NetBSD/sys/compat/netbsd32/netbsd32_fs.c

791 lines
19 KiB
C

/* $NetBSD: netbsd32_fs.c,v 1.5 2001/05/30 11:37:28 mrg Exp $ */
/*
* Copyright (c) 1998, 2001 Matthew R. Green
* All rights reserved.
*
* 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. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
#if defined(_KERNEL_OPT)
#include "opt_ktrace.h"
#endif
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mount.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/ktrace.h>
#include <sys/resourcevar.h>
#include <sys/vnode.h>
#include <sys/file.h>
#include <sys/filedesc.h>
#include <sys/namei.h>
#include <sys/syscallargs.h>
#include <sys/proc.h>
#include <compat/netbsd32/netbsd32.h>
#include <compat/netbsd32/netbsd32_syscallargs.h>
#include <compat/netbsd32/netbsd32_conv.h>
static int dofilereadv32 __P((struct proc *, int, struct file *, struct netbsd32_iovec *,
int, off_t *, int, register_t *));
static int dofilewritev32 __P((struct proc *, int, struct file *, struct netbsd32_iovec *,
int, off_t *, int, register_t *));
static int change_utimes32 __P((struct vnode *, netbsd32_timevalp_t, struct proc *));
int
netbsd32_getfsstat(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct netbsd32_getfsstat_args /* {
syscallarg(netbsd32_statfsp_t) buf;
syscallarg(netbsd32_long) bufsize;
syscallarg(int) flags;
} */ *uap = v;
struct mount *mp, *nmp;
struct statfs *sp;
struct netbsd32_statfs sb32;
caddr_t sfsp;
long count, maxcount, error;
maxcount = SCARG(uap, bufsize) / sizeof(struct netbsd32_statfs);
sfsp = (caddr_t)(u_long)SCARG(uap, buf);
simple_lock(&mountlist_slock);
count = 0;
for (mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) {
if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) {
nmp = mp->mnt_list.cqe_next;
continue;
}
if (sfsp && count < maxcount) {
sp = &mp->mnt_stat;
/*
* If MNT_NOWAIT or MNT_LAZY is specified, do not
* refresh the fsstat cache. MNT_WAIT or MNT_LAXY
* overrides MNT_NOWAIT.
*/
if (SCARG(uap, flags) != MNT_NOWAIT &&
SCARG(uap, flags) != MNT_LAZY &&
(SCARG(uap, flags) == MNT_WAIT ||
SCARG(uap, flags) == 0) &&
(error = VFS_STATFS(mp, sp, p)) != 0) {
simple_lock(&mountlist_slock);
nmp = mp->mnt_list.cqe_next;
vfs_unbusy(mp);
continue;
}
sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
sp->f_oflags = sp->f_flags & 0xffff;
netbsd32_from_statfs(sp, &sb32);
error = copyout(&sb32, sfsp, sizeof(sb32));
if (error) {
vfs_unbusy(mp);
return (error);
}
sfsp += sizeof(sb32);
}
count++;
simple_lock(&mountlist_slock);
nmp = mp->mnt_list.cqe_next;
vfs_unbusy(mp);
}
simple_unlock(&mountlist_slock);
if (sfsp && count > maxcount)
*retval = maxcount;
else
*retval = count;
return (0);
}
int
netbsd32_readv(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct netbsd32_readv_args /* {
syscallarg(int) fd;
syscallarg(const netbsd32_iovecp_t) iovp;
syscallarg(int) iovcnt;
} */ *uap = v;
int fd = SCARG(uap, fd);
struct file *fp;
struct filedesc *fdp = p->p_fd;
if ((u_int)fd >= fdp->fd_nfiles ||
(fp = fdp->fd_ofiles[fd]) == NULL ||
(fp->f_flag & FREAD) == 0)
return (EBADF);
return (dofilereadv32(p, fd, fp, (struct netbsd32_iovec *)(u_long)SCARG(uap, iovp),
SCARG(uap, iovcnt), &fp->f_offset, FOF_UPDATE_OFFSET, retval));
}
/* Damn thing copies in the iovec! */
int
dofilereadv32(p, fd, fp, iovp, iovcnt, offset, flags, retval)
struct proc *p;
int fd;
struct file *fp;
struct netbsd32_iovec *iovp;
int iovcnt;
off_t *offset;
int flags;
register_t *retval;
{
struct uio auio;
struct iovec *iov;
struct iovec *needfree;
struct iovec aiov[UIO_SMALLIOV];
long i, cnt, error = 0;
u_int iovlen;
#ifdef KTRACE
struct iovec *ktriov = NULL;
#endif
/* note: can't use iovlen until iovcnt is validated */
iovlen = iovcnt * sizeof(struct iovec);
if ((u_int)iovcnt > UIO_SMALLIOV) {
if ((u_int)iovcnt > IOV_MAX)
return (EINVAL);
MALLOC(iov, struct iovec *, iovlen, M_IOV, M_WAITOK);
needfree = iov;
} else if ((u_int)iovcnt > 0) {
iov = aiov;
needfree = NULL;
} else
return (EINVAL);
auio.uio_iov = iov;
auio.uio_iovcnt = iovcnt;
auio.uio_rw = UIO_READ;
auio.uio_segflg = UIO_USERSPACE;
auio.uio_procp = p;
error = netbsd32_to_iovecin(iovp, iov, iovcnt);
if (error)
goto done;
auio.uio_resid = 0;
for (i = 0; i < iovcnt; i++) {
auio.uio_resid += iov->iov_len;
/*
* Reads return ssize_t because -1 is returned on error.
* Therefore we must restrict the length to SSIZE_MAX to
* avoid garbage return values.
*/
if (iov->iov_len > SSIZE_MAX || auio.uio_resid > SSIZE_MAX) {
error = EINVAL;
goto done;
}
iov++;
}
#ifdef KTRACE
/*
* if tracing, save a copy of iovec
*/
if (KTRPOINT(p, KTR_GENIO)) {
MALLOC(ktriov, struct iovec *, iovlen, M_TEMP, M_WAITOK);
memcpy((caddr_t)ktriov, (caddr_t)auio.uio_iov, iovlen);
}
#endif
cnt = auio.uio_resid;
error = (*fp->f_ops->fo_read)(fp, offset, &auio, fp->f_cred, flags);
if (error)
if (auio.uio_resid != cnt && (error == ERESTART ||
error == EINTR || error == EWOULDBLOCK))
error = 0;
cnt -= auio.uio_resid;
#ifdef KTRACE
if (KTRPOINT(p, KTR_GENIO))
if (error == 0) {
ktrgenio(p, fd, UIO_READ, ktriov, cnt,
error);
FREE(ktriov, M_TEMP);
}
#endif
*retval = cnt;
done:
if (needfree)
FREE(needfree, M_IOV);
return (error);
}
int
netbsd32_writev(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct netbsd32_writev_args /* {
syscallarg(int) fd;
syscallarg(const netbsd32_iovecp_t) iovp;
syscallarg(int) iovcnt;
} */ *uap = v;
int fd = SCARG(uap, fd);
struct file *fp;
struct filedesc *fdp = p->p_fd;
if ((u_int)fd >= fdp->fd_nfiles ||
(fp = fdp->fd_ofiles[fd]) == NULL ||
(fp->f_flag & FWRITE) == 0)
return (EBADF);
return (dofilewritev32(p, fd, fp, (struct netbsd32_iovec *)(u_long)SCARG(uap, iovp),
SCARG(uap, iovcnt), &fp->f_offset, FOF_UPDATE_OFFSET, retval));
}
int
dofilewritev32(p, fd, fp, iovp, iovcnt, offset, flags, retval)
struct proc *p;
int fd;
struct file *fp;
struct netbsd32_iovec *iovp;
int iovcnt;
off_t *offset;
int flags;
register_t *retval;
{
struct uio auio;
struct iovec *iov;
struct iovec *needfree;
struct iovec aiov[UIO_SMALLIOV];
long i, cnt, error = 0;
u_int iovlen;
#ifdef KTRACE
struct iovec *ktriov = NULL;
#endif
/* note: can't use iovlen until iovcnt is validated */
iovlen = iovcnt * sizeof(struct iovec);
if ((u_int)iovcnt > UIO_SMALLIOV) {
if ((u_int)iovcnt > IOV_MAX)
return (EINVAL);
MALLOC(iov, struct iovec *, iovlen, M_IOV, M_WAITOK);
needfree = iov;
} else if ((u_int)iovcnt > 0) {
iov = aiov;
needfree = NULL;
} else
return (EINVAL);
auio.uio_iov = iov;
auio.uio_iovcnt = iovcnt;
auio.uio_rw = UIO_WRITE;
auio.uio_segflg = UIO_USERSPACE;
auio.uio_procp = p;
error = netbsd32_to_iovecin(iovp, iov, iovcnt);
if (error)
goto done;
auio.uio_resid = 0;
for (i = 0; i < iovcnt; i++) {
auio.uio_resid += iov->iov_len;
/*
* Writes return ssize_t because -1 is returned on error.
* Therefore we must restrict the length to SSIZE_MAX to
* avoid garbage return values.
*/
if (iov->iov_len > SSIZE_MAX || auio.uio_resid > SSIZE_MAX) {
error = EINVAL;
goto done;
}
iov++;
}
#ifdef KTRACE
/*
* if tracing, save a copy of iovec
*/
if (KTRPOINT(p, KTR_GENIO)) {
MALLOC(ktriov, struct iovec *, iovlen, M_TEMP, M_WAITOK);
memcpy((caddr_t)ktriov, (caddr_t)auio.uio_iov, iovlen);
}
#endif
cnt = auio.uio_resid;
error = (*fp->f_ops->fo_write)(fp, offset, &auio, fp->f_cred, flags);
if (error) {
if (auio.uio_resid != cnt && (error == ERESTART ||
error == EINTR || error == EWOULDBLOCK))
error = 0;
if (error == EPIPE)
psignal(p, SIGPIPE);
}
cnt -= auio.uio_resid;
#ifdef KTRACE
if (KTRPOINT(p, KTR_GENIO))
if (error == 0) {
ktrgenio(p, fd, UIO_WRITE, ktriov, cnt,
error);
FREE(ktriov, M_TEMP);
}
#endif
*retval = cnt;
done:
if (needfree)
FREE(needfree, M_IOV);
return (error);
}
int
netbsd32_utimes(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct netbsd32_utimes_args /* {
syscallarg(const netbsd32_charp) path;
syscallarg(const netbsd32_timevalp_t) tptr;
} */ *uap = v;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, (char *)(u_long)SCARG(uap, path), p);
if ((error = namei(&nd)) != 0)
return (error);
error = change_utimes32(nd.ni_vp, SCARG(uap, tptr), p);
vrele(nd.ni_vp);
return (error);
}
/*
* Common routine to set access and modification times given a vnode.
*/
static int
change_utimes32(vp, tptr, p)
struct vnode *vp;
netbsd32_timevalp_t tptr;
struct proc *p;
{
struct netbsd32_timeval tv32[2];
struct timeval tv[2];
struct vattr vattr;
int error;
VATTR_NULL(&vattr);
if (tptr == NULL) {
microtime(&tv[0]);
tv[1] = tv[0];
vattr.va_vaflags |= VA_UTIMES_NULL;
} else {
error = copyin((caddr_t)(u_long)tptr, tv32, sizeof(tv32));
if (error)
return (error);
netbsd32_to_timeval(&tv32[0], &tv[0]);
netbsd32_to_timeval(&tv32[1], &tv[1]);
}
VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
vattr.va_atime.tv_sec = tv[0].tv_sec;
vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000;
vattr.va_mtime.tv_sec = tv[1].tv_sec;
vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000;
error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
VOP_UNLOCK(vp, 0);
return (error);
}
int
netbsd32_statfs(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct netbsd32_statfs_args /* {
syscallarg(const netbsd32_charp) path;
syscallarg(netbsd32_statfsp_t) buf;
} */ *uap = v;
struct mount *mp;
struct statfs *sp;
struct netbsd32_statfs s32;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, (char *)(u_long)SCARG(uap, path), p);
if ((error = namei(&nd)) != 0)
return (error);
mp = nd.ni_vp->v_mount;
sp = &mp->mnt_stat;
vrele(nd.ni_vp);
if ((error = VFS_STATFS(mp, sp, p)) != 0)
return (error);
sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
netbsd32_from_statfs(sp, &s32);
return (copyout(&s32, (caddr_t)(u_long)SCARG(uap, buf), sizeof(s32)));
}
int
netbsd32_fstatfs(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct netbsd32_fstatfs_args /* {
syscallarg(int) fd;
syscallarg(netbsd32_statfsp_t) buf;
} */ *uap = v;
struct file *fp;
struct mount *mp;
struct statfs *sp;
struct netbsd32_statfs s32;
int error;
/* getvnode() will use the descriptor for us */
if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
return (error);
mp = ((struct vnode *)fp->f_data)->v_mount;
sp = &mp->mnt_stat;
if ((error = VFS_STATFS(mp, sp, p)) != 0)
goto out;
sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
netbsd32_from_statfs(sp, &s32);
error = copyout(&s32, (caddr_t)(u_long)SCARG(uap, buf), sizeof(s32));
out:
FILE_UNUSE(fp, p);
return (error);
}
int
netbsd32_futimes(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct netbsd32_futimes_args /* {
syscallarg(int) fd;
syscallarg(const netbsd32_timevalp_t) tptr;
} */ *uap = v;
int error;
struct file *fp;
/* getvnode() will use the descriptor for us */
if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
return (error);
error = change_utimes32((struct vnode *)fp->f_data,
SCARG(uap, tptr), p);
FILE_UNUSE(fp, p);
return (error);
}
int
netbsd32_getdents(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct netbsd32_getdents_args /* {
syscallarg(int) fd;
syscallarg(netbsd32_charp) buf;
syscallarg(netbsd32_size_t) count;
} */ *uap = v;
struct file *fp;
int error, done;
/* getvnode() will use the descriptor for us */
if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
return (error);
if ((fp->f_flag & FREAD) == 0) {
error = EBADF;
goto out;
}
error = vn_readdir(fp, (caddr_t)(u_long)SCARG(uap, buf), UIO_USERSPACE,
SCARG(uap, count), &done, p, 0, 0);
*retval = done;
out:
FILE_UNUSE(fp, p);
return (error);
}
int
netbsd32_lutimes(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct netbsd32_lutimes_args /* {
syscallarg(const netbsd32_charp) path;
syscallarg(const netbsd32_timevalp_t) tptr;
} */ *uap = v;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, (caddr_t)(u_long)SCARG(uap, path), p);
if ((error = namei(&nd)) != 0)
return (error);
error = change_utimes32(nd.ni_vp, SCARG(uap, tptr), p);
vrele(nd.ni_vp);
return (error);
}
int
netbsd32___stat13(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct netbsd32___stat13_args /* {
syscallarg(const netbsd32_charp) path;
syscallarg(netbsd32_statp_t) ub;
} */ *uap = v;
struct netbsd32_stat sb32;
struct stat sb;
int error;
struct nameidata nd;
caddr_t sg;
const char *path;
path = (char *)(u_long)SCARG(uap, path);
sg = stackgap_init(p->p_emul);
CHECK_ALT_EXIST(p, &sg, path);
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, path, p);
if ((error = namei(&nd)) != 0)
return (error);
error = vn_stat(nd.ni_vp, &sb, p);
vput(nd.ni_vp);
if (error)
return (error);
netbsd32_from___stat13(&sb, &sb32);
error = copyout(&sb32, (caddr_t)(u_long)SCARG(uap, ub), sizeof(sb32));
return (error);
}
int
netbsd32___fstat13(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct netbsd32___fstat13_args /* {
syscallarg(int) fd;
syscallarg(netbsd32_statp_t) sb;
} */ *uap = v;
int fd = SCARG(uap, fd);
struct filedesc *fdp = p->p_fd;
struct file *fp;
struct netbsd32_stat sb32;
struct stat ub;
int error = 0;
if ((u_int)fd >= fdp->fd_nfiles ||
(fp = fdp->fd_ofiles[fd]) == NULL)
return (EBADF);
FILE_USE(fp);
error = (*fp->f_ops->fo_stat)(fp, &ub, p);
FILE_UNUSE(fp, p);
if (error == 0) {
netbsd32_from___stat13(&ub, &sb32);
error = copyout(&sb32, (caddr_t)(u_long)SCARG(uap, sb), sizeof(sb32));
}
return (error);
}
int
netbsd32___lstat13(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct netbsd32___lstat13_args /* {
syscallarg(const netbsd32_charp) path;
syscallarg(netbsd32_statp_t) ub;
} */ *uap = v;
struct netbsd32_stat sb32;
struct stat sb;
int error;
struct nameidata nd;
caddr_t sg;
const char *path;
path = (char *)(u_long)SCARG(uap, path);
sg = stackgap_init(p->p_emul);
CHECK_ALT_EXIST(p, &sg, path);
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, path, p);
if ((error = namei(&nd)) != 0)
return (error);
error = vn_stat(nd.ni_vp, &sb, p);
vput(nd.ni_vp);
if (error)
return (error);
netbsd32_from___stat13(&sb, &sb32);
error = copyout(&sb32, (caddr_t)(u_long)SCARG(uap, ub), sizeof(sb32));
return (error);
}
int
netbsd32_preadv(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct netbsd32_preadv_args /* {
syscallarg(int) fd;
syscallarg(const netbsd32_iovecp_t) iovp;
syscallarg(int) iovcnt;
syscallarg(int) pad;
syscallarg(off_t) offset;
} */ *uap = v;
struct filedesc *fdp = p->p_fd;
struct file *fp;
struct vnode *vp;
off_t offset;
int error, fd = SCARG(uap, fd);
if ((u_int)fd >= fdp->fd_nfiles ||
(fp = fdp->fd_ofiles[fd]) == NULL ||
(fp->f_flag & FREAD) == 0)
return (EBADF);
vp = (struct vnode *)fp->f_data;
if (fp->f_type != DTYPE_VNODE
|| vp->v_type == VFIFO)
return (ESPIPE);
offset = SCARG(uap, offset);
/*
* XXX This works because no file systems actually
* XXX take any action on the seek operation.
*/
if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0)
return (error);
return (dofilereadv32(p, fd, fp, (struct netbsd32_iovec *)(u_long)SCARG(uap, iovp), SCARG(uap, iovcnt),
&offset, 0, retval));
}
int
netbsd32_pwritev(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct netbsd32_pwritev_args /* {
syscallarg(int) fd;
syscallarg(const netbsd32_iovecp_t) iovp;
syscallarg(int) iovcnt;
syscallarg(int) pad;
syscallarg(off_t) offset;
} */ *uap = v;
struct filedesc *fdp = p->p_fd;
struct file *fp;
struct vnode *vp;
off_t offset;
int error, fd = SCARG(uap, fd);
if ((u_int)fd >= fdp->fd_nfiles ||
(fp = fdp->fd_ofiles[fd]) == NULL ||
(fp->f_flag & FWRITE) == 0)
return (EBADF);
vp = (struct vnode *)fp->f_data;
if (fp->f_type != DTYPE_VNODE
|| vp->v_type == VFIFO)
return (ESPIPE);
offset = SCARG(uap, offset);
/*
* XXX This works because no file systems actually
* XXX take any action on the seek operation.
*/
if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0)
return (error);
return (dofilewritev32(p, fd, fp, (struct netbsd32_iovec *)(u_long)SCARG(uap, iovp), SCARG(uap, iovcnt),
&offset, 0, retval));
}
/*
* Find pathname of process's current directory.
*
* Use vfs vnode-to-name reverse cache; if that fails, fall back
* to reading directory contents.
*/
int
getcwd_common __P((struct vnode *, struct vnode *,
char **, char *, int, int, struct proc *));
int netbsd32___getcwd(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct netbsd32___getcwd_args /* {
syscallarg(char *) bufp;
syscallarg(size_t) length;
} */ *uap = v;
int error;
char *path;
char *bp, *bend;
int len = (int)SCARG(uap, length);
int lenused;
if (len > MAXPATHLEN*4)
len = MAXPATHLEN*4;
else if (len < 2)
return ERANGE;
path = (char *)malloc(len, M_TEMP, M_WAITOK);
if (!path)
return ENOMEM;
bp = &path[len];
bend = bp;
*(--bp) = '\0';
/*
* 5th argument here is "max number of vnodes to traverse".
* Since each entry takes up at least 2 bytes in the output buffer,
* limit it to N/2 vnodes for an N byte buffer.
*/
#define GETCWD_CHECK_ACCESS 0x0001
error = getcwd_common (p->p_cwdi->cwdi_cdir, NULL, &bp, path, len/2,
GETCWD_CHECK_ACCESS, p);
if (error)
goto out;
lenused = bend - bp;
*retval = lenused;
/* put the result into user buffer */
error = copyout(bp, (caddr_t)(u_long)SCARG(uap, bufp), lenused);
out:
free(path, M_TEMP);
return error;
}