int Shm::server_initialize_shm (int new_registry) {
int rc;
jack_d("server_initialize_shm\n");
if (jack_shm_header)
return 0; /* already initialized */
if (shm_lock_registry () < 0) {
jack_error ("jack_shm_lock_registry fails...");
return -1;
}
rc = access_registry (®istry_info);
if (new_registry) {
remove_shm (®istry_id);
rc = ENOENT;
}
switch (rc) {
case ENOENT: /* registry does not exist */
rc = create_registry (®istry_info);
break;
case 0: /* existing registry */
if (shm_validate_registry () == 0)
break;
/* else it was invalid, so fall through */
case EINVAL: /* bad registry */
/* Apparently, this registry was created by an older
* JACK version. Delete it so we can try again. */
release_shm (®istry_info);
remove_shm (®istry_id);
if ((rc = create_registry (®istry_info)) != 0) {
//jack_error ("incompatible shm registry (%s)",
// strerror (errno));
jack_error ("incompatible shm registry");
//#ifndef USE_POSIX_SHM
// jack_error ("to delete, use `ipcrm -M 0x%0.8x'", JACK_SHM_REGISTRY_KEY);
//#endif
}
break;
default: /* failure return code */
break;
}
shm_unlock_registry ();
return rc;
}
void Shm::destroy_shm (jack_shm_info_t* si) {
/* must NOT have the registry locked */
if (si->index == JACK_SHM_NULL_INDEX)
return; /* segment not allocated */
remove_shm (&jack_shm_registry[si->index].id);
release_shm_info (si->index);
}
int Shm::cleanup_shm (void) {
int i;
int destroy;
jack_shm_info_t copy;
if (shm_lock_registry () < 0) {
jack_error ("jack_shm_lock_registry fails...");
return -1;
}
for (i = 0; i < MAX_SHM_ID; i++) {
jack_shm_registry_t* r;
r = &jack_shm_registry[i];
memcpy (©, r, sizeof (jack_shm_info_t));
destroy = FALSE;
/* ignore unused entries */
if (r->allocator == 0)
continue;
/* is this my shm segment? */
if (r->allocator == GetPID()) {
/* allocated by this process, so unattach
and destroy. */
release_shm (©);
destroy = TRUE;
} else {
/* see if allocator still exists */
if (kill (r->allocator, 0)) {
if (errno == ESRCH) {
/* allocator no longer exists,
* so destroy */
destroy = TRUE;
}
}
}
if (destroy) {
int index = copy.index;
if ((index >= 0) && (index < MAX_SHM_ID)) {
remove_shm (&jack_shm_registry[index].id);
release_shm_entry (index);
}
r->size = 0;
r->allocator = 0;
}
}
shm_unlock_registry ();
return TRUE;
}
// Returns -1 if 'uidshm' == NULL and shared memory does not exist.
// Otherwise does nothing and returns 0.
int resolve_ucache(void)
{
int iscreate = 0;
if (uidshm == NULL) {
uidshm = attach_shm2("UCACHE_SHMKEY", 3696, sizeof(*uidshm),
&iscreate);
if (uidshm == NULL)
return -1;
}
if (iscreate) {
remove_shm("UCACHE_SHMKEY", 3696, sizeof(*uidshm));
report("Error: miscd is not running!", "");
return -1;
}
return 0;
}