static void nn_bipc_start_listening (struct nn_bipc *self)
{
int rc;
struct sockaddr_storage ss;
struct sockaddr_un *un;
const char *addr;
#if !defined NN_HAVE_WINDOWS
int fd;
int opt;
#endif
/* First, create the AF_UNIX address. */
addr = nn_epbase_getaddr (&self->epbase);
memset (&ss, 0, sizeof (ss));
un = (struct sockaddr_un*) &ss;
nn_assert (strlen (addr) < sizeof (un->sun_path));
ss.ss_family = AF_UNIX;
strncpy (un->sun_path, addr, sizeof (un->sun_path));
/* Delete the IPC file left over by eventual previous runs of
the application. We'll check whether the file is still in use by
connecting to the endpoint. On Windows plaform, NamedPipe is used
which does not have an underlying file. */
#if !defined NN_HAVE_WINDOWS
fd = socket (AF_UNIX, SOCK_STREAM, 0);
if (fd >= 0) {
rc = fcntl (fd, F_SETFL, O_NONBLOCK);
errno_assert (rc != -1 || errno == EINVAL);
rc = connect (fd, (struct sockaddr*) &ss,
sizeof (struct sockaddr_un));
if (rc == -1 && errno == ECONNREFUSED) {
rc = unlink (addr);
errno_assert (rc == 0 || errno == ENOENT);
}
rc = close (fd);
errno_assert (rc == 0);
}
#endif
/* Start listening for incoming connections. */
rc = nn_usock_start (&self->usock, AF_UNIX, SOCK_STREAM, 0);
if (nn_slow (rc < 0)) {
nn_backoff_start (&self->retry);
self->state = NN_BIPC_STATE_WAITING;
return;
}
rc = nn_usock_bind (&self->usock,
(struct sockaddr*) &ss, sizeof (struct sockaddr_un));
if (nn_slow (rc < 0)) {
nn_usock_stop (&self->usock);
self->state = NN_BIPC_STATE_CLOSING;
return;
}
rc = nn_usock_listen (&self->usock, NN_BIPC_BACKLOG);
if (nn_slow (rc < 0)) {
nn_usock_stop (&self->usock);
self->state = NN_BIPC_STATE_CLOSING;
return;
}
nn_bipc_start_accepting (self);
self->state = NN_BIPC_STATE_ACTIVE;
}
static void nn_bipc_handler (struct nn_fsm *self, int src, int type,
void *srcptr)
{
struct nn_bipc *bipc;
struct nn_list_item *it;
struct nn_aipc *aipc;
bipc = nn_cont (self, struct nn_bipc, fsm);
/******************************************************************************/
/* STOP procedure. */
/******************************************************************************/
if (nn_slow (src == NN_FSM_ACTION && type == NN_FSM_STOP)) {
nn_aipc_stop (bipc->aipc);
bipc->state = NN_BIPC_STATE_STOPPING_AIPC;
}
if (nn_slow (bipc->state == NN_BIPC_STATE_STOPPING_AIPC)) {
if (!nn_aipc_isidle (bipc->aipc))
return;
nn_aipc_term (bipc->aipc);
nn_free (bipc->aipc);
bipc->aipc = NULL;
nn_usock_stop (&bipc->usock);
bipc->state = NN_BIPC_STATE_STOPPING_USOCK;
}
if (nn_slow (bipc->state == NN_BIPC_STATE_STOPPING_USOCK)) {
if (!nn_usock_isidle (&bipc->usock))
return;
for (it = nn_list_begin (&bipc->aipcs);
it != nn_list_end (&bipc->aipcs);
it = nn_list_next (&bipc->aipcs, it)) {
aipc = nn_cont (it, struct nn_aipc, item);
nn_aipc_stop (aipc);
}
bipc->state = NN_BIPC_STATE_STOPPING_AIPCS;
goto aipcs_stopping;
}
if (nn_slow (bipc->state == NN_BIPC_STATE_STOPPING_AIPCS)) {
nn_assert (src == NN_BIPC_SRC_AIPC && type == NN_AIPC_STOPPED);
aipc = (struct nn_aipc *) srcptr;
nn_list_erase (&bipc->aipcs, &aipc->item);
nn_aipc_term (aipc);
nn_free (aipc);
/* If there are no more aipc state machines, we can stop the whole
bipc object. */
aipcs_stopping:
if (nn_list_empty (&bipc->aipcs)) {
bipc->state = NN_BIPC_STATE_IDLE;
nn_fsm_stopped_noevent (&bipc->fsm);
nn_epbase_stopped (&bipc->epbase);
return;
}
return;
}
switch (bipc->state) {
/******************************************************************************/
/* IDLE state. */
/******************************************************************************/
case NN_BIPC_STATE_IDLE:
switch (src) {
case NN_FSM_ACTION:
switch (type) {
case NN_FSM_START:
nn_bipc_start_listening (bipc);
nn_bipc_start_accepting (bipc);
bipc->state = NN_BIPC_STATE_ACTIVE;
return;
default:
nn_fsm_bad_action (bipc->state, src, type);
}
default:
nn_fsm_bad_source (bipc->state, src, type);
}
/******************************************************************************/
/* ACTIVE state. */
/* The execution is yielded to the aipc state machine in this state. */
/******************************************************************************/
case NN_BIPC_STATE_ACTIVE:
if (srcptr == bipc->aipc) {
switch (type) {
case NN_AIPC_ACCEPTED:
/* Move the newly created connection to the list of existing
connections. */
nn_list_insert (&bipc->aipcs, &bipc->aipc->item,
nn_list_end (&bipc->aipcs));
bipc->aipc = NULL;
/* Start waiting for a new incoming connection. */
nn_bipc_start_accepting (bipc);
return;
default:
nn_fsm_bad_action (bipc->state, src, type);
}
}
/* For all remaining events we'll assume they are coming from one
of remaining child aipc objects. */
nn_assert (src == NN_BIPC_SRC_AIPC);
aipc = (struct nn_aipc*) srcptr;
switch (type) {
case NN_AIPC_ERROR:
nn_aipc_stop (aipc);
return;
case NN_AIPC_STOPPED:
nn_list_erase (&bipc->aipcs, &aipc->item);
nn_aipc_term (aipc);
nn_free (aipc);
return;
default:
nn_fsm_bad_action (bipc->state, src, type);
}
/******************************************************************************/
/* Invalid state. */
/******************************************************************************/
default:
nn_fsm_bad_state (bipc->state, src, type);
}
}
static void nn_bipc_handler (struct nn_fsm *self, int src, int type,
void *srcptr)
{
struct nn_bipc *bipc;
struct nn_aipc *aipc;
bipc = nn_cont (self, struct nn_bipc, fsm);
nn_assert(bipc);
switch (bipc->state) {
/******************************************************************************/
/* IDLE state. */
/******************************************************************************/
case NN_BIPC_STATE_IDLE:
switch (src) {
case NN_FSM_ACTION:
switch (type) {
case NN_FSM_START:
nn_bipc_start_listening (bipc);
return;
default:
nn_fsm_bad_action (bipc->state, src, type);
}
default:
nn_fsm_bad_source (bipc->state, src, type);
}
/******************************************************************************/
/* ACTIVE state. */
/* The execution is yielded to the aipc state machine in this state. */
/******************************************************************************/
case NN_BIPC_STATE_ACTIVE:
if (srcptr == bipc->aipc) {
switch (type) {
case NN_AIPC_ACCEPTED:
/* Move the newly created connection to the list of existing
connections. */
nn_list_insert (&bipc->aipcs, &bipc->aipc->item,
nn_list_end (&bipc->aipcs));
bipc->aipc = NULL;
/* Start waiting for a new incoming connection. */
nn_bipc_start_accepting (bipc);
return;
default:
nn_fsm_bad_action (bipc->state, src, type);
}
}
/* For all remaining events we'll assume they are coming from one
of remaining child aipc objects. */
nn_assert (src == NN_BIPC_SRC_AIPC);
aipc = (struct nn_aipc*) srcptr;
switch (type) {
case NN_AIPC_ERROR:
nn_aipc_stop (aipc);
return;
case NN_AIPC_STOPPED:
nn_list_erase (&bipc->aipcs, &aipc->item);
nn_aipc_term (aipc);
nn_free (aipc);
return;
default:
nn_fsm_bad_action (bipc->state, src, type);
}
/******************************************************************************/
/* CLOSING_USOCK state. */
/* usock object was asked to stop but it haven't stopped yet. */
/******************************************************************************/
case NN_BIPC_STATE_CLOSING:
switch (src) {
case NN_BIPC_SRC_USOCK:
switch (type) {
case NN_USOCK_SHUTDOWN:
return;
case NN_USOCK_STOPPED:
nn_backoff_start (&bipc->retry);
bipc->state = NN_BIPC_STATE_WAITING;
return;
default:
nn_fsm_bad_action (bipc->state, src, type);
}
default:
nn_fsm_bad_source (bipc->state, src, type);
}
/******************************************************************************/
/* WAITING state. */
/* Waiting before re-bind is attempted. This way we won't overload */
/* the system by continuous re-bind attemps. */
/******************************************************************************/
case NN_BIPC_STATE_WAITING:
switch (src) {
case NN_BIPC_SRC_RECONNECT_TIMER:
switch (type) {
case NN_BACKOFF_TIMEOUT:
nn_backoff_stop (&bipc->retry);
bipc->state = NN_BIPC_STATE_STOPPING_BACKOFF;
return;
default:
nn_fsm_bad_action (bipc->state, src, type);
}
default:
nn_fsm_bad_source (bipc->state, src, type);
}
/******************************************************************************/
/* STOPPING_BACKOFF state. */
/* backoff object was asked to stop, but it haven't stopped yet. */
/******************************************************************************/
case NN_BIPC_STATE_STOPPING_BACKOFF:
switch (src) {
case NN_BIPC_SRC_RECONNECT_TIMER:
switch (type) {
case NN_BACKOFF_STOPPED:
nn_bipc_start_listening (bipc);
return;
default:
nn_fsm_bad_action (bipc->state, src, type);
}
default:
nn_fsm_bad_source (bipc->state, src, type);
}
/******************************************************************************/
/* Invalid state. */
/******************************************************************************/
default:
nn_fsm_bad_state (bipc->state, src, type);
}
}
static void nn_bipc_handler (struct nn_fsm *self, int src, int type,
void *srcptr)
{
struct nn_bipc *bipc;
struct nn_aipc *aipc;
bipc = nn_cont (self, struct nn_bipc, fsm);
switch (bipc->state) {
/******************************************************************************/
/* IDLE state. */
/******************************************************************************/
case NN_BIPC_STATE_IDLE:
switch (src) {
case NN_FSM_ACTION:
switch (type) {
case NN_FSM_START:
nn_bipc_start_listening (bipc);
nn_bipc_start_accepting (bipc);
bipc->state = NN_BIPC_STATE_ACTIVE;
return;
default:
nn_fsm_bad_action (bipc->state, src, type);
}
default:
nn_fsm_bad_source (bipc->state, src, type);
}
/******************************************************************************/
/* ACTIVE state. */
/* The execution is yielded to the aipc state machine in this state. */
/******************************************************************************/
case NN_BIPC_STATE_ACTIVE:
if (srcptr == bipc->aipc) {
switch (type) {
case NN_AIPC_ACCEPTED:
/* Move the newly created connection to the list of existing
connections. */
nn_list_insert (&bipc->aipcs, &bipc->aipc->item,
nn_list_end (&bipc->aipcs));
bipc->aipc = NULL;
/* Start waiting for a new incoming connection. */
nn_bipc_start_accepting (bipc);
return;
default:
nn_fsm_bad_action (bipc->state, src, type);
}
}
/* For all remaining events we'll assume they are coming from one
of remaining child aipc objects. */
nn_assert (src == NN_BIPC_SRC_AIPC);
aipc = (struct nn_aipc*) srcptr;
switch (type) {
case NN_AIPC_ERROR:
nn_aipc_stop (aipc);
return;
case NN_AIPC_STOPPED:
nn_list_erase (&bipc->aipcs, &aipc->item);
nn_aipc_term (aipc);
nn_free (aipc);
return;
default:
nn_fsm_bad_action (bipc->state, src, type);
}
/******************************************************************************/
/* Invalid state. */
/******************************************************************************/
default:
nn_fsm_bad_state (bipc->state, src, type);
}
}
