epoll 实际使用

void DataHandle::recv() {

    sleep(2);

    _data_router -> readInfoHw(&mInfo);

    ALOGD(SYS_LOG_TAG "readInfoHW: conn=%d, init=%d, numC=%d, MAC=%s",

            mInfo.isBTConnected, mInfo.isBTInitialized, mInfo.numClient, mInfo.BTMACaddr);

    ALOGD(SYS_LOG_TAG "readInfoHW: sentP=%lld, recvP=%lld, dropP=%lld, sentB=%lld, recvB=%lld",

            mInfo.sentPacket, mInfo.recvPacket, mInfo.dropPacket,

            mInfo.sentByte, mInfo.recvByte);

    ALOGD(SYS_LOG_TAG "before begin recv.........................");

    bool mac_st = false;

    if (strlen(mInfo.BTMACaddr) > 0) {

        mac_st = SysWatcher::instance()->setMacAddr(mInfo.BTMACaddr);

    }

    int dfd = _data_router->getReadFd();

    struct epoll_event event;

    struct epoll_event * _events;

    int efd = epoll_create1(0);

    if (efd == -1) {

        perror("epoll_create");

        abort();

    }

    event.data.fd = dfd;

    event.events = EPOLLIN | EPOLLET;

    int s = epoll_ctl(efd, EPOLL_CTL_ADD, dfd, &event);

    if (s == -1) {

        perror("epoll_ctl");

        abort();

    }

    _events = (epoll_event *) calloc(MAXEVENTS, sizeof(event));

    int done;

    string message;

    const int RECV_BUF_DEPTH = 200;

    char buf[RECV_BUF_DEPTH] = { 0 };

    while (1) {

int n, i; n = epoll_wait(efd, _events, MAXEVENTS, -1); for (i = 0; i < n; i++) { if ((_events[i].events & EPOLLERR) || (_events[i].events & EPOLLHUP) || (!(_events[i].events & EPOLLIN))) { ALOGD(SYS_LOG_TAG " SysWatcher::EPOLLERR||EPOLLHUP||!EPOLLIN "); fprintf(stderr, "epoll error "); close(_events[i].data.fd); continue; } else if (dfd == _events[i].data.fd) { ssize_t count; memset(buf, 0, RECV_BUF_DEPTH); /* count = read(_events[i].data.fd, buf, RECV_BUF_DEPTH); if (count == -1) { // If errno == EAGAIN, that means we have read all data. So go back to the main loop. if (errno != EAGAIN) { perror("read"); done = 1; ALOGD(SYS_LOG_TAG " SysWatcher:: errno != EAGAIN "); } ALOGD(SYS_LOG_TAG " SysWatcher:: errno == EAGAIN "); break; } else if (count == 0) { //��ʱ // End of file. The remote has closed the connection. done = 1; ALOGD(SYS_LOG_TAG "SysWatcher::recv() DISCONNECTED."); break; }*/ message = string(buf); ALOGD(SYS_LOG_TAG " SysWatcher Recive Data from BLEPare data=%s ", buf); bool dis_st = RouterSysWatcher::dispath(message); message = ""; memset(buf, 0, RECV_BUF_DEPTH); if (dis_st) { ALOGD(SYS_LOG_TAG "dispath sucess! dis_ret =%d", dis_st); } else {  
ALOGD(SYS_LOG_TAG "dispath error! dis_ret =%d", dis_st); continue; } ALOGD(SYS_LOG_TAG " Epoll test, buf = %s, count =%d", buf, count); } } _data_router -> readInfoHw(&mInfo); if (strlen(mInfo.BTMACaddr) > 0 and mac_st == false) { mac_st = SysWatcher::instance()->setMacAddr(mInfo.BTMACaddr); ALOGD(SYS_LOG_TAG "......readInfoHW: conn=%d, init=%d, numC=%d, MAC=%s", mInfo.isBTConnected, mInfo.isBTInitialized, mInfo.numClient, mInfo.BTMACaddr); } } free(_events); _events = 0; close(dfd); }