udp接收缓冲区 linux

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

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

    if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
        perror("socket");
        exit(1);
    }

    // 设置接收缓冲区大小为 2MB
    int rcvbuf_size = 2 * 1024 * 1024; // 2MB
    if (setsockopt(sockfd, SOL_SOCKET, SO_RCVBUF, &rcvbuf_size, sizeof(rcvbuf_size)) < 0) {
        perror("setsockopt");
        exit(1);
    }

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

    if (bind(sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr)) < 0) {
        perror("bind");
        exit(1);
    }

    // 接收数据...
    char buffer[1024];
    ssize_t n = recvfrom(sockfd, buffer, sizeof(buffer), 0, NULL, NULL);
    if (n < 0) {
        perror("recvfrom");
        exit(1);
    }

    printf("Received data: %s
", buffer);

    close(sockfd);
    return 0;
}