NetBSD-5.0.2/sys/compat/irix/irix_dirent.c
/* $NetBSD: irix_dirent.c,v 1.23 2008/04/28 20:23:41 martin Exp $ */
/*-
* Copyright (c) 1994, 2001, 2008 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Christos Zoulas and Emmanuel Dreyfus.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: irix_dirent.c,v 1.23 2008/04/28 20:23:41 martin Exp $");
#include <sys/types.h>
#include <sys/signal.h>
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/dirent.h>
#include <sys/fcntl.h>
#include <sys/file.h>
#include <sys/filedesc.h>
#include <sys/mount.h>
#include <sys/malloc.h>
#include <sys/namei.h>
#include <sys/systm.h>
#include <sys/vnode.h>
#include <compat/common/compat_util.h>
#include <compat/irix/irix_types.h>
#include <compat/irix/irix_signal.h>
#include <compat/irix/irix_syscall.h>
#include <compat/irix/irix_syscallargs.h>
/*
* irix_sys_ngetdents() is nearly a plain copy of svr4_sys_getdents(), from
* sys/compat/svr4/svr4_misc.c. We need a customized version to handle the
* eof flag.
* Obviously the code should be merged, but it would require some
* change to the way COMPAT_SVR4 code is set up.
*/
#define SVR4_RECLEN(de,namlen) ALIGN((SVR4_NAMEOFF(de) + (namlen) + 1))
#define SVR4_NAMEOFF(dp) ((char *)&(dp)->d_name - (char *)dp)
int
irix_sys_ngetdents(struct lwp *l, const struct irix_sys_ngetdents_args *uap, register_t *retval)
{
/* {
syscallarg(int) fildes;
syscallarg(irix_dirent_t *) buf;
syscallarg(unsigned short) nbyte;
syscallarg(int *) eof;
} */
struct dirent *bdp;
struct vnode *vp;
char *inp, *buf; /* BSD-format */
int len, reclen; /* BSD-format */
char *outp; /* SVR4-format */
int resid, svr4_reclen; /* SVR4-format */
struct file *fp;
struct uio auio;
struct iovec aiov;
struct irix_dirent idb;
off_t off; /* true file offset */
int buflen, error, eofflag;
off_t *cookiebuf = NULL, *cookie;
int ncookies, fd;
fd = SCARG(uap, fildes);
if ((error = fd_getvnode(fd, &fp)) != 0)
return (error);
if ((fp->f_flag & FREAD) == 0) {
error = EBADF;
goto out1;
}
vp = (struct vnode *)fp->f_data;
if (vp->v_type != VDIR) {
error = EINVAL;
goto out1;
}
buflen = min(MAXBSIZE, SCARG(uap, nbyte));
buf = malloc(buflen, M_TEMP, M_WAITOK);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
off = fp->f_offset;
again:
aiov.iov_base = buf;
aiov.iov_len = buflen;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_rw = UIO_READ;
auio.uio_resid = buflen;
auio.uio_offset = off;
UIO_SETUP_SYSSPACE(&auio);
/*
* First we read into the malloc'ed buffer, then
* we massage it into user space, one record at a time.
*/
error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, &cookiebuf,
&ncookies);
if (error)
goto out;
inp = buf;
outp = (char *)SCARG(uap, buf);
resid = SCARG(uap, nbyte);
if ((len = buflen - auio.uio_resid) == 0)
goto eof;
for (cookie = cookiebuf; len > 0; len -= reclen) {
bdp = (struct dirent *)inp;
reclen = bdp->d_reclen;
if (reclen & 3)
panic("irix_getdents: bad reclen");
if (cookie)
off = *cookie++; /* each entry points to the next */
else
off += reclen;
if ((off >> 32) != 0) {
compat_offseterr(vp, "irix_getdents");
error = EINVAL;
goto out;
}
if (bdp->d_fileno == 0) {
inp += reclen; /* it is a hole; squish it out */
continue;
}
svr4_reclen = SVR4_RECLEN(&idb, bdp->d_namlen);
if (reclen > len || resid < svr4_reclen) {
/* entry too big for buffer, so just stop */
outp++;
break;
}
/*
* Massage in place to make a SVR4-shaped dirent (otherwise
* we have to worry about touching user memory outside of
* the copyout() call).
*/
idb.d_ino = (irix_ino_t)bdp->d_fileno;
idb.d_off = (irix_off_t)off;
idb.d_reclen = (u_short)svr4_reclen;
strlcpy(idb.d_name, bdp->d_name, sizeof(idb.d_name));
if ((error = copyout((void *)&idb, outp, svr4_reclen)))
goto out;
/* advance past this real entry */
inp += reclen;
/* advance output past SVR4-shaped entry */
outp += svr4_reclen;
resid -= svr4_reclen;
}
/* if we squished out the whole block, try again */
if (outp == (char *)SCARG(uap, buf))
goto again;
fp->f_offset = off; /* update the vnode offset */
eof:
*retval = SCARG(uap, nbyte) - resid;
out:
VOP_UNLOCK(vp, 0);
if (cookiebuf)
free(cookiebuf, M_TEMP);
free(buf, M_TEMP);
out1:
fd_putfile(fd);
if (SCARG(uap, eof) != NULL)
error = copyout(&eofflag, SCARG(uap, eof), sizeof(int));
return error;
}
int
irix_sys_getdents(struct lwp *l, const struct irix_sys_getdents_args *uap, register_t *retval)
{
/* {
syscallarg(int) fildes;
syscallarg(irix_dirent_t *) buf;
syscallarg(unsigned short) nbyte;
syscallarg(int *) eof;
} */
struct irix_sys_ngetdents_args cup;
SCARG(&cup, fildes) = SCARG(uap, fildes);
SCARG(&cup, buf) = SCARG(uap, buf);
SCARG(&cup, nbyte) = SCARG(uap, nbytes);
SCARG(&cup, eof) = NULL;
return irix_sys_ngetdents(l, (void *)&cup, retval);
}
/*
* The 64 versions are very close to the
* 32 bit versions (only 3 lines of diff)
*/
int
irix_sys_ngetdents64(struct lwp *l, const struct irix_sys_ngetdents64_args *uap, register_t *retval)
{
/* {
syscallarg(int) fildes;
syscallarg(irix_dirent64_t *) buf;
syscallarg(unsigned short) nbyte;
syscallarg(int *) eof;
} */
struct dirent *bdp;
struct vnode *vp;
char *inp, *buf; /* BSD-format */
int len, reclen; /* BSD-format */
char *outp; /* SVR4-format */
int resid, svr4_reclen; /* SVR4-format */
file_t *fp;
struct uio auio;
struct iovec aiov;
struct irix_dirent64 idb;
off_t off; /* true file offset */
int buflen, error, eofflag;
off_t *cookiebuf = NULL, *cookie;
int ncookies, fd;
fd = SCARG(uap, fildes);
if ((error = fd_getvnode(fd, &fp)) != 0)
return (error);
if ((fp->f_flag & FREAD) == 0) {
error = EBADF;
goto out1;
}
vp = fp->f_data;
if (vp->v_type != VDIR) {
error = EINVAL;
goto out1;
}
buflen = min(MAXBSIZE, SCARG(uap, nbyte));
buf = malloc(buflen, M_TEMP, M_WAITOK);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
off = fp->f_offset;
again:
aiov.iov_base = buf;
aiov.iov_len = buflen;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_rw = UIO_READ;
auio.uio_resid = buflen;
auio.uio_offset = off;
UIO_SETUP_SYSSPACE(&auio);
/*
* First we read into the malloc'ed buffer, then
* we massage it into user space, one record at a time.
*/
error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, &cookiebuf,
&ncookies);
if (error)
goto out;
inp = buf;
outp = (char *)SCARG(uap, buf);
resid = SCARG(uap, nbyte);
if ((len = buflen - auio.uio_resid) == 0)
goto eof;
for (cookie = cookiebuf; len > 0; len -= reclen) {
bdp = (struct dirent *)inp;
reclen = bdp->d_reclen;
if (reclen & 3)
panic("irix_getdents64: bad reclen");
if (bdp->d_fileno == 0) {
inp += reclen; /* it is a hole; squish it out */
if (cookie)
off = *cookie++;
else
off += reclen;
continue;
}
svr4_reclen = SVR4_RECLEN(&idb, bdp->d_namlen);
if (reclen > len || resid < svr4_reclen) {
/* entry too big for buffer, so just stop */
outp++;
break;
}
if (cookie)
off = *cookie++; /* each entry points to the next */
else
off += reclen;
/*
* Massage in place to make a SVR4-shaped dirent (otherwise
* we have to worry about touching user memory outside of
* the copyout() call).
*/
idb.d_ino = (irix_ino64_t)bdp->d_fileno;
idb.d_off = (irix_off64_t)off;
idb.d_reclen = (u_short)svr4_reclen;
strlcpy(idb.d_name, bdp->d_name, sizeof(idb.d_name));
if ((error = copyout((void *)&idb, outp, svr4_reclen)))
goto out;
/* advance past this real entry */
inp += reclen;
/* advance output past SVR4-shaped entry */
outp += svr4_reclen;
resid -= svr4_reclen;
}
/* if we squished out the whole block, try again */
if (outp == (char *)SCARG(uap, buf))
goto again;
fp->f_offset = off; /* update the vnode offset */
eof:
*retval = SCARG(uap, nbyte) - resid;
out:
VOP_UNLOCK(vp, 0);
if (cookiebuf)
free(cookiebuf, M_TEMP);
free(buf, M_TEMP);
out1:
fd_putfile(fd);
if (SCARG(uap, eof) != NULL)
error = copyout(&eofflag, SCARG(uap, eof), sizeof(int));
return error;
}
int
irix_sys_getdents64(struct lwp *l, const struct irix_sys_getdents64_args *uap, register_t *retval)
{
/* {
syscallarg(int) fildes;
syscallarg(irix_dirent64_t *) buf;
syscallarg(unsigned short) nbyte;
syscallarg(int *) eof;
} */
struct irix_sys_ngetdents64_args cup;
SCARG(&cup, fildes) = SCARG(uap, fildes);
SCARG(&cup, buf) = SCARG(uap, buf);
SCARG(&cup, nbyte) = SCARG(uap, nbytes);
SCARG(&cup, eof) = NULL;
return irix_sys_ngetdents64(l, (void *)&cup, retval);
}