Opening

Once smux_init succeeds, the peer program starts selecting for writability on the file descriptor returned. Once xselect says the program can write to the fd, foosmuxd calls the routine smux_simple_open, which tries to establish an SMUX association.

    if (smux_simple_open(&se->se_identity, "SMUX NEWD daemon",
                 se->se_password, strlen(se->se_password))
        == NOTOK) {
        if (smux_errno == inProgress)
            return;

        LIB_ERROR2("smux_simple_open: %s [%s]", smux_error(smux_errno),
		 smux_info);
        smux_fd = NOTOK;
        return;
    }