{"id":101711,"date":"2026-09-07T10:09:10","date_gmt":"2026-09-07T02:09:10","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/101711.html"},"modified":"2026-09-07T10:09:10","modified_gmt":"2026-09-07T02:09:10","slug":"linux%e7%bd%91%e7%bb%9c%e7%bc%96%e7%a8%8b04-tcp%e5%b9%b6%e5%8f%91%e6%9c%8d%e5%8a%a1%e5%99%a8","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/101711.html","title":{"rendered":"Linux\u7f51\u7edc\u7f16\u7a0b04-TCP\u5e76\u53d1\u670d\u52a1\u5668"},"content":{"rendered":"<h2>\u4e00. \u5e76\u53d1\u670d\u52a1\u5668\u4ecb\u7ecd<\/h2>\n<p>\u2460 <span style=\"color:#956fe7\">\u5355\u5faa\u73af\u670d\u52a1\u5668&#xff1a;\u4e00\u6b21\u53ea\u80fd\u5904\u7406\u4e00\u4e2a\u5ba2\u6237\u7aef\u4efb\u52a1\u7684\u670d\u52a1\u5668\u3002<\/span><br \/>\n\u2461 <span style=\"color:#956fe7\">\u5e76\u53d1\u670d\u52a1\u5668&#xff1a;\u80fd\u591f\u540c\u65f6\u5904\u7406\u591a\u4e2a\u5ba2\u6237\u7aef\u4efb\u52a1\u7684\u670d\u52a1\u5668\u3002<\/span><\/p>\n<p>\u2462\u00a0<span style=\"color:#fe2c24\">TCP\u5e76\u53d1\u670d\u52a1\u7aef&#xff1a;<\/span><\/p>\n<ul>\n<li>\u591a\u8fdb\u7a0b&#xff1a;\u5b89\u5168\u3001\u8d44\u6e90\u5f00\u9500\u5927\u3001\u5e76\u53d1\u91cf\u5c0f<\/li>\n<li>\u591a\u7ebf\u7a0b&#xff1a;\u76f8\u5bf9\u8fdb\u7a0b\u8d44\u6e90\u5f00\u9500\u5c0f&#xff0c;\u76f8\u5bf9\u5e76\u53d1\u91cf\u5927&#xff0c;\u7cfb\u7edf\u6709\u5d29\u6e83\u7684\u98ce\u9669<\/li>\n<li>\u7ebf\u7a0b\u6c60&#xff1a;\u63d0\u524d\u521b\u5efa\u597d\u5927\u91cf\u7ebf\u7a0b\u7ba1\u7406\u8d77\u6765&#xff0c;\u907f\u514d\u53cd\u590d\u521b\u5efa\u7ebf\u7a0b\u5e26\u6765\u65f6\u95f4\u6d88\u8017&#xff08;\u8bbe\u8ba1\u6a21\u5f0f&#xff1a;\u751f\u4ea7\u8005&#8211;\u6d88\u8d39\u8005 &#xff09;\u3002<\/li>\n<li>IO\u591a\u8def\u590d\u7528&#xff1a;\u00a0\u5bf9\u591a\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u76d1\u6d4b(select\/poll\/epoll)&#xff0c;\u590d\u7528\u4e00\u4e2a\u8fdb\u7a0b\u3002(\u6587\u4ef6 &#8211;&gt; fd)<\/li>\n<\/ul>\n<p>\u2463 \u4f7f\u7528\u591a\u7ebf\u7a0b\u5b9e\u73b0\u5e76\u53d1\u670d\u52a1\u5668<\/p>\n<p>\/\/client.c<br \/>\n#include &#034;head.h&#034;<br \/>\n#define SER_ADDR    &#034;192.168.0.138&#034;<br \/>\n#define SER_PORT    50000<br \/>\nint CreateTcpConnection(char *pIp, int Port)<br \/>\n{<br \/>\n    int sockfd &#061; 0;<br \/>\n    int ret &#061; 0;<br \/>\n    struct sockaddr_in seraddr;<br \/>\n    sockfd &#061; socket(AF_INET, SOCK_STREAM, 0);<br \/>\n    if (-1 &#061;&#061; sockfd)<br \/>\n    {<br \/>\n        perror(&#034;fail to socket&#034;);<br \/>\n        return -1;<br \/>\n    }<br \/>\n    seraddr.sin_family &#061; AF_INET;<br \/>\n    seraddr.sin_port &#061; htons(Port);<br \/>\n    seraddr.sin_addr.s_addr &#061; inet_addr(pIp);<br \/>\n    ret &#061; connect(sockfd, (struct sockaddr *)&amp;seraddr, sizeof(seraddr));<br \/>\n    if (-1 &#061;&#061; ret)<br \/>\n    {<br \/>\n        perror(&#034;fail to connect&#034;);<br \/>\n        return -1;<br \/>\n    }<br \/>\n    return sockfd;<br \/>\n}<br \/>\nint main(void)<br \/>\n{<br \/>\n    int sockfd &#061; 0;<br \/>\n    char tmpbuff[4096] &#061; {0};<br \/>\n    int cnt &#061; 0;<br \/>\n    ssize_t nret &#061; 0;<br \/>\n    sockfd &#061; CreateTcpConnection(SER_ADDR, SER_PORT);<br \/>\n    while (1)<br \/>\n    {<br \/>\n        sprintf(tmpbuff, &#034;hello world &#8212;- %d&#034;, cnt);<br \/>\n        cnt&#043;&#043;;<br \/>\n        nret &#061; send(sockfd, tmpbuff, strlen(tmpbuff), 0);<br \/>\n        if (-1 &#061;&#061; nret)<br \/>\n        {<br \/>\n            perror(&#034;fail to send&#034;);<br \/>\n            return -1;<br \/>\n        }<br \/>\n        memset(tmpbuff, 0, sizeof(tmpbuff));<br \/>\n        nret &#061; recv(sockfd, tmpbuff, sizeof(tmpbuff), 0);<br \/>\n        if (-1 &#061;&#061; nret)<br \/>\n        {<br \/>\n            perror(&#034;fail to recv&#034;);<br \/>\n            return -1;<br \/>\n        }<br \/>\n        else if (0 &#061;&#061; nret)<br \/>\n        {<br \/>\n            break;<br \/>\n        }<br \/>\n        printf(&#034;RECV:%s\\\\n&#034;, tmpbuff);<br \/>\n        sleep(1);<br \/>\n    }<br \/>\n    close(sockfd);<br \/>\n    return 0;<br \/>\n}<\/p>\n<p>\/\/server.c<br \/>\n#include &#034;head.h&#034;<br \/>\n#define SER_ADDR    &#034;192.168.0.138&#034;<br \/>\n#define SER_PORT    50000<br \/>\nint CreateListenSocket(char *pIp, int Port)<br \/>\n{<br \/>\n    int sockfd &#061; 0;<br \/>\n    int ret &#061; 0;<br \/>\n    struct sockaddr_in seraddr;<br \/>\n    sockfd &#061; socket(AF_INET, SOCK_STREAM, 0);<br \/>\n    if (-1 &#061;&#061; sockfd)<br \/>\n    {<br \/>\n        perror(&#034;fail to socket&#034;);<br \/>\n        return -1;<br \/>\n    }<br \/>\n    seraddr.sin_family &#061; AF_INET;<br \/>\n    seraddr.sin_port &#061; htons(Port);<br \/>\n    seraddr.sin_addr.s_addr &#061; inet_addr(pIp);<br \/>\n    ret &#061; bind(sockfd, (struct sockaddr *)&amp;seraddr, sizeof(seraddr));<br \/>\n    if (-1 &#061;&#061; ret)<br \/>\n    {<br \/>\n        perror(&#034;fail to bind&#034;);<br \/>\n        return -1;<br \/>\n    }<br \/>\n    ret &#061; listen(sockfd, 10);<br \/>\n    if (-1 &#061;&#061; ret)<br \/>\n    {<br \/>\n        perror(&#034;fail to listen&#034;);<br \/>\n        return -1;<br \/>\n    }<br \/>\n    return sockfd;<br \/>\n}<br \/>\nvoid *handerclientfun(void *arg)<br \/>\n{<br \/>\n    char tmpbuff[4096] &#061; {0};<br \/>\n    ssize_t nret &#061; 0;<br \/>\n    int confd &#061; (int)arg;<br \/>\n    while (1)<br \/>\n    {<br \/>\n        memset(tmpbuff, 0, sizeof(tmpbuff));<br \/>\n        nret &#061; recv(confd, tmpbuff, sizeof(tmpbuff), 0);<br \/>\n        if (-1 &#061;&#061; nret)<br \/>\n        {<br \/>\n            perror(&#034;fail to recv&#034;);<br \/>\n            return NULL;<br \/>\n        }<br \/>\n        else if (0 &#061;&#061; nret)<br \/>\n        {<br \/>\n            break;<br \/>\n        }<br \/>\n        printf(&#034;RECV:%s\\\\n&#034;, tmpbuff);<br \/>\n        sprintf(tmpbuff, &#034;%s &#8212; echo&#034;, tmpbuff);<br \/>\n        nret &#061; send(confd, tmpbuff, strlen(tmpbuff), 0);<br \/>\n        if (-1 &#061;&#061; nret)<br \/>\n        {<br \/>\n            perror(&#034;fail to send&#034;);<br \/>\n            return NULL;<br \/>\n        }<br \/>\n    }<br \/>\n    return NULL;<br \/>\n}<br \/>\nint main(void)<br \/>\n{<br \/>\n    int sockfd &#061; 0;<br \/>\n    int confd &#061; 0;<br \/>\n    pthread_t tid;<br \/>\n    sockfd &#061; CreateListenSocket(SER_ADDR, SER_PORT);<br \/>\n    while (1)<br \/>\n    {<br \/>\n        confd &#061; accept(sockfd, NULL, NULL);<br \/>\n        if (-1 &#061;&#061; confd)<br \/>\n        {<br \/>\n            perror(&#034;fail to accept&#034;);<br \/>\n            return -1;<br \/>\n        }<br \/>\n        pthread_create(&amp;tid, NULL, handerclientfun, (void *)confd);<br \/>\n    }<br \/>\n    close(confd);<br \/>\n    close(sockfd);<br \/>\n    return 0;<br \/>\n}<\/p>\n<h2>\u4e8c\u3001Linux\u5e38\u7528IO\u6a21\u578b<\/h2>\n<h3>2.1\u00a0\u963b\u585eIO&#xff08;\u9ed8\u8ba4&#xff09;<\/h3>\n<p>\u2460\u00a0\u6548\u7387\u9ad8&#xff0c;\u8c03\u7528\u00a0fgets\/read\/fread\/recv\u00a0\/accept\u7b49\u51fd\u6570&#xff0c;\u5982\u679c\u6587\u4ef6\u5f53\u524d\u65e0\u6570\u636e\u53ef\u8bfb\u6216\u8005\u6ca1\u6709\u6570\u636e\u5230\u8fbe\u65f6&#xff0c;\u90a3\u4e48\u8c03\u7528\u8005\u5c06\u5e94\u7528\u7a0b\u5e8f\u6302\u8d77\u3001\u8fdb\u5165\u4f11\u7720\u963b\u585e\u72b6\u6001&#xff0c;\u76f4\u5230\u6709\u6570\u636e\u53ef\u8bfb\u65f6\u624d\u4f1a\u89e3\u9664\u963b\u585e&#xff0c;\u4e0d\u5360\u7528 CPU&#xff1b;<\/p>\n<p>\/\/read.c<br \/>\n#include &#034;head.h&#034;<br \/>\nint main(void)<br \/>\n{<br \/>\n    int fd &#061; 0;<br \/>\n    char tmpbuff[4096] &#061; {0};<br \/>\n    mkfifo(&#034;\/tmp\/myfifo&#034;, 0664);<br \/>\n    fd &#061; open(&#034;\/tmp\/myfifo&#034;, O_RDONLY);<br \/>\n    if (-1 &#061;&#061; fd)<br \/>\n    {<br \/>\n        perror(&#034;fail to open&#034;);<br \/>\n        return -1;<br \/>\n    }<br \/>\n    while (1)<br \/>\n    {<br \/>\n        memset(tmpbuff, 0, sizeof(tmpbuff));<br \/>\n        read(fd, tmpbuff, sizeof(tmpbuff)); \/\/\u6570\u636e\u6ca1\u6765\u4f1a\u963b\u585e<br \/>\n        printf(&#034;FIFO:%s\\\\n&#034;, tmpbuff);<br \/>\n        memset(tmpbuff, 0, sizeof(tmpbuff));<br \/>\n        gets(tmpbuff);<br \/>\n        printf(&#034;STDIN:%s\\\\n&#034;, tmpbuff);<br \/>\n    }<br \/>\n    close(fd);<br \/>\n    return 0;<br \/>\n}<\/p>\n<p>\/\/write.c<br \/>\n#include &#034;head.h&#034;<br \/>\nint main(void)<br \/>\n{<br \/>\n    int fd &#061; 0;<br \/>\n    char tmpbuff[4096] &#061; {0};<br \/>\n    mkfifo(&#034;\/tmp\/myfifo&#034;, 0664);<br \/>\n    fd &#061; open(&#034;\/tmp\/myfifo&#034;, O_WRONLY);<br \/>\n    if (-1 &#061;&#061; fd)<br \/>\n    {<br \/>\n        perror(&#034;fail to open&#034;);<br \/>\n        return -1;<br \/>\n    }<br \/>\n    while (1)<br \/>\n    {<br \/>\n        gets(tmpbuff);<br \/>\n        write(fd, tmpbuff, strlen(tmpbuff));<br \/>\n        if (0 &#061;&#061; strcmp(tmpbuff, &#034;.quit&#034;))<br \/>\n        {<br \/>\n            break;<br \/>\n        }<br \/>\n    }<br \/>\n    close(fd);<br \/>\n    return 0;<br \/>\n}<\/p>\n<h3>2.2 \u975e\u963b\u585eIO<\/h3>\n<p>\u2460 \u628a\u6587\u4ef6\u63cf\u8ff0\u7b26\u8bbe\u7f6e\u4e3a\u975e\u963b\u585e&#xff0c;\u6548\u7387\u4f4e&#xff0c;\u56e0\u4e3a\u6ca1\u6709\u6570\u636e\u65f6&#xff0c; CPU\u4e5f\u4f1a\u5728\u4efb\u52a1\u4e2d\u6267\u884c\u4ee3\u7801&#xff0c;\u8f6e\u8be2\u68c0\u6d4b\u6570\u636e\u662f\u5426\u5230\u6765&#xff0c;\u6d6a\u8d39CPU\u8d44\u6e90<\/p>\n<p>\u2461 fcntl\u51fd\u6570<\/p>\n<p>int fcntl(int fd, int cmd, &#8230; \/* arg *\/ );<br \/>\n\u529f\u80fd&#xff1a;\u5bf9\u5df2\u6253\u5f00\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26 fd \u6267\u884c\u5404\u7c7b\u63a7\u5236\u64cd\u4f5c&#xff0c;\u5177\u4f53\u64cd\u4f5c\u7531 cmd \u6307\u5b9a\u3002<br \/>\n\u53c2\u6570&#xff1a;<br \/>\n    fd&#xff1a;\u8981\u64cd\u4f5c\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff08;\u666e\u901a\u6587\u4ef6\u3001socket\u3001\u7ba1\u9053\u3001FIFO \u90fd\u652f\u6301&#xff09;<br \/>\n    cmd&#xff1a;\u63a7\u5236\u547d\u4ee4&#xff08;\u51b3\u5b9a\u7b2c\u4e09\u4e2a\u53c2\u6570\u662f\u5426\u5b58\u5728\u3001\u7c7b\u578b&#xff09;<br \/>\n    arg&#xff1a;\u53ef\u9009\u53c2\u6570&#xff0c;\u968f cmd \u53d8\u5316&#xff08;\u6574\u6570 \/ \u7ed3\u6784\u4f53\u6307\u9488&#xff09;<br \/>\n\u8fd4\u56de\u503c&#xff1a;<br \/>\n    \u5931\u8d25-1\u4e14errno<br \/>\n    \u6210\u529f&#xff1a;\u4e0d\u540c\u7684cmd\u8fd4\u56de\u503c\u4e0d\u4e00\u6837<\/p>\n<p>\/\/read.c write.c\u540c\u4e0a<br \/>\n#include &#034;head.h&#034;<br \/>\nint main(void)<br \/>\n{<br \/>\n    int fd &#061; 0;<br \/>\n    char tmpbuff[4096] &#061; {0};<br \/>\n    int flags &#061; 0;<br \/>\n    char *pret &#061; 0;<br \/>\n    ssize_t nret &#061; 0;<br \/>\n    mkfifo(&#034;\/tmp\/myfifo&#034;, 0664);<br \/>\n    fd &#061; open(&#034;\/tmp\/myfifo&#034;, O_RDONLY);<br \/>\n    if (-1 &#061;&#061; fd)<br \/>\n    {<br \/>\n        perror(&#034;fail to open&#034;);<br \/>\n        return -1;<br \/>\n    }<br \/>\n    \/\/\u83b7\u5f97fd\u6587\u4ef6\u63cf\u8ff0\u7b26\u5bf9\u5e94\u7684\u5c5e\u6027<br \/>\n    flags &#061; fcntl(fd, F_GETFL);<br \/>\n    \/\/\u5728\u5f53\u524d\u5c5e\u6027\u7684\u57fa\u7840\u4e0a\u52a0\u4e0a\u975e\u963b\u585e\u5c5e\u6027<br \/>\n    flags |&#061; O_NONBLOCK;<br \/>\n    \/\/\u518d\u5c06\u65b0\u5c5e\u6027\u8bbe\u7f6e\u5230\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e2d<br \/>\n    fcntl(fd, F_SETFL, flags);<br \/>\n    flags &#061; fcntl(0, F_GETFL);<br \/>\n    flags |&#061; O_NONBLOCK;<br \/>\n    fcntl(0, F_SETFL, flags);<br \/>\n    while (1)<br \/>\n    {<br \/>\n        memset(tmpbuff, 0, sizeof(tmpbuff));<br \/>\n        nret &#061; read(fd, tmpbuff, sizeof(tmpbuff));<br \/>\n        if (nret &gt; 0)   \/\/\u6709\u6570\u636e\u624d\u4f1a\u89e6\u53d1<br \/>\n        {<br \/>\n            printf(&#034;FIFO:%s\\\\n&#034;, tmpbuff);<br \/>\n        }<br \/>\n        memset(tmpbuff, 0, sizeof(tmpbuff));<br \/>\n        pret &#061; gets(tmpbuff);\/\/\u6709\u6570\u636e\u624d\u4f1a\u89e6\u53d1<br \/>\n        if (pret !&#061; NULL)<br \/>\n        {<br \/>\n            printf(&#034;STDIN:%s\\\\n&#034;, tmpbuff);<br \/>\n        }<br \/>\n    }<br \/>\n    close(fd);<br \/>\n    return 0;<br \/>\n}<\/p>\n<h3>2.3\u00a0\u4fe1\u53f7\u9a71\u52a8IO&#xff08;\u5f02\u6b65IO&#xff09;<\/h3>\n<p>\u2460 \u6548\u7387\u9ad8<br \/>\n\u2461 \u9a71\u52a8\u7684\u4fe1\u53f7\u4e2a\u6570\u6709\u9650&#xff0c;\u5e94\u7528\u5c42\u65e0\u6cd5\u533a\u5206\u591a\u4e2aIO\u4e8b\u4ef6<br \/>\n\u2462 <span style=\"color:#956fe7\">\u5b9e\u73b0\u65b9\u6cd5&#xff1a;<\/span>\u5c06\u6587\u4ef6\u63cf\u8ff0\u7b26\u8bbe\u7f6e\u4e3a\u5f02\u6b65IO\u5e76\u6307\u5b9a\u5f02\u6b65IO\u901a\u77e5\u8fdb\u7a0b\u5bf9\u8c61&#xff0c;\u5185\u6838\u76d1\u6d4b\u6587\u4ef6\u63cf\u8ff0\u7b26\u662f\u5426\u6709\u4e8b\u4ef6\u53d1\u751f&#xff0c;\u5f53\u6709\u4e8b\u4ef6\u53d1\u751f\u65f6\u901a\u77e5\u7528\u6237\u5c42&#xff0c;\u7528\u6237\u5c42\u53ef\u4ee5\u6355\u6349SIGIO\u4fe1\u53f7\u6765\u5904\u7406\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u4e8b\u4ef6<\/p>\n<p>\/\/read.c write.c\u540c\u4e0a<br \/>\n#include &#034;head.h&#034;<br \/>\nint fd &#061; 0;<br \/>\nvoid handler(int signo)<br \/>\n{<br \/>\n    char tmpbuff[4096] &#061; {0};<br \/>\n    memset(tmpbuff, 0, sizeof(tmpbuff));<br \/>\n    read(fd, tmpbuff, sizeof(tmpbuff));<br \/>\n    printf(&#034;FIFO:%s\\\\n&#034;, tmpbuff);<br \/>\n    return;<br \/>\n}<br \/>\nint main(void)<br \/>\n{<br \/>\n    int flags &#061; 0;<br \/>\n    char tmpbuff[4096] &#061; {0};<br \/>\n    signal(SIGIO, handler);<br \/>\n    mkfifo(&#034;\/tmp\/myfifo&#034;, 0664);<br \/>\n    fd &#061; open(&#034;\/tmp\/myfifo&#034;, O_RDONLY);<br \/>\n    if (-1 &#061;&#061; fd)<br \/>\n    {<br \/>\n        perror(&#034;fail to open&#034;);<br \/>\n        return -1;<br \/>\n    }<br \/>\n    \/\/\u5728\u6587\u4ef6\u63cf\u8ff0\u7b26\u539f\u6765\u7684\u6807\u5fd7\u4f4d\u57fa\u7840\u4e0a\u65b0\u589eO_ASYNC&#xff0c;\u5f02\u6b65IO\u6807\u5fd7<br \/>\n    flags &#061; fcntl(fd, F_GETFL);<br \/>\n    flags |&#061; O_ASYNC;<br \/>\n    fcntl(fd, F_SETFL, flags);<br \/>\n    \/\/\u6307\u5b9a\u5f02\u6b65IO\u7ed9\u5f53\u524d\u8fdb\u7a0b\u53d1\u9001\u4fe1\u53f7<br \/>\n    fcntl(fd, F_SETOWN, getpid());<br \/>\n    while (1)<br \/>\n    {<br \/>\n        memset(tmpbuff, 0, sizeof(tmpbuff));<br \/>\n        gets(tmpbuff);<br \/>\n        printf(&#034;STDIN:%s\\\\n&#034;, tmpbuff);<br \/>\n    }<br \/>\n    close(fd);<br \/>\n    return 0;<br \/>\n}<\/p>\n<h3>2.4\u00a0IO\u591a\u8def\u590d\u7528(select\/poll\/epoll)<\/h3>\n<h4>2.4.1\u00a0select<\/h4>\n<p>\u2460 \u5728\u4e00\u4e2a\u8fdb\u7a0b\u4e2d&#xff0c;\u540c\u65f6\u76d1\u6d4b\u591a\u4e2aIO\u3002<\/p>\n<p>\u2461 \u8c03\u7528 select()\u4f1a\u4e00\u76f4\u963b\u585e&#xff0c;\u76f4\u5230\u67d0\u4e00\u4e2a\u6216\u591a\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u6210\u4e3a\u5c31\u7eea\u6001&#xff08;\u53ef\u4ee5\u8bfb\u6216\u5199&#xff09;\u3002<br \/>\n\u2462 <span style=\"color:#956fe7\">\u6b65\u9aa4&#xff1a;<\/span><\/p>\n<ul>\n<li>\u521b\u5efa\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408<\/li>\n<li>\u6dfb\u52a0\u9700\u8981\u76d1\u6d4b\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u5230\u96c6\u5408<\/li>\n<li>\u901a\u77e5\u5185\u6838\u5f00\u59cb\u76d1\u6d4b<\/li>\n<li>\u7531IO\u4e8b\u4ef6\u5230\u8fbe\u65f6&#xff0c;\u76d1\u6d4b\u8fd4\u56de\u7ed3\u679c<\/li>\n<\/ul>\n<p>\u2463 <span style=\"color:#fe2c24\">\u4f7f\u7528\u65b9\u6cd5&#xff1a;<\/span><span style=\"color:#956fe7\">select\u4f1a\u76d1\u542c\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408&#xff0c;\u5f53\u96c6\u5408\u4e2d\u81f3\u5c11\u6709\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u4ea7\u751f\u4e8b\u4ef6\u65f6&#xff0c;select\u4e0d\u518d\u963b\u585e&#xff0c;\u5b83\u4f1a\u5c06\u4ea7\u751f\u4e8b\u4ef6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u7559\u5728\u96c6\u5408\u4e2d&#xff0c;\u628a\u6ca1\u6709\u4ea7\u751f\u4e8b\u4ef6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u4ece\u96c6\u5408\u4e2d\u53bb\u9664\u3002<\/span><\/p>\n<p><span style=\"color:#fe2c24\">\u2464 \u51fd\u6570\u63a5\u53e3<\/span><\/p>\n<p>void FD_CLR(int fd, fd_set *set);<br \/>\n\u529f\u80fd&#xff1a;\u5c06\u6587\u4ef6\u63cf\u8ff0\u7b26fd\u4ece\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408\u4e2d\u6e05\u9664<br \/>\nint FD_ISSET(int fd, fd_set *set);<br \/>\n\u529f\u80fd&#xff1a;\u5224\u65ad\u6587\u4ef6\u63cf\u8ff0\u7b26fd\u662f\u5426\u4ecd\u5728\u96c6\u5408\u4e2d<br \/>\nvoid FD_SET(int fd, fd_set *set);<br \/>\n\u529f\u80fd&#xff1a;\u5c06\u6587\u4ef6\u63cf\u8ff0\u7b26fd\u52a0\u5165\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408\u4e2d<br \/>\nvoid FD_ZERO(fd_set *set);<br \/>\n\u529f\u80fd&#xff1a;\u5c06\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408\u6e050<br \/>\nint select(int nfds, fd_set *readfds, fd_set *writefds,<br \/>\nfd_set *exceptfds, struct timeval *timeout);<br \/>\n\u529f\u80fd&#xff1a;\u901a\u77e5\u5185\u6838\u76d1\u542c\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408\u4e2d\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u662f\u5426\u4ea7\u751f\u4e8b\u4ef6<br \/>\n\u53c2\u6570&#xff1a;<br \/>\n    nfds:\u96c6\u5408\u4e2d\u6700\u5927\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u503c&#043;1<br \/>\n    readfds:\u8bfb\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408<br \/>\n    writefds:\u5199\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408<br \/>\n    exceptfds:\u5176\u4f59\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408<br \/>\n    timeout:\u8d85\u65f6\u65f6\u95f4<br \/>\n        NULL&#xff1a; \u963b\u585e\u7b49\u5f85<br \/>\n\u8fd4\u56de\u503c&#xff1a;<br \/>\n    \u6210\u529f\u8fd4\u56de\u5b9e\u9645\u4ea7\u751f\u4e8b\u4ef6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e2a\u6570<br \/>\n    \u5931\u8d25\u8fd4\u56de-1<br \/>\n    \u65f6\u95f4\u8fbe\u5230\u6ca1\u6709\u4e8b\u4ef6\u53d1\u751f\u8fd4\u56de0<\/p>\n<p>\u7ec3\u4e601&#xff1a;\u4f7f\u7528\u7ba1\u9053\u5b9e\u73b0select<\/p>\n<p>\/\/read.c write.c  \u540c\u4e0a<br \/>\n#include &#034;head.h&#034;<br \/>\nint main(void)<br \/>\n{<br \/>\n    int fd &#061; 0;<br \/>\n    char tmpbuff[4096] &#061; {0};<br \/>\n    fd_set rdfds; \/\/\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408<br \/>\n    fd_set tmpfds;\/\/\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408<br \/>\n    int maxfd &#061; 0;<br \/>\n    int nready &#061; 0;<br \/>\n    mkfifo(&#034;\/tmp\/myfifo&#034;, 0664);<br \/>\n    fd &#061; open(&#034;\/tmp\/myfifo&#034;, O_RDONLY);<br \/>\n    if (-1 &#061;&#061; fd)<br \/>\n    {<br \/>\n        perror(&#034;fail to open&#034;);<br \/>\n        return -1;<br \/>\n    }<br \/>\n    FD_ZERO(&amp;rdfds);<br \/>\n    FD_SET(fd, &amp;rdfds); \/\/\u5c06fd\u6587\u4ef6\u63cf\u8ff0\u7b26\u52a0\u5165\u5230\u96c6\u5408\u4e2d<br \/>\n    FD_SET(0, &amp;rdfds);\/\/\u5c060\u6587\u4ef6\u63cf\u8ff0\u7b26\u52a0\u5165\u5230\u96c6\u5408\u4e2d<br \/>\n    maxfd &#061; fd;<br \/>\n    while (1)<br \/>\n    {<br \/>\n        tmpfds &#061; rdfds;<br \/>\n        nready &#061; select(maxfd&#043;1, &amp;tmpfds, NULL, NULL, NULL);<br \/>\n        if (-1 &#061;&#061; nready)<br \/>\n        {<br \/>\n            perror(&#034;fail to select&#034;);<br \/>\n            return -1;<br \/>\n        }<br \/>\n        if (FD_ISSET(fd, &amp;tmpfds)) \/\/fd\u5728\u96c6\u5408\u4e2d&#xff0c;\u4f1a\u79fb\u96640<br \/>\n        {<br \/>\n            memset(tmpbuff, 0, sizeof(tmpbuff));<br \/>\n            read(fd, tmpbuff, sizeof(tmpbuff));<br \/>\n            printf(&#034;FIFO:%s\\\\n&#034;, tmpbuff);<br \/>\n        }<br \/>\n        else if (FD_ISSET(0, &amp;tmpfds)) \/\/0\u5728\u96c6\u5408\u4e2d&#xff0c;\u4f1a\u79fb\u9664fd<br \/>\n        {<br \/>\n            memset(tmpbuff, 0, sizeof(tmpbuff));<br \/>\n            gets(tmpbuff);<br \/>\n            printf(&#034;STDIN:%s\\\\n&#034;, tmpbuff);<br \/>\n        }<br \/>\n    }<br \/>\n    close(fd);<br \/>\n    return 0;<br \/>\n}<\/p>\n<p>\u7ec3\u4e602&#xff1a;\u901a\u8fc7select\u5b9e\u73b0TCP\u5e76\u53d1\u670d\u52a1\u5668\u6a21\u578b&#xff0c;\u5141\u8bb8\u591a\u4e2a\u5ba2\u6237\u7aef\u540c\u65f6\u8bbf\u95ee\u670d\u52a1\u5668<\/p>\n<p>\/\/client.c<br \/>\n#include &#034;head.h&#034;<br \/>\n#define SER_ADDR    &#034;192.168.0.138&#034;<br \/>\n#define SER_PORT    50000<br \/>\nint CreateTcpConnection(char *pIp, int Port)<br \/>\n{<br \/>\n    int sockfd &#061; 0;<br \/>\n    int ret &#061; 0;<br \/>\n    struct sockaddr_in seraddr;<br \/>\n    sockfd &#061; socket(AF_INET, SOCK_STREAM, 0);<br \/>\n    if (-1 &#061;&#061; sockfd)<br \/>\n    {<br \/>\n        perror(&#034;fail to socket&#034;);<br \/>\n        return -1;<br \/>\n    }<br \/>\n    seraddr.sin_family &#061; AF_INET;<br \/>\n    seraddr.sin_port &#061; htons(Port);<br \/>\n    seraddr.sin_addr.s_addr &#061; inet_addr(pIp);<br \/>\n    ret &#061; connect(sockfd, (struct sockaddr *)&amp;seraddr, sizeof(seraddr));<br \/>\n    if (-1 &#061;&#061; ret)<br \/>\n    {<br \/>\n        perror(&#034;fail to connect&#034;);<br \/>\n        return -1;<br \/>\n    }<br \/>\n    return sockfd;<br \/>\n}<br \/>\nint main(void)<br \/>\n{<br \/>\n    int sockfd &#061; 0;<br \/>\n    char tmpbuff[4096] &#061; {0};<br \/>\n    int cnt &#061; 0;<br \/>\n    ssize_t nret &#061; 0;<br \/>\n    sockfd &#061; CreateTcpConnection(SER_ADDR, SER_PORT);<br \/>\n    while (1)<br \/>\n    {<br \/>\n        sprintf(tmpbuff, &#034;hello world &#8212;- %d&#034;, cnt);<br \/>\n        cnt&#043;&#043;;<br \/>\n        nret &#061; send(sockfd, tmpbuff, strlen(tmpbuff), 0);<br \/>\n        if (-1 &#061;&#061; nret)<br \/>\n        {<br \/>\n            perror(&#034;fail to send&#034;);<br \/>\n            return -1;<br \/>\n        }<br \/>\n        memset(tmpbuff, 0, sizeof(tmpbuff));<br \/>\n        nret &#061; recv(sockfd, tmpbuff, sizeof(tmpbuff), 0);<br \/>\n        if (-1 &#061;&#061; nret)<br \/>\n        {<br \/>\n            perror(&#034;fail to recv&#034;);<br \/>\n            return -1;<br \/>\n        }<br \/>\n        else if (0 &#061;&#061; nret)<br \/>\n        {<br \/>\n            break;<br \/>\n        }<br \/>\n        printf(&#034;RECV:%s\\\\n&#034;, tmpbuff);<br \/>\n        sleep(1);<br \/>\n    }<br \/>\n    close(sockfd);<br \/>\n    return 0;<br \/>\n}<\/p>\n<p>\/\/server.c<br \/>\n#include &#034;head.h&#034;<br \/>\n#define SER_ADDR    &#034;192.168.0.138&#034;<br \/>\n#define SER_PORT    50000<br \/>\nint CreateListenSocket(char *pIp, int Port)<br \/>\n{<br \/>\n    int sockfd &#061; 0;<br \/>\n    int ret &#061; 0;<br \/>\n    struct sockaddr_in seraddr;<br \/>\n    sockfd &#061; socket(AF_INET, SOCK_STREAM, 0);<br \/>\n    if (-1 &#061;&#061; sockfd)<br \/>\n    {<br \/>\n        perror(&#034;fail to socket&#034;);<br \/>\n        return -1;<br \/>\n    }<br \/>\n    seraddr.sin_family &#061; AF_INET;<br \/>\n    seraddr.sin_port &#061; htons(Port);<br \/>\n    seraddr.sin_addr.s_addr &#061; inet_addr(pIp);<br \/>\n    ret &#061; bind(sockfd, (struct sockaddr *)&amp;seraddr, sizeof(seraddr));<br \/>\n    if (-1 &#061;&#061; ret)<br \/>\n    {<br \/>\n        perror(&#034;fail to bind&#034;);<br \/>\n        return -1;<br \/>\n    }<br \/>\n    ret &#061; listen(sockfd, 10);<br \/>\n    if (-1 &#061;&#061; ret)<br \/>\n    {<br \/>\n        perror(&#034;fail to listen&#034;);<br \/>\n        return -1;<br \/>\n    }<br \/>\n    return sockfd;<br \/>\n}<br \/>\nint handerclientfun(int confd)<br \/>\n{<br \/>\n    char tmpbuff[4096] &#061; {0};<br \/>\n    ssize_t nret &#061; 0;<br \/>\n    memset(tmpbuff, 0, sizeof(tmpbuff));<br \/>\n    nret &#061; recv(confd, tmpbuff, sizeof(tmpbuff), 0);<br \/>\n    if (-1 &#061;&#061; nret)<br \/>\n    {<br \/>\n        perror(&#034;fail to recv&#034;);<br \/>\n        return -1;<br \/>\n    }<br \/>\n    else if (0 &#061;&#061; nret)<br \/>\n    {<br \/>\n        return 0;<br \/>\n    }<br \/>\n    printf(&#034;RECV:%s\\\\n&#034;, tmpbuff);<\/p>\n<p>    sprintf(tmpbuff, &#034;%s &#8212; echo&#034;, tmpbuff);<br \/>\n    nret &#061; send(confd, tmpbuff, strlen(tmpbuff), 0);<br \/>\n    if (-1 &#061;&#061; nret)<br \/>\n    {<br \/>\n        perror(&#034;fail to send&#034;);<br \/>\n        return -1;<br \/>\n    }<\/p>\n<p>    return 0;<br \/>\n}<br \/>\nint main(void)<br \/>\n{<br \/>\n    int sockfd &#061; 0;<br \/>\n    int confd &#061; 0;<br \/>\n    pthread_t tid;<br \/>\n    fd_set rdfds;<br \/>\n    fd_set tmpfds;<br \/>\n    int maxfd &#061; 0;<br \/>\n    int nready &#061; 0;<br \/>\n    int i &#061; 0;<br \/>\n    int ret &#061; 0;<br \/>\n    sockfd &#061; CreateListenSocket(SER_ADDR, SER_PORT);<br \/>\n    FD_ZERO(&amp;rdfds);<br \/>\n    FD_SET(sockfd, &amp;rdfds);<br \/>\n    maxfd &#061; sockfd;<br \/>\n    while (1)<br \/>\n    {<br \/>\n        tmpfds &#061; rdfds;<br \/>\n        nready &#061; select(maxfd&#043;1, &amp;tmpfds, NULL, NULL, NULL);<br \/>\n        if (-1 &#061;&#061; nready)<br \/>\n        {<br \/>\n            perror(&#034;fail to select&#034;);<br \/>\n            return -1;<br \/>\n        }<br \/>\n        if (FD_ISSET(sockfd, &amp;tmpfds))<br \/>\n        {<br \/>\n            confd &#061; accept(sockfd, NULL, NULL);<br \/>\n            if (-1 &#061;&#061; confd)<br \/>\n            {<br \/>\n                perror(&#034;fail to accept&#034;);<br \/>\n                FD_CLR(sockfd, &amp;rdfds);<br \/>\n                close(sockfd);<br \/>\n                return -1;<br \/>\n            }<br \/>\n            FD_SET(confd, &amp;rdfds);<br \/>\n            maxfd &#061; confd &gt; maxfd ? confd : maxfd;<br \/>\n        }<br \/>\n        for (i &#061; 4; i &lt;&#061; maxfd;i&#043;&#043;)<br \/>\n        {<br \/>\n            if (FD_ISSET(i, &amp;tmpfds))<br \/>\n            {<br \/>\n                ret &#061; handerclientfun(i);<br \/>\n                if (-1 &#061;&#061; ret)<br \/>\n                {<br \/>\n                    FD_CLR(i, &amp;rdfds);<br \/>\n                    close(i);<br \/>\n                    continue;<br \/>\n                }<br \/>\n            }<br \/>\n        }<br \/>\n    }<br \/>\n    return 0;<br \/>\n}<\/p>\n<h4>2.4.2 epoll<\/h4>\n<p>\u2460 \u5b9e\u73b0\u65b9\u6cd5&#xff1a;<\/p>\n<ul>\n<li>\u521b\u5efa\u5957\u63a5\u5b57\u5e76\u76d1\u542c&#xff1a; \u4f7f\u7528 socket\u3001bind\u3001listen \u521b\u5efa\u5e76\u542f\u52a8\u4e00\u4e2a\u76d1\u542c\u5957\u63a5\u5b57\u3002<\/li>\n<li>\u521b\u5efa epoll \u5b9e\u4f8b&#xff1a; \u4f7f\u7528 epoll_create \u521b\u5efa\u4e00\u4e2a epoll \u5b9e\u4f8b\u3002<\/li>\n<li>\u6ce8\u518c\u76d1\u542c\u5957\u63a5\u5b57\u5230 epoll&#xff1a; \u4f7f\u7528 epoll_ctl \u5c06\u76d1\u542c\u5957\u63a5\u5b57\u6dfb\u52a0\u5230 epoll \u5b9e\u4f8b\u4e2d\u3002<\/li>\n<li>\u7b49\u5f85\u4e8b\u4ef6&#xff1a; \u4f7f\u7528 epoll_wait \u7b49\u5f85\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e0a\u7684\u4e8b\u4ef6\u3002<\/li>\n<li>\u5904\u7406\u4e8b\u4ef6&#xff1a; \u6839\u636e\u89e6\u53d1\u7684\u4e8b\u4ef6\u7c7b\u578b&#xff08;\u65b0\u7684\u8fde\u63a5\u6216\u73b0\u6709\u8fde\u63a5\u4e0a\u7684\u6570\u636e&#xff09;\u8fdb\u884c\u76f8\u5e94\u5904\u7406\u3002<\/li>\n<\/ul>\n<p>\u2461 epoll \u7684\u4f18\u70b9\u5982\u4e0b&#xff1a;<\/p>\n<ul>\n<li>\n<p>\u9ad8\u6548\u7684\u4e8b\u4ef6\u901a\u77e5\u673a\u5236&#xff1a;epoll \u662f Linux \u4e0b\u591a\u8def\u590d\u7528 I\/O \u63a5\u53e3 select\/poll \u7684\u589e\u5f3a\u7248\u672c\u3002\u5728\u5927\u91cf\u5e76\u53d1\u8fde\u63a5\u4f46\u4ec5\u6709\u5c11\u91cf\u6d3b\u8dc3\u7684\u573a\u666f\u4e0b&#xff0c;\u5b83\u80fd\u663e\u8457\u63d0\u5347\u7cfb\u7edf CPU \u5229\u7528\u7387\u3002\u4e00\u65b9\u9762&#xff0c;epoll \u4f1a\u590d\u7528\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408\u6765\u4f20\u9012\u7ed3\u679c&#xff0c;\u5f00\u53d1\u8005\u65e0\u9700\u5728\u6bcf\u6b21\u7b49\u5f85\u4e8b\u4ef6\u524d\u91cd\u65b0\u51c6\u5907\u5f85\u76d1\u542c\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408&#xff1b;\u53e6\u4e00\u65b9\u9762&#xff0c;\u83b7\u53d6\u4e8b\u4ef6\u65f6\u65e0\u9700\u904d\u5386\u6574\u4e2a\u88ab\u76d1\u542c\u7684\u63cf\u8ff0\u7b26\u96c6&#xff0c;\u53ea\u9700\u904d\u5386\u90a3\u4e9b\u88ab\u5185\u6838 I\/O \u4e8b\u4ef6\u5f02\u6b65\u5524\u9192\u5e76\u52a0\u5165\u5c31\u7eea\u961f\u5217\u7684\u63cf\u8ff0\u7b26\u5373\u53ef\u3002<\/p>\n<\/li>\n<li>\n<p>\u4e30\u5bcc\u7684\u89e6\u53d1\u6a21\u5f0f&#xff1a;epoll \u9664\u4e86\u63d0\u4f9b select\/poll \u652f\u6301\u7684\u7535\u5e73\u89e6\u53d1&#xff08;Level Triggered&#xff09;\u6a21\u5f0f\u5916&#xff0c;\u8fd8\u63d0\u4f9b\u4e86\u8fb9\u6cbf\u89e6\u53d1&#xff08;Edge Triggered&#xff09;\u6a21\u5f0f\u3002\u8fb9\u6cbf\u89e6\u53d1\u6a21\u5f0f\u5141\u8bb8\u7528\u6237\u7a7a\u95f4\u7a0b\u5e8f\u7f13\u5b58 I\/O \u72b6\u6001&#xff0c;\u51cf\u5c11\u00a0epoll_wait\u00a0\u7684\u8c03\u7528\u6b21\u6570&#xff0c;\u4ece\u800c\u8fdb\u4e00\u6b65\u63d0\u9ad8\u5e94\u7528\u7a0b\u5e8f\u6548\u7387\u3002<\/p>\n<\/li>\n<li>\n<p>\u9ad8\u6548\u7684\u6570\u636e\u7ed3\u6784&#xff1a;epoll \u5185\u90e8\u91c7\u7528\u7ea2\u9ed1\u6811&#xff08;\u4e00\u79cd\u81ea\u5e73\u8861\u4e8c\u53c9\u67e5\u627e\u6811&#xff09;\u6765\u7ba1\u7406\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408&#xff0c;\u67e5\u627e\u3001\u63d2\u5165\u548c\u5220\u9664\u64cd\u4f5c\u7684\u65f6\u95f4\u590d\u6742\u5ea6\u5747\u4e3a O(log n)&#xff0c;\u4fdd\u8bc1\u4e86\u5927\u89c4\u6a21\u6587\u4ef6\u63cf\u8ff0\u7b26\u7ba1\u7406\u7684\u9ad8\u6548\u6027\u3002<\/p>\n<\/li>\n<li>\n<p>\u5185\u6838\u6001\u7ef4\u62a4\u4e8b\u4ef6\u8868&#xff1a;<span style=\"color:#956fe7\">epoll \u5c06\u4e8b\u4ef6\u8868\u76f4\u63a5\u521b\u5efa\u5728\u5185\u6838\u7a7a\u95f4&#xff0c;\u907f\u514d\u4e86\u6bcf\u6b21\u7b49\u5f85\u4e8b\u4ef6\u65f6\u5728\u5e94\u7528\u5c42\u4e0e\u5185\u6838\u5c42\u4e4b\u95f4\u53cd\u590d\u62f7\u8d1d\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408\u7684\u5f00\u9500<\/span>\u3002<\/p>\n<\/li>\n<li>\n<p>\u7cbe\u786e\u7684\u4e8b\u4ef6\u8fd4\u56de&#xff1a;epoll_wait\u00a0\u76f4\u63a5\u8fd4\u56de\u5df2\u5c31\u7eea\u7684\u4e8b\u4ef6\u96c6\u5408&#xff0c;\u5e94\u7528\u7a0b\u5e8f\u65e0\u9700\u904d\u5386\u6574\u4e2a\u76d1\u542c\u96c6\u5408\u8fdb\u884c\u5224\u65ad&#xff0c;\u8fd4\u56de\u7684\u5373\u4e3a\u5df2\u89e6\u53d1\u7684\u4e8b\u4ef6&#xff0c;\u51cf\u5c11\u4e86\u65e0\u6548\u904d\u5386\u3002<\/p>\n<\/li>\n<li>\n<p>\u53cc\u6a21\u5f0f\u5de5\u4f5c\u80fd\u529b&#xff1a;epoll \u65e2\u53ef\u4ee5\u5de5\u4f5c\u5728\u7535\u5e73\u89e6\u53d1\u6a21\u5f0f&#xff0c;\u4e5f\u53ef\u4ee5\u5de5\u4f5c\u5728\u8fb9\u7f18\u89e6\u53d1\u6a21\u5f0f&#xff0c;\u4e3a\u4e0d\u540c\u573a\u666f\u63d0\u4f9b\u4e86\u7075\u6d3b\u7684\u9009\u62e9\u3002<\/p>\n<\/li>\n<\/ul>\n<p>\u2462\u00a0 \u51fd\u6570\u63a5\u53e3<\/p>\n<p>&#xff08;1&#xff09;epoll_create<\/p>\n<p>int epoll_create(int size);<br \/>\n\u529f\u80fd&#xff1a;\u521b\u5efa\u5185\u6838\u76d1\u542c\u4e8b\u4ef6\u8868<br \/>\n\u53c2\u6570&#xff1a;size:\u4e8b\u4ef6\u8868\u4e2d\u4e8b\u4ef6\u4e2a\u6570&#xff08;\u5ffd\u7565&#xff09;<br \/>\n\u8fd4\u56de\u503c&#xff1a;<br \/>\n    \u6210\u529f\u8fd4\u56de\u6587\u4ef6\u63cf\u8ff0\u7b26<br \/>\n    \u5931\u8d25\u8fd4\u56de-1<\/p>\n<p>&#xff08;2&#xff09;epoll_ctl<\/p>\n<p>int epoll_ctl(int epfd, int op, int fd, struct epoll_event *event);<br \/>\n\u529f\u80fd&#xff1a;\u64cd\u4f5cepoll\u7684\u4e8b\u4ef6\u8868<br \/>\n\u53c2\u6570&#xff1a;<br \/>\n    epfd:epoll\u4e8b\u4ef6\u8868\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26<br \/>\n    op:\u64cd\u4f5c\u7684\u65b9\u6cd5<br \/>\n        EPOLL_CTL_ADD \u5411\u4e8b\u4ef6\u8868\u4e2d\u6dfb\u52a0\u4e8b\u4ef6<br \/>\n        EPOLL_CTL_MOD \u4fee\u6539\u4e8b\u4ef6\u8868\u4e2d\u7684\u4e8b\u4ef6<br \/>\n        EPOLL_CTL_DEL \u4ece\u4e8b\u4ef6\u8868\u4e2d\u5220\u9664\u4e8b\u4ef6<br \/>\n    fd:\u8981\u64cd\u4f5c\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26<br \/>\n    event:\u6587\u4ef6\u63cf\u8ff0\u7b26\u5173\u8054\u7684\u4e8b\u4ef6<br \/>\n\u8fd4\u56de\u503c&#xff1a;<br \/>\n    \u6210\u529f\u8fd4\u56de0<br \/>\n    \u5931\u8d25\u8fd4\u56de-1<br \/>\ntypedef union epoll_data {<br \/>\n    void *ptr;<br \/>\n    int fd;<br \/>\n    uint32_t u32;<br \/>\n    uint64_t u64;<br \/>\n}epoll_data_t;<br \/>\nstruct epoll_event {<br \/>\n    uint32_t events; \/* Epoll events *\/<br \/>\n    epoll_data_t data; \/* User data variable *\/<br \/>\n};<br \/>\nEPOLL_IN:\u662f\u5426\u53ef\u4ee5\u8fdb\u884c\u8bfb\u64cd\u4f5c<br \/>\nEPOLL_OUT&#xff1a; \u662f\u5426\u53ef\u4ee5\u8fdb\u884c\u5199\u64cd\u4f5c<br \/>\nEPOLLET:\u8bbe\u7f6e\u4e3a\u8fb9\u6cbf\u89e6\u53d1\u6a21\u5f0f&#xff08;\u9ed8\u8ba4\u4e3a\u6c34\u5e73\u89e6\u53d1&#xff09;<\/p>\n<p>&#xff08;3&#xff09;epoll_wait<\/p>\n<p>int epoll_wait(int epfd, struct epoll_event *events, int maxevents, int timeout);<br \/>\n\u529f\u80fd&#xff1a;\u76d1\u542c\u4e8b\u4ef6\u8868\u4e2d\u7684\u4e8b\u4ef6\u662f\u5426\u53d1\u751f\u5e76\u7b49\u5f85\u8fd4\u56de\u76d1\u6d4b\u5230\u7684\u4e8b\u4ef6\u7ed3\u679c<br \/>\n\u53c2\u6570&#xff1a;<br \/>\n    epfd:\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408<br \/>\n    events:\u5b58\u653e\u4ea7\u751f\u4e8b\u4ef6\u7684\u6570\u7ec4\u7684\u7a7a\u95f4\u9996\u5730\u5740<br \/>\n    maxevents:\u5b58\u653e\u4ea7\u751f\u4e8b\u4ef6\u7684\u6570\u7ec4\u7684\u5927\u5c0f&#xff0c;\u76d1\u6d4b\u7684\u4e8b\u4ef6\u6700\u5927\u4e2a\u6570<br \/>\n    timeout:\u8d85\u65f6\u65f6\u95f4<br \/>\n        -1&#xff1a;\u963b\u585e\u76f4\u5230\u4e8b\u4ef6\u53d1\u751f<br \/>\n\u8fd4\u56de\u503c&#xff1a;<br \/>\n    \u6210\u529f\u8fd4\u56de\u53d1\u751f\u4e8b\u4ef6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e2a\u6570<br \/>\n    \u5931\u8d25\u8fd4\u56de-1<br \/>\n    \u65f6\u95f4\u5230\u8fbe\u6ca1\u6709\u4ea7\u751f\u4e8b\u4ef6\u8fd4\u56de0<\/p>\n<p>\u7ec3\u4e601&#xff1a;\u4f7f\u7528\u7ba1\u9053\u5b9e\u73b0epoll<\/p>\n<p>#include &#034;head.h&#034;<br \/>\nint main(void)<br \/>\n{<br \/>\n    int epfd &#061; 0;<br \/>\n    int fd &#061; 0;<br \/>\n    int ret &#061; 0;<br \/>\n    int nready &#061; 0;<br \/>\n    int i &#061; 0;<br \/>\n    char tmpbuff[4096] &#061; {0};<br \/>\n    struct epoll_event event;<br \/>\n    struct epoll_event revents[2];<br \/>\n    mkfifo(&#034;\/tmp\/myfifo&#034;, 0664);<br \/>\n    fd &#061; open(&#034;\/tmp\/myfifo&#034;, O_RDONLY);<br \/>\n    if (-1 &#061;&#061; fd)<br \/>\n    {<br \/>\n        perror(&#034;fail to open&#034;);<br \/>\n        return -1;<br \/>\n    }<br \/>\n    epfd &#061; epoll_create(2);<br \/>\n    if (-1 &#061;&#061; epfd)<br \/>\n    {<br \/>\n        perror(&#034;fail to epoll_create&#034;);<br \/>\n        return -1;<br \/>\n    }<br \/>\n    event.events &#061; EPOLLIN;<br \/>\n    event.data.fd &#061; fd;<br \/>\n    ret &#061; epoll_ctl(epfd, EPOLL_CTL_ADD, fd, &amp;event);<br \/>\n    if (-1 &#061;&#061; ret)<br \/>\n    {<br \/>\n        perror(&#034;fail to epoll_ctl&#034;);<br \/>\n        return -1;<br \/>\n    }<br \/>\n    event.events &#061; EPOLLIN;<br \/>\n    event.data.fd &#061; 0;<br \/>\n    ret &#061; epoll_ctl(epfd, EPOLL_CTL_ADD, 0, &amp;event);<br \/>\n    if (-1 &#061;&#061; ret)<br \/>\n    {<br \/>\n        perror(&#034;fail to epoll_ctl&#034;);<br \/>\n        return -1;<br \/>\n    }<br \/>\n    while (1)<br \/>\n    {<br \/>\n        nready &#061; epoll_wait(epfd, revents, 2, -1);<br \/>\n        if (-1 &#061;&#061; nready)<br \/>\n        {<br \/>\n            perror(&#034;fail to epoll_wait&#034;);<br \/>\n            return -1;<br \/>\n        }<br \/>\n        for (i &#061; 0; i &lt; nready; i&#043;&#043;)<br \/>\n        {<br \/>\n            if (revents[i].data.fd &#061;&#061; fd)<br \/>\n            {<br \/>\n                memset(tmpbuff, 0, sizeof(tmpbuff));<br \/>\n                read(fd, tmpbuff, sizeof(tmpbuff));<br \/>\n                printf(&#034;FIFO:%s\\\\n&#034;, tmpbuff);<br \/>\n            }<br \/>\n            else if (revents[i].data.fd &#061;&#061; 0)<br \/>\n            {<br \/>\n                memset(tmpbuff, 0, sizeof(tmpbuff));<br \/>\n                gets(tmpbuff);<br \/>\n                printf(&#034;STDIN:%s\\\\n&#034;, tmpbuff);<br \/>\n            }<br \/>\n        }<br \/>\n    }<br \/>\n    close(fd);<br \/>\n    return 0;<br \/>\n}<\/p>\n<p>\u7ec3\u4e602&#xff1a;\u901a\u8fc7epoll\u5b9e\u73b0TCP\u5e76\u53d1\u670d\u52a1\u5668\u6a21\u578b&#xff0c;\u5141\u8bb8\u591a\u4e2a\u5ba2\u6237\u7aef\u540c\u65f6\u8bbf\u95ee\u670d\u52a1\u5668<\/p>\n<p>\/\/server.c  client.c\u540c\u4e0a<br \/>\n#include &#034;head.h&#034;<br \/>\n#define SER_ADDR    &#034;192.168.0.138&#034;<br \/>\n#define SER_PORT    50000<br \/>\nint CreateListenSocket(char *pIp, int Port)<br \/>\n{<br \/>\n    int sockfd &#061; 0;<br \/>\n    int ret &#061; 0;<br \/>\n    struct sockaddr_in seraddr;<br \/>\n    sockfd &#061; socket(AF_INET, SOCK_STREAM, 0);<br \/>\n    if (-1 &#061;&#061; sockfd)<br \/>\n    {<br \/>\n        perror(&#034;fail to socket&#034;);<br \/>\n        return -1;<br \/>\n    }<br \/>\n    seraddr.sin_family &#061; AF_INET;<br \/>\n    seraddr.sin_port &#061; htons(Port);<br \/>\n    seraddr.sin_addr.s_addr &#061; inet_addr(pIp);<br \/>\n    ret &#061; bind(sockfd, (struct sockaddr *)&amp;seraddr, sizeof(seraddr));<br \/>\n    if (-1 &#061;&#061; ret)<br \/>\n    {<br \/>\n        perror(&#034;fail to bind&#034;);<br \/>\n        return -1;<br \/>\n    }<br \/>\n    ret &#061; listen(sockfd, 10);<br \/>\n    if (-1 &#061;&#061; ret)<br \/>\n    {<br \/>\n        perror(&#034;fail to listen&#034;);<br \/>\n        return -1;<br \/>\n    }<br \/>\n    return sockfd;<br \/>\n}<br \/>\nint handerclientfun(int confd)<br \/>\n{<br \/>\n    char tmpbuff[4096] &#061; {0};<br \/>\n    ssize_t nret &#061; 0;<br \/>\n    memset(tmpbuff, 0, sizeof(tmpbuff));<br \/>\n    nret &#061; recv(confd, tmpbuff, sizeof(tmpbuff), 0);<br \/>\n    if (-1 &#061;&#061; nret)<br \/>\n    {<br \/>\n        perror(&#034;fail to recv&#034;);<br \/>\n        return -1;<br \/>\n    }<br \/>\n    else if (0 &#061;&#061; nret)<br \/>\n    {<br \/>\n        return 0;<br \/>\n    }<br \/>\n    printf(&#034;RECV:%s\\\\n&#034;, tmpbuff);<br \/>\n    sprintf(tmpbuff, &#034;%s &#8212; echo&#034;, tmpbuff);<br \/>\n    nret &#061; send(confd, tmpbuff, strlen(tmpbuff), 0);<br \/>\n    if (-1 &#061;&#061; nret)<br \/>\n    {<br \/>\n        perror(&#034;fail to send&#034;);<br \/>\n        return -1;<br \/>\n    }<br \/>\n    return 0;<br \/>\n}<br \/>\nint AddEvent(int epfd, int fd)<br \/>\n{<br \/>\n    struct epoll_event env;<br \/>\n    int ret &#061; 0;<br \/>\n    env.events &#061; EPOLLIN;<br \/>\n    env.data.fd &#061; fd;<br \/>\n    ret &#061; epoll_ctl(epfd, EPOLL_CTL_ADD, fd, &amp;env);<br \/>\n    if (-1 &#061;&#061; ret)<br \/>\n    {<br \/>\n        perror(&#034;fail to epoll_ctl&#034;);<br \/>\n        return -1;<br \/>\n    }<br \/>\n    return 0;<br \/>\n}<br \/>\nint DelEvent(int epfd, int fd)<br \/>\n{<br \/>\n    int ret &#061; 0;<br \/>\n    ret &#061; epoll_ctl(epfd, EPOLL_CTL_DEL, fd, NULL);<br \/>\n    if (-1 &#061;&#061; ret)<br \/>\n    {<br \/>\n        perror(&#034;fail to epoll_ctl&#034;);<br \/>\n        return -1;<br \/>\n    }<br \/>\n    return 0;<br \/>\n}<br \/>\nint main(void)<br \/>\n{<br \/>\n    int sockfd &#061; 0;<br \/>\n    int confd &#061; 0;<br \/>\n    int nready &#061; 0;<br \/>\n    int i &#061; 0;<br \/>\n    int ret &#061; 0;<br \/>\n    int epfd &#061; 0;<br \/>\n    struct epoll_event retenv[4096];<br \/>\n    sockfd &#061; CreateListenSocket(SER_ADDR, SER_PORT);<br \/>\n    epfd &#061; epoll_create(4096);<br \/>\n    if (-1 &#061;&#061; epfd)<br \/>\n    {<br \/>\n        perror(&#034;fail to epoll_create&#034;);<br \/>\n        return -1;<br \/>\n    }<br \/>\n    AddEvent(epfd, sockfd);<br \/>\n    while (1)<br \/>\n    {<br \/>\n        nready &#061; epoll_wait(epfd, retenv, 4096, -1);<br \/>\n        if (-1 &#061;&#061; nready)<br \/>\n        {<br \/>\n            perror(&#034;fail to epoll_wait&#034;);<br \/>\n            return -1;<br \/>\n        }<br \/>\n        for (i &#061; 0; i &lt; nready; i&#043;&#043;)<br \/>\n        {<br \/>\n            if (sockfd &#061;&#061; retenv[i].data.fd)<br \/>\n            {<br \/>\n                confd &#061; accept(sockfd, NULL, NULL);<br \/>\n                if (-1 &#061;&#061; confd)<br \/>\n                {<br \/>\n                    perror(&#034;fail to accept&#034;);<br \/>\n                    DelEvent(epfd, sockfd);<br \/>\n                    close(sockfd);<br \/>\n                    continue;<br \/>\n                }<br \/>\n                AddEvent(epfd, confd);<br \/>\n            }<br \/>\n            else<br \/>\n            {<br \/>\n                ret &#061; handerclientfun(retenv[i].data.fd);<br \/>\n                if (-1 &#061;&#061; ret)<br \/>\n                {<br \/>\n                    DelEvent(epfd, retenv[i].data.fd);<br \/>\n                    close(retenv[i].data.fd);<br \/>\n                    continue;<br \/>\n                }<br \/>\n            }<br \/>\n        }<br \/>\n    }<br \/>\n    return 0;<br \/>\n}<\/p>\n<h4>2.4.3\u00a0select\u548cepoll\u7684\u533a\u522b<\/h4>\n<p>\u2460 <span style=\"color:#fe2c24\">select\u7279\u70b9&#xff1a;<\/span><\/p>\n<ul>\n<li>select\u76d1\u542c\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408\u672c\u8d28\u662f\u4e00\u4e2a\u6570\u7ec4&#xff08;\u4f4d\u56fe&#xff09;&#xff0c;\u6709\u4e0a\u9650\u9650\u5236&#xff0c;\u6700\u591a\u5141\u8bb8\u76d1\u6d4b1024\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff1b;<\/li>\n<li>select\u76d1\u542c\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408\u5728\u5e94\u7528\u5c42&#xff0c;\u5f53\u6709\u4e8b\u4ef6\u53d1\u751f\u65f6&#xff0c;\u9700\u8981\u7531\u5185\u6838\u5c42\u5411\u5e94\u7528\u5c42\u53d1\u9001\u901a\u77e5&#xff0c;\u53cd\u590d\u6570\u636e\u62f7\u8d1d&#xff0c;\u8d44\u6e90\u5f00\u9500\u5927&#xff1b;<\/li>\n<li>select\u53ea\u80fd\u5de5\u4f5c\u5728\u6c34\u5e73\u89e6\u53d1\u6a21\u5f0f&#xff08;\u4f4e\u901f\u6a21\u5f0f&#xff09;&#xff1b;<\/li>\n<li>select\u9700\u8981\u7528\u6237\u624b\u52a8\u67e5\u627e\u4ea7\u751f\u4e8b\u4ef6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff1b;<\/li>\n<\/ul>\n<p>\u2461\u00a0poll\u662f\u4f7f\u7528\u94fe\u8868\u4fdd\u5b58\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408&#xff0c;\u7406\u8bba\u4e0a\u6ca1\u6709\u6587\u4ef6\u63cf\u8ff0\u7b26\u9650\u5236&#xff1b;\u5176\u4ed6\u7279\u70b9\u548cselect\u4e00\u6837\u3002<\/p>\n<p>\u2462<span style=\"color:#fe2c24\">\u00a0epoll\u7279\u70b9&#xff1a;<\/span><\/p>\n<ul>\n<li>epoll\u76d1\u542c\u7684\u4e8b\u4ef6\u8868\u6ca1\u6709\u4e0a\u9650\u9650\u5236&#xff1b;<\/li>\n<li>epoll\u76d1\u542c\u7684\u4e8b\u4ef6\u8868\u5728\u5185\u6838\u4e2d&#xff0c;\u5185\u6838\u53ef\u4ee5\u76d1\u542c\u4e8b\u4ef6\u8868\u4e2d\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408\u662f\u5426\u6709\u4e8b\u4ef6\u53d1\u751f&#xff0c;\u6240\u4ee5\u65e0\u9700\u5b8c\u6210\u7528\u6237\u5c42\u548c\u5185\u6838\u5c42\u7a7a\u95f4\u7684\u62f7\u8d1d&#xff0c;\u51cf\u5c0f\u8d44\u6e90\u5f00\u9500&#xff1b;<\/li>\n<li>epoll\u53ef\u4ee5\u5de5\u4f5c\u5728\u6c34\u5e73\u89e6\u53d1&#xff08;\u4f4e\u901f\u6a21\u5f0f&#xff0c;\u9ed8\u8ba4\u6a21\u5f0f&#xff09;\u548c\u8fb9\u6cbf\u89e6\u53d1\u6a21\u5f0f&#xff08;\u9ad8\u901f\u6a21\u5f0f&#xff09;&#xff1b;<\/li>\n<li>epoll\u53ef\u4ee5\u81ea\u52a8\u83b7\u5f97\u4ea7\u751f\u4e8b\u4ef6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff1b;<\/li>\n<li>epoll \u5728\u5185\u6838\u4e2d\u4f7f\u7528\u7ea2\u9ed1\u6811&#xff08;\u4e00\u79cd\u81ea\u5e73\u8861\u4e8c\u53c9\u641c\u7d22\u6811&#xff0c;\u5c5e\u4e8e\u6811\u5f62\u7ed3\u6784&#xff09;\u6765\u5b58\u50a8\u548c\u7ba1\u7406\u6240\u6709\u5df2\u6ce8\u518c\u7684\u88ab\u76d1\u63a7\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff08;fd&#xff09;\u96c6\u5408\u3002<\/li>\n<li>\u5b8c\u6574\u7684 epoll \u5185\u6838\u5b9e\u73b0\u5305\u542b\u4e24\u4e2a\u6838\u5fc3\u6570\u636e\u7ed3\u6784&#xff1a;<\/li>\n<li>\n<table>\n<tr>\u6570\u636e\u7ed3\u6784\u7c7b\u578b\u4f5c\u7528\u65f6\u95f4\u590d\u6742\u5ea6<\/tr>\n<tbody>\n<tr>\n<td>\u7ea2\u9ed1\u6811&#xff08;rbr&#xff09;<\/td>\n<td>\u6811\u5f62\u7ed3\u6784<\/td>\n<td>\u5b58\u50a8\u6240\u6709\u88ab\u76d1\u63a7\u7684 fd \u53ca\u5176\u4e8b\u4ef6\u914d\u7f6e&#xff08;\u76d1\u63a7\u5168\u96c6&#xff09;<\/td>\n<td>\u589e\u5220\u67e5 O(log n)<\/td>\n<\/tr>\n<tr>\n<td>\u5c31\u7eea\u94fe\u8868&#xff08;rdllist&#xff09;<\/td>\n<td>\u53cc\u5411\u94fe\u8868<\/td>\n<td>\u5b58\u50a8\u5f53\u524d\u5df2\u89e6\u53d1\u4e8b\u4ef6\u7684\u5c31\u7eea fd&#xff08;\u7ed3\u679c\u96c6&#xff09;<\/td>\n<td>\u63d2\u5165\/\u8bfb\u53d6 O(1)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/li>\n<\/ul>\n<h4>2.4.4\u00a0IO\u591a\u8def\u590d\u7528\u7684\u5e94\u7528\u573a\u666f<\/h4>\n<p class=\"img-center\"><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"720\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/09\/20260907020908-6a9e1cc4a397d.png\" width=\"1819\" \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e00. \u5e76\u53d1\u670d\u52a1\u5668\u4ecb\u7ecd\u2460 \u5355\u5faa\u73af\u670d\u52a1\u5668&#xff1a;\u4e00\u6b21\u53ea\u80fd\u5904\u7406\u4e00\u4e2a\u5ba2\u6237\u7aef\u4efb\u52a1\u7684\u670d\u52a1\u5668\u3002<br \/>\n\u2461 \u5e76\u53d1\u670d\u52a1\u5668&#xff1a;\u80fd\u591f\u540c\u65f6\u5904\u7406\u591a\u4e2a\u5ba2\u6237\u7aef\u4efb\u52a1\u7684\u670d\u52a1\u5668\u3002\u2462\u00a0TCP\u5e76\u53d1\u670d\u52a1\u7aef&#xff1a;\u591a\u8fdb\u7a0b&#xff1a;\u5b89\u5168\u3001\u8d44\u6e90\u5f00\u9500\u5927\u3001\u5e76\u53d1\u91cf\u5c0f\u591a\u7ebf\u7a0b&#xff1a;\u76f8\u5bf9\u8fdb\u7a0b\u8d44\u6e90\u5f00\u9500\u5c0f&#xff0c;\u76f8\u5bf9\u5e76\u53d1\u91cf\u5927&#xff0c;\u7cfb\u7edf\u6709\u5d29\u6e83\u7684\u98ce\u9669\u7ebf\u7a0b\u6c60&#xff1a;\u63d0\u524d\u521b\u5efa\u597d\u5927\u91cf\u7ebf\u7a0b\u7ba1\u7406\u8d77\u6765&#xff0c;\u907f\u514d\u53cd\u590d\u521b\u5efa\u7ebf\u7a0b\u5e26\u6765\u65f6\u95f4\u6d88\u8017&#xff08;\u8bbe\u8ba1\u6a21\u5f0f&#xff1a;\u751f\u4ea7\u8005-<\/p>\n","protected":false},"author":2,"featured_media":101710,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[58,5063,103,43,44],"topic":[],"class_list":["post-101711","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-linux","tag-ubuntu","tag-43","tag-44"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Linux\u7f51\u7edc\u7f16\u7a0b04-TCP\u5e76\u53d1\u670d\u52a1\u5668 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/101711.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Linux\u7f51\u7edc\u7f16\u7a0b04-TCP\u5e76\u53d1\u670d\u52a1\u5668 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"\u4e00. \u5e76\u53d1\u670d\u52a1\u5668\u4ecb\u7ecd\u2460 \u5355\u5faa\u73af\u670d\u52a1\u5668&#xff1a;\u4e00\u6b21\u53ea\u80fd\u5904\u7406\u4e00\u4e2a\u5ba2\u6237\u7aef\u4efb\u52a1\u7684\u670d\u52a1\u5668\u3002 \u2461 \u5e76\u53d1\u670d\u52a1\u5668&#xff1a;\u80fd\u591f\u540c\u65f6\u5904\u7406\u591a\u4e2a\u5ba2\u6237\u7aef\u4efb\u52a1\u7684\u670d\u52a1\u5668\u3002\u2462\u00a0TCP\u5e76\u53d1\u670d\u52a1\u7aef&#xff1a;\u591a\u8fdb\u7a0b&#xff1a;\u5b89\u5168\u3001\u8d44\u6e90\u5f00\u9500\u5927\u3001\u5e76\u53d1\u91cf\u5c0f\u591a\u7ebf\u7a0b&#xff1a;\u76f8\u5bf9\u8fdb\u7a0b\u8d44\u6e90\u5f00\u9500\u5c0f&#xff0c;\u76f8\u5bf9\u5e76\u53d1\u91cf\u5927&#xff0c;\u7cfb\u7edf\u6709\u5d29\u6e83\u7684\u98ce\u9669\u7ebf\u7a0b\u6c60&#xff1a;\u63d0\u524d\u521b\u5efa\u597d\u5927\u91cf\u7ebf\u7a0b\u7ba1\u7406\u8d77\u6765&#xff0c;\u907f\u514d\u53cd\u590d\u521b\u5efa\u7ebf\u7a0b\u5e26\u6765\u65f6\u95f4\u6d88\u8017&#xff08;\u8bbe\u8ba1\u6a21\u5f0f&#xff1a;\u751f\u4ea7\u8005-\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.wsisp.com\/helps\/101711.html\" \/>\n<meta property=\"og:site_name\" content=\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"article:published_time\" 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