Listing 43 in C

int
zre_peer_send (zre_peer_t *self, zre_msg_t **msg_p)
{
assert (self);
if (self->connected) {
if (zre_msg_send (msg_p, self->mailbox) && errno == EAGAIN) {
zre_peer_disconnect (self);
return -1;
}
}
return 0;
}