linux socket本地通信

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

int main() {
    int sockfd;
    struct sockaddr_in servaddr;

    sockfd = socket(AF_INET, SOCK_STREAM, 0);
    if (sockfd < 0) {
        perror("socket creation failed");
        return -1;
    }

    servaddr.sin_family = AF_INET;
    servaddr.sin_port = htons(8080);
    inet_pton(AF_INET, "127.0.0.1", &servaddr.sin_addr);

    struct timeval timeout;
    timeout.tv_sec = 10; // 10秒超时
    timeout.tv_usec = 0;
    setsockopt(sockfd, SOL_SOCKET, SO_SNDTIMEO, (char *)&timeout, sizeof(timeout));

    if (connect(sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr)) < 0) {
        perror("connection failed");
        close(sockfd);
        return -1;
    }

    close(sockfd);
    return 0;
}

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

#define BUFFER_SIZE 1024

int main() {
    int sockfd, new_socket;
    struct sockaddr_in servaddr, cliaddr;
    socklen_t len;
    char buffer[BUFFER_SIZE];

    sockfd = socket(AF_INET, SOCK_STREAM, 0);
    if (sockfd < 0) {
        perror("socket creation failed");
        return -1;
    }

    memset(&servaddr, 0, sizeof(servaddr));
    memset(&cliaddr, 0, sizeof(cliaddr));

    servaddr.sin_family = AF_INET;
    servaddr.sin_addr.s_addr = INADDR_ANY;
    servaddr.sin_port = htons(8080);

    if (bind(sockfd, (const struct sockaddr *)&servaddr, sizeof(servaddr)) < 0) {
        perror("bind failed");
        close(sockfd);
        return -1;
    }

    if (listen(sockfd, 5) < 0) {
        perror("listen");
        close(sockfd);
        return -1;
    }

    len = sizeof(cliaddr);
    new_socket = accept(sockfd, (struct sockaddr *)&cliaddr, &len);
    if (new_socket < 0) {
        perror("accept");
        close(sockfd);
        return -1;
    }

    int valread = read(new_socket, buffer, BUFFER_SIZE);
    if (valread < 0) {
        perror("read");
        close(new_socket);
        close(sockfd);
        return -1;
    }

    buffer[valread] = '\0';
    printf("Received message: %s\n", buffer);

    close(new_socket);
    close(sockfd);
    return 0;
}