Command: semids

def semid(broker):
        """Command: semids"""
        source = broker[DefaultSpecs.ipcs_s].content
        results = set()
        for s in source:
            s_splits = s.split()
            # key        semid      owner      perms      nsems
            # 0x00000000 65536      apache     600        1
            if len(s_splits) == 5 and s_splits[1].isdigit():
                results.add(s_splits[1])
        return results