{"id":1240,"date":"2024-09-30T11:26:22","date_gmt":"2024-09-30T03:26:22","guid":{"rendered":"http:\/\/114.55.108.251\/?p=1240"},"modified":"2025-03-04T09:44:47","modified_gmt":"2025-03-04T01:44:47","slug":"linux%e7%bd%91%e7%bb%9c%e7%bc%96%e7%a8%8b-part3-%e9%ab%98%e5%b9%b6%e5%8f%91%e6%9c%8d%e5%8a%a1%e5%99%a8","status":"publish","type":"post","link":"https:\/\/guapicoding.com\/?p=1240","title":{"rendered":"Linux\u7f51\u7edc\u7f16\u7a0b Part3 \u9ad8\u5e76\u53d1\u670d\u52a1\u5668\u4e4b\u4e00"},"content":{"rendered":"\n

\u591a\u8fdb\u7a0b\u5e76\u53d1\u670d\u52a1\u5668<\/h2>\n\n\n\n

\u601d\u8def <\/h4>\n\n\n\n

\u2460Socket(); \u521b\u5efa\u76d1\u542c\u5957\u63a5\u5b57lfd\uff08\u9996\u5b57\u6bcd\u5927\u5199\u662f\u56e0\u4e3a\u8c03\u7528\u7684\u81ea\u5c01\u88c5\u51fd\u6570\uff09<\/p>\n\n\n\n

\u2461Bind(); \u7ed1\u5b9a\u5730\u5740\u7ed3\u6784 Strcut sockaddr_in addr;<\/p>\n\n\n\n

\u2462Listen(); \u8bbe\u7f6e\u76d1\u542c\u4e0a\u9650<\/p>\n\n\n\n

\u2463<\/p>\n\n\n\n

while (1) {\n    cfd = Accpet(); \/\/\u63a5\u6536\u5ba2\u6237\u7aef\u8fde\u63a5\u8bf7\u6c42 \n    pid = fork();\n    if(pid == 0) { \/\/\u5b50\u8fdb\u7a0bread(cfd)\u2192\u5904\u7406\u6570\u636e\u2192write(cfd)\n        close(lfd); \/\/\u5173\u95ed\u7528\u4e8e\u5efa\u7acb\u8fde\u63a5\u7684\u76d1\u542c\u5957\u63a5\u5b57lfd(\u56e0\u4e3a\u5b50\u8fdb\u7a0b\u7528\u4e0d\u5230)\n        read();\n        \/\/\u5177\u4f53\u5904\u7406\u6570\u636e\n        write();\n    } else if(pid > 0) { \/\/\u7236\u8fdb\u7a0b\u4f5c\u7528\u662f\u6301\u7eed\u76d1\u542c\u770b\u662f\u5426\u6709\u65b0\u5ba2\u6237\u7aef\u8bf7\u6c42\u8fde\u63a5\n        close(cfd); \/\/\u5173\u95ed\u7528\u4e8e\u4e0e\u5ba2\u6237\u7aef\u901a\u4fe1\u7684\u5957\u63a5\u5b57cfd\t\n        \/\/\u6ce8\u518c\u4fe1\u53f7\u6355\u6349\u51fd\u6570:SIGCHLD\uff0c\u5728\u56de\u8c03\u51fd\u6570\u4e2d\u5b8c\u6210\u5b50\u8fdb\u7a0b\u56de\u6536 while(waitpid());\t\n        contiue;\n    }\n}<\/code><\/pre>\n\n\n\n
ps\uff1a\u7f16\u8bd1\u65f6\u8981\u624b\u52a8\u8054\u5408\u7f16\u8bd1\uff0c\u5373gcc server.c wrap.c -o server -Wall<\/code><\/p>\n\n\n\n
\u5b9e\u73b0<\/h4>\n\n\n\n
#include<stdio.h>\n#include<stdlib.h>\n#include<string.h>\n#include<unistd.h>\n#include<signal.h>\n#include<sys\/socket.h>\n#include<arpa\/inet.h>\n#include<sys\/wait.h>\n#include<ctype.h>\n\n#include \"wrap.h\"\n\n#define SERV_PORT 8000\n\nvoid catch_child(int signum) { \/\/\u56de\u6536\u5b50\u8fdb\u7a0b\n    while(waitpid(0, NULL, WNOHANG) > 0);\n    return ;\n}\n\nint main(int argc, char *argv[]) {\n    pid_t pid;\n    int ret, i, n;\n    int listen_fd, connect_fd;\n    char buf[BUFSIZ], clit_ip[128];\n    socklen_t clit_addr_len;\n    struct sockaddr_in serv_addr, clit_addr;\n\n    bzero(&serv_addr, sizeof(serv_addr)); \/\/\u5c06\u670d\u52a1\u5668\u5730\u5740\u7ed3\u6784\u6e05\u96f6\n    serv_addr.sin_family = AF_INET;\n    serv_addr.sin_port = htons(SERV_PORT);\n    serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);\n\n    listen_fd = Socket(AF_INET, SOCK_STREAM, 0);\n\n    int opt = 1; \/\/\u8bbe\u7f6e\u7aef\u53e3\u590d\u7528\n    setsockopt(listen_fd, SOL_SOCKET, SO_REUSEADDR, (void *)&opt, sizeof(opt));\n\n    Bind(listen_fd, (struct sockaddr *)&serv_addr, sizeof(serv_addr));\n\n    Listen(listen_fd, 128);\n\n    clit_addr_len = sizeof(clit_addr);\n    while(1) {\n        connect_fd = Accept(listen_fd, (struct sockaddr *)&clit_addr, &clit_addr_len); \/\/\u963b\u585e\u76d1\u542c\n\n        pid = fork(); \/\/\u5148\u5efa\u7acb\u8fde\u63a5\u518dfork,\u907f\u514d\u591a\u4e2a\u8fdb\u7a0b\u540c\u65f6\u76d1\u542c\u540c\u4e00\u4e2alisten_fd\n\n        if(pid < 0) {\n            perr_exit(\"fork error\");\n        } else if(pid == 0) {\n            close(listen_fd);\n            break;\n        } else { \/\/\u7236\u8fdb\u7a0b\n            struct sigaction act;\n            act.sa_handler = catch_child;\n            sigemptyset(&act.sa_mask);\n            act.sa_flags = 0;\n            \/\/\u6ce8\u518c\u4fe1\u53f7\u6355\u6349\u51fd\u6570\n            ret = sigaction(SIGCHLD, &act, NULL);\n            if(ret != 0) perr_exit(\"sigaction error\");\n\n            close(connect_fd);\n            continue;\n        }\n    }\n\n    if(pid == 0) {\n        printf(\"client: IP = %s PORT = %d\\n\",\n                        inet_ntop(AF_INET, &clit_addr.sin_addr.s_addr, clit_ip, sizeof(clit_ip)),\n                        ntohs(clit_addr.sin_port));\n\n        while(1) {\n            n = Read(connect_fd, buf, sizeof(buf));\n            if(n == 0) { \/\/\u8bfb\u52300\u8bf4\u660e\u670d\u52a1\u5668\u68c0\u6d4b\u5230\u5ba2\u6237\u7aef\u5173\u95ed\u4e86\n                close(connect_fd);\n                exit(1);\n            }\n            for(i = 0; i < sizeof(buf); i++) buf[i] = toupper(buf[i]);\n            Write(connect_fd, buf, n);\n        }\n    }\n\n    return 0;\n}<\/code><\/pre>\n\n\n\n
\n\n\n\n
\u591a\u7ebf\u7a0b\u5e76\u53d1\u670d\u52a1\u5668<\/h2>\n\n\n\n
\u601d\u8def<\/h4>\n\n\n\n
\u2460Socket(); \u521b\u5efa\u76d1\u542c\u5957\u63a5\u5b57lfd <\/p>\n\n\n\n
\u2461Bind(); \u7ed1\u5b9a\u5730\u5740\u7ed3\u6784 Strcut sockaddr_in addr;<\/p>\n\n\n\n
\u2462Listen(); \u8bbe\u7f6e\u76d1\u542c\u4e0a\u9650<\/p>\n\n\n\n
\u2463<\/p>\n\n\n\n
while (1) {\t\t\n    cfd = Accept(lfd, );\n    pthread_create(&tid, NULL, tfn, (void *)cfd);\n    pthread_detach(tid);  \/\/\u8bbe\u7f6e\u7ebf\u7a0b\u5206\u79bb\uff0c\u7528\u4e8e\u56de\u6536\u5b50\u7ebf\u7a0b\n    \/\/pthead_join(tid, void **); \/\/\u5982\u679c\u8981\u56de\u6536\u5b50\u7ebf\u7a0b\u7684\u9000\u51fa\u72b6\u6001\uff0c\u5c31\u53ea\u80fd\u7528join\u51fd\u6570\uff0c\u9700\u8981\u65b0\u5efa\u4e00\u4e2a\u7ebf\u7a0b\u4e13\u95e8\u7528\u4e8e\u56de\u6536\u5b50\u7ebf\u7a0b\n    \/\/ps\uff1a\u5144\u5f1f\u7ebf\u7a0b\u4e4b\u95f4\u53ef\u4ee5\u56de\u6536\uff0c\u5144\u5f1f\u8fdb\u7a0b\u4e4b\u95f4\u4e0d\u80fd\u56de\u6536\uff08\u56e0\u6b64\u624d\u501f\u52a9\u4fe1\u53f7\u673a\u5236\uff09\n}<\/code><\/pre>\n\n\n\n
\u2464\u5b50\u7ebf\u7a0b\uff1a<\/p>\n\n\n\n
void *tfn(void *arg) {\n    \/\/close(lfd); \/\/\u5b50\u7ebf\u7a0b\u4e0d\u80fd\u5173\u95ed\u76d1\u542c\u5957\u63a5\u5b57lfd\uff0c\u56e0\u4e3a\u4e3b\u7ebf\u7a0b\u8981\u4f7f\u7528lfd\n    read(cfd);\n    \/\/\u5177\u4f53\u5904\u7406\u6570\u636e\n    write(cfd);\n    pthread_exit((void *)10);\t\n}<\/code><\/pre>\n\n\n\n
ps\uff1a\u7f16\u8bd1\u65f6\u8981\u624b\u52a8\u8054\u5408\u7f16\u8bd1\uff0c\u522b\u5fd8\u4e86\u94fe\u63a5pthread\u5e93\uff0c\u5373gcc server.c wrap.c -o server -Wall -pthread<\/code><\/p>\n\n\n\n
\u5b9e\u73b0<\/h4>\n\n\n\n
#include<stdio.h>\n#include<string.h>\n#include<unistd.h>\n#include<pthread.h>\n#include<sys\/socket.h>\n#include<arpa\/inet.h>\n#include<ctype.h>\n\n#include\"wrap.h\"\n\n#define SERV_PORT 8000\n#define MAXLINE 8192\n\nvoid *do_work(void *arg) { \/\/\u7ebf\u7a0b\u56de\u8c03\u51fd\u6570\n    int i, n;\n    int connect_fd = *(int *)arg; \/\/\u5982\u679c\u76f4\u63a5\u4f20\u503c,void\u662f64\u4f4d,int32\u4f4d,\u4f1a\u4e22\u5931\u6570\u636e\n\n    char buf[MAXLINE];\n\n    while(1) {\n        n = Read(connect_fd, buf, MAXLINE);\n        if(n == 0) {\n            printf(\"the client %d closed~\\n\", connect_fd);\n            break;\n        }\n        for(i = 0; i < n; i++) buf[i] = toupper(buf[i]);\n        Write(connect_fd, buf, n);\n    }\n    Close(connect_fd);\n\n    return (void *)0;\n}\n\nint main(int argc, char *argv[]) {\n    pthread_t tid;\n    int listen_fd;\n    int connect_fd[256];\n    char clit_ip[128];\n    struct sockaddr_in serv_addr, clit_addr;\n    socklen_t clit_addr_len;\n\n    bzero(&serv_addr, sizeof(serv_addr));\n    serv_addr.sin_family = AF_INET;\n    serv_addr.sin_port = htons(SERV_PORT);\n    serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);\n\n    listen_fd = Socket(AF_INET, SOCK_STREAM, 0);\n\n    int opt = 1; \/\/\u8bbe\u7f6e\u7aef\u53e3\u590d\u7528\n    setsockopt(listen_fd, SOL_SOCKET, SO_REUSEADDR, (void *)&opt, sizeof(opt));\n\n    Bind(listen_fd, (struct sockaddr *)&serv_addr, sizeof(serv_addr));\n\n    Listen(listen_fd, 128);\n\n    int i = 0;\n    clit_addr_len = sizeof(clit_addr);\n    while(1) {\n        connect_fd[i] = Accept(listen_fd, (struct sockaddr *)&clit_addr, &clit_addr_len); \/\/\u963b\u585e\u76d1\u542c\n        printf(\"client: IP = %s PORT = %d\\n\",\n                        inet_ntop(AF_INET, &clit_addr.sin_addr.s_addr, clit_ip, sizeof(clit_ip)),\n                        ntohs(clit_addr.sin_port));\n        \/\/pthread_create\u521b\u5efa\u7684\u7ebf\u7a0b\u63a5\u6536connect_fd\u7684\u5730\u5740\uff0c\u4f46\u7531\u4e8econnect_fd\u5728\u4e3b\u7ebf\u7a0b\u4e2d\u4e0d\u65ad\u88ab\u590d\u7528\uff0c\u6bcf\u6b21\u65b0\u8fde\u63a5\u4f1a\u8986\u76d6\u8fd9\u4e2a\u503c\n        \/\/\u5bfc\u81f4\u591a\u4e2a\u7ebf\u7a0b\u53ef\u80fd\u540c\u65f6\u8bbf\u95ee\u540c\u4e00\u4e2aconnect_fd\uff0c\u56e0\u6b64\u521b\u5efaconnect_fd\u6570\u7ec4\u5b58\u4e0d\u540c\u7684\u901a\u4fe1\u5957\u63a5\u5b57\uff0c\u4f7f\u6bcf\u4e00\u4e2a\u5b50\u7ebf\u7a0b\u8bbf\u95ee\u4e0d\u540c\u7684\n        pthread_create(&tid, NULL, do_work, &connect_fd[i]);\n        pthread_detach(tid); \/\/\u8bbe\u7f6e\u7ebf\u7a0b\u5206\u79bb,\u907f\u514d\u4ea7\u751f\u50f5\u5c38\u7ebf\u7a0b\n        i++;\n    }\n\n    return 0;\n}\n<\/code><\/pre>\n\n\n\n
\n\n\n\n
\u591a\u8defI\/O\u8f6c\u63a5\u670d\u52a1\u5668<\/h2>\n\n\n\n
\u539f\u7406\uff1a\u501f\u52a9\u5185\u6838\u4e0e\u51fd\u6570(select<\/code>\u3001poll<\/code>\u3001epoll<\/code>)\u6765\u540c\u65f6\u76d1\u542c\u591a\u4e2a\u5ba2\u6237\u7aef\u8fde\u63a5\u3001\u6570\u636e\u901a\u4fe1\u4e8b\u4ef6\uff0c\u4ece\u800c\u907f\u514d\u4e86\u963b\u585e\u5f0f\u76d1\u542c\uff0c\u63d0\u9ad8\u4e86\u670d\u52a1\u5668\u7684\u6027\u80fd\u548c\u54cd\u5e94\u6548\u7387<\/p>\n\n\n\n
select<\/h3>\n\n\n\n
select\u51fd\u6570<\/h4>\n\n\n\n
\u5934\u6587\u4ef6\uff1a#include<sys\/select.h><\/p>\n\n\n\n
int select(int nfds, fd_set *readfds, fd_set *writefds,fd_set *exceptfds, struct timeval *timeout);<\/code><\/p>\n\n\n\n
\u53c2\u6570\uff1a<\/p>\n\n\n\n
    \n
  • nfds\uff1a\u76d1\u542c\u7684\u6240\u6709\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e2d\u6700\u5927\u7684\u90a3\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26+1<\/li>\n\n\n\n
  • readfds\uff1a\u4f20\u5165\u4f20\u51fa\u53c2\u6570\uff0c\u76d1\u542c\u8bfb\u4e8b\u4ef6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408<\/li>\n\n\n\n
  • writefds\uff1a\u4f20\u5165\u4f20\u51fa\u53c2\u6570\uff0c\u76d1\u542c\u5199\u4e8b\u4ef6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408<\/li>\n\n\n\n
  • exceptfds\uff1a\u4f20\u5165\u4f20\u51fa\u53c2\u6570\uff0c\u76d1\u542c\u5f02\u5e38\u4e8b\u4ef6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408<\/li>\n\n\n\n
  • timeout\uff1a\u6307\u5b9a\u8d85\u65f6\u65f6\u95f4\uff0c\u5373\u8c03\u7528\u540e\u7b49\u5f85\u5bf9\u5e94\u4e8b\u4ef6\u6ee1\u8db3\u7684\u6700\u957f\u7b49\u5f85\u65f6\u957f\n
      \n
    • NULL\uff1a\u963b\u585e\u7b49\u5f85<\/li>\n\n\n\n
    • \u8bbe\u7f6etimeval\uff1e0\uff1a\u8bbe\u7f6e\u76d1\u542c\u8d85\u65f6\u65f6\u957f<\/li>\n\n\n\n
    • \u8bbe\u7f6etimeval= 0\uff1a\u975e\u963b\u585e\u76d1\u542c\uff0c\u8f6e\u8be2<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n
      \u8fd4\u56de\u503c\uff1a<\/p>\n\n\n\n
        \n
      • \uff1e0\uff1a\u6240\u6709\u76d1\u542c\u96c6\u5408(\u4e09\u4e2a)\u4e2d\u6ee1\u8db3\u5bf9\u5e94\u4e8b\u4ef6\u7684\u603b\u6570<\/li>\n\n\n\n
      • 0\uff1a\u6ca1\u6709\u6ee1\u8db3\u76d1\u542c\u6761\u4ef6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26<\/li>\n\n\n\n
      • -1\uff1aerrno<\/li>\n<\/ul>\n\n\n\n
        \u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408\u76f8\u5173\u51fd\u6570 <\/h4>\n\n\n\n
        \u2460void FD_ZERO(fd_set *set)<\/code>; \u5c06\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408\u7f6e0\uff08\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408\u672c\u8d28\u662f\u4f4d\u56fe\uff0c\u4e0b\u6807\u4ee3\u8868\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c\u503c\u662f0\u62161\uff09 <\/p>\n\n\n\n
        fd_set rset;\nFD_ZERO(&rset);<\/code><\/pre>\n\n\n\n
        \u2461void FD_SET(int fd, fd_set *set);<\/code> \u5c06\u5f85\u76d1\u542c\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c\u6dfb\u52a0\u5230\u76d1\u542c\u96c6\u5408\u4e2d<\/p>\n\n\n\n
        FD_SET(3, &rset);\nFD_SET(5, &rset);<\/code><\/pre>\n\n\n\n
        \u2462void FD_CLR(int fd, fd_set *set);<\/code> \u5c06\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u4ece\u76d1\u542c\u96c6\u5408\u4e2d\u79fb\u9664<\/p>\n\n\n\n
        FD_CLR\uff084, &rset\uff09;<\/code><\/pre>\n\n\n\n
        \u2463int FD_ISSET(int fd, fd_set *set);<\/code> \u5224\u65ad\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u662f\u5426\u5728\u76d1\u542c\u96c6\u5408\u4e2d <\/p>\n\n\n\n
        FD_ISSET(4\uff0c &rset); \/\/\u8fd4\u56de\u503c\uff1a1\u4ee3\u8868\u5728\uff0c0\u4ee3\u8868\u4e0d\u5728<\/code><\/pre>\n\n\n\n
        \u601d\u8def<\/h4>\n\n\n\n
        int maxfd = 0; \/\/\u8bb0\u5f55\u6700\u5927\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\nlfd = socket(); \/\/\u521b\u5efa\u76d1\u542c\u5957\u63a5\u5b57\nmaxfd = lfd\uff1b\nbind(); \/\/\u7ed1\u5b9a\u5730\u5740\u7ed3\u6784\nlisten(); \/\/\u8bbe\u7f6e\u76d1\u542c\u4e0a\u9650\n\nfd_set rset; \/\/\u521b\u5efa\u8bfb\u4e8b\u4ef6\u76d1\u542c\u96c6\u5408\nfd_set allset; \/\/\u521b\u5efa\u76d1\u542c\u96c6\u5408\u5907\u4efd\uff0c\u56e0\u4e3arset\u4f5c\u4e3a\u4f20\u5165\u4f20\u51fa\u53c2\u6570\u88ab\u8c03\u7528\u540e\u5c31\u6539\u53d8\u4e86\nFD_ZERO(&allset); \/\/\u5c06\u76d1\u542c\u96c6\u5408\u6e05\u7a7a\nFD_SET(lfd, &allset); \/\/\u5c06lfd\u6dfb\u52a0\u5230\u76d1\u542c\u96c6\u5408\u4e2d\n\nwhile(1) {\n\trset = allset; \/\/\u5c06\u76d1\u542c\u96c6\u5408\u5907\u4efd\u8d4b\u503c\u7ed9\u8bfb\u4e8b\u4ef6\u76d1\u542c\u96c6\u5408\n\tret = select(lfd+1, &rset, NULL, NULL, NULL); \/\/\u76d1\u542c\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408\u5bf9\u5e94\u4e8b\u4ef6 \n\tif(ret > 0) { \/\/\u6709\u76d1\u542c\u7684\u63cf\u8ff0\u7b26\u6ee1\u8db3\u5bf9\u5e94\u4e8b\u4ef6\n\t\tif(FD_ISSET(lfd, &rset)) { \/\/\u8bf4\u660e\u6709\u65b0\u7684\u5ba2\u6237\u7aef\u8bf7\u6c42\u8fde\u63a5\n\t\t\tcfd = accept(); \/\/\u5efa\u7acb\u8fde\u63a5\uff0c\u8fd4\u56de\u7528\u4e8e\u901a\u4fe1\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\n\t\t\tif(maxfd < cfd) maxfd = cfd;\n\t\t\tFD_SET(cfd, &allset); \/\/\u6dfb\u52a0\u5230\u76d1\u542c\u901a\u4fe1\u63cf\u8ff0\u7b26\u96c6\u5408\u4e2d \n\t\t}\n\t\tfor(i = lfd + 1; i <= maxfd; i++) {\n\t\t\tFD_ISSET(i, &rset) \/\/\u6709\u8bfb\u5199\u4e8b\u4ef6\u53d1\u751f\n\t\t\tread();\n\t\t\t\/\/\u5177\u4f53\u5904\u7406\u4e8b\u52a1\n\t\t\twrite();\n\t\t}\t\n\t}\n}<\/code><\/pre>\n\n\n\n
        \u5b9e\u73b0<\/h4>\n\n\n\n
        #include<stdio.h>\n#include<string.h>\n#include<unistd.h>\n#include<pthread.h>\n#include<sys\/socket.h>\n#include<arpa\/inet.h>\n#include<ctype.h>\n#include<sys\/select.h>\n\n#include\"wrap.h\"\n\n#define SERV_PORT 8000\n#define MAXLINE 8192\n\nint main(int argc, char *argv[]) {\n    int listen_fd, connect_fd;\n    char buf[BUFSIZ];\n    socklen_t clit_addr_len;\n    struct sockaddr_in serv_addr, clit_addr;\n\n    bzero(&serv_addr, sizeof(serv_addr)); \/\/\u5c06\u670d\u52a1\u5668\u5730\u5740\u7ed3\u6784\u6e05\u96f6\n    serv_addr.sin_family = AF_INET;\n    serv_addr.sin_port = htons(SERV_PORT);\n    serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);\n\n    listen_fd = Socket(AF_INET, SOCK_STREAM, 0);\n\n    int opt = 1; \/\/\u8bbe\u7f6e\u7aef\u53e3\u590d\u7528\n    setsockopt(listen_fd, SOL_SOCKET, SO_REUSEADDR, (void *)&opt, sizeof(opt));\n\n    Bind(listen_fd, (struct sockaddr *)&serv_addr, sizeof(serv_addr));\n\n    Listen(listen_fd, 128);\n\n    int ret, n, i, j;\n    int maxfd = listen_fd; \/\/\u8bb0\u5f55\u6700\u5927\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\uff08\u4e0d\u8d85\u8fc71024\uff09\n    fd_set rset, allset; \/\/\u5b9a\u4e49\u8bfb\u76d1\u542c\u96c6\u5408\u548c\u5907\u4efd\u96c6\u5408(\u56e0\u4e3arset\u4f5c\u4e3a\u4f20\u5165\u4f20\u51fa\u53c2\u6570\u88ab\u8c03\u7528\u540e\u4f1a\u6539\u53d8\u6570\u636e)\n\n    FD_ZERO(&allset); \/\/\u6e05\u7a7a\u76d1\u542c\u96c6\u5408\n    FD_SET(listen_fd, &allset);\n\n    while(1) {\n        rset = allset; \/\/\u5907\u4efd\n        ret = select(maxfd + 1, &rset, NULL, NULL, NULL); \/\/\u4f7f\u7528select\u76d1\u542c  \n        if(ret < 0) {\n            perr_exit(\"select error\");\n        }\n\n        if(FD_ISSET(listen_fd, &rset)) { \/\/\u9996\u5148\u5224\u65adlisten_fd\u662f\u5426\u6ee1\u8db3\u76d1\u542c\u7684\u8bfb\u4e8b\u4ef6\uff0c\u5373\u5148\u5904\u7406\u5ba2\u6237\u7aef\u8fde\u63a5\u8bf7\u6c42\n            clit_addr_len = sizeof(clit_addr);\n            connect_fd = Accept(listen_fd, (struct sockaddr *)&clit_addr, &clit_addr_len); \/\/\u4e0e\u5ba2\u6237\u7aef\u5efa\u7acb\u8fde\u63a5\uff0c\u975e\u963b\u585e\n            FD_SET(connect_fd, &allset); \/\/\u5c06\u65b0\u4ea7\u751f\u7684fd\u6dfb\u52a0\u5230\u76d1\u542c\u96c6\u5408\u4e2d\n            if(maxfd < connect_fd) maxfd = connect_fd; \/\/\u66f4\u65b0maxfd\n\n            if(ret == 1) { \/\/\u8bf4\u660eselect\u53ea\u8fd4\u56de\u4e86\u4e00\u4e2a\u9700\u8981\u5904\u7406\u7684\u4e8b\u4ef6\u4e14\u662f\u5efa\u7acb\u8fde\u63a5\u4e8b\u4ef6\uff0c\u6ca1\u6709c\/s\u4f20\u8f93\u4e8b\u4ef6\uff0c\u540e\u7eed\u65e0\u9700\u6267\u884c\n                continue;\n            }\n        }\n        \/\/\u5faa\u73af\u5224\u65ad\uff0c\u6548\u7387\u8f83\u4f4e\n        for(i = listen_fd + 1; i <= maxfd; i++) { \/\/\u5904\u7406\u6ee1\u8db3\u8bfb\u4e8b\u4ef6\u7684fd\uff0c\u5373c\/s\u4e4b\u95f4\u7684\u6570\u636e\u4f20\u8f93\n            if(FD_ISSET(i, &rset)) { \/\/\u627e\u5230\u6ee1\u8db3\u8bfb\u4e8b\u4ef6\u7684fd\n                n = read(i, buf, sizeof(buf));\n                if(n == 0) { \/\/\u8bf4\u660e\u5ba2\u6237\u7aef\u5df2\u5173\u95ed\u8fde\u63a5\n                    Close(i);\n                    FD_CLR(i, &allset); \/\/\u5c06\u5173\u95ed\u7684fd\u4ece\u76d1\u542c\u96c6\u5408\u4e2d\u79fb\u9664\n                } else if(n == -1) {\n                    perr_exit(\"read error\");\n                }\n\n                for(j = 0; j < n; j++) buf[j] = toupper(buf[j]);\n                Write(i, buf, n);\n                Write(STDOUT_FILENO, buf, n);\n            }\n        }\n    }\n\n    Close(listen_fd);\n\n    return 0;\n}<\/code><\/pre>\n\n\n\n
        \u4f18\u7f3a\u70b9<\/h4>\n\n\n\n
          \n
        • \u4f18\u70b9\uff1a\u652f\u6301\u8de8\u5e73\u53f0 win\u3001linux\u3001macOS\u3001Unix\u3001\u7c7bUnix\u3001mips<\/li>\n\n\n\n
        • \u7f3a\u70b9\uff1a\n
            \n
          • \u76d1\u542c\u4e0a\u9650\u53d7\u6587\u4ef6\u63cf\u8ff0\u7b26\u6570\u91cf\u9650\u5236\uff0c\u6700\u59271024<\/li>\n\n\n\n
          • \u68c0\u6d4b\u5230\u6ee1\u8db3\u6761\u4ef6\u7684fd\uff0c\u53ea\u80fd\u81ea\u5df1\u6dfb\u52a0\u4e1a\u52a1\u903b\u8f91\uff0c\u63d0\u9ad8\u4e86\u7f16\u7801\u96be\u5ea6 <\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n
            poll <\/h3>\n\n\n\n
            \u51fd\u6570\u539f\u578b<\/h4>\n\n\n\n
            int poll(struct pollfd *fds, nfds_t nfds, int timeout);<\/code><\/p>\n\n\n\n
            struct pollfd {\t\t\n    int fd; \u5f85\u76d1\u542c\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\n    short events; \u5f85\u76d1\u542c\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u5bf9\u5e94\u7684\u76d1\u542c\u4e8b\u4ef6(\u53d6\u503c\uff1aPOLLIN\u3001POLLOUT\u3001POLLERR)\n    short revnets; \u4f20\u5165\u65f6\u8d4b\u503c0\uff0c\u5982\u679c\u6ee1\u8db3\u5bf9\u5e94\u4e8b\u4ef6\u7684\u8bdd\uff0c\u8fd4\u56de\u975e0(\u548c\u5bf9\u5e94\u7684POLLIN\u3001POLLOUT\u6216POLLERR\u8fdb\u884c&\u5224\u65ad)\n}<\/code><\/pre>\n\n\n\n
            \u53c2\u6570\uff1a<\/p>\n\n\n\n
              \n
            • fds\uff1a\u76d1\u542c\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u6570\u7ec4<\/li>\n\n\n\n
            • nfds\uff1a\u76d1\u542c\u6570\u7ec4\u7684\u5b9e\u9645\u6709\u6548\u76d1\u542c\u4e2a\u6570<\/li>\n\n\n\n
            • timeout\uff1a\n
                \n
              • 0\uff1a\u8d85\u65f6\u65f6\u957f\uff0c\u5355\u4f4d\u6beb\u79d2<\/li>\n\n\n\n
              • -1\uff1a\u963b\u585e\u7b49\u5f85<\/li>\n\n\n\n
              • 0\uff1a\u4e0d\u963b\u585e<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n
                \u8fd4\u56de\u503c\uff1a\u6ee1\u8db3\u5bf9\u5e94\u76d1\u542c\u4e8b\u4ef6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u603b\u4e2a\u6570<\/p>\n\n\n\n
                \u4f18\u7f3a\u70b9\uff1a<\/p>\n\n\n\n
                  \n
                • \u4f18\u70b9\uff1a\n
                    \n
                  • \u81ea\u5e26\u6570\u7ec4\u7ed3\u6784<\/li>\n\n\n\n
                  • \u53ef\u4ee5\u5c06\u76d1\u542c\u4e8b\u4ef6\u96c6\u5408\u548c\u8fd4\u56de\u4e8b\u4ef6\u96c6\u5408\u5206\u79bb<\/li>\n\n\n\n
                  • \u53ef\u4ee5\u62d3\u5c55\u76d1\u542c\u4e0a\u9650\uff0c\u8d85\u51fa1024\u9650\u5236<\/li>\n<\/ul>\n<\/li>\n\n\n\n
                  • \u7f3a\u70b9\uff1a\n
                      \n
                    • \u4e0d\u80fd\u8de8\u5e73\u53f0\uff0c\u53ea\u652f\u6301Linux<\/li>\n\n\n\n
                    • \u65e0\u6cd5\u76f4\u63a5\u5b9a\u4f4d\u5230\u6ee1\u8db3\u76d1\u542c\u4e8b\u4ef6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c \u7f16\u7801\u96be\u5ea6\u8f83\u5927 <\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n
                      \u7a81\u78341024\u6587\u4ef6\u63cf\u8ff0\u7b26\u9650\u5236<\/h4>\n\n\n\n
                      \u67e5\u770b\uff1a<\/p>\n\n\n\n
                      cat \/proc\/sys\/fs\/file-max<\/code>\uff1a\u5f53\u524d\u8ba1\u7b97\u673a\u6240\u80fd\u6253\u5f00\u7684\u6700\u5927\u6587\u4ef6\u4e2a\u6570(\u53d6\u51b3\u4e8e\u786c\u4ef6)<\/p>\n\n\n\n
                      ulimit -a<\/code>\uff1a\u5f53\u524d\u7528\u6237\u4e0b\u7684\u8fdb\u7a0b\uff0c\u9ed8\u8ba4\u6253\u5f00\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e2a\u6570\uff0c\u9ed8\u8ba4\u4e3a 1024<\/p>\n\n\n\n
                      \u4fee\u6539\uff1a
                      sudo vim \/etc\/security\/limits.conf<\/code>\uff0c\u5199\u5165\uff1a<\/p>\n\n\n\n
                      * soft nofile 65536 \u8bbe\u7f6e\u9ed8\u8ba4\u503c\uff0c\u53ef\u4ee5\u76f4\u63a5\u501f\u52a9\u547d\u4ee4ulimit -n 21000<\/code>\u8fdb\u884c\u4fee\u6539\uff08\u6ce8\u9500\u7528\u6237\uff0c\u4f7f\u5176\u751f\u6548\uff09<\/p>\n\n\n\n
                      * hard nofile 100000 \u8bbe\u7f6e\u547d\u4ee4\u4fee\u6539\u7684\u4e0a\u9650<\/p>\n\n\n\n
                      epoll<\/h3>\n\n\n\n
                      \u76f8\u5173\u51fd\u6570<\/h4>\n\n\n\n
                      int epoll_create<\/strong>(int size);<\/code> \u521b\u5efa\u4e00\u68f5\u76d1\u542c\u7ea2\u9ed1\u6811<\/p>\n\n\n\n
                        \n
                      • \u53c2\u6570\uff1a\u521b\u5efa\u7684\u7ea2\u9ed1\u6811\u7684\u76d1\u542c\u8282\u70b9\u6570\u91cf(\u4ec5\u4f9b\u5185\u6838\u53c2\u8003)<\/li>\n\n\n\n
                      • \u8fd4\u56de\u503c\uff1a\u6307\u5411\u65b0\u521b\u5efa\u7684\u7ea2\u9ed1\u6811\u6839\u8282\u70b9\u7684fd\uff0c\u5931\u8d25\u8fd4\u56de-1 <\/li>\n<\/ul>\n\n\n\n
                        int epoll_ctl<\/strong>(int epfd, int op, int fd, struct epoll_event *event);<\/code> \u64cd\u4f5c\u76d1\u542c\u7ea2\u9ed1\u6811<\/p>\n\n\n\n
                        \u53c2\u6570\uff1a<\/p>\n\n\n\n
                          \n
                        • epfd\uff1aepoll_create\u51fd\u6570\u7684\u8fd4\u56de\u503c<\/li>\n\n\n\n
                        • op\uff1a\u5bf9\u8be5\u76d1\u542c\u7ea2\u9ed1\u6811\u6240\u505a\u7684\u64cd\u4f5c\n
                            \n
                          • EPOLL_CTL_ADD\uff1a\u6dfb\u52a0fd\u5230\u76d1\u542c\u7ea2\u9ed1\u6811<\/li>\n\n\n\n
                          • EPOLL_CTL_MOD\uff1a\u4fee\u6539fd\u5728\u76d1\u542c\u7ea2\u9ed1\u6811\u4e0a\u7684\u76d1\u542c\u4e8b\u4ef6<\/li>\n\n\n\n
                          • EPOLL_CTL_DEL\uff1a\u5c06\u4e00\u4e2afd\u4ece\u76d1\u542c\u7ea2\u9ed1\u6811\u4e0a\u79fb\u9664\uff0c\u53d6\u6d88\u76d1\u542c(\u5f53\u64cd\u4f5c\u662f\u79fb\u9664\u65f6\uff0c\u6700\u540e\u4e00\u4e2a\u53c2\u6570\u53ef\u4ee5\u4f20NULL)<\/li>\n<\/ul>\n<\/li>\n\n\n\n
                          • fd\uff1a\u5f85\u76d1\u542c\u7684fd<\/li>\n\n\n\n
                          • event\uff1a\u672c\u8d28\u662fstruct epoll_event\u7ed3\u6784\u4f53\u7684\u5730\u5740\uff0c\u8be5\u7ed3\u6784\u4f53\u6709\u4e24\u4e2a\u6210\u5458\u53d8\u91cf\uff1aevents\u548cdata\n
                              \n
                            • events\uff1a\n
                                \n
                              • EPOLLIN <\/li>\n\n\n\n
                              • EPOLLOUT<\/li>\n\n\n\n
                              • EPOLLERR<\/li>\n<\/ul>\n<\/li>\n\n\n\n
                              • data\uff1a\u8054\u5408\u4f53(\u5171\u7528\u4f53)\n
                                  \n
                                • int fd; \u5bf9\u5e94\u76d1\u542c\u4e8b\u4ef6\u7684fd<\/li>\n\n\n\n
                                • void *ptr; <\/li>\n\n\n\n
                                • uint32_t u32;<\/li>\n\n\n\n
                                • uint64_t u64;          <\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n
                                  \u8fd4\u56de\u503c\uff1a<\/p>\n\n\n\n
                                    \n
                                  • \u6210\u529f\uff1a0 <\/li>\n\n\n\n
                                  • \u5931\u8d25\uff1a-1\uff0cerrno<\/li>\n<\/ul>\n\n\n\n
                                    int epoll_wait<\/strong>(int epfd, struct epoll_event *events, int maxevents, int timeout);<\/code> \u963b\u585e\u76d1\u542c <\/p>\n\n\n\n
                                    \u53c2\u6570\uff1a<\/p>\n\n\n\n
                                      \n
                                    • epfd\uff1aepoll_create \u51fd\u6570\u7684\u8fd4\u56de\u503c<\/li>\n\n\n\n
                                    • events\uff1a\u4f20\u51fa\u53c2\u6570\uff0c\u662f\u4e00\u4e2a\u6570\u7ec4<\/strong>\uff0c\u8bb0\u5f55\u6ee1\u8db3\u76d1\u542c\u6761\u4ef6\u7684\u90a3\u4e9bfd\u7ed3\u6784\u4f53<\/li>\n\n\n\n
                                    • maxevents\uff1a\u6570\u7ec4\u5143\u7d20\u7684\u603b\u4e2a\u65701024<\/li>\n\n\n\n
                                    • timeout\uff1a\u8d85\u65f6\u65f6\u95f4\n
                                        \n
                                      • -1\uff1a\u963b\u585e<\/li>\n\n\n\n
                                      • 0\uff1a\u975e\u963b\u585e<\/li>\n\n\n\n
                                      • >0\uff1a\u8d85\u65f6\u65f6\u95f4(\u6beb\u79d2)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n
                                        \u8fd4\u56de\u503c\uff1a<\/p>\n\n\n\n
                                          \n
                                        • > 0\uff1a\u6ee1\u8db3\u76d1\u542c\u7684\u603b\u4e2a\u6570(\u53ef\u4ee5\u7528\u4f5c\u5faa\u73af\u4e0a\u9650)<\/li>\n\n\n\n
                                        • 0\uff1a\u6ca1\u6709\u6ee1\u8db3\u76d1\u542c\u4e8b\u4ef6\u7684fd<\/li>\n\n\n\n
                                        • -1\uff1a\u5931\u8d25\uff0cerrno<\/li>\n<\/ul>\n\n\n\n
                                          \u4f18\u7f3a\u70b9\uff1a<\/p>\n\n\n\n
                                            \n
                                          • \u4f18\u70b9\uff1a\n
                                              \n
                                            • \u9ad8\u6548<\/li>\n\n\n\n
                                            • \u53ef\u4ee5\u7a81\u78341024\u6587\u4ef6\u63cf\u8ff0\u7b26\u9650\u5236<\/li>\n<\/ul>\n<\/li>\n\n\n\n
                                            • \u7f3a\u70b9\uff1a\u4e0d\u80fd\u8de8\u5e73\u53f0\uff0c\u53ea\u652f\u6301Linux<\/li>\n<\/ul>\n\n\n\n
                                              \u5b9e\u73b0<\/h4>\n\n\n\n
                                              #include<stdio.h>\n#include<string.h>\n#include<unistd.h>\n#include<pthread.h>\n#include<sys\/socket.h>\n#include<arpa\/inet.h>\n#include<ctype.h>\n#include<sys\/epoll.h>\n\n#include\"wrap.h\"\n\n#define SERV_PORT 8000\n#define MAXLINE 8192\n#define OPEN_MAX 5000\n\nint main(int argc, char *argv[]) {\n    int listen_fd, connect_fd, sock_fd;\n    char buf[MAXLINE], str[INET_ADDRSTRLEN];\n    struct sockaddr_in serv_addr, clit_addr;\n    socklen_t clit_addr_len;\n    ssize_t nready, epfd, res;\n    int num = 0, n, i;\n    struct epoll_event tep, ep[OPEN_MAX]; \/\/tep:epoll_ctl\u7684\u53c2\u6570 ep[]:epoll_wait\u7684\u53c2\u6570\n\n    bzero(&serv_addr, sizeof(serv_addr)); \/\/\u5c06\u670d\u52a1\u5668\u5730\u5740\u7ed3\u6784\u6e05\u96f6\n    serv_addr.sin_family = AF_INET;\n    serv_addr.sin_port = htons(SERV_PORT);\n    serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);\n\n    listen_fd = Socket(AF_INET, SOCK_STREAM, 0);\n\n    int opt = 1; \/\/\u8bbe\u7f6e\u7aef\u53e3\u590d\u7528\n    setsockopt(listen_fd, SOL_SOCKET, SO_REUSEADDR, (void *)&opt, sizeof(opt));\n\n    Bind(listen_fd, (struct sockaddr *)&serv_addr, sizeof(serv_addr));\n\n    Listen(listen_fd, 128);\n\n    epfd = epoll_create(OPEN_MAX); \/\/\u521b\u5efaepoll\u6a21\u578b\uff0cepfd\u6307\u5411\u7ea2\u9ed1\u6811\u6839\u8282\u70b9 \n    if(epfd == -1) perr_exit(\"epoll_create error\");\n\n    tep.events = EPOLLIN; \/\/\u6307\u5b9alisten_fd\u7684\u76d1\u542c\u4e8b\u4ef6\u4e3a\u8bfb\n    tep.data.fd = listen_fd;\n\n    res = epoll_ctl(epfd, EPOLL_CTL_ADD, listen_fd, &tep); \/\/\u5c06listen_fd\u4ee5\u53ca\u5bf9\u5e94\u7684\u7ed3\u6784\u4f53\u6dfb\u52a0\u5230\u76d1\u542c\u7ea2\u9ed1\u6811\u4e2d\n    if(res == -1) perr_exit(\"epoll_ctl error\");\n\n    while(1) {\n        \/\/\u4f7f\u7528epoll\u76d1\u542c,ep\u4f20\u51fa\u53c2\u6570\u662fstruct epoll_event\u7c7b\u578b\u6570\u7ec4,\u6570\u7ec4\u540d\u672c\u8eab\u5c31\u662f\u5730\u5740\u4e86\uff0c\u56e0\u6b64\u4e0d\u7528\u52a0&\n        nready = epoll_wait(epfd, ep, OPEN_MAX, -1); \/\/OPEN_MAX\u4e3a\u6570\u7ec4\u603b\u5bb9\u91cf\uff0c-1\u8868\u793a\u6c38\u4e45\u963b\u585e\u76d1\u542c \n        if(nready == -1) perr_exit(\"epoll_wait error\");\n\n        for(i = 0; i < nready; i++) {\n            if(ep[i].data.fd == listen_fd) { \/\/\u5224\u65ad\u6ee1\u8db3\u4e8b\u4ef6\u7684fd\u662f\u4e0d\u662flisten_fd\uff0c\u5373\u5148\u5904\u7406\u5ba2\u6237\u7aef\u8fde\u63a5\u8bf7\u6c42\n                clit_addr_len = sizeof(clit_addr);\n                connect_fd = Accept(listen_fd, (struct sockaddr *)&clit_addr, &clit_addr_len); \/\/\u4e0e\u5ba2\u6237\u7aef\u5efa\u7acb\u8fde\uff0c>    \u975e\u963b\u585e\n                printf(\"received from %s at PORT %d\\n\",\n                       inet_ntop(AF_INET, &clit_addr.sin_addr, str, sizeof(str)),\n                       ntohs(clit_addr.sin_port));\n\n                tep.events = EPOLLIN | EPOLLET; \/\/\u8fb9\u7f18\u89e6\u53d1\n                tep.data.fd = connect_fd;\n                res = epoll_ctl(epfd, EPOLL_CTL_ADD, connect_fd, &tep); \/\/\u5c06\u65b0\u5ba2\u6237\u7aefsocket\u6dfb\u52a0\u5230epoll\u4e2d\n                if(res == -1) perr_exit(\"epoll_ctl error\");\n            } else { \/\/\u5904\u7406\u5ba2\u6237\u7aef\u8bf7\u6c42\n                sock_fd = ep[i].data.fd;\n                n = Read(sock_fd, buf, sizeof(buf));\n                if(n == 0) { \/\/\u8bfb\u52300\uff0c\u8bf4\u660e\u5ba2\u6237\u7aef\u5df2\u5173\u95ed\u8fde\u63a5\n                    res = epoll_ctl(epfd, EPOLL_CTL_DEL, sock_fd, NULL); \/\/\u5c06\u5df2\u7ecf\u5173\u95ed\u8fde\u63a5\u7684fd\u4ece\u76d1\u542c\u7ea2\u9ed1\u6811\u4e2d\u79fb\u9664\n                    if(res == -1) perr_exit(\"epoll_ctl error\");\n                    Close(sock_fd);\n                    printf(\"client[%d] closed connection\\n\", sock_fd);\n                } else if(n < 0) { \/\/\u51fa\u9519\n                    perr_exit(\"read n<0 error\");\n                    res = epoll_ctl(epfd, EPOLL_CTL_DEL, sock_fd, NULL); \/\/\u5c06\u5df2\u7ecf\u5173\u95ed\u8fde\u63a5\u7684fd\u4ece\u76d1\u542c\u7ea2\u9ed1\u6811\u4e2d\u79fb\u9664\n                    Close(sock_fd);\n                } else {\n                    for(i = 0; i < n; i++) buf[i] = toupper(buf[i]);\n                    Write(sock_fd, buf, n);\n                    Write(STDOUT_FILENO, buf, n);\n                }\n            }\n        }\n    }\n\n    Close(listen_fd);\n\n    return 0;\n}<\/code><\/pre>\n\n\n\n
                                              epoll\u8fdb\u9636<\/h3>\n\n\n\n
                                              \u4e8b\u4ef6\u6a21\u578b<\/h4>\n\n\n\n
                                              ET\u6a21\u578b<\/strong><\/p>\n\n\n\n
                                              \u8fb9\u6cbf\u89e6\u53d1<\/p>\n\n\n\n
                                              \u7f13\u51b2\u533a\u6709\u5269\u4f59\u672a\u8bfb\u5c3d\u7684\u6570\u636e\u4e0d\u4f1a\u5bfc\u81f4epoll_wait<\/code>\u518d\u6b21\u89e6\u53d1\uff0c\u53ea\u6709\u65b0\u7684\u4e8b\u4ef6\u6ee1\u8db3\u624d\u4f1a\u89e6\u53d1<\/p>\n\n\n\n
                                              struct epoll_event event;\nevent.events = EPOLLIN | EPOLLET; \/\/\u8fb9\u6cbf\u89e6\u53d1<\/code><\/pre>\n\n\n\n
                                              LT\u6a21\u578b<\/strong><\/p>\n\n\n\n
                                              \u6c34\u5e73\u89e6\u53d1(\u9ed8\u8ba4\u4f7f\u7528\u8be5\u6a21\u5f0f)<\/p>\n\n\n\n
                                              \u7f13\u51b2\u533a\u6709\u5269\u4f59\u672a\u8bfb\u5c3d\u7684\u6570\u636e\u4f1a\u5bfc\u81f4epoll_wait<\/code>\u518d\u6b21\u89e6\u53d1<\/p>\n\n\n\n
                                              struct epoll_event event;\nevent.events = EPOLLIN; \/\/\u9ed8\u8ba4\u5c31\u662f\u6c34\u5e73\u89e6\u53d1<\/code><\/pre>\n\n\n\n
                                              \u7ed3\u8bba<\/strong><\/p>\n\n\n\n
                                              epoll \u7684ET\u6a21\u5f0f\u66f4\u9ad8\u6548\uff0c\u4f46\u662f\u53ea\u652f\u6301\u975e\u963b\u585e<\/strong>\u6a21\u5f0f(\u5fd9\u8f6e\u8be2)  <\/p>\n\n\n\n
                                              struct epoll_event event;\nevent.events = EPOLLIN | EPOLLET;\nepoll_ctl(epfd, EPOLL_CTL_ADD, connect_fd\uff0c &event);    \n\/\/\u4fee\u6539\u5957\u63a5\u5b57\u4e3a\u975e\u963b\u585e\u6a21\u5f0f\nint flg = fcntl(connect_fd, F_GETFL);  \nflg |= O_NONBLOCK;\nfcntl(connect_fd, F_SETFL, flg);<\/code><\/pre>\n\n\n\n
                                              epoll\u53cd\u5e94\u5806\u6a21\u578b<\/h4>\n\n\n\n
                                              \u5c5e\u4e8eReactor<\/em>\u6a21\u578b\u7684\u4e00\u79cd\u5177\u4f53\u5b9e\u73b0<\/strong><\/p>\n\n\n\n
                                              epoll\u53cd\u5e94\u5806\u6a21\u578b = epoll ET\u6a21\u5f0f + \u975e\u963b\u585e\u3001\u5fd9\u8f6e\u8be2 + void *ptr<\/p>\n\n\n\n
                                              \u53cd\u5e94\u5806\u4e0d\u4ec5\u8981\u76d1\u542cconnect_fd\u7684\u8bfb\u4e8b\u4ef6\uff0c\u8fd8\u8981\u76d1\u542cconnect_fd\u7684\u5199\u4e8b\u4ef6<\/strong>\uff0c\u4e0d\u80fd\u8bfb\u5230\u76f4\u63a5\u5199(\u56e0\u4e3a\u5b9e\u9645\u901a\u4fe1\u65f6\u7684\u7f51\u7edc\u73af\u5883\u5f88\u590d\u6742\uff0c\u6bd4\u5982\u6ed1\u52a8\u7a97\u53e3\u7684\u5b58\u5728\uff0c\u56e0\u6b64\u4e0d\u80fd\u60f3\u5199\u5c31\u5199\uff0c\u65e2\u7136\u6211\u4eec\u8bfb\u4e4b\u524d\u8981\u5224\u65ad\u4e00\u4e0b\uff0c\u90a3\u5199\u4e8b\u4ef6\u4e5f\u7406\u5e94\u5224\u65ad)<\/p>\n\n\n\n
                                              \u81ea\u5b9a\u4e49\u51fd\u6570\u4f5c\u7528\uff1a<\/p>\n\n\n\n
                                                \n
                                              • eventset\u51fd\u6570\uff1a\u4e3afd\u8bbe\u7f6e\u4e0d\u540c\u7684\u56de\u8c03\u51fd\u6570\n
                                                  \n
                                                • lfd\u2192acceptconn()\uff0c\u5efa\u7acb\u8fde\u63a5<\/li>\n\n\n\n
                                                • cfd\u2192recvdata()\uff0c\u8bfb\u6570\u636e<\/li>\n\n\n\n
                                                • cfd\u2192senddata()\uff0c\u5199\u6570\u636e<\/li>\n<\/ul>\n<\/li>\n\n\n\n
                                                • eventadd\u51fd\u6570\uff1a\u5c06\u4e00\u4e2afd\u6dfb\u52a0\u5230\u76d1\u542c\u7ea2\u9ed1\u6811\u4e0a\uff0c\u5e76\u8bbe\u7f6e\u76d1\u542c\u4e8b\u4ef6<\/li>\n<\/ul>\n\n\n\n
                                                  \u5728\u7f51\u7edc\u7f16\u7a0b\u4e2d\uff0crecv()<\/code>\u51fd\u6570\u76f8\u5f53\u4e8eread()<\/code>\u51fd\u6570(\u5f53\u628a\u6700\u540e\u4e00\u4e2a\u53c2\u6570flags\u7f6e0\u65f6)\uff0csend()<\/code>\u51fd\u6570\u76f8\u5f53\u4e8ewrite()<\/code>\u51fd\u6570<\/p>\n\n\n\n
                                                  \u4e0e\u5e38\u89c4epoll\u6d41\u7a0b\u5bf9\u6bd4<\/strong><\/p>\n\n\n\n
                                                  \u539f\u6765<\/strong>\uff1asocket\u3001bind\u3001listen\u2192epoll_create\u521b\u5efa\u76d1\u542c\u7ea2\u9ed1\u6811\u2192\u8fd4\u56de epfd\u2192epoll_ctl()\u5411\u6811\u4e0a\u6dfb\u52a0\u4e00\u4e2a\u76d1\u542cfd\u2192while(1)\u2192epoll_wait\u76d1\u542c\u2192\u5bf9\u5e94\u76d1\u542cfd\u6709\u4e8b\u4ef6\u6ee1\u8db3\u2192\u8fd4\u56de\u76d1\u542c\u6ee1\u8db3\u6570\u7ec4\u2192\u5224\u65ad\u8fd4\u56de\u6570\u7ec4\u5143\u7d20\u2192lfd\u6ee1\u8db3\u2192accept\u2192cfd\u6ee1\u8db3\u2192read()\u2192\u5904\u7406\u6570\u636e\u2192write\u56de\u53bb<\/p>\n\n\n\n
                                                  \u53cd\u5e94\u5806<\/strong>\uff1asocket\u3001bind\u3001listen\u2192epoll_create\u521b\u5efa\u76d1\u542c\u7ea2\u9ed1\u6811\u2192\u8fd4\u56de epfd\u2192epoll_ctl()\u5411\u6811\u4e0a\u6dfb\u52a0\u4e00\u4e2a\u76d1\u542cfd\u2192while(1)\u2192epoll_wait\u76d1\u542c\u2192\u5bf9\u5e94\u76d1\u542cfd\u6709\u4e8b\u4ef6\u6ee1\u8db3\u2192\u8fd4\u56de\u76d1\u542c\u6ee1\u8db3\u6570\u7ec4\u2192\u5224\u65ad\u8fd4\u56de\u6570\u7ec4\u5143\u7d20\u2192lfd\u6ee1\u8db3\u2192accept\u2192cfd\u6ee1\u8db3\u2192read()\u2192\u5904\u7406\u6570\u636e\u2192cfd\u4ece\u76d1\u542c\u7ea2\u9ed1\u6811\u4e0a\u6458\u4e0b\u2192events\u6539\u4e3aEPOLLOUT\u2192EPOLL_CTL_ADD\u91cd\u65b0\u653e\u5230\u7ea2\u9ed1\u4e0a\u76d1\u542c\u5199\u4e8b\u4ef6\u2192\u7b49\u5f85epoll_wait\u8fd4\u56de\u2192\u6ee1\u8db3\u8bf4\u660ecfd\u53ef\u5199\u2192write\u56de\u53bb\u2192cfd\u4ece\u76d1\u542c\u7ea2\u9ed1\u6811\u4e0a\u6458\u4e0b\u2192events\u6539\u4e3aEPOLLIN\u2192EPOLL_CTL_ADD\u91cd\u65b0\u653e\u5230\u7ea2\u9ed1\u4e0a\u76d1\u542c\u8bfb\u4e8b\u4ef6\u2192epoll_wait\u7ee7\u7eed\u76d1\u542c<\/p>\n\n\n\n
                                                  \u5b9e\u73b0<\/strong><\/p>\n\n\n\n
                                                  \/*\n *epoll\u57fa\u4e8e\u975e\u963b\u585eI\/O\u4e8b\u4ef6\u9a71\u52a8\n *\/\n#include <stdio.h>\n#include <sys\/socket.h>\n#include <sys\/epoll.h>\n#include <arpa\/inet.h>\n#include <fcntl.h>\n#include <unistd.h>\n#include <errno.h>\n#include <string.h>\n#include <stdlib.h>\n#include <time.h>\n\n#define MAX_EVENTS  1024                                    \/\/\u76d1\u542c\u4e0a\u9650\u6570\n#define BUFLEN 4096\n#define SERV_PORT   8080\n\nvoid recvdata(int fd, int events, void *arg);\nvoid senddata(int fd, int events, void *arg);\n\n\/* \u63cf\u8ff0\u5c31\u7eea\u6587\u4ef6\u63cf\u8ff0\u7b26\u76f8\u5173\u4fe1\u606f void *ptr\u91cc\u5b58\u7684\u5c31\u662f\u8be5\u7ed3\u6784\u4f53*\/\n\nstruct myevent_s {\n    int fd;                                                 \/\/\u8981\u76d1\u542c\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\n    int events;                                             \/\/\u5bf9\u5e94\u7684\u76d1\u542c\u4e8b\u4ef6\n    void *arg;                                              \/\/\u6cdb\u578b\u53c2\u6570\n    void (*call_back)(int fd, int events, void *arg);       \/\/\u56de\u8c03\u51fd\u6570\n    int status;                                             \/\/\u662f\u5426\u5728\u76d1\u542c:1->\u5728\u7ea2\u9ed1\u6811\u4e0a(\u76d1\u542c), 0->\u4e0d\u5728(\u4e0d\u76d1\u542c)\n    char buf[BUFLEN];\n    int len;\n    long last_active;                                       \/\/\u8bb0\u5f55\u6bcf\u6b21\u52a0\u5165\u7ea2\u9ed1\u6811 g_efd \u7684\u65f6\u95f4\u503c\n};\n\nint g_efd;                                                  \/\/\u5168\u5c40\u53d8\u91cf, \u4fdd\u5b58epoll_create\u8fd4\u56de\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\nstruct myevent_s g_events[MAX_EVENTS+1];                    \/\/\u81ea\u5b9a\u4e49\u7ed3\u6784\u4f53\u7c7b\u578b\u6570\u7ec4. +1-->listen fd\n\n\n\/*\u5c06\u7ed3\u6784\u4f53 myevent_s \u6210\u5458\u53d8\u91cf \u521d\u59cb\u5316*\/\n\nvoid eventset(struct myevent_s *ev, int fd, void (*call_back)(int, int, void *), void *arg)\n{\n    ev->fd = fd;\n    ev->call_back = call_back;\n    ev->events = 0;\n    ev->arg = arg;\n    ev->status = 0;\n    memset(ev->buf, 0, sizeof(ev->buf));\n    ev->len = 0;\n    ev->last_active = time(NULL);                       \/\/\u8c03\u7528eventset\u51fd\u6570\u7684\u65f6\u95f4\n\n    return;\n}\n\n\/* \u5411 epoll\u76d1\u542c\u7684\u7ea2\u9ed1\u6811 \u6dfb\u52a0\u4e00\u4e2a \u6587\u4ef6\u63cf\u8ff0\u7b26 *\/\n\n\/\/eventadd(efd, EPOLLIN, &g_events[MAX_EVENTS]);\nvoid eventadd(int efd, int events, struct myevent_s *ev)\n{\n    struct epoll_event epv = {0, {0}};\n    int op;\n    epv.data.ptr = ev;\n    epv.events = ev->events = events;       \/\/EPOLLIN \u6216 EPOLLOUT\n\n    if (ev->status == 0) {                                          \/\/\u5df2\u7ecf\u5728\u7ea2\u9ed1\u6811 g_efd \u91cc\n        op = EPOLL_CTL_ADD;                 \/\/\u5c06\u5176\u52a0\u5165\u7ea2\u9ed1\u6811 g_efd, \u5e76\u5c06status\u7f6e1\n        ev->status = 1;\n    }\n\n    if (epoll_ctl(efd, op, ev->fd, &epv) < 0)                       \/\/\u5b9e\u9645\u6dfb\u52a0\/\u4fee\u6539\n        printf(\"event add failed [fd=%d], events[%d]\\n\", ev->fd, events);\n    else\n        printf(\"event add OK [fd=%d], op=%d, events[%0X]\\n\", ev->fd, op, events);\n\n    return ;\n}\n\n\/* \u4eceepoll \u76d1\u542c\u7684 \u7ea2\u9ed1\u6811\u4e2d\u5220\u9664\u4e00\u4e2a \u6587\u4ef6\u63cf\u8ff0\u7b26*\/\n\nvoid eventdel(int efd, struct myevent_s *ev)\n{\n    struct epoll_event epv = {0, {0}};\n\n    if (ev->status != 1)                                        \/\/\u4e0d\u5728\u7ea2\u9ed1\u6811\u4e0a\n        return ;\n\n    \/\/epv.data.ptr = ev;\n    epv.data.ptr = NULL;\n    ev->status = 0;                                             \/\/\u4fee\u6539\u72b6\u6001\n    epoll_ctl(efd, EPOLL_CTL_DEL, ev->fd, &epv);                \/\/\u4ece\u7ea2\u9ed1\u6811 efd \u4e0a\u5c06 ev->fd \u6458\u9664\n\n    return ;\n}\n\n\/* \u5f53\u6709\u6587\u4ef6\u63cf\u8ff0\u7b26\u5c31\u7eea, epoll\u8fd4\u56de, \u8c03\u7528\u8be5\u51fd\u6570\u4e0e\u5ba2\u6237\u7aef\u5efa\u7acb\u94fe\u63a5 *\/\n\/* \u4e3acfd\u7684*ptr\u8d4b\u503c\u81ea\u5b9a\u4e49\u7ed3\u6784\u4f53\uff0c\u8bbe\u7f6e\u56de\u8c03\u51fd\u6570recvdata() \u9ed8\u8ba4\u5148\u8bfb *\/\nvoid acceptconn(int lfd, int events, void *arg)\n{\n    struct sockaddr_in cin;\n    socklen_t len = sizeof(cin);\n    int cfd, i;\n\n    if ((cfd = accept(lfd, (struct sockaddr *)&cin, &len)) == -1) {\n        if (errno != EAGAIN && errno != EINTR) {\n            \/* \u6682\u65f6\u4e0d\u505a\u51fa\u9519\u5904\u7406 *\/\n        }\n        printf(\"%s: accept, %s\\n\", __func__, strerror(errno));\n        return ;\n    }\n\n    do {\n        for (i = 0; i < MAX_EVENTS; i++)                                \/\/\u4ece\u5168\u5c40\u6570\u7ec4g_events\u4e2d\u627e\u4e00\u4e2a\u7a7a\u95f2\u5143\u7d20\n            if (g_events[i].status == 0)                                \/\/\u7c7b\u4f3c\u4e8eselect\u4e2d\u627e\u503c\u4e3a-1\u7684\u5143\u7d20\n                break;                                                  \/\/\u8df3\u51fa for\n\n        if (i == MAX_EVENTS) {\n            printf(\"%s: max connect limit[%d]\\n\", __func__, MAX_EVENTS);\n            break;                                                      \/\/\u8df3\u51fado while(0) \u4e0d\u6267\u884c\u540e\u7eed\u4ee3\u7801\n        }\n\n        int flag = 0;\n        if ((flag = fcntl(cfd, F_SETFL, O_NONBLOCK)) < 0) {             \/\/\u5c06cfd\u4e5f\u8bbe\u7f6e\u4e3a\u975e\u963b\u585e\n            printf(\"%s: fcntl nonblocking failed, %s\\n\", __func__, strerror(errno));\n            break;\n        }\n\n        \/* \u7ed9cfd\u8bbe\u7f6e\u4e00\u4e2a myevent_s \u7ed3\u6784\u4f53, \u56de\u8c03\u51fd\u6570 \u8bbe\u7f6e\u4e3a recvdata *\/\n        eventset(&g_events[i], cfd, recvdata, &g_events[i]);   \n        eventadd(g_efd, EPOLLIN, &g_events[i]);                         \/\/\u5c06cfd\u6dfb\u52a0\u5230\u7ea2\u9ed1\u6811g_efd\u4e2d,\u76d1\u542c\u8bfb\u4e8b\u4ef6\n\n    } while(0);\n\n    printf(\"new connect [%s:%d][time:%ld], pos[%d]\\n\", \n            inet_ntoa(cin.sin_addr), ntohs(cin.sin_port), g_events[i].last_active, i);\n    return ;\n}\n\n\/* \u8bfb\u6570\u636e \u5e76\u628a\u8be5fd\u7684\u56de\u8c03\u51fd\u6570\u6539\u4e3asenddata() *\/\nvoid recvdata(int fd, int events, void *arg)\n{\n    struct myevent_s *ev = (struct myevent_s *)arg;\n    int len;\n\n    len = recv(fd, ev->buf, sizeof(ev->buf), 0);            \/\/\u8bfb\u6587\u4ef6\u63cf\u8ff0\u7b26, \u6570\u636e\u5b58\u5165myevent_s\u6210\u5458buf\u4e2d\n\n    eventdel(g_efd, ev);        \/\/\u5c06\u8be5\u8282\u70b9\u4ece\u7ea2\u9ed1\u6811\u4e0a\u6458\u9664\n\n    if (len > 0) {\n\n        ev->len = len;\n        ev->buf[len] = '\\0';                                \/\/\u624b\u52a8\u6dfb\u52a0\u5b57\u7b26\u4e32\u7ed3\u675f\u6807\u8bb0\n        printf(\"C[%d]:%s\\n\", fd, ev->buf);\n\n        eventset(ev, fd, senddata, ev);                     \/\/\u8bbe\u7f6e\u8be5 fd \u5bf9\u5e94\u7684\u56de\u8c03\u51fd\u6570\u4e3a senddata\n        eventadd(g_efd, EPOLLOUT, ev);                      \/\/\u5c06fd\u52a0\u5165\u7ea2\u9ed1\u6811g_efd\u4e2d,\u76d1\u542c\u5176\u5199\u4e8b\u4ef6\n\n    } else if (len == 0) {\n        close(ev->fd);\n        \/* ev-g_events \u5730\u5740\u76f8\u51cf\u5f97\u5230\u504f\u79fb\u5143\u7d20\u4f4d\u7f6e *\/\n        printf(\"[fd=%d] pos[%ld], closed\\n\", fd, ev-g_events);\n    } else {\n        close(ev->fd);\n        printf(\"recv[fd=%d] error[%d]:%s\\n\", fd, errno, strerror(errno));\n    }\n\n    return;\n}\n\n\/* \u5199\u6570\u636e \u5e76\u628a\u8be5fd\u7684\u56de\u8c03\u51fd\u6570\u6539\u4e3arecvdata() \u5982\u6b64\u5faa\u73af *\/\nvoid senddata(int fd, int events, void *arg)\n{\n    struct myevent_s *ev = (struct myevent_s *)arg;\n    int len;\n\n    len = send(fd, ev->buf, ev->len, 0);                    \/\/\u76f4\u63a5\u5c06\u6570\u636e \u56de\u5199\u7ed9\u5ba2\u6237\u7aef\u3002\u672a\u4f5c\u5904\u7406\n\n    eventdel(g_efd, ev);                                \/\/\u4ece\u7ea2\u9ed1\u6811g_efd\u4e2d\u79fb\u9664\n\n    if (len > 0) {\n\n        printf(\"send[fd=%d], [%d]%s\\n\", fd, len, ev->buf);\n        eventset(ev, fd, recvdata, ev);                     \/\/\u5c06\u8be5fd\u7684 \u56de\u8c03\u51fd\u6570\u6539\u4e3a recvdata\n        eventadd(g_efd, EPOLLIN, ev);                       \/\/\u4ece\u65b0\u6dfb\u52a0\u5230\u7ea2\u9ed1\u6811\u4e0a\uff0c \u8bbe\u4e3a\u76d1\u542c\u8bfb\u4e8b\u4ef6\n\n    } else {\n        close(ev->fd);                                      \/\/\u5173\u95ed\u94fe\u63a5\n        printf(\"send[fd=%d] error %s\\n\", fd, strerror(errno));\n    }\n\n    return ;\n}\n\n\/*\u521b\u5efa socket, \u521d\u59cb\u5316lfd \u4e3alfd\u7684*ptr\u8d4b\u503c\u81ea\u5b9a\u4e49\u7ed3\u6784\u4f53\uff0c\u8bbe\u7f6e\u56de\u8c03\u51fd\u6570acceptconn()*\/\n\nvoid initlistensocket(int efd, short port)\n{\n    struct sockaddr_in sin;\n\n    int lfd = socket(AF_INET, SOCK_STREAM, 0);\n    fcntl(lfd, F_SETFL, O_NONBLOCK);                                            \/\/\u5c06socket\u8bbe\u4e3a\u975e\u963b\u585e\n\n\tmemset(&sin, 0, sizeof(sin));                                               \/\/bzero(&sin, sizeof(sin))\n\tsin.sin_family = AF_INET;\n\tsin.sin_addr.s_addr = INADDR_ANY;\n\tsin.sin_port = htons(port);\n\n\tbind(lfd, (struct sockaddr *)&sin, sizeof(sin));\n\n\tlisten(lfd, 20);\n\n    \/* void eventset(struct myevent_s *ev, int fd, void (*call_back)(int, int, void *), void *arg);  *\/\n    eventset(&g_events[MAX_EVENTS], lfd, acceptconn, &g_events[MAX_EVENTS]);\n\n    \/* void eventadd(int efd, int events, struct myevent_s *ev) *\/\n    eventadd(efd, EPOLLIN, &g_events[MAX_EVENTS]);\n\n    return ;\n}\n\nint main(int argc, char *argv[])\n{\n    unsigned short port = SERV_PORT;\n\n    if (argc == 2)\n        port = atoi(argv[1]);                           \/\/\u4f7f\u7528\u7528\u6237\u6307\u5b9a\u7aef\u53e3.\u5982\u672a\u6307\u5b9a,\u7528\u9ed8\u8ba4\u7aef\u53e3\n\n    g_efd = epoll_create(MAX_EVENTS+1);                 \/\/\u521b\u5efa\u7ea2\u9ed1\u6811,\u8fd4\u56de\u7ed9\u5168\u5c40 g_efd \n    if (g_efd <= 0)\n        printf(\"create efd in %s err %s\\n\", __func__, strerror(errno));\n\n    initlistensocket(g_efd, port);                      \/\/\u521d\u59cb\u5316\u76d1\u542csocket\n\n    struct epoll_event events[MAX_EVENTS+1];            \/\/\u4fdd\u5b58\u5df2\u7ecf\u6ee1\u8db3\u5c31\u7eea\u4e8b\u4ef6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u6570\u7ec4 \n\tprintf(\"server running:port[%d]\\n\", port);\n\n    int checkpos = 0, i;\n    while (1) {\n        \/* \u8d85\u65f6\u9a8c\u8bc1\uff0c\u6bcf\u6b21\u6d4b\u8bd5100\u4e2a\u94fe\u63a5\uff0c\u4e0d\u6d4b\u8bd5listenfd \u5f53\u5ba2\u6237\u7aef60\u79d2\u5185\u6ca1\u6709\u548c\u670d\u52a1\u5668\u901a\u4fe1\uff0c\u5219\u5173\u95ed\u6b64\u5ba2\u6237\u7aef\u94fe\u63a5 *\/\n\n        long now = time(NULL);                          \/\/\u5f53\u524d\u65f6\u95f4\n        for (i = 0; i < 100; i++, checkpos++) {         \/\/\u4e00\u6b21\u5faa\u73af\u68c0\u6d4b100\u4e2a\u3002 \u4f7f\u7528checkpos\u63a7\u5236\u68c0\u6d4b\u5bf9\u8c61\n            if (checkpos == MAX_EVENTS)\n                checkpos = 0;\n            if (g_events[checkpos].status != 1)         \/\/\u4e0d\u5728\u7ea2\u9ed1\u6811 g_efd \u4e0a\n                continue;\n\n            long duration = now - g_events[checkpos].last_active;       \/\/\u5ba2\u6237\u7aef\u4e0d\u6d3b\u8dc3\u7684\u4e16\u95f4\n\n            if (duration >= 60) {\n                close(g_events[checkpos].fd);                           \/\/\u5173\u95ed\u4e0e\u8be5\u5ba2\u6237\u7aef\u94fe\u63a5\n                printf(\"[fd=%d] timeout\\n\", g_events[checkpos].fd);\n                eventdel(g_efd, &g_events[checkpos]);                   \/\/\u5c06\u8be5\u5ba2\u6237\u7aef \u4ece\u7ea2\u9ed1\u6811 g_efd\u79fb\u9664\n            }\n        }\n\n        \/*\u76d1\u542c\u7ea2\u9ed1\u6811g_efd, \u5c06\u6ee1\u8db3\u7684\u4e8b\u4ef6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u52a0\u81f3events\u6570\u7ec4\u4e2d, 1\u79d2\u6ca1\u6709\u4e8b\u4ef6\u6ee1\u8db3, \u8fd4\u56de 0*\/\n        int nfd = epoll_wait(g_efd, events, MAX_EVENTS+1, 1000);\n        if (nfd < 0) {\n            printf(\"epoll_wait error, exit\\n\");\n            break;\n        }\n\n        for (i = 0; i < nfd; i++) {\n            \/*\u4f7f\u7528\u81ea\u5b9a\u4e49\u7ed3\u6784\u4f53myevent_s\u7c7b\u578b\u6307\u9488, \u63a5\u6536 \u8054\u5408\u4f53data\u7684void *ptr\u6210\u5458*\/\n            struct myevent_s *ev = (struct myevent_s *)events[i].data.ptr;  \n\n            if ((events[i].events & EPOLLIN) && (ev->events & EPOLLIN)) {           \/\/\u8bfb\u5c31\u7eea\u4e8b\u4ef6\n                ev->call_back(ev->fd, events[i].events, ev->arg);\n                \/\/lfd  EPOLLIN  \n            }\n            if ((events[i].events & EPOLLOUT) && (ev->events & EPOLLOUT)) {         \/\/\u5199\u5c31\u7eea\u4e8b\u4ef6\n                ev->call_back(ev->fd, events[i].events, ev->arg);\n            }\n        }\n    }\n\n    \/* \u9000\u51fa\u524d\u91ca\u653e\u6240\u6709\u8d44\u6e90 *\/\n    return 0;\n}<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
                                                  \u591a\u8fdb\u7a0b\u5e76\u53d1\u670d\u52a1\u5668 \u601d\u8def \u2460Socket(); \u521b\u5efa\u76d1\u542c\u5957\u63a5\u5b57lfd\uff08\u9996\u5b57\u6bcd\u5927\u5199\u662f\u56e0\u4e3a\u8c03\u7528\u7684\u81ea\u5c01\u88c5\u51fd\u6570\uff09 \u2461Bi […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2,11],"tags":[56,21,59,58,50],"class_list":{"0":"post-1240","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"hentry","6":"category-linux","8":"tag-epoll","9":"tag-linux","10":"tag-select","11":"tag-58","12":"tag-50"},"_links":{"self":[{"href":"https:\/\/guapicoding.com\/index.php?rest_route=\/wp\/v2\/posts\/1240","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/guapicoding.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/guapicoding.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/guapicoding.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/guapicoding.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1240"}],"version-history":[{"count":79,"href":"https:\/\/guapicoding.com\/index.php?rest_route=\/wp\/v2\/posts\/1240\/revisions"}],"predecessor-version":[{"id":2030,"href":"https:\/\/guapicoding.com\/index.php?rest_route=\/wp\/v2\/posts\/1240\/revisions\/2030"}],"wp:attachment":[{"href":"https:\/\/guapicoding.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1240"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/guapicoding.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1240"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/guapicoding.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1240"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}