d/freebsd-dev
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
3c1493dcbd
freebsd-dev/lib/libc/gen/readdir.c

135 lines
3.9 KiB
C
Raw Normal View History

Import CSRG 4.4BSD-Lite2 lib/libc onto vendor branch
1997-03-11 11:29:42 +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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* 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[] = "@(#)readdir.c 8.3 (Berkeley) 9/29/94";
#endif /* LIBC_SCCS and not lint */
Fix SCM ID's.
2002-02-01 00:57:29 +00:00
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
Import CSRG 4.4BSD-Lite2 lib/libc onto vendor branch
1997-03-11 11:29:42 +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"
Import CSRG 4.4BSD-Lite2 lib/libc onto vendor branch
1997-03-11 11:29:42 +00:00
#include <sys/param.h>
#include <dirent.h>
add pthread_cancel, obtained from OpenBSD. eischen (Daniel Eischen) added wrappers to protect against cancled threads orphaning internal resources. the cancelability code is still a bit fuzzy but works for test programs of my own, OpenBSD's and some examples from ORA's books. add readdir_r to both libc and libc_r add some 'const' attributes to function parameters Reviewed by: eischen, jasone
1999-11-28 05:38:13 +00:00
#include <errno.h>
#include <string.h> for memcpy() prototype Obtained from: OpenBSD
2000-06-03 00:27:54 +00:00
#include <string.h>
add pthread_cancel, obtained from OpenBSD. eischen (Daniel Eischen) added wrappers to protect against cancled threads orphaning internal resources. the cancelability code is still a bit fuzzy but works for test programs of my own, OpenBSD's and some examples from ORA's books. add readdir_r to both libc and libc_r add some 'const' attributes to function parameters Reviewed by: eischen, jasone
1999-11-28 05:38:13 +00:00
#include <pthread.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"
#include "libc_private.h"
Import CSRG 4.4BSD-Lite2 lib/libc onto vendor branch
1997-03-11 11:29:42 +00:00
/*
* get next entry in a directory.
*/
struct dirent *
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
_readdir_unlocked(dirp)
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
DIR *dirp;
Import CSRG 4.4BSD-Lite2 lib/libc onto vendor branch
1997-03-11 11:29:42 +00:00
{
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
struct dirent *dp;
Import CSRG 4.4BSD-Lite2 lib/libc onto vendor branch
1997-03-11 11:29:42 +00:00
for (;;) {
if (dirp->dd_loc >= dirp->dd_size) {
if (dirp->dd_flags & __DTF_READALL)
return (NULL);
dirp->dd_loc = 0;
}
if (dirp->dd_loc == 0 && !(dirp->dd_flags & __DTF_READALL)) {
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
dirp->dd_size = _getdirentries(dirp->dd_fd,
Import CSRG 4.4BSD-Lite2 lib/libc onto vendor branch
1997-03-11 11:29:42 +00:00
dirp->dd_buf, dirp->dd_len, &dirp->dd_seek);
if (dirp->dd_size <= 0)
return (NULL);
}
dp = (struct dirent *)(dirp->dd_buf + dirp->dd_loc);
Fix a bogus cast for a bogus pointer check. This only checks if the pointer is 4-byte aligned. On a 64-bit machine it probably should check that the pointer is 8-byte aligned (eh, Bruce?) 8-)
1998-02-20 08:00:01 +00:00
if ((long)dp & 03L) /* bogus pointer check */
Import CSRG 4.4BSD-Lite2 lib/libc onto vendor branch
1997-03-11 11:29:42 +00:00
return (NULL);
if (dp->d_reclen <= 0 ||
dp->d_reclen > dirp->dd_len + 1 - dirp->dd_loc)
return (NULL);
dirp->dd_loc += dp->d_reclen;
if (dp->d_ino == 0)
continue;
if (dp->d_type == DT_WHT && (dirp->dd_flags & DTF_HIDEW))
continue;
return (dp);
}
}
add pthread_cancel, obtained from OpenBSD. eischen (Daniel Eischen) added wrappers to protect against cancled threads orphaning internal resources. the cancelability code is still a bit fuzzy but works for test programs of my own, OpenBSD's and some examples from ORA's books. add readdir_r to both libc and libc_r add some 'const' attributes to function parameters Reviewed by: eischen, jasone
1999-11-28 05:38:13 +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
struct dirent *
readdir(dirp)
DIR *dirp;
{
struct dirent *dp;
if (__isthreaded) {
_pthread_mutex_lock((pthread_mutex_t *)&dirp->dd_lock);
dp = _readdir_unlocked(dirp);
_pthread_mutex_unlock((pthread_mutex_t *)&dirp->dd_lock);
}
else
dp = _readdir_unlocked(dirp);
return (dp);
}
add pthread_cancel, obtained from OpenBSD. eischen (Daniel Eischen) added wrappers to protect against cancled threads orphaning internal resources. the cancelability code is still a bit fuzzy but works for test programs of my own, OpenBSD's and some examples from ORA's books. add readdir_r to both libc and libc_r add some 'const' attributes to function parameters Reviewed by: eischen, jasone
1999-11-28 05:38:13 +00:00
int
readdir_r(dirp, entry, result)
DIR *dirp;
struct dirent *entry;
struct dirent **result;
{
struct dirent *dp;
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
int saved_errno;
style fixes, remove extra braces. readdir_r is not POSIX according to POSIX_SOURCE, bruce says: > readdir_r() is in the _POSIX_SOURCE section, but is not a POSIX.1-1990 > function. It's POSIX.1-1996 so it should be under a different feature > test which we don't support yet. make sure errno is saved so that its contents are cleared unless necessary. Submitted by: bde
1999-11-29 19:12:50 +00:00
saved_errno = errno;
add pthread_cancel, obtained from OpenBSD. eischen (Daniel Eischen) added wrappers to protect against cancled threads orphaning internal resources. the cancelability code is still a bit fuzzy but works for test programs of my own, OpenBSD's and some examples from ORA's books. add readdir_r to both libc and libc_r add some 'const' attributes to function parameters Reviewed by: eischen, jasone
1999-11-28 05:38:13 +00:00
errno = 0;
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) {
_pthread_mutex_lock((pthread_mutex_t *)&dirp->dd_lock);
if ((dp = _readdir_unlocked(dirp)) != NULL)
use _GENERIC_DIRSIZ(dp) to avoid copying too much of the dirent over the user supplied buffer. this can be a problem when the user doesn't supply a full dirent and we corrupt their memory.
2002-02-26 21:39:32 +00:00
memcpy(entry, dp, _GENERIC_DIRSIZ(dp));
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
_pthread_mutex_unlock((pthread_mutex_t *)&dirp->dd_lock);
}
else if ((dp = _readdir_unlocked(dirp)) != NULL)
use _GENERIC_DIRSIZ(dp) to avoid copying too much of the dirent over the user supplied buffer. this can be a problem when the user doesn't supply a full dirent and we corrupt their memory.
2002-02-26 21:39:32 +00:00
memcpy(entry, dp, _GENERIC_DIRSIZ(dp));
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
style fixes, remove extra braces. readdir_r is not POSIX according to POSIX_SOURCE, bruce says: > readdir_r() is in the _POSIX_SOURCE section, but is not a POSIX.1-1990 > function. It's POSIX.1-1996 so it should be under a different feature > test which we don't support yet. make sure errno is saved so that its contents are cleared unless necessary. Submitted by: bde
1999-11-29 19:12:50 +00:00
if (errno != 0) {
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 (dp == NULL)
style fixes, remove extra braces. readdir_r is not POSIX according to POSIX_SOURCE, bruce says: > readdir_r() is in the _POSIX_SOURCE section, but is not a POSIX.1-1990 > function. It's POSIX.1-1996 so it should be under a different feature > test which we don't support yet. make sure errno is saved so that its contents are cleared unless necessary. Submitted by: bde
1999-11-29 19:12:50 +00:00
return (errno);
} else
errno = saved_errno;
if (dp != NULL)
Provide a man page for Alfreds lovely readdir_r function. Also fixed a minor indentation nit and added a few {}s to make readdir_r easier on old eyes.
1999-11-29 06:12:22 +00:00
*result = entry;
style fixes, remove extra braces. readdir_r is not POSIX according to POSIX_SOURCE, bruce says: > readdir_r() is in the _POSIX_SOURCE section, but is not a POSIX.1-1990 > function. It's POSIX.1-1996 so it should be under a different feature > test which we don't support yet. make sure errno is saved so that its contents are cleared unless necessary. Submitted by: bde
1999-11-29 19:12:50 +00:00
else
add pthread_cancel, obtained from OpenBSD. eischen (Daniel Eischen) added wrappers to protect against cancled threads orphaning internal resources. the cancelability code is still a bit fuzzy but works for test programs of my own, OpenBSD's and some examples from ORA's books. add readdir_r to both libc and libc_r add some 'const' attributes to function parameters Reviewed by: eischen, jasone
1999-11-28 05:38:13 +00:00
*result = NULL;
style fixes, remove extra braces. readdir_r is not POSIX according to POSIX_SOURCE, bruce says: > readdir_r() is in the _POSIX_SOURCE section, but is not a POSIX.1-1990 > function. It's POSIX.1-1996 so it should be under a different feature > test which we don't support yet. make sure errno is saved so that its contents are cleared unless necessary. Submitted by: bde
1999-11-29 19:12:50 +00:00
return (0);
add pthread_cancel, obtained from OpenBSD. eischen (Daniel Eischen) added wrappers to protect against cancled threads orphaning internal resources. the cancelability code is still a bit fuzzy but works for test programs of my own, OpenBSD's and some examples from ORA's books. add readdir_r to both libc and libc_r add some 'const' attributes to function parameters Reviewed by: eischen, jasone
1999-11-28 05:38:13 +00:00
}
Reference in New Issue Copy Permalink