recv Linux下设置阻塞

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

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

    // 创建套接字
    if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
        perror("socket creation failed");
        exit(EXIT_FAILURE);
    }

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

    // 配置服务器地址
    servaddr.sin_family = AF_INET;
    servaddr.sin_port = htons(8080);
    servaddr.sin_addr.s_addr = INADDR_ANY;

    // 连接到服务器
    if (connect(sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr)) != 0) {
        perror("connection with the server failed");
        exit(EXIT_FAILURE);
    }

    char buffer[1024];
    int n = recv(sockfd, buffer, sizeof(buffer), 0);
    if (n < 0) {
        perror("recv failed");
    } else {
        buffer[n] = '\0';
        printf("Received message: %s\n", buffer);
    }

    close(sockfd);
    return 0;
}