用setsockopt()函数实现允许地址快速重用，以及设置接收10秒超时的相关服务器和客户端代码

以下是使用setsockopt()函数实现允许地址快速重用和设置接收10秒超时的相关服务器和客户端代码：

服务器端代码：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

int main(int argc, char *argv[]) {
    int listen_fd = socket(AF_INET, SOCK_STREAM, 0);
    if (listen_fd == -1) {
        perror("socket");
        exit(EXIT_FAILURE);
    }

    // 允许地址重用
    int optval = 1;
    if (setsockopt(listen_fd, SOL_SOCKET, SO_REUSEADDR, &optval, sizeof(optval)) == -1) {
        perror("setsockopt");
        exit(EXIT_FAILURE);
    }

    // 设置10秒超时
    struct timeval timeout = {10, 0};
    if (setsockopt(listen_fd, SOL_SOCKET, SO_RCVTIMEO, (char *)&timeout, sizeof(timeout)) == -1) {
        perror("setsockopt");
        exit(EXIT_FAILURE);
    }

    struct sockaddr_in addr;
    memset(&addr, 0, sizeof(addr));
    addr.sin_family = AF_INET;
    addr.sin_port = htons(8080);
    addr.sin_addr.s_addr = htonl(INADDR_ANY);

    if (bind(listen_fd, (struct sockaddr *)&addr, sizeof(addr)) == -1) {
        perror("bind");
        exit(EXIT_FAILURE);
    }

    if (listen(listen_fd, 10) == -1) {
        perror("listen");
        exit(EXIT_FAILURE);
    }

    while (1) {
        int conn_fd = accept(listen_fd, NULL, NULL);
        if (conn_fd == -1) {
            if (errno == EINTR) {
                continue;
            }
            perror("accept");
            exit(EXIT_FAILURE);
        }

        // 处理连接
        close(conn_fd);
    }

    close(listen_fd);

    return 0;
}

客户端代码：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

int main(int argc, char *argv[]) {
    int sock_fd = socket(AF_INET, SOCK_STREAM, 0);
    if (sock_fd == -1) {
        perror("socket");
        exit(EXIT_FAILURE);
    }

    // 设置10秒超时
    struct timeval timeout = {10, 0};
    if (setsockopt(sock_fd, SOL_SOCKET, SO_RCVTIMEO, (char *)&timeout, sizeof(timeout)) == -1) {
        perror("setsockopt");
        exit(EXIT_FAILURE);
    }

    struct sockaddr_in addr;
    memset(&addr, 0, sizeof(addr));
    addr.sin_family = AF_INET;
    addr.sin_port = htons(8080);
    addr.sin_addr.s_addr = inet_addr("127.0.0.1");

    if (connect(sock_fd, (struct sockaddr *)&addr, sizeof(addr)) == -1) {
        perror("connect");
        exit(EXIT_FAILURE);
    }

    // 发送数据
    const char *msg = "hello";
    if (send(sock_fd, msg, strlen(msg), 0) == -1) {
        perror("send");
        exit(EXIT_FAILURE);
    }

    char buf[1024];
    int len = recv(sock_fd, buf, sizeof(buf), 0);
    if (len == -1) {
        if (errno == EINTR) {
            printf("timeout\n");
        } else {
            perror("recv");
            exit(EXIT_FAILURE);
        }
    } else {
        buf[len] = '\0';
        printf("recv: %s\n", buf);
    }

    close(sock_fd);

    return 0;
}