File

Underlying type of a file descriptor. More...

Data Structures
struct	file_t
	File structure. More...
struct	file_ops_t
	File operations structure. More...
struct	poll_file_t
	Structure for polling multiple files. More...

Functions
file_t *	file_new (inode_t *inode, const path_t *path, path_flags_t flags)
	Create a new file structure.
uint64_t	file_generic_seek (file_t *file, int64_t offset, seek_origin_t origin)
	Helper function for basic seeking.

Detailed Description

Underlying type of a file descriptor.

A file is the underlying type of a file descriptor. Note that internally the kernel does not use file descriptors, they are simply a per-process handle to a file. The kernel uses files directly.

Function Documentation

file_generic_seek()

uint64_t file_generic_seek	(	file_t *	file,
		int64_t	offset,
		seek_origin_t	origin
	)

Helper function for basic seeking.

This can be used by filesystems that do not have any special requirements for seeking.

Used by setting the file ops seek to this function.

Definition at line 51 of file file.c.

References EINVAL, ERR, errno, file, dentry_t::inode, inode_t::mutex, MUTEX_SCOPE, SEEK_CUR, SEEK_END, SEEK_SET, and inode_t::size.

file_new()

file_t * file_new	(	inode_t *	inode,
		const path_t *	path,
		path_flags_t	flags
	)

Create a new file structure.

This does not open the file, instead its used internally by the VFS when opening files.

There is no file_free() instead use DEREF().

Parameters

inode	The inode the file represents.
path	The path of the file.
flags	The flags for the file.

Returns

On success, the new file. On failure, returns NULL and errno is set.

Definition at line 31 of file file.c.

References file, file_free(), inode_t::fileOps, dentry_t::inode, malloc(), NULL, dentry_t::ops, path_copy(), PATH_EMPTY, dentry_t::private, dentry_t::ref, REF, and ref_init().

Referenced by vfs_open(), and vfs_open2().