{"id":26210,"date":"2025-04-19T14:51:33","date_gmt":"2025-04-19T06:51:33","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/26210.html"},"modified":"2025-04-19T14:51:33","modified_gmt":"2025-04-19T06:51:33","slug":"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\/26210.html","title":{"rendered":"TCP\u5e76\u53d1\u670d\u52a1\u5668"},"content":{"rendered":"

\u7aef\u53e3\u53f7\u5feb\u901f\u590d\u7528\u51fd\u6570<\/h3>\n

\u901a\u8fc7getsockopt\u548csetsockopt\u51fd\u6570\uff0c\u7ba1\u7406\u5957\u63a5\u5b57\u7684\u7aef\u53e3\u53f7\u590d\u7528\u8bbe\u7f6e\u3002\u5177\u4f53\u64cd\u4f5c\u5982\u4e0b\uff1a<\/p>\n

getsockopt\u51fd\u6570<\/h4>\n

int getsockopt(int sockfd, int level, int optname, void *optval, socklen_t *optlen);<\/p>\n

\u529f\u80fd\uff1a\u83b7\u53d6\u5957\u63a5\u5b57\u7684\u67d0\u4e9b\u9009\u9879\u7684\u5c5e\u6027\u3002<\/p>\n

\u53c2\u6570\uff1a<\/p>\n

  • sockfd: \u5957\u63a5\u5b57\u63cf\u8ff0\u7b26\u3002<\/li>\n
  • level: \u83b7\u53d6\u7684\u5c42\u7ea7\uff08\u4f8b\u5982SOL_SOCKET\uff09\u3002<\/li>\n
  • optname: \u8981\u83b7\u53d6\u7684\u64cd\u4f5c\u540d\u79f0\uff08\u5982SO_REUSEADDR\uff09\u3002<\/li>\n
  • optval: \u83b7\u53d6\u7684\u503c\uff080\u8868\u793a\u7981\u7528\uff0c\u975e0\u8868\u793a\u542f\u7528\uff09\u3002<\/li>\n
  • optlen: \u53c2\u65704\u7684\u5927\u5c0f\u3002<\/li>\n

    \u8fd4\u56de\u503c\uff1a \u6210\u529f\u8fd4\u56de0\uff0c\u5931\u8d25\u8fd4\u56de-1\u3002<\/p>\n

    \n

    setsockopt\u51fd\u6570<\/h4>\n

    int setsockopt(int sockfd, int level, int optname, const void *optval, socklen_t optlen);<\/p>\n

    \u529f\u80fd\uff1a\u8bbe\u7f6e\u5957\u63a5\u5b57\u7684\u67d0\u4e9b\u9009\u9879\u7684\u5c5e\u6027\u3002<\/p>\n

    \u53c2\u6570\uff1a<\/p>\n

  • sockfd: \u5957\u63a5\u5b57\u63cf\u8ff0\u7b26\u3002<\/li>\n
  • level: \u8bbe\u7f6e\u7684\u5c42\u7ea7\uff08\u4f8b\u5982SOL_SOCKET\uff09\u3002<\/li>\n
  • optname: \u8981\u8bbe\u7f6e\u7684\u64cd\u4f5c\u540d\u79f0\uff08\u5982SO_REUSEADDR\uff09\u3002<\/li>\n
  • optval: \u8bbe\u7f6e\u7684\u503c\uff080\u8868\u793a\u7981\u7528\uff0c\u975e0\u8868\u793a\u542f\u7528\uff09\u3002<\/li>\n
  • optlen: \u53c2\u65704\u7684\u5927\u5c0f\u3002<\/li>\n

    \u8fd4\u56de\u503c\uff1a \u6210\u529f\u8fd4\u56de0\uff0c\u5931\u8d25\u8fd4\u56de-1\u3002<\/p>\n

    \n

    \u793a\u4f8b\u4ee3\u7801\uff1a\u7aef\u53e3\u53f7\u5feb\u901f\u590d\u7528<\/h4>\n

    \/\/ \u83b7\u53d6\u5f53\u524d\u7aef\u53e3\u53f7\u662f\u5426\u80fd\u5feb\u901f\u590d\u7528
    \nint n;
    \nint len = sizeof(n);
    \ngetsockopt(oldfd, SOL_SOCKET, SO_REUSEADDR, &n, &len);
    \nif (n == 0) {
    \n printf(\\”\u7aef\u53e3\u53f7\u5feb\u901f\u590d\u7528\u672a\u542f\u52a8\\\\n\\”);
    \n} else {
    \n printf(\\”\u7aef\u53e3\u53f7\u5feb\u901f\u590d\u7528\u5df2\u7ecf\u542f\u52a8\\\\n\\”);
    \n}<\/p>\n

    \/\/ \u8bbe\u7f6e\u5f53\u524d\u5957\u63a5\u5b57\u7aef\u53e3\u53f7\u5feb\u901f\u590d\u7528
    \nn = 999;
    \nsetsockopt(oldfd, SOL_SOCKET, SO_REUSEADDR, &n, sizeof(n));<\/p>\n

    \n

    \"\"<\/p>\n

    \n

    1. \u5faa\u73af\u670d\u52a1\u5668\u6a21\u578b<\/h3>\n

    \u63cf\u8ff0<\/h4>\n

    \u5faa\u73af\u670d\u52a1\u5668\u6a21\u578b\u662f\u4e00\u6b21\u53ea\u5904\u7406\u4e00\u4e2a\u5ba2\u6237\u7aef\u8bf7\u6c42\u7684\u4f20\u7edf\u65b9\u5f0f\uff0c\u5904\u7406\u5b8c\u4e00\u4e2a\u5ba2\u6237\u7aef\u8bf7\u6c42\u540e\uff0c\u624d\u4f1a\u7ee7\u7eed\u5904\u7406\u4e0b\u4e00\u4e2a\u5ba2\u6237\u7aef\u8bf7\u6c42\u3002\u7531\u4e8e\u5176\u6548\u7387\u8f83\u4f4e\uff0c\u6bcf\u6b21\u53ea\u80fd\u6267\u884c\u5355\u4e2a\u4efb\u52a1\uff0c\u56e0\u6b64\u5728\u9ad8\u5e76\u53d1\u573a\u666f\u4e0b\u8868\u73b0\u4e0d\u4f73\u3002<\/p>\n

    \u5728\u5faa\u73af\u670d\u52a1\u5668\u6a21\u578b\u4e2d\uff0c\u670d\u52a1\u5668\u7aef\u91c7\u7528\u4e86\u4e00\u4e2a\u5faa\u73af\u6765\u4e0d\u65ad\u63a5\u6536\u5ba2\u6237\u7aef\u8bf7\u6c42\u3002\u6bcf\u5f53\u4e00\u4e2a\u5ba2\u6237\u7aef\u8fde\u63a5\u6210\u529f\u540e\uff0c\u670d\u52a1\u5668\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u5957\u63a5\u5b57\u7528\u4e8e\u901a\u4fe1\uff0c\u5e76\u5904\u7406\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42\u3002\u6bcf\u5904\u7406\u5b8c\u4e00\u4e2a\u5ba2\u6237\u7aef\u8bf7\u6c42\u540e\uff0c\u670d\u52a1\u5668\u7ee7\u7eed\u7b49\u5f85\u4e0b\u4e00\u4e2a\u5ba2\u6237\u7aef\u7684\u8fde\u63a5\u3002<\/p>\n

    \u4e3b\u8981\u6b65\u9aa4\uff1a<\/h4>\n
  • \u521b\u5efa\u5957\u63a5\u5b57\uff1a\u4f7f\u7528 socket() \u51fd\u6570\u521b\u5efa\u5957\u63a5\u5b57\u3002<\/li>\n
  • \u7ed1\u5b9a\uff1a\u5c06\u5957\u63a5\u5b57\u4e0e\u670d\u52a1\u5668\u7684 IP \u5730\u5740\u548c\u7aef\u53e3\u53f7\u7ed1\u5b9a\u3002<\/li>\n
  • \u76d1\u542c\uff1a\u5f00\u59cb\u76d1\u542c\u5ba2\u6237\u7aef\u8fde\u63a5\u8bf7\u6c42\u3002<\/li>\n
  • \u5faa\u73af\u63a5\u6536\u5ba2\u6237\u7aef\u8bf7\u6c42\uff1a\n
      \n
    • \u6bcf\u6b21 accept() \u6210\u529f\u540e\uff0c\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u5957\u63a5\u5b57\u7528\u4e8e\u901a\u4fe1\u3002<\/li>\n
    • \u5faa\u73af\u6536\u53d1\u4fe1\u606f\uff0c\u76f4\u5230\u5ba2\u6237\u7aef\u65ad\u5f00\u8fde\u63a5\u3002<\/li>\n<\/ul>\n<\/li>\n
    • \u5173\u95ed\u8fde\u63a5\uff1a\u6bcf\u6b21\u5ba2\u6237\u7aef\u65ad\u5f00\u8fde\u63a5\u540e\uff0c\u5173\u95ed\u76f8\u5e94\u7684\u5957\u63a5\u5b57\u3002<\/li>\n
    • \n

      \u5173\u95ed\u76d1\u542c\u5957\u63a5\u5b57<\/p>\n<\/li>\n

      \u5faa\u73af\u670d\u52a1\u5668\u4ee3\u7801\u5b9e\u73b0<\/h4>\n

      \u4ee3\u7801\u793a\u4f8b<\/h5>\n

      #include <myhead.h>
      \n#define IP \\”192.168.60.45\\”
      \n#define PORT 6666
      \n#define BACKLOG 20<\/p>\n

      int main(int argc, const char *argv[]) {
      \n \/\/ 1. \u521b\u5efa\u5957\u63a5\u5b57
      \n int oldfd = socket(AF_INET, SOCK_STREAM, 0); \/\/ IPV4, TCP\u534f\u8bae
      \n if (oldfd == -1) {
      \n perror(\\”socket\\”);
      \n return -1;
      \n }<\/p>\n

      \/\/ 2. \u83b7\u53d6\u7aef\u53e3\u53f7\u5c5e\u6027\uff0c\u67e5\u770b\u662f\u5426\u542f\u7528\u7aef\u53e3\u53f7\u5feb\u901f\u590d\u7528
      \n int n;
      \n int len = sizeof(n);
      \n if (getsockopt(oldfd, SOL_SOCKET, SO_REUSEADDR, &n, &len) == -1) {
      \n perror(\\”getsockopt\\”);
      \n return -1;
      \n }
      \n if (n) {
      \n printf(\\”\u7aef\u53e3\u53f7\u5feb\u901f\u590d\u7528\u5df2\u7ecf\u542f\u52a8\\\\n\\”);
      \n } else {
      \n printf(\\”\u7aef\u53e3\u53f7\u5feb\u901f\u590d\u7528\u672a\u542f\u52a8\\\\n\\”);
      \n }<\/p>\n

      \/\/ \u8bbe\u7f6e\u7aef\u53e3\u53f7\u5feb\u901f\u590d\u7528
      \n n = 999;
      \n if (setsockopt(oldfd, SOL_SOCKET, SO_REUSEADDR, &n, sizeof(n)) == -1) {
      \n perror(\\”setsockopt\\”);
      \n return -1;
      \n }
      \n printf(\\”\u7aef\u53e3\u53f7\u5feb\u901f\u590d\u7528\u6210\u529f\\\\n\\”);<\/p>\n

      \/\/ 3. \u7ed1\u5b9aIP\u548c\u7aef\u53e3\u53f7
      \n struct sockaddr_in server = {
      \n .sin_family = AF_INET, \/\/ IPV4
      \n .sin_port = htons(PORT), \/\/ \u7aef\u53e3\u53f7\u8f6c\u6362\u4e3a\u7f51\u7edc\u5b57\u8282\u5e8f
      \n .sin_addr.s_addr = inet_addr(IP), \/\/ IP\u5730\u5740
      \n };
      \n if (bind(oldfd, (struct sockaddr *)&server, sizeof(server)) == -1) {
      \n perror(\\”<\/p>\n","protected":false},"excerpt":{"rendered":"

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