if (nd->nd_flags & PDEP) {
procp = PFIND(pfs->pfs_pid);
if (procp == NULL)
return (ENOENT);
PROC_LOCK(procp);
if (procp->p_cred == NULL || procp->p_ucred == NULL) {
PROC_UNLOCK(procp);
return (ENOENT);
}
PROC_UNLOCK(procp);
if (p_can(ap->a_p, procp, P_CAN_SEE, NULL))
return (ENOENT);
} else {
procp = NULL;
}
/* start by zeroing out the attributes */
VATTR_NULL(vap);
/* next do all the common fields */
vap->va_type = ap->a_vp->v_type;
vap->va_mode = nd->nd_mode;
vap->va_fileid = pfs->pfs_fileno;
vap->va_flags = 0;
vap->va_blocksize = PAGE_SIZE;
vap->va_bytes = vap->va_size = 0;
vap->va_fsid = ap->a_vp->v_mount->mnt_stat.f_fsid.val[0];
vap->va_nlink = 1;
/*
* Make all times be current TOD.
* It would be possible to get the process start
* time from the p_stat structure, but there's
* no "file creation" time stamp anyway, and the
* p_stat structure is not addressible if u. gets
* swapped out for that process.
*/
nanotime(&vap->va_ctime);
vap->va_atime = vap->va_mtime = vap->va_ctime;
/*
* now do the object specific fields
*
* The size could be set from struct reg, but it's hardly
* worth the trouble, and it puts some (potentially) machine
* dependent data into this machine-independent code. If it
* becomes important then this function should break out into
* a per-file stat function in the corresponding .c file.
*/
if (procp) {
PROC_LOCK(procp);
vap->va_uid = procp->p_ucred->cr_uid;
vap->va_gid = procp->p_ucred->cr_gid;
PROC_UNLOCK(procp);
} else {
vap->va_uid = 0;
vap->va_gid = 0;
}
/*
* If the process has exercised some setuid or setgid
* privilege, then change the owner to root.
*/
if (nd->nd_action == procfs_domem) {
PROC_LOCK(procp);
if (procp->p_flag & P_SUGID)
vap->va_uid = 0;
PROC_UNLOCK(procp);
}
return (0);
}
static int
linprocfs_setattr(ap)
struct vop_setattr_args /* {
struct vnode *a_vp;
struct vattr *a_vap;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap;
{
if (ap->a_vap->va_flags != VNOVAL)
return (EOPNOTSUPP);
/*
* just fake out attribute setting
* it's not good to generate an error
* return, otherwise things like creat()
* will fail when they try to set the
* file length to 0. worse, this means
* that echo $note > /proc/$pid/note will fail.
*/
return (0);
}
/*
* implement access checking.
*
* actually, the check for super-user is slightly
* broken since it will allow read access to write-only
* objects. this doesn't cause any particular trouble
* but does mean that the i/o entry points need to check
* that the operation really does make sense.
*/
static int
linprocfs_access(ap)
struct vop_access_args /* {
struct vnode *a_vp;
int a_mode;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap;
{
struct pfsnode *pfs = VTOPFS(ap->a_vp);
struct vnode *vp = ap->a_vp;
struct proc *procp;
struct vattr *vap;
struct vattr vattr;
int error;
if (pfs->pfs_nd->nd_flags & PDEP) {
procp = PFIND(pfs->pfs_pid);
if (procp == NULL)
return (ENOENT);
if (p_can(ap->a_p, procp, P_CAN_SEE, NULL))
return (ENOENT);
}
vap = &vattr;
error = VOP_GETATTR(vp, vap, ap->a_cred, ap->a_p);
if (error)
return (error);
return (vaccess(vp->v_type, vap->va_mode, vap->va_uid, vap->va_gid,
ap->a_mode, ap->a_cred, NULL));
}
/*
* lookup. this is incredibly complicated in the
* general case, however for most pseudo-filesystems
* very little needs to be done.
*
* unless you want to get a migraine, just make sure your
* filesystem doesn't do any locking of its own. otherwise
* read and inwardly digest ufs_lookup().
*/
static int
linprocfs_lookup(ap)
struct vop_lookup_args /* {
struct vnode * a_dvp;
struct vnode ** a_vpp;
struct componentname * a_cnp;
} */ *ap;
{
struct componentname *cnp = ap->a_cnp;
struct proc *curp = cnp->cn_proc;
struct vnode **vpp = ap->a_vpp;
struct vnode *dvp = ap->a_dvp;
char *pname = cnp->cn_nameptr;
struct node_data *nd;
pid_t pid;
struct pfsnode *pfs;
struct proc *p;
int error;
*vpp = NULL;
if (cnp->cn_nameiop != LOOKUP)
return (EROFS);
if (cnp->cn_namelen == 1 && *pname == '.') {
*vpp = dvp;
VREF(dvp);
/* vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, curp); */
return (0);
}
pfs = VTOPFS(dvp);
nd = pfs->pfs_nd;
if (nd->nd_type != VDIR)
return (ENOTDIR);
if (cnp->cn_flags & ISDOTDOT) {
if (nd == root_dir)
return (EIO);
nd = (struct node_data *)nd[1].nd_action;
return (linprocfs_allocvp(dvp->v_mount, vpp, pfs->pfs_pid, nd));
}
/* generic lookup */
for (nd = pfs->pfs_nd; nd->nd_type != VNON; nd++) {
if (cnp->cn_namelen != nd->nd_namlen ||
memcmp(pname, nd->nd_name, nd->nd_namlen))
continue;
if (nd->nd_type == VDIR)
nd = (struct node_data *)nd->nd_action;
return (linprocfs_allocvp(dvp->v_mount, vpp, pfs->pfs_pid, nd));
}
error = ENOENT;
/* directory specific lookups */
if (pfs->pfs_nd == root_dir) {
pid = atopid(pname, cnp->cn_namelen);
if (pid == NO_PID)
goto done;
p = PFIND(pid);
if (p == NULL)
goto done;
if (p_can(curp, p, P_CAN_SEE, NULL))
goto done;
error = linprocfs_allocvp(dvp->v_mount, vpp, pid, proc_dir);
}
done:
return (error);
}
/*
* Does this process have a text file?
*/
int
linprocfs_validfile(p)
struct proc *p;
{
return (procfs_findtextvp(p) != NULLVP);
}
/*
* readdir() returns directory entries from pfsnode (vp).
*
* We generate just one directory entry at a time, as it would probably
* not pay off to buffer several entries locally to save uiomove calls.
*/
static int
linprocfs_readdir(ap)
struct vop_readdir_args /* {
struct vnode *a_vp;
struct uio *a_uio;
struct ucred *a_cred;
int *a_eofflag;
int *a_ncookies;
u_long **a_cookies;
} */ *ap;
{
struct uio *uio = ap->a_uio;
struct dirent d;
struct dirent *dp = &d;
struct pfsnode *pfs;
struct node_data *nd;
struct proc *p;
int i, start, copied, error, off;
static u_int delen;
if (!delen) {
d.d_namlen = PROCFS_NAMELEN;
delen = GENERIC_DIRSIZ(&d);
}
pfs = VTOPFS(ap->a_vp);
nd = pfs->pfs_nd;
if (nd->nd_type != VDIR)
return (ENOTDIR);
off = (int)uio->uio_offset;
if (off != uio->uio_offset || off < 0 ||
off % delen != 0 || uio->uio_resid < delen)
return (EINVAL);
error = 0;
copied = 0;
start = off / delen;
if (nd->nd_flags & PDEP) {
p = PFIND(pfs->pfs_pid);
if (p == NULL)
goto done;
if (p_can(curproc, p, P_CAN_SEE, NULL))
goto done;
}
/*
* copy out static entries
*/
for (i = 0; i < start && nd->nd_type != VNON; nd++, i++);
for (; uio->uio_resid >= delen && nd->nd_type != VNON; nd++, copied++) {
dp->d_reclen = delen;
dp->d_fileno = PROCFS_FILENO(nd, pfs->pfs_pid);
dp->d_namlen = nd->nd_namlen;
memcpy(dp->d_name, nd->nd_name, nd->nd_namlen + 1);
dp->d_type = vn2ft[nd->nd_type];
error = uiomove((caddr_t)dp, delen, uio);
if (error)
goto done;
}
/*
* this is for the root of the procfs filesystem
*/
if (pfs->pfs_nd == root_dir) {
sx_slock(&allproc_lock);
p = LIST_FIRST(&allproc);
i = (nd - pfs->pfs_nd) / sizeof(*nd);
while (p && i < start) {
if (p_can(curproc, p, P_CAN_SEE, NULL) == 0)
i++;
p = LIST_NEXT(p, p_list);
}
for (; p && uio->uio_resid >= delen; p = LIST_NEXT(p, p_list)) {
if (p_can(curproc, p, P_CAN_SEE, NULL))
continue;
dp->d_reclen = delen;
dp->d_fileno = PROCFS_FILENO(proc_dir, p->p_pid);
dp->d_namlen = sprintf(dp->d_name, "%ld",
(long)p->p_pid);
dp->d_type = DT_DIR;
error = uiomove((caddr_t)dp, delen, uio);
if (error)
break;
copied++;
}
sx_sunlock(&allproc_lock);
}
done:
uio->uio_offset += copied * delen;
return (error);
}
/*
* readlink reads the link of `self' or `exe'
*/
static int
linprocfs_readlink(ap)
struct vop_readlink_args *ap;
{
struct pfsnode *pfs = VTOPFS(ap->a_vp);
struct node_data *nd = pfs->pfs_nd;
/* sanity check */
if (nd->nd_type != VLNK)
return (EINVAL);
return (nd->nd_action(NULL, NULL, pfs, ap->a_uio));
}
/*
* convert decimal ascii to pid_t
*/
static pid_t
atopid(b, len)
const char *b;
u_int len;
{
pid_t p = 0;
while (len--) {
char c = *b++;
if (c < '0' || c > '9')
return (NO_PID);
p = 10 * p + (c - '0');
if (p > PID_MAX)
return (NO_PID);
}
return (p);
}
/*
* procfs vnode operations.
*/
vop_t **linprocfs_vnodeop_p;
static struct vnodeopv_entry_desc linprocfs_vnodeop_entries[] = {
{ &vop_default_desc, (vop_t *) vop_defaultop },
{ &vop_access_desc, (vop_t *) linprocfs_access },
{ &vop_advlock_desc, (vop_t *) linprocfs_badop },
{ &vop_bmap_desc, (vop_t *) linprocfs_bmap },
{ &vop_close_desc, (vop_t *) linprocfs_close },
{ &vop_create_desc, (vop_t *) linprocfs_badop },
{ &vop_getattr_desc, (vop_t *) linprocfs_getattr },
{ &vop_inactive_desc, (vop_t *) linprocfs_inactive },
{ &vop_link_desc, (vop_t *) linprocfs_badop },
{ &vop_lookup_desc, (vop_t *) linprocfs_lookup },
{ &vop_mkdir_desc, (vop_t *) linprocfs_badop },
{ &vop_mknod_desc, (vop_t *) linprocfs_badop },
{ &vop_open_desc, (vop_t *) linprocfs_open },
{ &vop_pathconf_desc, (vop_t *) vop_stdpathconf },
{ &vop_print_desc, (vop_t *) linprocfs_print },
{ &vop_read_desc, (vop_t *) linprocfs_rw },
{ &vop_readdir_desc, (vop_t *) linprocfs_readdir },
{ &vop_readlink_desc, (vop_t *) linprocfs_readlink },
{ &vop_reclaim_desc, (vop_t *) linprocfs_reclaim },
{ &vop_remove_desc, (vop_t *) linprocfs_badop },
{ &vop_rename_desc, (vop_t *) linprocfs_badop },
{ &vop_rmdir_desc, (vop_t *) linprocfs_badop },
{ &vop_setattr_desc, (vop_t *) linprocfs_setattr },
{ &vop_symlink_desc, (vop_t *) linprocfs_badop },
{ &vop_write_desc, (vop_t *) linprocfs_rw },
{ &vop_ioctl_desc, (vop_t *) linprocfs_ioctl },
{ NULL, NULL }
};
static struct vnodeopv_desc linprocfs_vnodeop_opv_desc =
{ &linprocfs_vnodeop_p, linprocfs_vnodeop_entries };
VNODEOP_SET(linprocfs_vnodeop_opv_desc);
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