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/* $OpenBSD: compat_dir.c,v 1.11 2014/12/16 21:25:28 tedu Exp $ */
/*
* Copyright (c) 2000 Constantine Sapuntzakis
* 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. 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.
*
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/namei.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/filedesc.h>
#include <sys/ioctl.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/vnode.h>
#include <sys/lock.h>
#include <sys/dirent.h>
#include <compat/common/compat_dir.h>
int
readdir_with_callback(struct file *fp, off_t *off, u_long nbytes,
int (*appendfunc)(void *, struct dirent *), void *arg)
{
struct dirent *bdp;
caddr_t inp, buf;
int buflen;
struct uio auio;
struct iovec aiov;
int eofflag = 0;
int error, len, reclen;
off_t newoff = *off;
struct vnode *vp;
struct vattr va;
if ((fp->f_flag & FREAD) == 0)
return (EBADF);
vp = (struct vnode *)fp->f_data;
if (vp->v_type != VDIR)
return (EINVAL);
if ((error = VOP_GETATTR(vp, &va, fp->f_cred, curproc)) != 0)
return (error);
buflen = min(MAXBSIZE, nbytes);
buflen = max(buflen, va.va_blocksize);
buf = malloc(buflen, M_TEMP, M_WAITOK);
error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, curproc);
if (error) {
free(buf, M_TEMP, 0);
return (error);
}
again:
aiov.iov_base = buf;
aiov.iov_len = buflen;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_rw = UIO_READ;
auio.uio_segflg = UIO_SYSSPACE;
auio.uio_procp = curproc;
auio.uio_resid = buflen;
auio.uio_offset = newoff;
error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag);
*off = auio.uio_offset;
if (error)
goto out;
if ((len = buflen - auio.uio_resid) <= 0)
goto eof;
inp = buf;
for (; len > 0; len -= reclen, inp += reclen) {
bdp = (struct dirent *)inp;
reclen = bdp->d_reclen;
if (len < reclen)
break;
if (reclen & 3) {
error = EFAULT;
goto out;
}
/* Skip holes */
if (bdp->d_fileno != 0) {
if ((error = (*appendfunc) (arg, bdp)) != 0) {
if (error == ENOMEM)
error = 0;
break;
}
}
}
if (len <= 0 && !eofflag)
goto again;
eof:
out:
VOP_UNLOCK(vp, 0, curproc);
free(buf, M_TEMP, 0);
return (error);
}
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