Functions that manage memory mappping.

This header provides the meomry map functions mmap and munmap. More...

Functions
void *	mmap (void *addr, size_t len, int prot, int flags, int fd, off_t offset)
	Creates or opens a named or unnamed file mapping object for a specified file and maps a view of a file mapping into the address space of a calling process. More...
int	munmap (void *addr, size_t len)
	Unmaps a mapped view of a file from the calling process's address space. More...
int	mprotect (void *addr, size_t len, int prot)
	Changes protection for the calling process' address. More...

Detailed Description

This header provides the meomry map functions mmap and munmap.

Function Documentation

mmap()

void* mmap	(	void *	addr,
		size_t	len,
		int	prot,
		int	flags,
		int	fd,
		off_t	offset
	)

Creates or opens a named or unnamed file mapping object for a specified file and maps a view of a file mapping into the address space of a calling process.

Parameters

addr	Unused
len	Number of bytes to be mapped.
prot	Protections.
flags	Type of the mapped object.
fd	File descriptor that describes the object to map.
offset	Number of bytes from which to start the mapping.

Returns

The starting address of the mapped view on success, -1 otherwise.

Create or open an unnamed file mapping object for a specified file described by the file descriptor fd. The number of bytes that are mapped is given by len and start after offset bytes. The parameter addr is unused.

The only type of the mapped object that is supported is MAP_SHARED. If another value if given, -1 is returned.

prot specifies the protection of the mapped region. If PROT_EXEC is used, it set the execute access. If PROT_READ is used, it sets the read access. If PROT_WRITE is used, it sets the write access.

If the map view of file can not be created, -1 is returned. If the mappping can not be done, -1 is returned.

If no error occurred, the starting address of the mapped view is returned.

Conformity: None.

Supported OS: Windows Vista, Windows XP or Windows 2000 Professional.

Referenced by ecore_drm2_fb_create(), eina_file_map_all(), and eina_file_map_new().

munmap()

int munmap	(	void *	addr,
		size_t	len
	)

Unmaps a mapped view of a file from the calling process's address space.

Parameters

addr	Pointer to the base address.
len	Unused.

Returns

0 on success, -1 otherwise.

Unmaps a mapped view of a file from the calling process's address space. addr is the pointer to the base address. This value must be identical to the value returned by a previous call to mmap(). The parameter len is unused.

Conformity: None.

Supported OS: Windows Vista, Windows XP or Windows 2000 Professional.

Referenced by eina_file_map_free().

mprotect()

int mprotect	(	void *	addr,
		size_t	len,
		int	prot
	)

Changes protection for the calling process' address.

Parameters

addr	Pointer to the base address.
len	Length of the memory.
prot	New protection.

Returns

0 on success, -1 otherwise.

Changes protection for the calling process' memory page. addr must be a valid adress in the user space. prot must be compatible with the old protection.

Conformity: None.

Supported OS: Windows Vista