linux c recv 阻塞

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

int main() {
    int sock = socket(AF_INET, SOCK_STREAM, 0);
    if (sock == -1) {
        perror("Could not create socket");
        return 1;
    }

    struct sockaddr_in server;
    server.sin_addr.s_addr = inet_addr("127.0.0.1");
    server.sin_family = AF_INET;
    server.sin_port = htons(8888);

    if (connect(sock, (struct sockaddr *)&server, sizeof(server)) < 0) {
        perror("Connection failed");
        return 1;
    }

    char buffer[1024] = {0};
    int bytes_received = recv(sock, buffer, sizeof(buffer), 0);
    if (bytes_received < 0) {
        perror("recv failed");
        return 1;
    }

    printf("Received: %s\n", buffer);

    close(sock);
    return 0;
}