af069b0649
as seek to teh last location saved will still work. This is needed for Samba to be able to correctly handle delete requests from windows. This does not completely fix seekdir when deletes are present but fixes the worst of the problems. The real solution must involve some changes to the API for eh VFS and getdirentries(2). Obtained from: Panzura inc MFC after: 1 week
142 lines
3.9 KiB
C
142 lines
3.9 KiB
C
/*
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* Copyright (c) 1983, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)readdir.c 8.3 (Berkeley) 9/29/94";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "namespace.h"
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#include <sys/param.h>
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#include <dirent.h>
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#include <errno.h>
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#include <string.h>
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#include <pthread.h>
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#include "un-namespace.h"
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#include "libc_private.h"
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#include "gen-private.h"
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#include "telldir.h"
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/*
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* get next entry in a directory.
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*/
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struct dirent *
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_readdir_unlocked(dirp, skip)
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DIR *dirp;
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int skip;
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{
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struct dirent *dp;
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long initial_seek;
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long initial_loc = 0;
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for (;;) {
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if (dirp->dd_loc >= dirp->dd_size) {
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if (dirp->dd_flags & __DTF_READALL)
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return (NULL);
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initial_loc = dirp->dd_loc;
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dirp->dd_flags &= ~__DTF_SKIPREAD;
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dirp->dd_loc = 0;
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}
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if (dirp->dd_loc == 0 &&
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!(dirp->dd_flags & (__DTF_READALL | __DTF_SKIPREAD))) {
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initial_seek = dirp->dd_seek;
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dirp->dd_size = _getdirentries(dirp->dd_fd,
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dirp->dd_buf, dirp->dd_len, &dirp->dd_seek);
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if (dirp->dd_size <= 0)
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return (NULL);
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_fixtelldir(dirp, initial_seek, initial_loc);
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}
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dirp->dd_flags &= ~__DTF_SKIPREAD;
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dp = (struct dirent *)(dirp->dd_buf + dirp->dd_loc);
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if ((long)dp & 03L) /* bogus pointer check */
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return (NULL);
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if (dp->d_reclen <= 0 ||
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dp->d_reclen > dirp->dd_len + 1 - dirp->dd_loc)
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return (NULL);
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dirp->dd_loc += dp->d_reclen;
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if (dp->d_ino == 0 && skip)
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continue;
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if (dp->d_type == DT_WHT && (dirp->dd_flags & DTF_HIDEW))
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continue;
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return (dp);
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}
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}
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struct dirent *
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readdir(dirp)
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DIR *dirp;
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{
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struct dirent *dp;
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if (__isthreaded) {
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_pthread_mutex_lock(&dirp->dd_lock);
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dp = _readdir_unlocked(dirp, 1);
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_pthread_mutex_unlock(&dirp->dd_lock);
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}
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else
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dp = _readdir_unlocked(dirp, 1);
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return (dp);
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}
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int
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readdir_r(dirp, entry, result)
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DIR *dirp;
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struct dirent *entry;
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struct dirent **result;
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{
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struct dirent *dp;
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int saved_errno;
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saved_errno = errno;
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errno = 0;
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if (__isthreaded) {
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_pthread_mutex_lock(&dirp->dd_lock);
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if ((dp = _readdir_unlocked(dirp, 1)) != NULL)
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memcpy(entry, dp, _GENERIC_DIRSIZ(dp));
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_pthread_mutex_unlock(&dirp->dd_lock);
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}
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else if ((dp = _readdir_unlocked(dirp, 1)) != NULL)
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memcpy(entry, dp, _GENERIC_DIRSIZ(dp));
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if (errno != 0) {
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if (dp == NULL)
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return (errno);
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} else
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errno = saved_errno;
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if (dp != NULL)
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*result = entry;
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else
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*result = NULL;
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return (0);
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}
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