通过socket ID来获得对方连接端的属性

sokcet();
bind();
listen(s_fdlisten,...);
s_fdaccept = accept(s_fdlisten, (sockaddr *) &peeraddr, &socklen);

err = getsockopt(s_fdCommand, SOL_SOCKET, SO_PEERCRED, &creds, &szCreds);

    if (err == 0 && szCreds > 0) {
        errno = 0;
        pwd = getpwuid(creds.uid);
        if (pwd != NULL) {
            if (strcmp(pwd->pw_name, PHONE_PROCESS) == 0) {
                is_phone_socket = 1;
            } else {
                LOGE("RILD can't accept socket from process %s", pwd->pw_name);
            }
        } else {
            LOGE("Error on getpwuid() errno: %d", errno);
        }
    } else {
        LOGD("Error on getsockopt() errno: %d", errno);
    }