/* Deserialize a handle.
* str_hnd : A null-terminated string of len str_hnd_len that
* contains the serialized handle.
* hnd : If the call succeeds the user gets back a handle,hnd, to
* shared mem - deserialized from strhnd. This handle
* will refer to the shm seg referred by the serialized
* handle.
*/
int MPL_shm_hnd_deserialize(MPL_shm_hnd_t hnd, const char *str_hnd, size_t str_hnd_len)
{
int rc = -1;
MPLI_shm_hnd_reset_val(hnd);
rc = MPLI_shm_ghnd_alloc(hnd, MPL_MEM_SHM);
rc = MPLI_shm_ghnd_set_by_val(hnd, "%s", str_hnd);
rc = MPL_shm_seg_open(hnd, 0);
return rc;
}
/* A template function which creates/attaches shm seg handle
* to the shared memory. Used by user-exposed functions below
*/
static inline int MPL_shm_seg_create_attach_templ(MPL_shm_hnd_t hnd, intptr_t seg_sz,
void **shm_addr_ptr, int offset, int flag)
{
int rc = MPL_SHM_SUCCESS;
int lhnd = -1;
if (flag & MPLI_SHM_FLAG_SHM_CREATE) {
lhnd = shmget(IPC_PRIVATE, seg_sz, IPC_CREAT | S_IRWXU);
MPLI_shm_lhnd_set(hnd, lhnd);
rc = MPLI_shm_ghnd_alloc(hnd, MPL_MEM_SHM);
if (rc) {
goto fn_exit;
}
rc = MPLI_shm_ghnd_set_by_val(hnd, "%d", lhnd);
if (rc != MPL_SHM_SUCCESS) {
goto fn_exit;
}
} else {
/* Open an existing shared memory seg */
if (!MPLI_shm_lhnd_is_valid(hnd)) {
lhnd = atoi(MPLI_shm_ghnd_get_by_ref(hnd));
MPLI_shm_lhnd_set(hnd, lhnd);
}
}
if (flag & MPLI_SHM_FLAG_SHM_ATTACH) {
const void *start_addr = NULL;
/* Caller ensures that shmaddr must be a page-aligned address
* at which the attach occurs. EINVAL error would result if a
* mapping already exists in this address range or the address
* is not page-aligned. */
if (flag & MPLI_SHM_FLAG_FIXED_ADDR)
start_addr = (const void *) *shm_addr_ptr;
/* Attach to shared mem seg */
*shm_addr_ptr = shmat(MPLI_shm_lhnd_get(hnd), start_addr, 0x0);
if (*shm_addr_ptr == (void *) -1) {
rc = MPL_SHM_EINVAL;
}
}
fn_exit:
return rc;
}
