{"id":46857,"date":"2025-07-30T04:26:55","date_gmt":"2025-07-29T20:26:55","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/46857.html"},"modified":"2025-07-30T04:26:55","modified_gmt":"2025-07-29T20:26:55","slug":"reactor%e4%bb%a5%e5%8f%8a%e7%99%be%e4%b8%87%e6%9c%8d%e5%8a%a1%e5%99%a8%e5%b9%b6%e5%8f%91%e7%9a%84%e5%ae%9e%e7%8e%b0","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/46857.html","title":{"rendered":"reactor\u4ee5\u53ca\u767e\u4e07\u670d\u52a1\u5668\u5e76\u53d1\u7684\u5b9e\u73b0"},"content":{"rendered":"

\u4e00\u3001reactor\u7684\u5b9e\u73b0<\/h2>\n

\u96f6\u58f0\u6559\u80b2<\/p>\n

reator\u7684\u4f18\u70b9<\/h3>\n

\u4e0d\u540c\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26(fd)\u53d1\u751f\u4e86\u4e0d\u540c\u7684\u4e8b\u4ef6（event），\u5c31\u4f1a\u81ea\u52a8\u5206\u6d3e\u5230\u4e0d\u540c\u7684\u56de\u8c03\u51fd\u6570(callback)\u53bb\u5904\u7406\u3002 \u5bf9\u4e8eepoll\u6765\u8bf4，\u5982\u679c\u4e00\u4e2aio\u53d1\u9001\u5927\u6570\u636e\u5305\u4ee5\u81f3\u4e8e\u8d85\u8fc7\u4e86buffer\u7684\u5927\u5c0f，\u4f1a\u5bfc\u81f4\u591a\u51fa\u7684\u6570\u636e\u6ca1\u529e\u6cd5\u5b58\u4e0b\u6765\u3002 reactor\u505a\u5230\u4e86：\u4e0d\u540c\u7684\u4e8b\u4ef6，\u505a\u4e0d\u540c\u7684action，\u5e76\u4e14\u6bcf\u4e2aio\u72ec\u7acb\u3002<\/p>\n

reactor.c\u4ee3\u7801<\/h3>\n

\u200b
\n#<\/span>include<\/span> <errno.h><\/span><\/span>
\n#<\/span>include<\/span> <stdio.h><\/span><\/span>
\n#<\/span>include<\/span> <sys\/socket.h><\/span><\/span>
\n#<\/span>include<\/span> <netinet\/in.h><\/span><\/span>
\n#<\/span>include<\/span> <string.h><\/span><\/span>
\n#<\/span>include<\/span> <pthread.h><\/span><\/span>
\n#<\/span>include<\/span> <unistd.h><\/span><\/span>
\n#<\/span>include<\/span> <poll.h><\/span><\/span>
\n#<\/span>include<\/span> <sys\/epoll.h><\/span><\/span>
\n#<\/span>include<\/span> <errno.h><\/span><\/span>
\n#<\/span>include<\/span> <sys\/time.h><\/span><\/span><\/p>\n

#<\/span>define<\/span> BUFFER_LENGTH<\/span> 1024<\/span><\/span><\/span>
\n#<\/span>define<\/span> CONNECTION_SIZE<\/span> 1024<\/span><\/span><\/span><\/p>\n

typedef<\/span> int<\/span> (<\/span>*<\/span>RCALLBACK)<\/span>(<\/span>int<\/span> fd)<\/span>;<\/span><\/p>\n

int<\/span> accept_cb<\/span>(<\/span>int<\/span> fd)<\/span>;<\/span><\/p>\n

int<\/span> recv_cb<\/span>(<\/span>int<\/span> fd)<\/span>;<\/span><\/p>\n

int<\/span> send_cb<\/span>(<\/span>int<\/span> fd)<\/span>;<\/span><\/p>\n

int<\/span> epfd =<\/span> 0<\/span>;<\/span><\/p>\n

struct<\/span> conn<\/span> {<\/span>
\nint<\/span> fd;<\/span><\/p>\n

char<\/span> rbuffer[<\/span>BUFFER_LENGTH]<\/span>;<\/span>
\nint<\/span> rlength;<\/span><\/p>\n

char<\/span> wbuffer[<\/span>BUFFER_LENGTH]<\/span>;<\/span>
\nint<\/span> wlength;<\/span><\/p>\n

RCALLBACK send_callback;<\/span><\/p>\n

union<\/span> {<\/span>
\nRCALLBACK recv_callback;<\/span>
\nRCALLBACK accept_callback;<\/span>
\n}<\/span>r_action;<\/span>
\n}<\/span>;<\/span><\/p>\n

struct<\/span> conn<\/span> conn_list[<\/span>CONNECTION_SIZE]<\/span> =<\/span> {<\/span>0<\/span>}<\/span>;<\/span><\/p>\n

int<\/span> set_event<\/span>(<\/span>int<\/span> fd,<\/span> int<\/span> event,<\/span> int<\/span> flag)<\/span> {<\/span><\/p>\n

if<\/span> (<\/span>flag)<\/span> {<\/span><\/p>\n

struct<\/span> epoll_event<\/span> ev;<\/span>
\nev.<\/span>events =<\/span> event;<\/span>
\nev.<\/span>data.<\/span>fd =<\/span> fd;<\/span>
\nepoll_ctl<\/span>(<\/span>epfd,<\/span> EPOLL_CTL_ADD,<\/span> fd,<\/span> &<\/span>ev)<\/span>;<\/span><\/p>\n

}<\/span> else<\/span> {<\/span><\/p>\n

struct<\/span> epoll_event<\/span> ev;<\/span>
\nev.<\/span>events =<\/span> event;<\/span>
\nev.<\/span>data.<\/span>fd =<\/span> fd;<\/span>
\nepoll_ctl<\/span>(<\/span>epfd,<\/span> EPOLL_CTL_MOD,<\/span> fd,<\/span> &<\/span>ev)<\/span>;<\/span><\/p>\n

}<\/span><\/p>\n

}<\/span><\/p>\n

int<\/span> event_register<\/span>(<\/span>int<\/span> fd,<\/span> int<\/span> event)<\/span> {<\/span><\/p>\n

conn_list[<\/span>fd]<\/span>.<\/span>fd =<\/span> fd;<\/span>
\nconn_list[<\/span>fd]<\/span>.<\/span>r_action.<\/span>recv_callback =<\/span> recv_cb;<\/span>
\nconn_list[<\/span>fd]<\/span>.<\/span>send_callback =<\/span> send_cb;<\/span><\/p>\n

memset<\/span>(<\/span>conn_list[<\/span>fd]<\/span>.<\/span>rbuffer,<\/span> 0<\/span>,<\/span> BUFFER_LENGTH)<\/span>;<\/span>
\nconn_list[<\/span>fd]<\/span>.<\/span>rlength =<\/span> 0<\/span>;<\/span><\/p>\n

memset<\/span>(<\/span>conn_list[<\/span>fd]<\/span>.<\/span>wbuffer,<\/span> 0<\/span>,<\/span> BUFFER_LENGTH)<\/span>;<\/span>
\nconn_list[<\/span>fd]<\/span>.<\/span>wlength =<\/span> 0<\/span>;<\/span><\/p>\n

set_event<\/span>(<\/span>fd,<\/span>event,<\/span>1<\/span>)<\/span>;<\/span><\/p>\n

}<\/span><\/p>\n

int<\/span> accept_cb<\/span>(<\/span>int<\/span> fd)<\/span> {<\/span><\/p>\n

struct<\/span> sockaddr_in<\/span> clientaddr;<\/span>
\nsocklen_t<\/span> len =<\/span> sizeof<\/span>(<\/span>clientaddr)<\/span>;<\/span><\/p>\n

int<\/span> clientfd =<\/span> accept<\/span>(<\/span>fd,<\/span> (<\/span>struct<\/span> sockaddr<\/span>*<\/span>)<\/span>&<\/span>clientaddr,<\/span> &<\/span>len)<\/span>;<\/span>
\nprintf<\/span>(<\/span>"accept finished:%d\\\\n"<\/span>,<\/span> clientfd)<\/span>;<\/span><\/p>\n

event_register<\/span>(<\/span>clientfd,<\/span>EPOLLIN)<\/span>;<\/span><\/p>\n

return<\/span> 0<\/span>;<\/span><\/p>\n

}<\/span><\/p>\n

int<\/span> recv_cb<\/span>(<\/span>int<\/span> fd)<\/span> {<\/span><\/p>\n

int<\/span> count =<\/span> recv<\/span>(<\/span>fd,<\/span> conn_list[<\/span>fd]<\/span>.<\/span>rbuffer,<\/span> BUFFER_LENGTH,<\/span> 0<\/span>)<\/span>;<\/span><\/p>\n

if<\/span> (<\/span>count ==<\/span> 0<\/span>)<\/span> {<\/span>
\nprintf<\/span>(<\/span>"client disconnect: %d\\\\n"<\/span>,<\/span> fd)<\/span>;<\/span>
\nclose<\/span>(<\/span>fd)<\/span>;<\/span><\/p>\n

epoll_ctl<\/span>(<\/span>epfd,<\/span> EPOLL_CTL_DEL,<\/span> fd,<\/span> NULL<\/span>)<\/span>;<\/span> \/\/unfinished<\/span><\/p>\n

return<\/span> 0<\/span>;<\/span>
\n}<\/span>
\nconn_list[<\/span>fd]<\/span>.<\/span>rlength =<\/span> count;<\/span><\/p>\n

printf<\/span>(<\/span>"RECV: %s\\\\n"<\/span>,<\/span> conn_list[<\/span>fd]<\/span>.<\/span>rbuffer)<\/span>;<\/span><\/p>\n

#<\/span>if<\/span> 1<\/span><\/span><\/span><\/p>\n

conn_list[<\/span>fd]<\/span>.<\/span>wlength =<\/span> conn_list[<\/span>fd]<\/span>.<\/span>rlength;<\/span>
\nmemcpy<\/span>(<\/span>conn_list[<\/span>fd]<\/span>.<\/span>wbuffer,<\/span> conn_list[<\/span>fd]<\/span>.<\/span>rbuffer,<\/span> conn_list[<\/span>fd]<\/span>.<\/span>wlength)<\/span>;<\/span><\/p>\n

#<\/span>endif<\/span><\/span><\/p>\n

set_event<\/span>(<\/span>fd,<\/span> EPOLLOUT,<\/span> 0<\/span>)<\/span>;<\/span><\/p>\n

return<\/span> count;<\/span><\/p>\n

}<\/span><\/p>\n

int<\/span> send_cb<\/span>(<\/span>int<\/span> fd)<\/span> {<\/span><\/p>\n

int<\/span> count =<\/span> send<\/span>(<\/span>fd,<\/span> conn_list[<\/span>fd]<\/span>.<\/span>wbuffer,<\/span> conn_list[<\/span>fd]<\/span>.<\/span>wlength,<\/span> 0<\/span>)<\/span>;<\/span><\/p>\n

set_event<\/span>(<\/span>fd,<\/span> EPOLLIN,<\/span> 0<\/span>)<\/span>;<\/span><\/p>\n

return<\/span> count;<\/span>
\n}<\/span><\/p>\n

int<\/span> init_server<\/span>(<\/span>unsigned<\/span> short<\/span> port)<\/span> {<\/span><\/p>\n

int<\/span> sockfd =<\/span> socket<\/span>(<\/span>AF_INET,<\/span> SOCK_STREAM,<\/span> 0<\/span>)<\/span>;<\/span><\/p>\n

struct<\/span> sockaddr_in<\/span> servaddr;<\/span>
\nservaddr.<\/span>sin_family =<\/span> AF_INET;<\/span>
\nservaddr.<\/span>sin_addr.<\/span>s_addr =<\/span> htonl<\/span>(<\/span>INADDR_ANY)<\/span>;<\/span> \/\/0.0.0<\/span>
\nservaddr.<\/span>sin_port =<\/span> htons<\/span>(<\/span>port)<\/span>;<\/span> \/\/0-1023<\/span><\/p>\n

if<\/span> (<\/span>–<\/span>1<\/span> ==<\/span> bind<\/span>(<\/span>sockfd,<\/span> (<\/span>struct<\/span> sockaddr<\/span>*<\/span>)<\/span>&<\/span>servaddr,<\/span> sizeof<\/span> (<\/span>struct<\/span> sockaddr<\/span>)<\/span>)<\/span>)<\/span> {<\/span>
\nprintf<\/span>(<\/span>"bind failed: %s\\\\n"<\/span>,<\/span> strerror<\/span>(<\/span>errno)<\/span>)<\/span>;<\/span>
\n}<\/span><\/p>\n

listen<\/span>(<\/span>sockfd,<\/span> 10<\/span>)<\/span>;<\/span>
\nprintf<\/span>(<\/span>"listen finished:%d\\\\n"<\/span>,<\/span> sockfd)<\/span>;<\/span><\/p>\n

return<\/span> sockfd;<\/span>
\n}<\/span><\/p>\n

int<\/span> main<\/span>(<\/span>)<\/span> {<\/span><\/p>\n

unsigned<\/span> short<\/span> port =<\/span> 2000<\/span>;<\/span>
\nint<\/span> sockfd =<\/span> init_server<\/span>(<\/span>port)<\/span>;<\/span><\/p>\n

epfd =<\/span> epoll_create<\/span>(<\/span>1<\/span>)<\/span>;<\/span><\/p>\n

conn_list[<\/span>sockfd]<\/span>.<\/span>fd =<\/span> sockfd;<\/span>
\nconn_list[<\/span>sockfd]<\/span>.<\/span>r_action.<\/span>recv_callback =<\/span> accept_cb;<\/span><\/p>\n

set_event<\/span>(<\/span>sockfd,<\/span> EPOLLIN,<\/span> 1<\/span>)<\/span>;<\/span><\/p>\n

while<\/span> (<\/span>1<\/span>)<\/span> {<\/span> \/\/mainloop<\/span><\/p>\n

struct<\/span> epoll_event<\/span> events[<\/span>1024<\/span>]<\/span> =<\/span> {<\/span>0<\/span>}<\/span>;<\/span>
\nint<\/span> nready =<\/span> epoll_wait<\/span>(<\/span>epfd,<\/span> events,<\/span> 1024<\/span>,<\/span> –<\/span>1<\/span>)<\/span>;<\/span><\/p>\n

int<\/span> i =<\/span> 0<\/span>;<\/span>
\nfor<\/span> (<\/span>i =<\/span> 0<\/span>;<\/span>i <<\/span> nready;<\/span>i ++<\/span>)<\/span> {<\/span><\/p>\n

int<\/span> connfd =<\/span> events[<\/span>i]<\/span>.<\/span>data.<\/span>fd;<\/span><\/p>\n

if<\/span> (<\/span>events[<\/span>i]<\/span>.<\/span>events &<\/span> EPOLLIN)<\/span> {<\/span>
\nconn_list[<\/span>connfd]<\/span>.<\/span>r_action.<\/span>recv_callback<\/span>(<\/span>connfd)<\/span>;<\/span>
\n}<\/span><\/p>\n

if<\/span> (<\/span>events[<\/span>i]<\/span>.<\/span>events &<\/span> EPOLLOUT)<\/span> {<\/span>
\nconn_list[<\/span>connfd]<\/span>.<\/span>send_callback<\/span>(<\/span>connfd)<\/span>;<\/span>
\n}<\/span>
\n}<\/span><\/p>\n

}<\/span><\/p>\n

}<\/span><\/p>\n

\u200b<\/p>\n

  • main()\u51fd\u6570\u4e2d，\u6709\u8fd9\u4e48\u4e00\u884cconn_list[sockfd].r_action.recv_callback = accept_cb;\u521a\u5f00\u59cb\u65f6\u6211\u8ba4\u4e3a\u5e94\u8be5\u662fconn_list[sockfd].r_action.accept_callback = accept_cb，\u540e\u6765\u624d\u77e5\u9053\u662f\u56e0\u4e3aunion \u8054\u5408\u4f53\u91cc\u9762\u6240\u6709\u6210\u5458\u5171\u7528\u4e00\u5757\u5185\u5b58，\u4f60\u8d4b\u503c\u7ed9\u54ea\u4e2a，\u5b9e\u9645\u4e0a\u53ea\u662f\u5f80\u8fd9\u4e00\u5757\u5185\u5b58\u91cc\u5199\u5730\u5740\u3002\u4e5f\u5c31\u662f\u8bf4\u7528 recv_callback \u548c accept_callback ，\u53ea\u662f\u540d\u5b57\u4e0a\u7684\u533a\u5206，\u672c\u8d28\u5c31\u662f\u540c\u4e00\u5757\u5185\u5b58\u3002\u6240\u4ee5\u5199\u6210recv_callback\u8fd8\u662faccept_callback\u90fd\u662f\u4e00\u6837\u7684\u6548\u679c\u3002<\/li>\n
  • int init_server(unsigned short port)\u7684\u4f5c\u7528\u662f\u521d\u59cb\u5316\u670d\u52a1\u5668，\u521b\u5efa socket，\u7ed1\u5b9a\u672c\u5730\u5730\u5740\u548c\u7aef\u53e3，\u7136\u540e\u8fdb\u5165\u76d1\u542c\u72b6\u6001\u5e76\u8fd4\u56de\u76d1\u542c\u7684fd，\u51c6\u5907\u597d\u63a5\u53d7\u65b0\u5ba2\u6237\u7aef\u8fde\u63a5\u3002<\/li>\n
  • int set_event(int fd, int event, int flag)\u7684\u4f5c\u7528\u662f\u5c06\u67d0\u4e2afd\u6ce8\u518c\u5230epoll\u6216\u4fee\u6539\u5df2\u7ecf\u6ce8\u518c\u7684\u4e8b\u4ef6，\u662fepoll_ctl \u7684\u5305\u88c5\u3002<\/li>\n
  • int event_register(int fd, int event)\u7684\u4f5c\u7528\u662f\u521d\u59cb\u5316\u4e00\u4e2a\u65b0\u8fde\u63a5\u7684\u7ed3\u6784\u4f53，\u5206\u914d\u5bf9\u5e94\u5339\u914d\u7684\u56de\u8c03\u51fd\u6570\u4ee5\u53ca\u6e05\u7a7a\u7f13\u5b58\u533a，\u5e76\u4e14\u628a\u8fd9\u4e2afd\u6ce8\u518c\u5230epoll\u4e8b\u4ef6\u76d1\u63a7\u5f53\u4e2d\u3002<\/li>\n
  • int accept_cb(int fd)\u7684\u4f5c\u7528\u662f\u5904\u7406\u65b0\u5ba2\u6237\u7aef\u8fde\u63a5，\u5f53\u6709\u65b0\u8fde\u63a5\u5230\u6765\u65f6\u88ab epoll \u89e6\u53d1，\u6267\u884c accept，\u5e76\u5bf9\u65b0 fd \u505a\u521d\u59cb\u5316\u3002<\/li>\n
  • int recv_cb(int fd)\u7684\u4f5c\u7528\u662f\u63a5\u6536\u5ba2\u6237\u7aef\u6570\u636e\u3002\u7528 recv() \u4ece fd \u8bfb\u53d6\u6570\u636e\u5230\u8bfb\u7f13\u51b2\u533a，\u5982\u679c\u6536\u5230\u7684\u6570\u636e\u957f\u5ea6\u662f0，\u8bf4\u660e\u5ba2\u6237\u7aef\u65ad\u5f00，\u505a\u6e05\u7406（close() \u5e76\u4ece epoll \u5220\u9664\u8be5 fd），\u5982\u679c\u6536\u5230\u6570\u636e，\u663e\u793a\u6536\u5230\u5185\u5bb9，\u62f7\u8d1d\u6536\u5230\u7684\u6570\u636e\u5230\u5199\u7f13\u51b2\u533a（\u5b9e\u73b0 echo \u529f\u80fd），\u4fee\u6539 fd \u7684 epoll \u4e8b\u4ef6\u4e3aEPOLLOUT （\u51c6\u5907\u56de\u5199\u6570\u636e）\u3002<\/li>\n
  • int send_cb(int fd)\u7684\u4f5c\u7528\u662f\u53d1\u9001\u6570\u636e\u7ed9\u5ba2\u6237\u7aef\u3002\u7528 send() \u628a\u5199\u7f13\u51b2\u533a\u7684\u6570\u636e\u5199\u7ed9\u5ba2\u6237\u7aef，\u4fee\u6539 fd \u7684 epoll \u4e8b\u4ef6\u4e3a EPOLLIN\u3002<\/li>\n

    \u4e8c\u3001\u670d\u52a1\u5668\u767e\u4e07\u5e76\u53d1<\/h2>\n

    \u5c06\u4e0a\u9762reactor.c\u7684\u4ee3\u7801\u4e2d\u7684CONNECTION_SIZE\u5b8f\u5b9a\u4e49\u4e3a1048576，\u7528\u4f5c\u670d\u52a1\u5668\u3002<\/p>\n

    \u5ba2\u6237\u7aef\u4ee3\u7801mul_port_client_epoll.c<\/h3>\n

    \u200b
    \n#<\/span>include<\/span> <stdio.h><\/span><\/span>
    \n#<\/span>include<\/span> <string.h><\/span><\/span>
    \n#<\/span>include<\/span> <stdlib.h><\/span><\/span><\/p>\n

    #<\/span>include<\/span> <sys\/types.h><\/span><\/span>
    \n#<\/span>include<\/span> <sys\/socket.h><\/span><\/span>
    \n#<\/span>include<\/span> <sys\/epoll.h><\/span><\/span>
    \n#<\/span>include<\/span> <errno.h><\/span><\/span>
    \n#<\/span>include<\/span> <netinet\/tcp.h><\/span><\/span>
    \n#<\/span>include<\/span> <arpa\/inet.h><\/span><\/span>
    \n#<\/span>include<\/span> <netdb.h><\/span><\/span>
    \n#<\/span>include<\/span> <fcntl.h><\/span><\/span>
    \n#<\/span>include<\/span> <sys\/time.h><\/span><\/span>
    \n#<\/span>include<\/span> <unistd.h><\/span><\/span><\/p>\n

    #<\/span>define<\/span> MAX_BUFFER<\/span>128<\/span><\/span><\/span>
    \n#<\/span>define<\/span> MAX_EPOLLSIZE<\/span>(<\/span>384<\/span>*<\/span>1024<\/span>)<\/span><\/span><\/span>
    \n#<\/span>define<\/span> MAX_PORT<\/span>1<\/span><\/span><\/span><\/p>\n

    #<\/span>define<\/span> TIME_SUB_MS<\/span>(<\/span>tv1,<\/span> tv2)<\/span> (<\/span>(<\/span>tv1.<\/span>tv_sec –<\/span> tv2.<\/span>tv_sec)<\/span> *<\/span> 1000<\/span> +<\/span> (<\/span>tv1.<\/span>tv_usec –<\/span> tv2.<\/span>tv_usec)<\/span> \/<\/span> 1000<\/span>)<\/span><\/span><\/span><\/p>\n

    int<\/span> isContinue =<\/span> 0<\/span>;<\/span><\/p>\n

    static<\/span> int<\/span> ntySetNonblock<\/span>(<\/span>int<\/span> fd)<\/span> {<\/span>
    \nint<\/span> flags;<\/span><\/p>\n

    flags =<\/span> fcntl<\/span>(<\/span>fd,<\/span> F_GETFL,<\/span> 0<\/span>)<\/span>;<\/span>
    \nif<\/span> (<\/span>flags <<\/span> 0<\/span>)<\/span> return<\/span> flags;<\/span>
    \nflags |=<\/span> O_NONBLOCK;<\/span>
    \nif<\/span> (<\/span>fcntl<\/span>(<\/span>fd,<\/span> F_SETFL,<\/span> flags)<\/span> <<\/span> 0<\/span>)<\/span> return<\/span> –<\/span>1<\/span>;<\/span>
    \nreturn<\/span> 0<\/span>;<\/span>
    \n}<\/span><\/p>\n

    static<\/span> int<\/span> ntySetReUseAddr<\/span>(<\/span>int<\/span> fd)<\/span> {<\/span>
    \nint<\/span> reuse =<\/span> 1<\/span>;<\/span>
    \nreturn<\/span> setsockopt<\/span>(<\/span>fd,<\/span> SOL_SOCKET,<\/span> SO_REUSEADDR,<\/span> (<\/span>char<\/span> *<\/span>)<\/span>&<\/span>reuse,<\/span> sizeof<\/span>(<\/span>reuse)<\/span>)<\/span>;<\/span>
    \n}<\/span><\/p>\n

    int<\/span> main<\/span>(<\/span>int<\/span> argc,<\/span> char<\/span> *<\/span>*<\/span>argv)<\/span> {<\/span>
    \nif<\/span> (<\/span>argc <=<\/span> 2<\/span>)<\/span> {<\/span>
    \nprintf<\/span>(<\/span>"Usage: %s ip port\\\\n"<\/span>,<\/span> argv[<\/span>0<\/span>]<\/span>)<\/span>;<\/span>
    \nexit<\/span>(<\/span>0<\/span>)<\/span>;<\/span>
    \n}<\/span><\/p>\n

    const<\/span> char<\/span> *<\/span>ip =<\/span> argv[<\/span>1<\/span>]<\/span>;<\/span>
    \nint<\/span> port =<\/span> atoi<\/span>(<\/span>argv[<\/span>2<\/span>]<\/span>)<\/span>;<\/span>
    \nint<\/span> connections =<\/span> 0<\/span>;<\/span>
    \nchar<\/span> buffer[<\/span>128<\/span>]<\/span> =<\/span> {<\/span>0<\/span>}<\/span>;<\/span>
    \nint<\/span> i =<\/span> 0<\/span>,<\/span> index =<\/span> 0<\/span>;<\/span><\/p>\n

    struct<\/span> epoll_event<\/span> events[<\/span>MAX_EPOLLSIZE]<\/span>;<\/span><\/p>\n

    int<\/span> epoll_fd =<\/span> epoll_create<\/span>(<\/span>MAX_EPOLLSIZE)<\/span>;<\/span><\/p>\n

    strcpy<\/span>(<\/span>buffer,<\/span> " Data From MulClient\\\\n"<\/span>)<\/span>;<\/span><\/p>\n

    struct<\/span> sockaddr_in<\/span> addr;<\/span>
    \nmemset<\/span>(<\/span>&<\/span>addr,<\/span> 0<\/span>,<\/span> sizeof<\/span>(<\/span>struct<\/span> sockaddr_in<\/span>)<\/span>)<\/span>;<\/span><\/p>\n

    addr.<\/span>sin_family =<\/span> AF_INET;<\/span>
    \naddr.<\/span>sin_addr.<\/span>s_addr =<\/span> inet_addr<\/span>(<\/span>ip)<\/span>;<\/span><\/p>\n

    struct<\/span> timeval<\/span> tv_begin;<\/span>
    \ngettimeofday<\/span>(<\/span>&<\/span>tv_begin,<\/span> NULL<\/span>)<\/span>;<\/span>
    \nint<\/span> sockfd =<\/span> 0<\/span>;<\/span><\/p>\n

    while<\/span> (<\/span>1<\/span>)<\/span> {<\/span>
    \nif<\/span> (<\/span>++<\/span>index >=<\/span> MAX_PORT)<\/span> index =<\/span> 0<\/span>;<\/span><\/p>\n

    struct<\/span> epoll_event<\/span> ev;<\/span><\/p>\n

    if<\/span> (<\/span>connections <<\/span> 340000<\/span> &&<\/span> !<\/span>isContinue)<\/span> {<\/span>
    \nsockfd =<\/span> socket<\/span>(<\/span>AF_INET,<\/span> SOCK_STREAM,<\/span> 0<\/span>)<\/span>;<\/span>
    \nif<\/span> (<\/span>sockfd ==<\/span> –<\/span>1<\/span>)<\/span> {<\/span>
    \nperror<\/span>(<\/span>"socket"<\/span>)<\/span>;<\/span>
    \ngoto<\/span> err;<\/span>
    \n}<\/span><\/p>\n

    \/\/ntySetReUseAddr(sockfd);<\/span>
    \naddr.<\/span>sin_port =<\/span> htons<\/span>(<\/span>port+<\/span>index)<\/span>;<\/span><\/p>\n

    if<\/span> (<\/span>connect<\/span>(<\/span>sockfd,<\/span> (<\/span>struct<\/span> sockaddr<\/span>*<\/span>)<\/span>&<\/span>addr,<\/span> sizeof<\/span>(<\/span>struct<\/span> sockaddr_in<\/span>)<\/span>)<\/span> <<\/span> 0<\/span>)<\/span> {<\/span>
    \nperror<\/span>(<\/span>"connect"<\/span>)<\/span>;<\/span>
    \ngoto<\/span> err;<\/span>
    \n}<\/span>
    \nntySetNonblock<\/span>(<\/span>sockfd)<\/span>;<\/span>
    \nntySetReUseAddr<\/span>(<\/span>sockfd)<\/span>;<\/span><\/p>\n

    sprintf<\/span>(<\/span>buffer,<\/span> "Hello Server: client –> %d\\\\n"<\/span>,<\/span> connections)<\/span>;<\/span>
    \nsend<\/span>(<\/span>sockfd,<\/span> buffer,<\/span> strlen<\/span>(<\/span>buffer)<\/span>,<\/span> 0<\/span>)<\/span>;<\/span><\/p>\n

    ev.<\/span>data.<\/span>fd =<\/span> sockfd;<\/span>
    \nev.<\/span>events =<\/span> EPOLLIN |<\/span> EPOLLOUT;<\/span>
    \nepoll_ctl<\/span>(<\/span>epoll_fd,<\/span> EPOLL_CTL_ADD,<\/span> sockfd,<\/span> &<\/span>ev)<\/span>;<\/span><\/p>\n

    connections ++<\/span>;<\/span>
    \n}<\/span>
    \n\/\/connections ++;<\/span>
    \nif<\/span> (<\/span>connections %<\/span> 1000<\/span> ==<\/span> 999<\/span> ||<\/span> connections >=<\/span> 340000<\/span>)<\/span> {<\/span>
    \nstruct<\/span> timeval<\/span> tv_cur;<\/span>
    \nmemcpy<\/span>(<\/span>&<\/span>tv_cur,<\/span> &<\/span>tv_begin,<\/span> sizeof<\/span>(<\/span>struct<\/span> timeval<\/span>)<\/span>)<\/span>;<\/span><\/p>\n

    gettimeofday<\/span>(<\/span>&<\/span>tv_begin,<\/span> NULL<\/span>)<\/span>;<\/span><\/p>\n

    int<\/span> time_used =<\/span> TIME_SUB_MS<\/span>(<\/span>tv_begin,<\/span> tv_cur)<\/span>;<\/span>
    \nprintf<\/span>(<\/span>"connections: %d, sockfd:%d, time_used:%d\\\\n"<\/span>,<\/span> connections,<\/span> sockfd,<\/span> time_used)<\/span>;<\/span><\/p>\n

    int<\/span> nfds =<\/span> epoll_wait<\/span>(<\/span>epoll_fd,<\/span> events,<\/span> connections,<\/span> 100<\/span>)<\/span>;<\/span>
    \nfor<\/span> (<\/span>i =<\/span> 0<\/span>;<\/span>i <<\/span> nfds;<\/span>i ++<\/span>)<\/span> {<\/span>
    \nint<\/span> clientfd =<\/span> events[<\/span>i]<\/span>.<\/span>data.<\/span>fd;<\/span><\/p>\n

    if<\/span> (<\/span>events[<\/span>i]<\/span>.<\/span>events &<\/span> EPOLLOUT)<\/span> {<\/span>
    \n\/\/sprintf(buffer, "data from %d\\\\n", clientfd);<\/span>
    \nsend<\/span>(<\/span>sockfd,<\/span> buffer,<\/span> strlen<\/span>(<\/span>buffer)<\/span>,<\/span> 0<\/span>)<\/span>;<\/span>
    \n}<\/span> else<\/span> if<\/span> (<\/span>events[<\/span>i]<\/span>.<\/span>events &<\/span> EPOLLIN)<\/span> {<\/span>
    \nchar<\/span> rBuffer[<\/span>MAX_BUFFER]<\/span> =<\/span> {<\/span>0<\/span>}<\/span>;<\/span>
    \nssize_t<\/span> length =<\/span> recv<\/span>(<\/span>sockfd,<\/span> rBuffer,<\/span> MAX_BUFFER,<\/span> 0<\/span>)<\/span>;<\/span>
    \nif<\/span> (<\/span>length ><\/span> 0<\/span>)<\/span> {<\/span>
    \n\/\/printf(" RecvBuffer:%s\\\\n", rBuffer);<\/span><\/p>\n

    if<\/span> (<\/span>!<\/span>strcmp<\/span>(<\/span>rBuffer,<\/span> "quit"<\/span>)<\/span>)<\/span> {<\/span>
    \nisContinue =<\/span> 0<\/span>;<\/span>
    \n}<\/span><\/p>\n

    }<\/span> else<\/span> if<\/span> (<\/span>length ==<\/span> 0<\/span>)<\/span> {<\/span>
    \nprintf<\/span>(<\/span>" Disconnect clientfd:%d\\\\n"<\/span>,<\/span> clientfd)<\/span>;<\/span>
    \nconnections —<\/span>;<\/span>
    \nclose<\/span>(<\/span>clientfd)<\/span>;<\/span>
    \n}<\/span> else<\/span> {<\/span>
    \nif<\/span> (<\/span>errno ==<\/span> EINTR ||<\/span> errno ==<\/span> EAGAIN ||<\/span> errno ==<\/span> ENOTSOCK)<\/span> continue<\/span>;<\/span><\/p>\n

    printf<\/span>(<\/span>" Error clientfd:%d, errno:%d\\\\n"<\/span>,<\/span> clientfd,<\/span> errno)<\/span>;<\/span>
    \nclose<\/span>(<\/span>clientfd)<\/span>;<\/span>
    \n}<\/span>
    \n}<\/span> else<\/span> {<\/span>
    \nprintf<\/span>(<\/span>" clientfd:%d, errno:%d\\\\n"<\/span>,<\/span> clientfd,<\/span> errno)<\/span>;<\/span>
    \nclose<\/span>(<\/span>clientfd)<\/span>;<\/span>
    \n}<\/span>
    \n}<\/span>
    \n}<\/span><\/p>\n

    usleep<\/span>(<\/span>500<\/span>)<\/span>;<\/span>
    \n}<\/span><\/p>\n

    return<\/span> 0<\/span>;<\/span><\/p>\n

    err:<\/span>
    \nprintf<\/span>(<\/span>"error : %s\\\\n"<\/span>,<\/span> strerror<\/span>(<\/span>errno)<\/span>)<\/span>;<\/span>
    \nreturn<\/span> 0<\/span>;<\/span><\/p>\n

    }<\/span><\/p>\n

    \u200b<\/p>\n

    \u7b2c\u4e00\u6b21\u8fd0\u884c<\/h3>\n

    \u51fa\u73b0too many open files\u95ee\u9898<\/h4>\n

    \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

    \u5de6\u8fb9\u662f\u4e00\u4e2a\u670d\u52a1\u5668，\u53f3\u8fb9\u662f\u4e09\u4e2a\u5ba2\u6237\u7aef，\u53ef\u4ee5\u770b\u51fa，\u5f53\u8fde\u63a5\u6570\u8d85\u8fc71024\u65f6，\u51fa\u73b0\u4e86\u9519\u8bef：too many open files\u3002<\/p>\n

    \u89e3\u51b3\u65b9\u6cd5<\/h4>\n

    \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \u5ba2\u6237\u7aef\u952e\u5165ulimit -a\u540e，\u663e\u793aopen files：1024，\u952e\u5165ulimit -n 1048576\u5c06open files\u6539\u4e3a1048576，\u4e0d\u4ec5\u5ba2\u6237\u7aef\u8981\u4fee\u6539，\u670d\u52a1\u7aef\u4e5f\u8981\u4fee\u6539\u3002<\/p>\n

    \u7b2c\u4e8c\u6b21\u8fd0\u884c<\/h3>\n

    reactor.c\u7f16\u8bd1\u4e0d\u901a\u8fc7<\/h4>\n

    \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \u53ef\u4ee5\u660e\u663e\u770b\u51fa，\u4ee3\u7801\u4e2dstruct conn conn_list[CONNECTION_SIZE] = {0}\u5b9a\u4e49\u4e86\u4e00\u4e2a\u975e\u5e38\u5927\u7684\u5168\u5c40（\u9759\u6001）\u6570\u7ec4\u6216\u8005\u7ed3\u6784\u4f53\u6570\u7ec4，\u8fd9\u4f1a\u5728\u5168\u5c40\u6570\u636e\u6bb5（\u9759\u6001\u533a\/BSS\u6bb5）\u5206\u914d\u4e00\u5927\u5757\u5185\u5b58，\u6bd4\u5982\u4e0a\u767e\u4e07\u4e2a\u7ed3\u6784\u4f53，\u6bcf\u4e2a2KB\u5de6\u53f3，\u603b\u5171\u4f1a\u5360\u75282GB\u751a\u81f3\u66f4\u591a\u7684\u7a7a\u95f4\u3002\u7f16\u8bd1\u5668\/\u94fe\u63a5\u5668（\u5c24\u5176\u662fld）\u5bf9\u5355\u4e2a\u5168\u5c40\u53d8\u91cf\u7684\u5927\u5c0f\u6709\u9650\u5236，\u901a\u5e382GB\u5de6\u53f3，\u8d85\u51fa\u5c31\u4f1a\u62a5\u9519\u3002\u4e0b\u9762\u5c1d\u8bd5\u901a\u8fc7molloc\u7684\u65b9\u6cd5\u6765\u89e3\u51b3\u3002malloc\u662f C \u8bed\u8a00\u4e2d\u7528\u6765\u201c\u5411\u64cd\u4f5c\u7cfb\u7edf\u7533\u8bf7\u4e00\u5757\u5185\u5b58\u201d\u7684\u51fd\u6570，\u82f1\u6587\u5168\u79f0\u662f Memory Allocation（\u5206\u914d\u5185\u5b58），\u7528\u6cd5\u662fmalloc（\u60f3\u8981\u7684\u5b57\u8282\u6570），\u7533\u8bf7\u5230\u7684\u5185\u5b58\u662f\u201c\u5806\u201d\u4e0a\u7684\u5185\u5b58，\u53ef\u4ee5\u968f\u4fbf\u7528\u3001\u7528\u5b8c\u8fd8\u53ef\u4ee5\u5f52\u8fd8，\u8fd4\u56de\u7684\u662f\u201c\u65b0\u5206\u914d\u7684\u5185\u5b58\u7684\u9996\u5730\u5740\u201d\u3002<\/p>\n

    \u89e3\u51b3\u65b9\u6cd5<\/h4>\n

    \u670d\u52a1\u7aef\u952e\u5165gcc -o reactor reactor.c -mcmodel=medium\u3002<\/p>\n

    \u8fd9\u662fGCC\u5728x86_64（64\u4f4d）\u67b6\u6784\u4e0b\u7684\u4e00\u4e2a\u5185\u5b58\u6a21\u578b\u53c2\u6570，\u5b83\u8c03\u6574\u4e86\u7f16\u8bd1\u5668\u5bf9\u9759\u6001\u6570\u636e\u6bb5（BSS\/Data\u6bb5）\u7684\u5bfb\u5740\u65b9\u5f0f，\u53ef\u4ee5\u652f\u6301\u6bd4\u9ed8\u8ba4\u66f4\u5927\u7684\u5168\u5c40\u53d8\u91cf\u3002x86_64\u5e73\u53f0\u6709\u4e0d\u540c\u7684\u5185\u5b58\u6a21\u578b，-mcmodel=medium\u8ba9\u5168\u5c40\u548c\u9759\u6001\u53d8\u91cf\u5bfb\u5740\u7a7a\u95f4\u53d8\u5927，\u5141\u8bb8\u4f60\u5206\u914d\u6bd4\u9ed8\u8ba4\u66f4\u5927\u7684\u9759\u6001\u5168\u5c40\u6570\u636e（\u6bd4\u5982\u5927\u4e8e2GB）\u3002\u9ed8\u8ba4\u662f-mcmodel=small，\u5168\u5c40\u9759\u6001\u53d8\u91cf\u5bfb\u5740\u6709\u9650（\u4e00\u822c\u6700\u59272GB）\u3002\u7528-mcmodel=medium，\u5168\u5c40\u9759\u6001\u6570\u636e\u53ef\u4ee5\u5f88\u5927（\u53ea\u8981\u7269\u7406\u5185\u5b58\u548c\u865a\u62df\u5730\u5740\u7a7a\u95f4\u652f\u6301）<\/p>\n

    \u7b2c\u4e09\u6b21\u8fd0\u884c<\/h3>\n

    \u51fa\u73b0\u5ba2\u6237\u7aef\u672c\u5730\u7aef\u53e3\u8017\u5c3d\u7684\u95ee\u9898<\/h4>\n

    \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

    \u5355\u4e2a\u7aef\u53e3（\u5982\u670d\u52a1\u5668\u76842000\u7aef\u53e3）\u7406\u8bba\u4e0a\u53ef\u4ee5\u540c\u65f6\u652f\u6301\u6210\u5343\u4e0a\u4e07\u4e2a\u8fde\u63a5，\u5b9e\u9645\u80fd\u5efa\u7acb\u591a\u5c11\u8fde\u63a5\u53d6\u51b3\u4e8e\u64cd\u4f5c\u7cfb\u7edf\u7684\u8d44\u6e90\u9650\u5236，\u6bd4\u5982\u6587\u4ef6\u63cf\u8ff0\u7b26\u6570\u91cf\u3001TCP\u672c\u5730\u7aef\u53e3\u53ef\u7528\u8303\u56f4\u7b49\u3002\u5f53\u51fa\u73b0\u2018Cannot assign requested address\u2019\u7b49\u9519\u8bef\u65f6，\u5f80\u5f80\u662f\u5ba2\u6237\u7aef\u672c\u5730\u7aef\u53e3\u6216\u5176\u5b83\u8d44\u6e90\u8017\u5c3d\u4e86，\u800c\u4e0d\u662f\u670d\u52a1\u5668\u7aef\u53e3\u672c\u8eab\u7684\u9650\u5236\u3002 \u6b64\u5916，\u56e0\u4e3a\u6bcf\u6761\u6253\u5370\u8fc7\u4e8e\u8017\u65f6，\u6240\u4ee5\u6bcf\u4e00\u5343\u4e2a\u8fde\u63a5\u6253\u5370\u4e00\u6761\u4fe1\u606f\u4ee5\u53ca\u5176\u6240\u8017\u7684\u65f6\u95f4\u3002<\/p>\n

    \u89e3\u51b3\u65b9\u6cd5<\/h4>\n

    \u628a\u670d\u52a1\u5668\u7684\u7aef\u53e3\u4ece\u4e00\u4e2a（2000）\u589e\u52a0\u523020\u4e2a\u3002<\/p>\n

    reactor.c\u4ee3\u7801<\/h4>\n

    \u200b
    \n#<\/span>include<\/span> <errno.h><\/span><\/span>
    \n#<\/span>include<\/span> <stdio.h><\/span><\/span>
    \n#<\/span>include<\/span> <sys\/socket.h><\/span><\/span>
    \n#<\/span>include<\/span> <netinet\/in.h><\/span><\/span>
    \n#<\/span>include<\/span> <string.h><\/span><\/span>
    \n#<\/span>include<\/span> <pthread.h><\/span><\/span>
    \n#<\/span>include<\/span> <unistd.h><\/span><\/span>
    \n#<\/span>include<\/span> <poll.h><\/span><\/span>
    \n#<\/span>include<\/span> <sys\/epoll.h><\/span><\/span>
    \n#<\/span>include<\/span> <errno.h><\/span><\/span>
    \n#<\/span>include<\/span> <sys\/time.h><\/span><\/span><\/p>\n

    #<\/span>define<\/span> BUFFER_LENGTH<\/span> 1024<\/span><\/span><\/span>
    \n#<\/span>define<\/span> CONNECTION_SIZE<\/span> 1048576<\/span><\/span><\/span><\/p>\n

    #<\/span>define<\/span> MAX_PORTS<\/span> 20<\/span><\/span><\/span><\/p>\n

    #<\/span>define<\/span> TIME_SUB_MS<\/span>(<\/span>tv1,<\/span> tv2)<\/span> (<\/span>(<\/span>tv1.<\/span>tv_sec –<\/span> tv2.<\/span>tv_sec)<\/span> *<\/span> 1000<\/span> +<\/span> (<\/span>tv1.<\/span>tv_usec –<\/span> tv2.<\/span>tv_usec)<\/span> \/<\/span> 1000<\/span>)<\/span><\/span><\/span><\/p>\n

    typedef<\/span> int<\/span> (<\/span>*<\/span>RCALLBACK)<\/span>(<\/span>int<\/span> fd)<\/span>;<\/span><\/p>\n

    int<\/span> accept_cb<\/span>(<\/span>int<\/span> fd)<\/span>;<\/span><\/p>\n

    int<\/span> recv_cb<\/span>(<\/span>int<\/span> fd)<\/span>;<\/span><\/p>\n

    int<\/span> send_cb<\/span>(<\/span>int<\/span> fd)<\/span>;<\/span><\/p>\n

    int<\/span> epfd =<\/span> 0<\/span>;<\/span><\/p>\n

    struct<\/span> timeval<\/span> begin;<\/span><\/p>\n

    struct<\/span> conn<\/span> {<\/span>
    \nint<\/span> fd;<\/span><\/p>\n

    char<\/span> rbuffer[<\/span>BUFFER_LENGTH]<\/span>;<\/span>
    \nint<\/span> rlength;<\/span><\/p>\n

    char<\/span> wbuffer[<\/span>BUFFER_LENGTH]<\/span>;<\/span>
    \nint<\/span> wlength;<\/span><\/p>\n

    RCALLBACK send_callback;<\/span><\/p>\n

    union<\/span> {<\/span>
    \nRCALLBACK recv_callback;<\/span>
    \nRCALLBACK accept_callback;<\/span>
    \n}<\/span>r_action;<\/span>
    \n}<\/span>;<\/span><\/p>\n

    struct<\/span> conn<\/span> conn_list[<\/span>CONNECTION_SIZE]<\/span> =<\/span> {<\/span>0<\/span>}<\/span>;<\/span><\/p>\n

    int<\/span> set_event<\/span>(<\/span>int<\/span> fd,<\/span> int<\/span> event,<\/span> int<\/span> flag)<\/span> {<\/span><\/p>\n

    if<\/span> (<\/span>flag)<\/span> {<\/span><\/p>\n

    struct<\/span> epoll_event<\/span> ev;<\/span>
    \nev.<\/span>events =<\/span> event;<\/span>
    \nev.<\/span>data.<\/span>fd =<\/span> fd;<\/span>
    \nepoll_ctl<\/span>(<\/span>epfd,<\/span> EPOLL_CTL_ADD,<\/span> fd,<\/span> &<\/span>ev)<\/span>;<\/span><\/p>\n

    }<\/span> else<\/span> {<\/span><\/p>\n

    struct<\/span> epoll_event<\/span> ev;<\/span>
    \nev.<\/span>events =<\/span> event;<\/span>
    \nev.<\/span>data.<\/span>fd =<\/span> fd;<\/span>
    \nepoll_ctl<\/span>(<\/span>epfd,<\/span> EPOLL_CTL_MOD,<\/span> fd,<\/span> &<\/span>ev)<\/span>;<\/span><\/p>\n

    }<\/span><\/p>\n

    }<\/span><\/p>\n

    int<\/span> event_register<\/span>(<\/span>int<\/span> fd,<\/span> int<\/span> event)<\/span> {<\/span><\/p>\n

    if<\/span> (<\/span>fd <<\/span> 0<\/span>)<\/span>return<\/span> –<\/span>1<\/span>;<\/span><\/p>\n

    conn_list[<\/span>fd]<\/span>.<\/span>fd =<\/span> fd;<\/span>
    \nconn_list[<\/span>fd]<\/span>.<\/span>r_action.<\/span>recv_callback =<\/span> recv_cb;<\/span>
    \nconn_list[<\/span>fd]<\/span>.<\/span>send_callback =<\/span> send_cb;<\/span><\/p>\n

    memset<\/span>(<\/span>conn_list[<\/span>fd]<\/span>.<\/span>rbuffer,<\/span> 0<\/span>,<\/span> BUFFER_LENGTH)<\/span>;<\/span>
    \nconn_list[<\/span>fd]<\/span>.<\/span>rlength =<\/span> 0<\/span>;<\/span><\/p>\n

    memset<\/span>(<\/span>conn_list[<\/span>fd]<\/span>.<\/span>wbuffer,<\/span> 0<\/span>,<\/span> BUFFER_LENGTH)<\/span>;<\/span>
    \nconn_list[<\/span>fd]<\/span>.<\/span>wlength =<\/span> 0<\/span>;<\/span><\/p>\n

    set_event<\/span>(<\/span>fd,<\/span>event,<\/span>1<\/span>)<\/span>;<\/span><\/p>\n

    }<\/span><\/p>\n

    int<\/span> accept_cb<\/span>(<\/span>int<\/span> fd)<\/span> {<\/span><\/p>\n

    struct<\/span> sockaddr_in<\/span> clientaddr;<\/span>
    \nsocklen_t<\/span> len =<\/span> sizeof<\/span>(<\/span>clientaddr)<\/span>;<\/span><\/p>\n

    int<\/span> clientfd =<\/span> accept<\/span>(<\/span>fd,<\/span> (<\/span>struct<\/span> sockaddr<\/span>*<\/span>)<\/span>&<\/span>clientaddr,<\/span> &<\/span>len)<\/span>;<\/span>
    \n\/\/printf("accept finished:%d\\\\n", clientfd);<\/span><\/p>\n

    if<\/span> (<\/span>clientfd <<\/span> 0<\/span>)<\/span> {<\/span>
    \nprintf<\/span>(<\/span>"accept errno: %d –> %s\\\\n"<\/span>,<\/span> errno,<\/span> strerror<\/span>(<\/span>errno)<\/span>)<\/span>;<\/span>
    \nreturn<\/span> –<\/span>1<\/span>;<\/span>
    \n}<\/span><\/p>\n

    event_register<\/span>(<\/span>clientfd,<\/span> EPOLLIN)<\/span>;<\/span><\/p>\n

    if<\/span> (<\/span>(<\/span>clientfd %<\/span> 1000<\/span>)<\/span> ==<\/span> 0<\/span>)<\/span> {<\/span><\/p>\n

    struct<\/span> timeval<\/span> current;<\/span>
    \ngettimeofday<\/span>(<\/span>&<\/span>current,<\/span> NULL<\/span>)<\/span>;<\/span><\/p>\n

    int<\/span> time_used =<\/span> TIME_SUB_MS<\/span>(<\/span>current,<\/span> begin)<\/span>;<\/span>
    \nmemcpy<\/span>(<\/span>&<\/span>begin,<\/span> &<\/span>current,<\/span> sizeof<\/span>(<\/span>struct<\/span> timeval<\/span>)<\/span>)<\/span>;<\/span><\/p>\n

    printf<\/span>(<\/span>"accept finished: %d, time_used: %d\\\\n"<\/span>,<\/span> clientfd,<\/span> time_used)<\/span>;<\/span><\/p>\n

    }<\/span><\/p>\n

    return<\/span> 0<\/span>;<\/span><\/p>\n

    }<\/span><\/p>\n

    int<\/span> recv_cb<\/span>(<\/span>int<\/span> fd)<\/span> {<\/span><\/p>\n

    int<\/span> count =<\/span> recv<\/span>(<\/span>fd,<\/span> conn_list[<\/span>fd]<\/span>.<\/span>rbuffer,<\/span> BUFFER_LENGTH,<\/span> 0<\/span>)<\/span>;<\/span><\/p>\n

    if<\/span> (<\/span>count ==<\/span> 0<\/span>)<\/span> {<\/span>
    \nprintf<\/span>(<\/span>"client disconnect: %d\\\\n"<\/span>,<\/span> fd)<\/span>;<\/span>
    \nclose<\/span>(<\/span>fd)<\/span>;<\/span><\/p>\n

    epoll_ctl<\/span>(<\/span>epfd,<\/span> EPOLL_CTL_DEL,<\/span> fd,<\/span> NULL<\/span>)<\/span>;<\/span> \/\/unfinished<\/span><\/p>\n

    return<\/span> 0<\/span>;<\/span>
    \n}<\/span>
    \nconn_list[<\/span>fd]<\/span>.<\/span>rlength =<\/span> count;<\/span><\/p>\n

    \/\/printf("RECV: %s\\\\n", conn_list[fd].rbuffer);<\/span><\/p>\n

    #<\/span>if<\/span> 1<\/span><\/span><\/span><\/p>\n

    conn_list[<\/span>fd]<\/span>.<\/span>wlength =<\/span> conn_list[<\/span>fd]<\/span>.<\/span>rlength;<\/span>
    \nmemcpy<\/span>(<\/span>conn_list[<\/span>fd]<\/span>.<\/span>wbuffer,<\/span> conn_list[<\/span>fd]<\/span>.<\/span>rbuffer,<\/span> conn_list[<\/span>fd]<\/span>.<\/span>wlength)<\/span>;<\/span><\/p>\n

    #<\/span>endif<\/span><\/span><\/p>\n

    set_event<\/span>(<\/span>fd,<\/span> EPOLLOUT,<\/span> 0<\/span>)<\/span>;<\/span><\/p>\n

    return<\/span> count;<\/span><\/p>\n

    }<\/span><\/p>\n

    int<\/span> send_cb<\/span>(<\/span>int<\/span> fd)<\/span> {<\/span><\/p>\n

    int<\/span> count =<\/span> send<\/span>(<\/span>fd,<\/span> conn_list[<\/span>fd]<\/span>.<\/span>wbuffer,<\/span> conn_list[<\/span>fd]<\/span>.<\/span>wlength,<\/span> 0<\/span>)<\/span>;<\/span><\/p>\n

    set_event<\/span>(<\/span>fd,<\/span> EPOLLIN,<\/span> 0<\/span>)<\/span>;<\/span><\/p>\n

    return<\/span> count;<\/span>
    \n}<\/span><\/p>\n

    int<\/span> init_server<\/span>(<\/span>unsigned<\/span> short<\/span> port)<\/span> {<\/span><\/p>\n

    int<\/span> sockfd =<\/span> socket<\/span>(<\/span>AF_INET,<\/span> SOCK_STREAM,<\/span> 0<\/span>)<\/span>;<\/span><\/p>\n

    struct<\/span> sockaddr_in<\/span> servaddr;<\/span>
    \nservaddr.<\/span>sin_family =<\/span> AF_INET;<\/span>
    \nservaddr.<\/span>sin_addr.<\/span>s_addr =<\/span> htonl<\/span>(<\/span>INADDR_ANY)<\/span>;<\/span> \/\/0.0.0<\/span>
    \nservaddr.<\/span>sin_port =<\/span> htons<\/span>(<\/span>port)<\/span>;<\/span> \/\/0-1023<\/span><\/p>\n

    if<\/span> (<\/span>–<\/span>1<\/span> ==<\/span> bind<\/span>(<\/span>sockfd,<\/span> (<\/span>struct<\/span> sockaddr<\/span>*<\/span>)<\/span>&<\/span>servaddr,<\/span> sizeof<\/span> (<\/span>struct<\/span> sockaddr<\/span>)<\/span>)<\/span>)<\/span> {<\/span>
    \nprintf<\/span>(<\/span>"bind failed: %s\\\\n"<\/span>,<\/span> strerror<\/span>(<\/span>errno)<\/span>)<\/span>;<\/span>
    \n}<\/span><\/p>\n

    listen<\/span>(<\/span>sockfd,<\/span> 10<\/span>)<\/span>;<\/span>
    \n\/\/printf("listen finished:%d\\\\n", sockfd);<\/span><\/p>\n

    return<\/span> sockfd;<\/span>
    \n}<\/span><\/p>\n

    int<\/span> main<\/span>(<\/span>)<\/span> {<\/span><\/p>\n

    unsigned<\/span> short<\/span> port =<\/span> 2000<\/span>;<\/span><\/p>\n

    epfd =<\/span> epoll_create<\/span>(<\/span>1<\/span>)<\/span>;<\/span><\/p>\n

    int<\/span> i =<\/span> 0<\/span>;<\/span><\/p>\n

    for<\/span> (<\/span>i =<\/span> 0<\/span>;<\/span>i <<\/span> MAX_PORTS;<\/span>i ++<\/span>)<\/span> {<\/span><\/p>\n

    int<\/span> sockfd =<\/span> init_server<\/span>(<\/span>port +<\/span> i)<\/span>;<\/span><\/p>\n

    conn_list[<\/span>sockfd]<\/span>.<\/span>fd =<\/span> sockfd;<\/span>
    \nconn_list[<\/span>sockfd]<\/span>.<\/span>r_action.<\/span>recv_callback =<\/span> accept_cb;<\/span><\/p>\n

    set_event<\/span>(<\/span>sockfd,<\/span> EPOLLIN,<\/span> 1<\/span>)<\/span>;<\/span>
    \n}<\/span><\/p>\n

    gettimeofday<\/span>(<\/span>&<\/span>begin,<\/span> NULL<\/span>)<\/span>;<\/span><\/p>\n

    while<\/span> (<\/span>1<\/span>)<\/span> {<\/span> \/\/mainloop<\/span><\/p>\n

    struct<\/span> epoll_event<\/span> events[<\/span>1024<\/span>]<\/span> =<\/span> {<\/span>0<\/span>}<\/span>;<\/span>
    \nint<\/span> nready =<\/span> epoll_wait<\/span>(<\/span>epfd,<\/span> events,<\/span> 1024<\/span>,<\/span> –<\/span>1<\/span>)<\/span>;<\/span><\/p>\n

    int<\/span> i =<\/span> 0<\/span>;<\/span>
    \nfor<\/span> (<\/span>i =<\/span> 0<\/span>;<\/span>i <<\/span> nready;<\/span>i ++<\/span>)<\/span> {<\/span><\/p>\n

    int<\/span> connfd =<\/span> events[<\/span>i]<\/span>.<\/span>data.<\/span>fd;<\/span><\/p>\n

    if<\/span> (<\/span>events[<\/span>i]<\/span>.<\/span>events &<\/span> EPOLLIN)<\/span> {<\/span>
    \nconn_list[<\/span>connfd]<\/span>.<\/span>r_action.<\/span>recv_callback<\/span>(<\/span>connfd)<\/span>;<\/span>
    \n}<\/span><\/p>\n

    if<\/span> (<\/span>events[<\/span>i]<\/span>.<\/span>events &<\/span> EPOLLOUT)<\/span> {<\/span>
    \nconn_list[<\/span>connfd]<\/span>.<\/span>send_callback<\/span>(<\/span>connfd)<\/span>;<\/span>
    \n}<\/span>
    \n}<\/span><\/p>\n

    }<\/span><\/p>\n

    }<\/span><\/p>\n

    \u200b<\/p>\n

    \u7b2c\u56db\u6b21\u8fd0\u884c<\/h3>\n

    \u5728\u8fd0\u884c\u524d，\u6bcf\u53f0\u865a\u62df\u673a\u952e\u5165sudo vim \/etc\/security\/limits.conf，\u5728\u6587\u4ef6\u5e95\u90e8\u6dfb\u52a0\u5185\u5bb9\u5982\u4e0b\u56fe\u6240\u793a，\u4e2d\u95f4\u7684\u7a7a\u662ftab\u952e，\u6ca1\u6709\u7a7a\u683c\u952e\u3002 \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

    \u51fa\u73b0\u5ba2\u6237\u7aef\u8fde\u63a5\u8d85\u65f6\u7684\u95ee\u9898<\/h4>\n

    \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

    \u89e3\u51b3\u65b9\u6cd5（\u6539eth0）<\/h4>\n

    ifconfig\u67e5\u770b\u670d\u52a1\u5668\u865a\u62df\u673a\u7684ip\u5730\u5740，\u7136\u540e\u952e\u5165sudo vim \/etc\/default\/grub ，\u4fee\u6539\u4e3a\u4e0b\u56fe\u4e2d\u7684\u6837\u5b50： \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \u7cfb\u7edf\u7684\u5f15\u5bfc\u52a0\u8f7d\u5668grub\u914d\u7f6e\u6587\u4ef6，GRUB_CMDLINE_LINUX \u53c2\u6570\u88ab\u4fee\u6539\u4e3a"net.ifnames=0 biosdevname=0"，\u8fd9\u7981\u7528\u4e86\u65b0\u7684\u7f51\u7edc\u63a5\u53e3\u547d\u540d\u89c4\u5219（\u5982 ens33\u3001enp0s3），\u4f7f\u7528\u4f20\u7edf\u7684\u7f51\u7edc\u63a5\u53e3\u540d\u79f0（\u5982 eth0\u3001eth1）\u3002 \u968f\u540e\u952e\u5165sudo update-grub，\u66f4\u65b0\u540e\u952e\u5165sudo vim \/etc\/netplan\/00-installer-config.yaml ，\u4fee\u6539\u5185\u5bb9\u4e3a\u4e0b\u56fe： \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \u914d\u7f6e\u4e86\u4e00\u4e2a\u540d\u4e3a eth0 \u7684\u7f51\u7edc\u63a5\u53e3，dhcp4: true: \u4f7f\u7528 DHCP \u81ea\u52a8\u83b7\u53d6 IPv4 \u5730\u5740，version: 2: \u4f7f\u7528 Netplan \u914d\u7f6e\u683c\u5f0f\u7248\u672c 2\u3002 \u6700\u540e\u952e\u5165sudo shutdown -h now\u5173\u673a，\u5173\u673a\u540e\u589e\u52a0\u4e00\u4e2a\u7f51\u7edc\u9002\u914d\u5668：NAT\u3002 \u4e00\u5f20\u7f51\u5361\u7528\u4e8eSSH\u8fde\u63a5，\u53e6\u4e00\u5f20\u7f51\u5361\u7528\u4e8e\u8dd1\u767e\u4e07\u670d\u52a1\u5668\u3002<\/p>\n

    \u7b2c\u4e94\u6b21\u8fd0\u884c<\/h3>\n

    \u8fd0\u884c\u6210\u529f<\/h4>\n

    \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \u7ecf\u8fc7\u4e00\u6bb5\u65f6\u95f4\u7684\u7b49\u5f85，\u603b\u8fde\u63a5\u6570\u8dd1\u5230\u4e86102W，\u5b9e\u73b0\u4e86\u767e\u4e07\u5e76\u53d1\u3002<\/p>\n

    \u4e09\u3001\u603b\u7ed3reactor.c\u7684\u6267\u884c\u6d41\u7a0b<\/h2>\n

    \u4ecemain（）\u51fd\u6570\u5165\u624b：<\/p>\n

    unsigned<\/span> short<\/span> port =<\/span> 2000<\/span>;<\/span><\/p>\n

    \u5b9a\u4e49\u4e00\u4e2a\u65e0\u7b26\u53f7\u77ed\u6574\u578b\u7684\u53d8\u91cfport\u7528\u6765\u5b58\u50a8\u7aef\u53e3\u53f72000，\u65e0\u7b26\u53f7（unsigned）\u53ea\u80fd\u8868\u793a0\u548c\u6b63\u6570，\u77ed\u6574\u578b（short）\u53ea\u80fd\u8868\u793a2\u5b57\u8282\u7684\u6574\u6570\u3002<\/p>\n

    epfd =<\/span> epoll_create<\/span>(<\/span>1<\/span>)<\/span>;<\/span><\/p>\n

    \u521b\u5efa\u4e00\u4e2aepoll\u5b9e\u4f8b\u5e76\u8fd4\u56de\u4e00\u4e2a\u7ba1\u7406epoll\u5b9e\u4f8b\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26epfd\u3002<\/p>\n

    int<\/span> i =<\/span> 0<\/span>;<\/span><\/p>\n

    for<\/span> (<\/span>i =<\/span> 0<\/span>;<\/span>i <<\/span> MAX_PORTS;<\/span>i ++<\/span>)<\/span> {<\/span><\/p>\n

    int<\/span> sockfd =<\/span> init_server<\/span>(<\/span>port +<\/span> i)<\/span>;<\/span><\/p>\n

    conn_list[<\/span>sockfd]<\/span>.<\/span>fd =<\/span> sockfd;<\/span>
    \nconn_list[<\/span>sockfd]<\/span>.<\/span>r_action.<\/span>recv_callback =<\/span> accept_cb;<\/span><\/p>\n

    set_event<\/span>(<\/span>sockfd,<\/span> EPOLLIN,<\/span> 1<\/span>)<\/span>;<\/span>
    \n}<\/span><\/p>\n

    \u5bf9\u4e8e\u6bcf\u4e2a\u7aef\u53e3，\u8c03\u7528init_server\u51fd\u6570\u5e76\u8fd4\u56de\u5bf9\u5e94\u7684sockfd，\u4e0b\u9762\u662finit_server\u5bf9\u5e94\u7684\u4ee3\u7801：<\/p>\n

    int<\/span> init_server<\/span>(<\/span>unsigned<\/span> short<\/span> port)<\/span> {<\/span><\/p>\n

    int<\/span> sockfd =<\/span> socket<\/span>(<\/span>AF_INET,<\/span> SOCK_STREAM,<\/span> 0<\/span>)<\/span>;<\/span><\/p>\n

    struct<\/span> sockaddr_in<\/span> servaddr;<\/span>
    \nservaddr.<\/span>sin_family =<\/span> AF_INET;<\/span>
    \nservaddr.<\/span>sin_addr.<\/span>s_addr =<\/span> htonl<\/span>(<\/span>INADDR_ANY)<\/span>;<\/span> \/\/0.0.0<\/span>
    \nservaddr.<\/span>sin_port =<\/span> htons<\/span>(<\/span>port)<\/span>;<\/span> \/\/0-1023<\/span><\/p>\n

    if<\/span> (<\/span>–<\/span>1<\/span> ==<\/span> bind<\/span>(<\/span>sockfd,<\/span> (<\/span>struct<\/span> sockaddr<\/span>*<\/span>)<\/span>&<\/span>servaddr,<\/span> sizeof<\/span> (<\/span>struct<\/span> sockaddr<\/span>)<\/span>)<\/span>
    \n)<\/span> {<\/span>
    \nprintf<\/span>(<\/span>"bind failed: %s\\\\n"<\/span>,<\/span> strerror<\/span>(<\/span>errno)<\/span>)<\/span>;<\/span>
    \n}<\/span><\/p>\n

    listen<\/span>(<\/span>sockfd,<\/span> 10<\/span>)<\/span>;<\/span>
    \n\/\/printf("listen finished:%d\\\\n", sockfd);<\/span><\/p>\n

    return<\/span> sockfd;<\/span>
    \n}<\/span><\/p>\n

    \u5728init_server\u4e2d，\u521b\u5efa\u4e00\u4e2aIPV4 TCP\u5957\u63a5\u5b57，\u8fd4\u56de\u4e00\u4e2asockfd；\u521b\u5efa\u4e00\u4e2a\u7c7b\u578b\u4e3astruct sockaddr_in\u7684\u7ed3\u6784\u4f53\u53d8\u91cfservaddr，\u5c06\u8fd9\u4e2a\u53d8\u91cf\u7684\u5730\u5740\u65cf\u8bbe\u7f6e\u4e3aIPV4，\u670d\u52a1\u5668\u76d1\u542c\u6240\u6709\u7f51\u7edc\u63a5\u53e3\u5e76\u6307\u5b9a\u670d\u52a1\u5668\u76d1\u542c\u7684\u7aef\u53e3\u53f7，\u901a\u8fc7bind()\u5c06\u5957\u63a5\u5b57（socket） \u548c IP\u5730\u5740\u3001\u7aef\u53e3\u53f7 \u7ed1\u5b9a\u5728\u4e00\u8d77，\u901a\u8fc7listen()\u5c06\u5957\u63a5\u5b57\u8bbe\u7f6e\u4e3a\u76d1\u542c\u72b6\u6001，\u51c6\u5907\u63a5\u6536\u5ba2\u6237\u7aef\u7684\u8fde\u63a5\u8bf7\u6c42，\u8fd4\u56desockfd\u3002 \u518d\u56de\u5230main（）\u51fd\u6570\u5f53\u4e2d，\u62ff\u7740\u8fd4\u56de\u7684fd，\u5c06\u7ed3\u6784\u4f53\u6570\u7ec4conn_list\u7684\u7d22\u5f15\u53f7\u4e0e\u8fd4\u56de\u7684sockfd\u7684\u503c\u5bf9\u5e94\u4e0a\u5e76\u4e14\u5c06conn_list\u4e2d\u7684\u6210\u5458\u8054\u5408\u4f53r_action\u4e2d\u7684recv_callback\u51fd\u6570\u6307\u9488\u6307\u5411accept_cb\u51fd\u6570\u7684\u5730\u5740\u3002 \u968f\u540e\u8fdb\u5165\u5230set_event\u51fd\u6570\u4e2d：<\/p>\n

    int<\/span> set_event<\/span>(<\/span>int<\/span> fd,<\/span> int<\/span> event,<\/span> int<\/span> flag)<\/span> {<\/span><\/p>\n

    if<\/span> (<\/span>flag)<\/span> {<\/span><\/p>\n

    struct<\/span> epoll_event<\/span> ev;<\/span>
    \nev.<\/span>events =<\/span> event;<\/span>
    \nev.<\/span>data.<\/span>fd =<\/span> fd;<\/span>
    \nepoll_ctl<\/span>(<\/span>epfd,<\/span> EPOLL_CTL_ADD,<\/span> fd,<\/span> &<\/span>ev)<\/span>;<\/span><\/p>\n

    }<\/span> else<\/span> {<\/span><\/p>\n

    struct<\/span> epoll_event<\/span> ev;<\/span>
    \nev.<\/span>events =<\/span> event;<\/span>
    \nev.<\/span>data.<\/span>fd =<\/span> fd;<\/span>
    \nepoll_ctl<\/span>(<\/span>epfd,<\/span> EPOLL_CTL_MOD,<\/span> fd,<\/span> &<\/span>ev)<\/span>;<\/span><\/p>\n

    }<\/span><\/p>\n

    }<\/span><\/p>\n

    \u5b9a\u4e49\u4e00\u4e2a\u7c7b\u578b\u4e3astruct epoll_event\u7684\u7ed3\u6784\u4f53\u53d8\u91cfev，\u8bbe\u7f6eev\u5f53\u4e2d\u7684\u4e8b\u4ef6\u4ee5\u53ca\u5bf9\u5e94\u7684fd\u5e76\u4e14\u901a\u8fc7epoll_ctl\u5c06\u8fd9\u4e9b\u901a\u8fc7epfd\u6dfb\u52a0epoll\u5b9e\u4f8b\u5f53\u4e2d\u3002 \u56de\u5230main\u51fd\u6570：<\/p>\n

    gettimeofday<\/span>(<\/span>&<\/span>begin,<\/span> NULL<\/span>)<\/span>;<\/span><\/p>\n

    \u83b7\u53d6\u5f53\u524d\u65f6\u95f4\u5e76\u5b58\u50a8\u5230 begin \u53d8\u91cf<\/p>\n

    while<\/span> (<\/span>1<\/span>)<\/span> {<\/span> \/\/mainloop<\/span><\/p>\n

    struct<\/span> epoll_event<\/span> events[<\/span>1024<\/span>]<\/span> =<\/span> {<\/span>0<\/span>}<\/span>;<\/span>
    \nint<\/span> nready =<\/span> epoll_wait<\/span>(<\/span>epfd,<\/span> events,<\/span> 1024<\/span>,<\/span> –<\/span>1<\/span>)<\/span>;<\/span><\/p>\n

    int<\/span> i =<\/span> 0<\/span>;<\/span>
    \nfor<\/span> (<\/span>i =<\/span> 0<\/span>;<\/span>i <<\/span> nready;<\/span>i ++<\/span>)<\/span> {<\/span><\/p>\n

    int<\/span> connfd =<\/span> events[<\/span>i]<\/span>.<\/span>data.<\/span>fd;<\/span><\/p>\n

    if<\/span> (<\/span>events[<\/span>i]<\/span>.<\/span>events &<\/span> EPOLLIN)<\/span> {<\/span>
    \nconn_list[<\/span>connfd]<\/span>.<\/span>r_action.<\/span>recv_callback<\/span>(<\/span>connfd)<\/span>;<\/span>
    \n}<\/span><\/p>\n

    if<\/span> (<\/span>events[<\/span>i]<\/span>.<\/span>events &<\/span> EPOLLOUT)<\/span> {<\/span>
    \nconn_list[<\/span>connfd]<\/span>.<\/span>send_callback<\/span>(<\/span>connfd)<\/span>;<\/span>
    \n}<\/span>
    \n}<\/span><\/p>\n

    }<\/span><\/p>\n

    \u521b\u5efa\u4e00\u4e2a\u7c7b\u578b\u4e3astruct epoll_event\u7684\u7ed3\u6784\u4f53\u53d8\u91cfevents，\u5b9a\u4e49\u4e86\u4e00\u4e2a\u5b58\u50a8\u6700\u591a1024\u4e2a\u4e8b\u4ef6\u7684\u6570\u7ec4，\u5e76\u5c06\u6bcf\u4e2a\u4e8b\u4ef6\u7684\u5b57\u6bb5\u521d\u59cb\u5316\u4e3a0\u3002\u901a\u8fc7epoll_wait\u7b49\u5f85\u6307\u5b9a\u7684 epoll \u5b9e\u4f8b\u4e0a\u7684\u4e8b\u4ef6\u53d1\u751f，\u5c06\u89e6\u53d1\u7684\u4e8b\u4ef6\u6309\u987a\u5e8f\u4ece\u7b2c\u4e00\u4e2a\u5143\u7d20\u5f00\u59cb\u5199\u5165 events \u6570\u7ec4，\u5e76\u8fd4\u56de\u89e6\u53d1\u7684\u4e8b\u4ef6\u6570\u3002for\u5faa\u73af\u904d\u5386\u5df2\u7ecf\u5199\u5165events\u7684\u6240\u6709\u5143\u7d20\u3002\u5bf9\u4e8e\u5faa\u73af\u5185\u90e8，\u5c06\u4e8b\u4ef6\u5bf9\u5e94\u7684fd\u8d4b\u503c\u7ed9connfd，\u5982\u679c\u4e8b\u4ef6\u662f\u53ef\u8bfb，\u6267\u884c\u524d\u9762\u8bbe\u7f6e\u597d\u7684accept_cb，\u4f20\u5165\u53c2\u6570connfd，\u5bf9\u4e8eaccept_cb\u51fd\u6570：<\/p>\n

    int<\/span> accept_cb<\/span>(<\/span>int<\/span> fd)<\/span> {<\/span><\/p>\n

    struct<\/span> sockaddr_in<\/span> clientaddr;<\/span>
    \nsocklen_t<\/span> len =<\/span> sizeof<\/span>(<\/span>clientaddr)<\/span>;<\/span><\/p>\n

    int<\/span> clientfd =<\/span> accept<\/span>(<\/span>fd,<\/span> (<\/span>struct<\/span> sockaddr<\/span>*<\/span>)<\/span>&<\/span>clientaddr,<\/span> &<\/span>len)<\/span>;<\/span>
    \n\/\/printf("accept finished:%d\\\\n", clientfd);<\/span><\/p>\n

    if<\/span> (<\/span>clientfd <<\/span> 0<\/span>)<\/span> {<\/span>
    \nprintf<\/span>(<\/span>"accept errno: %d –> %s\\\\n"<\/span>,<\/span> errno,<\/span> strerror<\/span>(<\/span>errno)<\/span>)<\/span>;<\/span>
    \nreturn<\/span> –<\/span>1<\/span>;<\/span>
    \n}<\/span><\/p>\n

    event_register<\/span>(<\/span>clientfd,<\/span> EPOLLIN)<\/span>;<\/span><\/p>\n

    if<\/span> (<\/span>(<\/span>clientfd %<\/span> 1000<\/span>)<\/span> ==<\/span> 0<\/span>)<\/span> {<\/span><\/p>\n

    struct<\/span> timeval<\/span> current;<\/span>
    \ngettimeofday<\/span>(<\/span>&<\/span>current,<\/span> NULL<\/span>)<\/span>;<\/span><\/p>\n

    int<\/span> time_used =<\/span> TIME_SUB_MS<\/span>(<\/span>current,<\/span> begin)<\/span>;<\/span>
    \nmemcpy<\/span>(<\/span>&<\/span>begin,<\/span> &<\/span>current,<\/span> sizeof<\/span>(<\/span>struct<\/span> timeval<\/span>)<\/span>)<\/span>;<\/span><\/p>\n

    printf<\/span>(<\/span>"accept finished: %d, time_used: %d\\\\n"<\/span>,<\/span> clientfd,<\/span> time_used)<\/span>;<\/span><\/p>\n

    }<\/span><\/p>\n

    return<\/span> 0<\/span>;<\/span><\/p>\n

    }<\/span><\/p>\n

    accept\u5efa\u7acb\u8fde\u63a5\u5e76\u8fd4\u56declientfd，\u8c03\u7528event_register\u5e76\u4f20\u5165\u53c2\u6570clientfd，EPOLLIN:<\/p>\n

    int<\/span> event_register<\/span>(<\/span>int<\/span> fd,<\/span> int<\/span> event)<\/span> {<\/span><\/p>\n

    if<\/span> (<\/span>fd <<\/span> 0<\/span>)<\/span>return<\/span> –<\/span>1<\/span>;<\/span><\/p>\n

    conn_list[<\/span>fd]<\/span>.<\/span>fd =<\/span> fd;<\/span>
    \nconn_list[<\/span>fd]<\/span>.<\/span>r_action.<\/span>recv_callback =<\/span> recv_cb;<\/span>
    \nconn_list[<\/span>fd]<\/span>.<\/span>send_callback =<\/span> send_cb;<\/span><\/p>\n

    memset<\/span>(<\/span>conn_list[<\/span>fd]<\/span>.<\/span>rbuffer,<\/span> 0<\/span>,<\/span> BUFFER_LENGTH)<\/span>;<\/span>
    \nconn_list[<\/span>fd]<\/span>.<\/span>rlength =<\/span> 0<\/span>;<\/span><\/p>\n

    memset<\/span>(<\/span>conn_list[<\/span>fd]<\/span>.<\/span>wbuffer,<\/span> 0<\/span>,<\/span> BUFFER_LENGTH)<\/span>;<\/span>
    \nconn_list[<\/span>fd]<\/span>.<\/span>wlength =<\/span> 0<\/span>;<\/span><\/p>\n

    set_event<\/span>(<\/span>fd,<\/span>event,<\/span>1<\/span>)<\/span>;<\/span><\/p>\n

    }<\/span><\/p>\n

    \u4f9d\u65e7\u662f\u5c06conn_list\u6570\u7ec4\u7684\u7d22\u5f15\u5bf9\u5e94fd，\u5e76\u4e14\u628arecv_callback\u548csend_callback\u51fd\u6570\u6307\u9488\u6307\u5411recv_cb\u51fd\u6570\u548csend_cb\u51fd\u6570\u7684\u5730\u5740，\u6e05\u7a7afd\u5bf9\u5e94\u7684rbuffer\u3001wbuffer\u5e76\u91cd\u7f6erlength\u3001wlength，\u901a\u8fc7set_event\u51fd\u6570\u5c06\u5f15\u5165\u7684fd\u548c\u4e8b\u4ef6\u6dfb\u52a0\u5230epoll\u5b9e\u4f8b\u5f53\u4e2d\u3002 \u56de\u5230accept_cb\u5f53\u4e2d，\u6bcf\u4e00\u5343\u6761\u8fde\u63a5\u6253\u5370\u8fde\u63a5\u6570\u5df2\u7ecf\u8fde\u63a5\u6240\u7528\u7684\u65f6\u95f4\u3002 \u518d\u56de\u5230\u4e3b\u7a0b\u5e8f\u7684while\u5faa\u73af\u5f53\u4e2d，\u5982\u679c\u662f\u53ef\u5199\u4e8b\u4ef6，\u901a\u8fc7\u51fd\u6570\u6307\u9488send_callback\u56de\u8c03\u51fd\u6570send_cb，\u5e76\u4f20\u5165\u53c2\u6570connfd：<\/p>\n

    int<\/span> send_cb<\/span>(<\/span>int<\/span> fd)<\/span> {<\/span><\/p>\n

    int<\/span> count =<\/span> send<\/span>(<\/span>fd,<\/span> conn_list[<\/span>fd]<\/span>.<\/span>wbuffer,<\/span> conn_list[<\/span>fd]<\/span>.<\/span>wlength,<\/span> 0<\/span>)<\/span>;<\/span><\/p>\n

    set_event<\/span>(<\/span>fd,<\/span> EPOLLIN,<\/span> 0<\/span>)<\/span>;<\/span><\/p>\n

    return<\/span> count;<\/span>
    \n}<\/span><\/p>\n

    \u5c06connfd\u5bf9\u5e94\u7684wbuffer\u4e2d\u7684\u957f\u5ea6\u4e3awlength\u7684\u6570\u636e\u53d1\u9001\u5230\u6307\u5b9a\u7684fd\u5f53\u4e2d，\u5e76\u4e14\u8fd4\u56de\u6210\u529f\u53d1\u9001\u7684\u5b57\u8282\u6570count，\u901a\u8fc7sent_event\u5c06\u6b64fd\u7684\u4e8b\u4ef6\u4ece\u53ef\u5199\u6539\u4e3a\u53ef\u8bfb，\u8fd4\u56decount，\u518d\u6b21\u8fd4\u56de\u5230main（）\u51fd\u6570\u91cd\u590d\u6267\u884cwhile\u5faa\u73af\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

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