Shared memory IPC utility functions

Introduction

Files
file	cb_ipcshmem.h
	Shared memory IPC utility functions.

Functions
void *	cb_get_shared_mem (int *memfd, const char *shmname, size_t size, int flag)
	get new shared memory More...
int	cb_close_shared_mem (void *mem, int *memfd, const char *shmname, size_t size, bool unlink)
	close shared memory More...

Function Documentation

cb_get_shared_mem()

void* cb_get_shared_mem	(	int *	memfd,
		const char *	shmname,
		size_t	size,
		int	flag
	)

get new shared memory

Parameters

memfd	shared memory file descriptor
shmname	shared memory name to be used for shm_open
size	size of shared memroy
flag	flag to be used for shm_open i.e O_RDONLY, O_RDWR, O_WRONLY, O_CREAT, O_EXCL,O_TRUNC.

See also

man shm_open().

Returns

a reference to the new shared memory, NULL if error

cb_close_shared_mem()

int cb_close_shared_mem	(	void *	mem,
		int *	memfd,
		const char *	shmname,
		size_t	size,
		bool	unlink
	)

close shared memory

Parameters

mem	mapped shared memory
memfd	shared memory file descriptor
shmname	shared memory name
size	size of shared memory
unlink	flag indicating if shared memory will be unlinked

Returns

0 on success, -1 on error