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freebsd-nq/lib/libc/gen/telldir.c

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BSD 4.4 Lite Lib Sources
1994-05-27 05:00:24 +00:00
/*
* Copyright (c) 1983, 1993
* The Regents of the University of California. 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.
Renumber copyright clause 4 Renumber cluase 4 to 3, per what everybody else did when BSD granted them permission to remove clause 3. My insistance on keeping the same numbering for legal reasons is too pedantic, so give up on that point. Submitted by: Jan Schaumann <jschauma@stevens.edu> Pull Request: https://github.com/freebsd/freebsd/pull/96
2017-02-28 23:42:47 +00:00
* 3. Neither the name of the University nor the names of its contributors
BSD 4.4 Lite Lib Sources
1994-05-27 05:00:24 +00:00
* 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.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)telldir.c 8.1 (Berkeley) 6/4/93";
#endif /* LIBC_SCCS and not lint */
Fix SCM ID's.
2002-02-01 00:57:29 +00:00
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
BSD 4.4 Lite Lib Sources
1994-05-27 05:00:24 +00:00
Remove _THREAD_SAFE and make libc thread-safe by default by adding (weak definitions to) stubs for some of the pthread functions. If the threads library is linked in, the real pthread functions will pulled in. Use the following convention for system calls wrapped by the threads library: __sys_foo - actual system call _foo - weak definition to __sys_foo foo - weak definition to __sys_foo Change all libc uses of system calls wrapped by the threads library from foo to _foo. In order to define the prototypes for _foo(), we introduce namespace.h and un-namespace.h (suggested by bde). All files that need to reference these system calls, should include namespace.h before any standard includes, then include un-namespace.h after the standard includes and before any local includes. <db.h> is an exception and shouldn't be included in between namespace.h and un-namespace.h namespace.h will define foo to _foo, and un-namespace.h will undefine foo. Try to eliminate some of the recursive calls to MT-safe functions in libc/stdio in preparation for adding a mutex to FILE. We have recursive mutexes, but would like to avoid using them if possible. Remove uneeded includes of <errno.h> from a few files. Add $FreeBSD$ to a few files in order to pass commitprep. Approved by: -arch
2001-01-24 13:01:12 +00:00
#include "namespace.h"
BSD 4.4 Lite Lib Sources
1994-05-27 05:00:24 +00:00
#include <sys/param.h>
Move telldir position recording type definitions and prototypes to "telldir.h" in order to prevent namespace pollution in <dirent.h> (which was including <sys/queue.h>). Add $FreeBSD$ to rewinddir.c and seekdir.c.
2000-12-11 04:00:36 +00:00
#include <sys/queue.h>
BSD 4.4 Lite Lib Sources
1994-05-27 05:00:24 +00:00
#include <dirent.h>
Remove _THREAD_SAFE and make libc thread-safe by default by adding (weak definitions to) stubs for some of the pthread functions. If the threads library is linked in, the real pthread functions will pulled in. Use the following convention for system calls wrapped by the threads library: __sys_foo - actual system call _foo - weak definition to __sys_foo foo - weak definition to __sys_foo Change all libc uses of system calls wrapped by the threads library from foo to _foo. In order to define the prototypes for _foo(), we introduce namespace.h and un-namespace.h (suggested by bde). All files that need to reference these system calls, should include namespace.h before any standard includes, then include un-namespace.h after the standard includes and before any local includes. <db.h> is an exception and shouldn't be included in between namespace.h and un-namespace.h namespace.h will define foo to _foo, and un-namespace.h will undefine foo. Try to eliminate some of the recursive calls to MT-safe functions in libc/stdio in preparation for adding a mutex to FILE. We have recursive mutexes, but would like to avoid using them if possible. Remove uneeded includes of <errno.h> from a few files. Add $FreeBSD$ to a few files in order to pass commitprep. Approved by: -arch
2001-01-24 13:01:12 +00:00
#include <pthread.h>
BSD 4.4 Lite Lib Sources
1994-05-27 05:00:24 +00:00
#include <stdlib.h>
#include <unistd.h>
Remove _THREAD_SAFE and make libc thread-safe by default by adding (weak definitions to) stubs for some of the pthread functions. If the threads library is linked in, the real pthread functions will pulled in. Use the following convention for system calls wrapped by the threads library: __sys_foo - actual system call _foo - weak definition to __sys_foo foo - weak definition to __sys_foo Change all libc uses of system calls wrapped by the threads library from foo to _foo. In order to define the prototypes for _foo(), we introduce namespace.h and un-namespace.h (suggested by bde). All files that need to reference these system calls, should include namespace.h before any standard includes, then include un-namespace.h after the standard includes and before any local includes. <db.h> is an exception and shouldn't be included in between namespace.h and un-namespace.h namespace.h will define foo to _foo, and un-namespace.h will undefine foo. Try to eliminate some of the recursive calls to MT-safe functions in libc/stdio in preparation for adding a mutex to FILE. We have recursive mutexes, but would like to avoid using them if possible. Remove uneeded includes of <errno.h> from a few files. Add $FreeBSD$ to a few files in order to pass commitprep. Approved by: -arch
2001-01-24 13:01:12 +00:00
#include "un-namespace.h"
BSD 4.4 Lite Lib Sources
1994-05-27 05:00:24 +00:00
Remove _THREAD_SAFE and make libc thread-safe by default by adding (weak definitions to) stubs for some of the pthread functions. If the threads library is linked in, the real pthread functions will pulled in. Use the following convention for system calls wrapped by the threads library: __sys_foo - actual system call _foo - weak definition to __sys_foo foo - weak definition to __sys_foo Change all libc uses of system calls wrapped by the threads library from foo to _foo. In order to define the prototypes for _foo(), we introduce namespace.h and un-namespace.h (suggested by bde). All files that need to reference these system calls, should include namespace.h before any standard includes, then include un-namespace.h after the standard includes and before any local includes. <db.h> is an exception and shouldn't be included in between namespace.h and un-namespace.h namespace.h will define foo to _foo, and un-namespace.h will undefine foo. Try to eliminate some of the recursive calls to MT-safe functions in libc/stdio in preparation for adding a mutex to FILE. We have recursive mutexes, but would like to avoid using them if possible. Remove uneeded includes of <errno.h> from a few files. Add $FreeBSD$ to a few files in order to pass commitprep. Approved by: -arch
2001-01-24 13:01:12 +00:00
#include "libc_private.h"
Hide DIR definition by making it an opaque struct typedef. Introduce dirfd() libc exported symbol replacing macro with same name, preserve _dirfd() macro for internal use. Replace dirp->dd_fd with dirfd() call. Avoid using dirfd as variable name to prevent shadowing global symbol. Sponsored by: Google Summer Of Code 2011
2012-05-19 12:44:27 +00:00
#include "gen-private.h"
Move telldir position recording type definitions and prototypes to "telldir.h" in order to prevent namespace pollution in <dirent.h> (which was including <sys/queue.h>). Add $FreeBSD$ to rewinddir.c and seekdir.c.
2000-12-11 04:00:36 +00:00
#include "telldir.h"
BSD 4.4 Lite Lib Sources
1994-05-27 05:00:24 +00:00
/*
* return a pointer into a directory
*/
long
Use ANSI C prototypes. Eliminates -Wold-style-definition warnings.
2015-09-20 20:23:16 +00:00
telldir(DIR *dirp)
BSD 4.4 Lite Lib Sources
1994-05-27 05:00:24 +00:00
{
Move telldir position recording type definitions and prototypes to "telldir.h" in order to prevent namespace pollution in <dirent.h> (which was including <sys/queue.h>). Add $FreeBSD$ to rewinddir.c and seekdir.c.
2000-12-11 04:00:36 +00:00
struct ddloc *lp;
If telldir() is called immediately after a call to seekdir(), POSIX requires the return value of telldir() to equal the value passed to seekdir(). The current seekdir code with SINGLEUSE enabled breaks this case as each call to telldir() allocates a new cookie. Instead, remove the SINGLEUSE code and change telldir() to look for an existing cookie for the directory's current location rather than always creating a new cookie. CR: https://phabric.freebsd.org/D490 PR: 121656 Reviewed by: jilles MFC after: 1 week
2014-07-29 00:16:33 +00:00
long idx;
BSD 4.4 Lite Lib Sources
1994-05-27 05:00:24 +00:00
Remove _THREAD_SAFE and make libc thread-safe by default by adding (weak definitions to) stubs for some of the pthread functions. If the threads library is linked in, the real pthread functions will pulled in. Use the following convention for system calls wrapped by the threads library: __sys_foo - actual system call _foo - weak definition to __sys_foo foo - weak definition to __sys_foo Change all libc uses of system calls wrapped by the threads library from foo to _foo. In order to define the prototypes for _foo(), we introduce namespace.h and un-namespace.h (suggested by bde). All files that need to reference these system calls, should include namespace.h before any standard includes, then include un-namespace.h after the standard includes and before any local includes. <db.h> is an exception and shouldn't be included in between namespace.h and un-namespace.h namespace.h will define foo to _foo, and un-namespace.h will undefine foo. Try to eliminate some of the recursive calls to MT-safe functions in libc/stdio in preparation for adding a mutex to FILE. We have recursive mutexes, but would like to avoid using them if possible. Remove uneeded includes of <errno.h> from a few files. Add $FreeBSD$ to a few files in order to pass commitprep. Approved by: -arch
2001-01-24 13:01:12 +00:00
if (__isthreaded)
Since jb@ fixed the type of dd_lock in <dirent.h>, these casts are no longer required.
2007-12-03 14:33:51 +00:00
_pthread_mutex_lock(&dirp->dd_lock);
If telldir() is called immediately after a call to seekdir(), POSIX requires the return value of telldir() to equal the value passed to seekdir(). The current seekdir code with SINGLEUSE enabled breaks this case as each call to telldir() allocates a new cookie. Instead, remove the SINGLEUSE code and change telldir() to look for an existing cookie for the directory's current location rather than always creating a new cookie. CR: https://phabric.freebsd.org/D490 PR: 121656 Reviewed by: jilles MFC after: 1 week
2014-07-29 00:16:33 +00:00
LIST_FOREACH(lp, &dirp->dd_td->td_locq, loc_lqe) {
if (lp->loc_seek == dirp->dd_seek &&
lp->loc_loc == dirp->dd_loc)
break;
}
if (lp == NULL) {
lp = malloc(sizeof(struct ddloc));
if (lp == NULL) {
if (__isthreaded)
_pthread_mutex_unlock(&dirp->dd_lock);
return (-1);
}
lp->loc_index = dirp->dd_td->td_loccnt++;
lp->loc_seek = dirp->dd_seek;
lp->loc_loc = dirp->dd_loc;
LIST_INSERT_HEAD(&dirp->dd_td->td_locq, lp, loc_lqe);
}
idx = lp->loc_index;
Remove _THREAD_SAFE and make libc thread-safe by default by adding (weak definitions to) stubs for some of the pthread functions. If the threads library is linked in, the real pthread functions will pulled in. Use the following convention for system calls wrapped by the threads library: __sys_foo - actual system call _foo - weak definition to __sys_foo foo - weak definition to __sys_foo Change all libc uses of system calls wrapped by the threads library from foo to _foo. In order to define the prototypes for _foo(), we introduce namespace.h and un-namespace.h (suggested by bde). All files that need to reference these system calls, should include namespace.h before any standard includes, then include un-namespace.h after the standard includes and before any local includes. <db.h> is an exception and shouldn't be included in between namespace.h and un-namespace.h namespace.h will define foo to _foo, and un-namespace.h will undefine foo. Try to eliminate some of the recursive calls to MT-safe functions in libc/stdio in preparation for adding a mutex to FILE. We have recursive mutexes, but would like to avoid using them if possible. Remove uneeded includes of <errno.h> from a few files. Add $FreeBSD$ to a few files in order to pass commitprep. Approved by: -arch
2001-01-24 13:01:12 +00:00
if (__isthreaded)
Since jb@ fixed the type of dd_lock in <dirent.h>, these casts are no longer required.
2007-12-03 14:33:51 +00:00
_pthread_mutex_unlock(&dirp->dd_lock);
If telldir() is called immediately after a call to seekdir(), POSIX requires the return value of telldir() to equal the value passed to seekdir(). The current seekdir code with SINGLEUSE enabled breaks this case as each call to telldir() allocates a new cookie. Instead, remove the SINGLEUSE code and change telldir() to look for an existing cookie for the directory's current location rather than always creating a new cookie. CR: https://phabric.freebsd.org/D490 PR: 121656 Reviewed by: jilles MFC after: 1 week
2014-07-29 00:16:33 +00:00
return (idx);
BSD 4.4 Lite Lib Sources
1994-05-27 05:00:24 +00:00
}
/*
* seek to an entry in a directory.
* Only values returned by "telldir" should be passed to seekdir.
*/
void
Use ANSI C prototypes. Eliminates -Wold-style-definition warnings.
2015-09-20 20:23:16 +00:00
_seekdir(DIR *dirp, long loc)
BSD 4.4 Lite Lib Sources
1994-05-27 05:00:24 +00:00
{
Move telldir position recording type definitions and prototypes to "telldir.h" in order to prevent namespace pollution in <dirent.h> (which was including <sys/queue.h>). Add $FreeBSD$ to rewinddir.c and seekdir.c.
2000-12-11 04:00:36 +00:00
struct ddloc *lp;
BSD 4.4 Lite Lib Sources
1994-05-27 05:00:24 +00:00
struct dirent *dp;
Move telldir position recording type definitions and prototypes to "telldir.h" in order to prevent namespace pollution in <dirent.h> (which was including <sys/queue.h>). Add $FreeBSD$ to rewinddir.c and seekdir.c.
2000-12-11 04:00:36 +00:00
LIST_FOREACH(lp, &dirp->dd_td->td_locq, loc_lqe) {
BSD 4.4 Lite Lib Sources
1994-05-27 05:00:24 +00:00
if (lp->loc_index == loc)
break;
}
if (lp == NULL)
return;
if (lp->loc_loc == dirp->dd_loc && lp->loc_seek == dirp->dd_seek)
If telldir() is called immediately after a call to seekdir(), POSIX requires the return value of telldir() to equal the value passed to seekdir(). The current seekdir code with SINGLEUSE enabled breaks this case as each call to telldir() allocates a new cookie. Instead, remove the SINGLEUSE code and change telldir() to look for an existing cookie for the directory's current location rather than always creating a new cookie. CR: https://phabric.freebsd.org/D490 PR: 121656 Reviewed by: jilles MFC after: 1 week
2014-07-29 00:16:33 +00:00
return;
A few style fixes and expand the comment a bit on what _fixtelldir() is doing.
2015-05-06 15:25:20 +00:00
/* If it's within the same chunk of data, don't bother reloading. */
Tweak seekdir, telldir and readdir so that when htere are deletes going on, 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
2015-05-05 14:52:33 +00:00
if (lp->loc_seek == dirp->dd_seek) {
/*
* If we go back to 0 don't make the next readdir
A few style fixes and expand the comment a bit on what _fixtelldir() is doing.
2015-05-06 15:25:20 +00:00
* trigger a call to getdirentries().
Tweak seekdir, telldir and readdir so that when htere are deletes going on, 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
2015-05-05 14:52:33 +00:00
*/
if (lp->loc_loc == 0)
dirp->dd_flags |= __DTF_SKIPREAD;
dirp->dd_loc = lp->loc_loc;
return;
}
BSD 4.4 Lite Lib Sources
1994-05-27 05:00:24 +00:00
(void) lseek(dirp->dd_fd, (off_t)lp->loc_seek, SEEK_SET);
dirp->dd_seek = lp->loc_seek;
dirp->dd_loc = 0;
Tweak seekdir, telldir and readdir so that when htere are deletes going on, 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
2015-05-05 14:52:33 +00:00
dirp->dd_flags &= ~__DTF_SKIPREAD; /* current contents are invalid */
BSD 4.4 Lite Lib Sources
1994-05-27 05:00:24 +00:00
while (dirp->dd_loc < lp->loc_loc) {
Do not read away the target directory entry when encountering deleted files after a seekdir(). The seekdir shall set the position for the next readdir operation. When the _readdir_unlocked() encounters deleted entry, dd_loc is already advanced. Continuing the loop leads to premature read of the target entry. Submitted by: Marc Balmer <mbalmer at openbsd org> Obtained from: OpenBSD MFC after: 2 weeks
2008-05-05 14:05:23 +00:00
dp = _readdir_unlocked(dirp, 0);
BSD 4.4 Lite Lib Sources
1994-05-27 05:00:24 +00:00
if (dp == NULL)
break;
}
}
Reclaim memory used for telldir cookies on closedir.
1995-01-27 13:51:18 +00:00
Tweak seekdir, telldir and readdir so that when htere are deletes going on, 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
2015-05-05 14:52:33 +00:00
/*
Tweak the comment here some more. In particular, the previous opening sentence was a bit confusing. Noted by: kib
2015-05-06 17:23:42 +00:00
* After readdir returns the last entry in a block, a call to telldir
* returns a location that is after the end of that last entry.
* However, that location doesn't refer to a valid directory entry.
* Ideally, the call to telldir would return a location that refers to
* the first entry in the next block. That location is not known
* until the next block is read, so readdir calls this function after
* fetching a new block to fix any such telldir locations.
Tweak seekdir, telldir and readdir so that when htere are deletes going on, 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
2015-05-05 14:52:33 +00:00
*/
void
_fixtelldir(DIR *dirp, long oldseek, long oldloc)
{
struct ddloc *lp;
lp = LIST_FIRST(&dirp->dd_td->td_locq);
if (lp != NULL) {
if (lp->loc_loc == oldloc &&
lp->loc_seek == oldseek) {
lp->loc_seek = dirp->dd_seek;
lp->loc_loc = dirp->dd_loc;
}
}
}
Reclaim memory used for telldir cookies on closedir.
1995-01-27 13:51:18 +00:00
/*
* Reclaim memory for telldir cookies which weren't used.
*/
void
Use ANSI C prototypes. Eliminates -Wold-style-definition warnings.
2015-09-20 20:23:16 +00:00
_reclaim_telldir(DIR *dirp)
Reclaim memory used for telldir cookies on closedir.
1995-01-27 13:51:18 +00:00
{
Move telldir position recording type definitions and prototypes to "telldir.h" in order to prevent namespace pollution in <dirent.h> (which was including <sys/queue.h>). Add $FreeBSD$ to rewinddir.c and seekdir.c.
2000-12-11 04:00:36 +00:00
struct ddloc *lp;
struct ddloc *templp;
Reclaim memory used for telldir cookies on closedir.
1995-01-27 13:51:18 +00:00
Move telldir position recording type definitions and prototypes to "telldir.h" in order to prevent namespace pollution in <dirent.h> (which was including <sys/queue.h>). Add $FreeBSD$ to rewinddir.c and seekdir.c.
2000-12-11 04:00:36 +00:00
lp = LIST_FIRST(&dirp->dd_td->td_locq);
Cleanup XXXdir functions to eliminate global hash table of telldir positions. This will allow (future) locking on a per-DIR basis (for MT-safety). For now, this change does the following: o Remove the hash table from telldir.c. Recode to use queue macros. o Remove 'const' from 'telldir(const DIR *)'. o Remove 'register' variables as suggested in a recent thread. No response from: -current
2000-12-06 03:15:49 +00:00
while (lp != NULL) {
templp = lp;
lp = LIST_NEXT(lp, loc_lqe);
free(templp);
Reclaim memory used for telldir cookies on closedir.
1995-01-27 13:51:18 +00:00
}
Move telldir position recording type definitions and prototypes to "telldir.h" in order to prevent namespace pollution in <dirent.h> (which was including <sys/queue.h>). Add $FreeBSD$ to rewinddir.c and seekdir.c.
2000-12-11 04:00:36 +00:00
LIST_INIT(&dirp->dd_td->td_locq);
Reclaim memory used for telldir cookies on closedir.
1995-01-27 13:51:18 +00:00
}
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