L4Re::Vfs::Fs Class Reference

POSIX File-system related functionality. More...

#include <vfs.h>

Inheritance diagram for L4Re::Vfs::Fs:

Collaboration diagram for L4Re::Vfs::Fs:

Public Member Functions
virtual cxx::Ref_ptr< File >	get_file (int fd) noexcept=0
	Get the L4Re::Vfs::File for the file descriptor fd.
virtual cxx::Ref_ptr< File >	get_root () noexcept=0
	Get the directory object for the application's root directory.
virtual cxx::Ref_ptr< File >	get_cwd () noexcept
	Get the directory object for the application's current working directory.
virtual void	set_cwd (cxx::Ref_ptr< File > const &) noexcept
	Set the current working directory for the application.
virtual int	alloc_fd (cxx::Ref_ptr< File > const &f=cxx::Ref_ptr<>::Nil) noexcept=0
	Allocate the next free file descriptor.
virtual cxx::Pair< cxx::Ref_ptr< File >, int >	set_fd (int fd, cxx::Ref_ptr< File > const &f=cxx::Ref_ptr<>::Nil) noexcept=0
	Set the file object referenced by the file descriptor fd.
virtual cxx::Ref_ptr< File >	free_fd (int fd) noexcept=0
	Free the file descriptor fd.
virtual int	mount (char const *path, cxx::Ref_ptr< File > const &dir) noexcept=0
	Mount a given file object at the given global path in the VFS.
int	mount (char const *source, char const *target, char const *fstype, unsigned long mountflags, void const *data) noexcept
	Backend for the POSIX mount call.

Detailed Description

POSIX File-system related functionality.

Note

This class usually exists as a singleton and as a superclass of L4Re::Vfs::Ops (

See also

L4Re::Vfs::vfs_ops).

Definition at line 946 of file vfs.h.

Member Function Documentation

alloc_fd()

virtual int L4Re::Vfs::Fs::alloc_fd ( cxx::Ref_ptr< File > const & f = cxx::Ref_ptr<>::Nil )

pure virtualnoexcept

Allocate the next free file descriptor.

Parameters

f	The file to assign to that file descriptor.

Returns

The allocated file descriptor, or -EMFILE on error.

free_fd()

virtual cxx::Ref_ptr< File > L4Re::Vfs::Fs::free_fd ( int fd )

pure virtualnoexcept

Free the file descriptor fd.

Parameters

fd	The file descriptor to free.

Returns

A pointer to the file object that was assigned to the fd.

get_file()

virtual cxx::Ref_ptr< File > L4Re::Vfs::Fs::get_file ( int fd )

pure virtualnoexcept

Get the L4Re::Vfs::File for the file descriptor fd.

Parameters

fd	The POSIX file descriptor number.

Returns

A pointer to the File object, or 0 if fd is not open.

mount()

virtual int L4Re::Vfs::Fs::mount ( char const * path, cxx::Ref_ptr< File > const & dir )

pure virtualnoexcept

Mount a given file object at the given global path in the VFS.

Parameters

path	The global path to mount dir at.
dir	A pointer to the file/directory object that shall be mounted at path.

Returns

0 on success, or <0 on error.

References mount().

Referenced by mount(), and mount().

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set_fd()

virtual cxx::Pair< cxx::Ref_ptr< File >, int > L4Re::Vfs::Fs::set_fd ( int fd, cxx::Ref_ptr< File > const & f = cxx::Ref_ptr<>::Nil )

pure virtualnoexcept

Set the file object referenced by the file descriptor fd.

Parameters

fd	The file descriptor to set to f.
f	The file object to assign.

Returns

A pair of a pointer to the file object that was previously assigned to fd (first) and a return value (second). second contains -#EBADF if the passed file descriptor is outside the valid range. first contains a Nil pointer in that case. On success, second contains 0.

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The documentation for this class was generated from the following files:

• l4/l4re_vfs/vfs.h
• l4/l4re_vfs/impl/vfs_impl.h