Shared Memory

Typedefs
typedef ix_shm_s	ix_shm_t
	shared memory class
Enumerations
enum	ix_shm_type_e { IX_SHM_CRMP = 0x01, IX_SHM_MP = 0x02 }
	modus of shared memory mapping More...
Functions
ix_shm_t *	ix_shm_new (char *shm_name, void *adr, int len, ix_shm_type_e flag)
ix_shm_t *	ix_shm_new_sv (char *shm_name, void *adr, int len, ix_shm_type_e flag)
void	ix_shm_free (ix_shm_t *psm)
void	ix_shm_free_sv (ix_shm_t *psm)
int	ix_shm_adr (ix_shm_t *psm, void **padr, int *plen)
ix_shm_t *	ix_shm_get (char *name)

---

Enumeration Type Documentation

enum ix_shm_type_e

modus of shared memory mapping

Enumerator:

IX_SHM_CRMP	create and map shared memory
IX_SHM_MP	map shared memory

---

Function Documentation

int ix_shm_adr	(	ix_shm_t *	psm,
		void **	padr,
		int *	plen
	)

retrieve pointer and length of shared mem by handle

Parameters:

	psm	handle of shared memory
	padr	where to store pointer
	plen	where to store length

Returns:

• 0: OK
• !0: error

void ix_shm_free

(

ix_shm_t *

psm

)

detaches and removes shared memory if created by this process

Parameters:

psm

handle of shared memory

ix_shm_t* ix_shm_get

(

char *

name

)

handle for shared mem by name

Parameters:

name

name of shared memory

Returns:

• Handle
• NULL: error

ix_shm_t* ix_shm_new	(	char *	shm_name,
		void *	adr,
		int	len,
		ix_shm_type_e	flag
	)

create and/or attach shared memory to application memory region

Parameters:

	shm_name	id of shared memory by name (character string which must not contain a slash)
	len	length of memory to map
	adr	memory to map to shared memory, must be page aligned
	flag	map or create and map, s. ix_shm_type_e

Returns:

• handle of shared memory
• NULL: error

---