{"id":119199,"date":"2026-10-29T03:08:27","date_gmt":"2026-10-28T19:08:27","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/119199.html"},"modified":"2026-10-29T03:08:27","modified_gmt":"2026-10-28T19:08:27","slug":"linux-%e5%ad%a6%e4%b9%a0%e7%ac%94%e8%ae%b0%ef%bc%88%e5%9b%9b%e5%8d%81%ef%bc%89%ef%bc%9atcp-%e7%bc%96%e7%a8%8b-%e4%bb%8e%e7%90%86%e8%ae%ba%e5%88%b0-echoserver-%e5%ae%9e%e6%88%98","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/119199.html","title":{"rendered":"Linux \u5b66\u4e60\u7b14\u8bb0\uff08\u56db\u5341\uff09\uff1aTCP \u7f16\u7a0b\u2014\u2014\u4ece\u7406\u8bba\u5230 EchoServer \u5b9e\u6218"},"content":{"rendered":"

📌 \u6838\u5fc3\u7ed3\u8bba（TL;DR）：<\/h3>\n
  • \n

    TCP \u6838\u5fc3\u7279\u6027：\u9762\u5411\u8fde\u63a5（\u4e09\u6b21\u63e1\u624b）\u3001\u53ef\u9760\u4f20\u8f93\u3001\u9762\u5411\u5b57\u8282\u6d41\u3002<\/p>\n<\/li>\n

  • \n

    \u670d\u52a1\u7aef\u4e94\u6b65\u66f2：socket() -> bind() -> listen() -> accept() -> read()\/write()\u3002<\/p>\n<\/li>\n

  • \n

    \u6781\u5176\u91cd\u8981：accept() \u6210\u529f\u540e\u8fd4\u56de\u7684\u662f\u4e00\u4e2a\u5168\u65b0\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26 connfd，\u4e13\u95e8\u7528\u4e8e\u548c\u8be5\u5ba2\u6237\u7aef\u901a\u4fe1，\u539f\u6765\u7684 listenfd \u7ee7\u7eed\u76d1\u542c\u3002<\/p>\n<\/li>\n

  • \n

    \u65ad\u7ebf\u611f\u77e5：TCP \u4e2d read() \u8fd4\u56de 0，\u4ee3\u8868\u5bf9\u7aef（\u5ba2\u6237\u7aef）\u4e3b\u52a8\u5173\u95ed\u4e86\u8fde\u63a5，\u800c\u4e0d\u662f\u51fa\u9519\u3002<\/p>\n<\/li>\n

  • \n

    \u8e29\u5751\u9632\u8303：\u670d\u52a1\u7aef\u91cd\u542f\u5e38\u9047 Address already in use，\u9700\u7528 setsockopt() \u8bbe\u7f6e SO_REUSEADDR \u7aef\u53e3\u590d\u7528\u3002<\/p>\n<\/li>\n

    \u4e00\u3001 TCP \u6838\u5fc3\u6d41\u7a0b\u89e3\u6790<\/h3>\n

    TCP \u5c31\u50cf\u6253\u7535\u8bdd，\u5fc5\u987b\u5148\u5efa\u7acb\u8fde\u63a5\u3002<\/p>\n

      \n
    • \n

      \u670d\u52a1\u5668\u7aef：socket\u521b\u5efa\u7535\u8bdd\u673a，bind\u63d2\u5361\u7ed1\u5b9a\u56fa\u5b9a\u53f7\u7801，listen\u5f00\u673a\u5f85\u673a，accept\u63a5\u542c\u3002<\/p>\n<\/li>\n

    • \n

      \u5ba2\u6237\u7aef：socket\u521b\u5efa\u7535\u8bdd\u673a，connect\u76f4\u63a5\u62e8\u53f7\u3002
      \n(\u6ce8：\u5ba2\u6237\u7aef\u4e0d\u9700\u8981\u624b\u52a8 bind，connect \u65f6\u64cd\u4f5c\u7cfb\u7edf\u4f1a\u81ea\u52a8\u5206\u914d\u968f\u673a\u7aef\u53e3)<\/p>\n<\/li>\n<\/ul>\n

      \u4e8c\u3001 \u4e3a\u4ec0\u4e48 accept \u8981\u8fd4\u56de\u65b0\u7684\u5957\u63a5\u5b57？<\/h3>\n

      listen_fd \u662f\u8d1f\u8d23\u76d1\u542c\u662f\u5426\u6709\u65b0\u8fde\u63a5\u8fdb\u6765\u7684（\u53ea\u8d1f\u8d23\u62c9\u5ba2），\u800c accept \u8fd4\u56de\u7684 conn_fd \u624d\u662f\u771f\u6b63\u7528\u6765\u548c\u5f53\u524d\u5ba2\u6237\u7aef\u901a\u4fe1\u7684\u3002\u5982\u679c\u4e0d\u8fd9\u6837\u505a，\u670d\u52a1\u5668\u5c31\u65e0\u6cd5\u540c\u65f6\u4e3a\u591a\u4e2a\u5ba2\u6237\u7aef\u670d\u52a1\u3002<\/p>\n

      \u4e09\u3001 \u5b9e\u6218：\u5355\u8fdb\u7a0b TCP Echo \u670d\u52a1\u5668<\/h3>\n

      (\u8fd9\u91cc\u53ea\u5c55\u793a\u6838\u5fc3\u903b\u8f91，\u5b8c\u6574\u4ee3\u7801\u89c1\u6587\u672b)<\/p>\n

      \/\/ \u7aef\u53e3\u590d\u7528，\u89e3\u51b3\u91cd\u542f\u62a5\u9519\u95ee\u9898
      \nint opt = 1;
      \nsetsockopt(listen_fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));<\/p>\n

      \/\/ \u63a5\u6536\u8fde\u63a5
      \nint conn_fd = accept(listen_fd, (struct sockaddr*)&client_addr, &client_len);<\/p>\n

      \/\/ \u901a\u4fe1\u4e0e\u65ad\u7ebf\u5224\u65ad
      \nint n = read(conn_fd, buffer, BUF_SIZE);
      \nif (n > 0) {
      \n \/\/ \u6b63\u5e38\u6536\u5230\u6570\u636e
      \n write(conn_fd, buffer, n);
      \n} else if (n == 0) {
      \n \/\/ \u91cd\u70b9：n == 0 \u4ee3\u8868\u5ba2\u6237\u7aef\u5173\u95ed\u4e86\u8fde\u63a5 (\u6536\u5230\u4e86 FIN \u5305)
      \n printf("\u5ba2\u6237\u7aef\u5df2\u65ad\u5f00\u8fde\u63a5\u3002\\\\n");
      \n break;
      \n}<\/p>\n

      \u56db\u3001 \u8e29\u5751\u8bb0\u5f55：Address already in use<\/h3>\n
        \n
      • \n

        \u73b0\u8c61：\u5f3a\u5236 Ctrl+C \u7ed3\u675f\u670d\u52a1\u5668\u540e，\u7acb\u523b\u91cd\u65b0\u8fd0\u884c，\u62a5\u9519 bind error: Address already in use\u3002<\/p>\n<\/li>\n

      • \n

        \u539f\u56e0：TCP \u8fde\u63a5\u65ad\u5f00\u65f6，\u4e3b\u52a8\u65ad\u5f00\u65b9\u4f1a\u8fdb\u5165 TIME_WAIT \u72b6\u6001，\u5360\u7528\u7aef\u53e3\u4e00\u6bb5\u65f6\u95f4（\u901a\u5e38\u662f 2MSL，\u7ea6 1 \u5206\u949f），\u9632\u6b62\u6700\u540e\u4e00\u4e2a ACK \u4e22\u5931\u5bfc\u81f4\u8fde\u63a5\u6df7\u4e71\u3002<\/p>\n<\/li>\n

      • \n

        \u89e3\u51b3：\u5728 bind \u524d\u8c03\u7528 setsockopt \u8bbe\u7f6e SO_REUSEADDR，\u5141\u8bb8\u7aef\u53e3\u590d\u7528\u3002<\/p>\n<\/li>\n<\/ul>\n

        \u4e94\u3001 \u5c40\u9650\u6027<\/h3>\n

        \u5f53\u524d\u7684\u670d\u52a1\u5668\u662f\u5355\u8fdb\u7a0b\u3001\u5355\u7ebf\u7a0b\u7684\u3002\u4e00\u65e6 accept \u6210\u529f，\u670d\u52a1\u5668\u5c31\u9677\u5165\u4e86 while(read) \u7684\u963b\u585e\u3002\u6b64\u65f6，\u7b2c\u4e8c\u4e2a\u5ba2\u6237\u7aef\u8fde\u90fd\u8fde\u4e0d\u8fdb\u6765\u3002<\/p>\n

        \u81ea\u6211\u5b9e\u6218\u64cd\u4f5c<\/h3>\n

        cd ~\/linux_study\/network_test<\/p>\n

        \u670d\u52a1\u7aef tcp_server.c<\/h5>\n

        #include <stdio.h>
        \n#include <stdlib.h>
        \n#include <string.h>
        \n#include <unistd.h>
        \n#include <arpa\/inet.h><\/p>\n

        #define PORT 9999
        \n#define BUF_SIZE 1024<\/p>\n

        int main() {
        \n int listen_fd = socket(AF_INET, SOCK_STREAM, 0);<\/p>\n

        \/\/ \u7aef\u53e3\u590d\u7528，\u9632\u6b62\u91cd\u542f\u65f6 Address already in use
        \n int opt = 1;
        \n setsockopt(listen_fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));<\/p>\n

        struct sockaddr_in server_addr;
        \n memset(&server_addr, 0, sizeof(server_addr));
        \n server_addr.sin_family = AF_INET;
        \n server_addr.sin_port = htons(PORT);
        \n server_addr.sin_addr.s_addr = INADDR_ANY;<\/p>\n

        bind(listen_fd, (struct sockaddr*)&server_addr, sizeof(server_addr));
        \n listen(listen_fd, 5);
        \n printf("TCP \u670d\u52a1\u5668\u542f\u52a8，\u76d1\u542c\u7aef\u53e3 %d…\\\\n", PORT);<\/p>\n

        struct sockaddr_in client_addr;
        \n socklen_t len = sizeof(client_addr);<\/p>\n

        \/\/ \u6838\u5fc3：\u963b\u585e\u7b49\u5f85\u5ba2\u6237\u7aef\u8fde\u63a5
        \n int conn_fd = accept(listen_fd, (struct sockaddr*)&client_addr, &len);
        \n printf("\u63a5\u5230\u5ba2\u6237\u7aef %s:%d\\\\n", inet_ntoa(client_addr.sin_addr), ntohs(client_addr.sin_port));<\/p>\n

        char buffer[BUF_SIZE];
        \n while (1) {
        \n int n = read(conn_fd, buffer, BUF_SIZE – 1);
        \n if (n > 0) {
        \n buffer[n] = '\\\\0';
        \n printf("\u6536\u5230\u6d88\u606f: %s\\\\n", buffer);
        \n write(conn_fd, buffer, n); \/\/ Echo\u56de\u663e
        \n } else if (n == 0) {
        \n \/\/ \u6838\u5fc3：\u5ba2\u6237\u7aef\u65ad\u5f00
        \n printf("\u5ba2\u6237\u7aef\u65ad\u5f00\u4e86\u8fde\u63a5\u3002\\\\n");
        \n break;
        \n }
        \n }
        \n close(conn_fd);
        \n close(listen_fd);
        \n return 0;
        \n}<\/p>\n

        \u5ba2\u6237\u7aef tcp_client.c<\/h5>\n

        #include <stdio.h>
        \n#include <stdlib.h>
        \n#include <string.h>
        \n#include <unistd.h>
        \n#include <arpa\/inet.h><\/p>\n

        #define SERVER_IP "127.0.0.1"
        \n#define PORT 9999
        \n#define BUF_SIZE 1024<\/p>\n

        int main() {
        \n int sock_fd = socket(AF_INET, SOCK_STREAM, 0);
        \n struct sockaddr_in server_addr;
        \n memset(&server_addr, 0, sizeof(server_addr));
        \n server_addr.sin_family = AF_INET;
        \n server_addr.sin_port = htons(PORT);
        \n inet_pton(AF_INET, SERVER_IP, &server_addr.sin_addr);<\/p>\n

        if (connect(sock_fd, (struct sockaddr*)&server_addr, sizeof(server_addr)) < 0) {
        \n perror("connect"); return 1;
        \n }<\/p>\n

        char buffer[BUF_SIZE];
        \n while (1) {
        \n printf("\u8bf7\u8f93\u5165: ");
        \n fgets(buffer, BUF_SIZE, stdin);
        \n buffer[strcspn(buffer, "\\\\n")] = 0;
        \n if (strcmp(buffer, "quit") == 0) break;<\/p>\n

        write(sock_fd, buffer, strlen(buffer));
        \n int n = read(sock_fd, buffer, BUF_SIZE – 1);
        \n if (n > 0) {
        \n buffer[n] = '\\\\0';
        \n printf("\u56de\u663e: %s\\\\n", buffer);
        \n }
        \n }
        \n close(sock_fd);
        \n return 0;
        \n}<\/p>\n

        \"\"<\/p>\n

        \"\"<\/p>\n

        \u7f16\u8bd1\u8fd0\u884c：\u5f00\u4e24\u4e2a\u7ec8\u7aef，\u8dd1\u8d77\u670d\u52a1\u7aef\u548c\u5ba2\u6237\u7aef，\u53d1\u6d88\u606f\u6d4b\u8bd5\u3002\u6d4b\u8bd5\u5b8c\u5728\u5ba2\u6237\u7aef\u6309 Ctrl+C \u65ad\u5f00，\u770b\u770b\u670d\u52a1\u7aef\u662f\u4e0d\u662f\u6253\u5370\u4e86\u201c\u5ba2\u6237\u7aef\u65ad\u5f00\u201d\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

        📌 \u6838\u5fc3\u7ed3\u8bba（TL;DR）：TCP \u6838\u5fc3\u7279\u6027：\u9762\u5411\u8fde\u63a5（\u4e09\u6b21\u63e1\u624b）\u3001\u53ef\u9760\u4f20\u8f93\u3001\u9762\u5411\u5b57\u8282\u6d41\u3002\u670d\u52a1\u7aef\u4e94\u6b65\u66f2：socket() -> bind() -> listen() -> accept() -> read()\/write()\u3002\u6781\u5176\u91cd\u8981：accept() \u6210\u529f\u540e\u8fd4\u56de\u7684\u662f\u4e00\u4e2a\u5168\u65b0\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26 connfd，\u4e13\u95e8\u7528\u4e8e\u548c\u8be5\u5ba2\u6237\u7aef\u901a\u4fe1&#xff0<\/p>\n","protected":false},"author":2,"featured_media":119197,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[58,371,43,305,44],"topic":[],"class_list":["post-119199","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-linux","tag-371","tag-43","tag-305","tag-44"],"yoast_head":"\nLinux \u5b66\u4e60\u7b14\u8bb0\uff08\u56db\u5341\uff09\uff1aTCP \u7f16\u7a0b\u2014\u2014\u4ece\u7406\u8bba\u5230 EchoServer \u5b9e\u6218 - \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\/119199.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Linux \u5b66\u4e60\u7b14\u8bb0\uff08\u56db\u5341\uff09\uff1aTCP \u7f16\u7a0b\u2014\u2014\u4ece\u7406\u8bba\u5230 EchoServer \u5b9e\u6218 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"📌 \u6838\u5fc3\u7ed3\u8bba（TL;DR）：TCP \u6838\u5fc3\u7279\u6027：\u9762\u5411\u8fde\u63a5（\u4e09\u6b21\u63e1\u624b）\u3001\u53ef\u9760\u4f20\u8f93\u3001\u9762\u5411\u5b57\u8282\u6d41\u3002\u670d\u52a1\u7aef\u4e94\u6b65\u66f2：socket() -> bind() -> listen() -> accept() -> read()\/write()\u3002\u6781\u5176\u91cd\u8981：accept() \u6210\u529f\u540e\u8fd4\u56de\u7684\u662f\u4e00\u4e2a\u5168\u65b0\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26 connfd，\u4e13\u95e8\u7528\u4e8e\u548c\u8be5\u5ba2\u6237\u7aef\u901a\u4fe1&#xff0\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.wsisp.com\/helps\/119199.html\" \/>\n<meta property=\"og:site_name\" content=\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"article:published_time\" content=\"2026-10-28T19:08:27+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/10\/20261028190825-6ae2482975459.png\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/119199.html\",\"url\":\"https:\/\/www.wsisp.com\/helps\/119199.html\",\"name\":\"Linux \u5b66\u4e60\u7b14\u8bb0\uff08\u56db\u5341\uff09\uff1aTCP \u7f16\u7a0b\u2014\u2014\u4ece\u7406\u8bba\u5230 EchoServer \u5b9e\u6218 - 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