dirent: Use an actual flexible-length array for d_name.

GCC 11 treats [1] as a fixed-length array and not a flexible-length
array, and so some things that used direct strcmp("..", ent->d_name),
for instance, would be optimized out as being always unequal,
which was the cause of #17389. Using a real FLA informs GCC that
there is going to be more than one byte of data, and thus this
fixes that bug.

BeOS used [1] and not [0], possibly because it had to deal with
compilers (MetroWerks? Early GCC2?) that did not support FLAs.
GCC 2.95 does, using [0], and GCC 4 does, using [], so we can go
with that here.

(I did try using [0] for both, which seems to be OK with GCC 11,
but GCC 8 throws errors when d_name is dereferenced directly
as being-out-of-bounds. So, we have to use the #if here and give
newer GCC the [] syntax and not [0] to avoid that problem.)

The real question probably is whether or not we should backport
some variant of these changes to R1/beta3, as software at HaikuPorts
very well may run in to the same issue. (The alternative workaround
is to compile with -O1 and not -O2 for any affected software.) But
maybe this is an argument for keeping with the beta4 schedule of
this coming January...

Updated copyright in headers. No functional change.

changed dirfd() to its POSIX signature, without const (see #4947).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@40137 a95241bf-73f2-0310-859d-f6bbb57e9c96

Updated posix headers to remove commas from copyright line, to match the preferred coding guidelines.
Cleaned up some header style violations, making sure there are two blank lines after the header guards.
This fixes the posix header part of #2191.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@39288 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Accidently moved the fdopendir() prototype around.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34839 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Implemented missing alphasort(), and scandir() POSIX functions. Completely
untested yet, though.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34838 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Added fdopendir() (POSIX).
* Got rid of <dirent_private.h> -- the __DIR structure is private to dirent.c,
now. The attribute directory, index directory, and query functions use the
the public POSIX API, so does the kernel module code. Those components were
not initializing the structure correctly anymore since the introduction of
telldir()/seekdir().

+alphabranch


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@32819 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Build fix: coreutils had a replacement for dirfd().
* Made DIR argument const in dirfd().


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26469 a95241bf-73f2-0310-859d-f6bbb57e9c96

Make dirfd() publically available. It used on other systems as well it seems.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26466 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Made DIR definition private, and moved it into the new dirent_private.h
header.
* Added fields necessary to make it possible to retrieve more than one
dirent from the underlying file system.
* Unless some app creates a DIR on its own to it to feed readdir(), this
change should be binary compatible. If we find an application misbehaving,
we can still make it a GCC4 only thing.
* fs_attr/fs_index/fs_query now all use readdir() directly (as that one
contains the logic to iterate through a number of dirents in userspace).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26339 a95241bf-73f2-0310-859d-f6bbb57e9c96

added two missing functions : seekdir and telldir


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@14699 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added readdir_r() function prototype. Minor cleanup.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@8957 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added comments to the fields of the dirent structure. Most important one
is d_reclen which points out that this field is not the name length but
the one of the whole record (this is also handled incorrectly by the kernel
file systems right now).


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@2109 a95241bf-73f2-0310-859d-f6bbb57e9c96

fixed the extern "C" header guards, it must read __cplusplus, not _cplusplus.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@1679 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added a preliminary sys/types.h that just includes ktypes.h for now.
Changed other headers to include sys/types.h rather than ktypes.h.
Added a license reference at the beginning of those files.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@840 a95241bf-73f2-0310-859d-f6bbb57e9c96

Big commit: Added symlink support to the kernel.
- added needed syscalls to access symlink support from userland
- implemented lstat(), symlink(), and readlink()
- added dev_t to ktypes.h (for now - should be in a public header anyway)
- added symlink support to the "ls" command (now calls lstat() and shows the
link target with the -l option)
- changed the sys_read_stat() call to support symlinks, and updated files
using that function (it gets an extra argument: bool traverseLink)


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@560 a95241bf-73f2-0310-859d-f6bbb57e9c96

This is where it belongs!


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@83 a95241bf-73f2-0310-859d-f6bbb57e9c96

Updated copyright in headers. No functional change.

changed dirfd() to its POSIX signature, without const (see #4947).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@40137 a95241bf-73f2-0310-859d-f6bbb57e9c96

Updated posix headers to remove commas from copyright line, to match the preferred coding guidelines.
Cleaned up some header style violations, making sure there are two blank lines after the header guards.
This fixes the posix header part of #2191.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@39288 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Accidently moved the fdopendir() prototype around.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34839 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Implemented missing alphasort(), and scandir() POSIX functions. Completely
untested yet, though.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34838 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Added fdopendir() (POSIX).
* Got rid of <dirent_private.h> -- the __DIR structure is private to dirent.c,
now. The attribute directory, index directory, and query functions use the
the public POSIX API, so does the kernel module code. Those components were
not initializing the structure correctly anymore since the introduction of
telldir()/seekdir().

+alphabranch


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@32819 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Build fix: coreutils had a replacement for dirfd().
* Made DIR argument const in dirfd().


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26469 a95241bf-73f2-0310-859d-f6bbb57e9c96

Make dirfd() publically available. It used on other systems as well it seems.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26466 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Made DIR definition private, and moved it into the new dirent_private.h
header.
* Added fields necessary to make it possible to retrieve more than one
dirent from the underlying file system.
* Unless some app creates a DIR on its own to it to feed readdir(), this
change should be binary compatible. If we find an application misbehaving,
we can still make it a GCC4 only thing.
* fs_attr/fs_index/fs_query now all use readdir() directly (as that one
contains the logic to iterate through a number of dirents in userspace).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26339 a95241bf-73f2-0310-859d-f6bbb57e9c96

added two missing functions : seekdir and telldir


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@14699 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added readdir_r() function prototype. Minor cleanup.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@8957 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added comments to the fields of the dirent structure. Most important one
is d_reclen which points out that this field is not the name length but
the one of the whole record (this is also handled incorrectly by the kernel
file systems right now).


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@2109 a95241bf-73f2-0310-859d-f6bbb57e9c96

fixed the extern "C" header guards, it must read __cplusplus, not _cplusplus.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@1679 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added a preliminary sys/types.h that just includes ktypes.h for now.
Changed other headers to include sys/types.h rather than ktypes.h.
Added a license reference at the beginning of those files.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@840 a95241bf-73f2-0310-859d-f6bbb57e9c96

Big commit: Added symlink support to the kernel.
- added needed syscalls to access symlink support from userland
- implemented lstat(), symlink(), and readlink()
- added dev_t to ktypes.h (for now - should be in a public header anyway)
- added symlink support to the "ls" command (now calls lstat() and shows the
link target with the -l option)
- changed the sys_read_stat() call to support symlinks, and updated files
using that function (it gets an extra argument: bool traverseLink)


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@560 a95241bf-73f2-0310-859d-f6bbb57e9c96

This is where it belongs!


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@83 a95241bf-73f2-0310-859d-f6bbb57e9c96