libroot_build: Fix issues with attribute FD for symlink

AttributeDescriptor: Don't use dup() directly. Check, if the given FD is
one we track and clone it respectively. This allows use with symlink FDs
which we have to fake on Linux (since symlinks cannot be opened). Fixes
extraction of packages containing symlinks with attributes.

Add helper is_unknown_or_system_descriptor()

Open/close attribute support for xattrs backend

For the xattr/BSD (untyped) attribute backend implement fs_fopen_attr()
and fs_close_attr(). A new AttributeDescriptor is created. It is
currently used in write_pos() only.

Add helper is_unknown_or_system_descriptor()

Open/close attribute support for xattrs backend

For the xattr/BSD (untyped) attribute backend implement fs_fopen_attr()
and fs_close_attr(). A new AttributeDescriptor is created. It is
currently used in write_pos() only.

Prefer NULL over 0 and not need to initialize globals with zero as pointed
out by Axel.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26610 a95241bf-73f2-0310-859d-f6bbb57e9c96

julun+mauricek:
* rc uses a global instance of BResources. On destruction it calls Unset() of the BFile member fFile. BNode::Unset then calls close_fd(), which parses the static global DescriptorMap to actually close the descriptor. However on Cygwin the DescriptorMap has been destroyed already for some reason, thus accessing it is invalid. The "fix" is to put the map on the heap and delete it as soon as it gets empty. This way the global BResources instance can be freed without a crash.
* If someone likes to review, feel free to, it didn't cause any issues here


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26585 a95241bf-73f2-0310-859d-f6bbb57e9c96

Under Linux it is now possible to emulate the BeOS attribute support via
xattrs. It can be enabled with the configure switch "--use-xattr". Note
that the amount of data stored in attributes may be limited by the used
file system -- e.g. AFAIK ext3 has a limit of one block (usually 4 KB)
for all attributes of a file, which might not suffice. XFS should be
fine, as should ReiserFS 3.6 (or any FS which stores attributes in
hidden files).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@20609 a95241bf-73f2-0310-859d-f6bbb57e9c96

libroot_build.so:
* Reorganized sources a bit:
- The descriptor support is in a separate file now.
- Disentangled the attribute support from the other stuff.
* Removed broken xattr use for attribute support.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@20606 a95241bf-73f2-0310-859d-f6bbb57e9c96

libroot_build: Fix issues with attribute FD for symlink

AttributeDescriptor: Don't use dup() directly. Check, if the given FD is
one we track and clone it respectively. This allows use with symlink FDs
which we have to fake on Linux (since symlinks cannot be opened). Fixes
extraction of packages containing symlinks with attributes.

Add helper is_unknown_or_system_descriptor()

Open/close attribute support for xattrs backend

For the xattr/BSD (untyped) attribute backend implement fs_fopen_attr()
and fs_close_attr(). A new AttributeDescriptor is created. It is
currently used in write_pos() only.

Add helper is_unknown_or_system_descriptor()

Open/close attribute support for xattrs backend

For the xattr/BSD (untyped) attribute backend implement fs_fopen_attr()
and fs_close_attr(). A new AttributeDescriptor is created. It is
currently used in write_pos() only.

Prefer NULL over 0 and not need to initialize globals with zero as pointed
out by Axel.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26610 a95241bf-73f2-0310-859d-f6bbb57e9c96

julun+mauricek:
* rc uses a global instance of BResources. On destruction it calls Unset() of the BFile member fFile. BNode::Unset then calls close_fd(), which parses the static global DescriptorMap to actually close the descriptor. However on Cygwin the DescriptorMap has been destroyed already for some reason, thus accessing it is invalid. The "fix" is to put the map on the heap and delete it as soon as it gets empty. This way the global BResources instance can be freed without a crash.
* If someone likes to review, feel free to, it didn't cause any issues here


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26585 a95241bf-73f2-0310-859d-f6bbb57e9c96

Under Linux it is now possible to emulate the BeOS attribute support via
xattrs. It can be enabled with the configure switch "--use-xattr". Note
that the amount of data stored in attributes may be limited by the used
file system -- e.g. AFAIK ext3 has a limit of one block (usually 4 KB)
for all attributes of a file, which might not suffice. XFS should be
fine, as should ReiserFS 3.6 (or any FS which stores attributes in
hidden files).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@20609 a95241bf-73f2-0310-859d-f6bbb57e9c96

libroot_build.so:
* Reorganized sources a bit:
- The descriptor support is in a separate file now.
- Disentangled the attribute support from the other stuff.
* Removed broken xattr use for attribute support.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@20606 a95241bf-73f2-0310-859d-f6bbb57e9c96