linux udp服务器和客户端

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

#define BUF_SIZE 1024

int main() {
    int serv_sock;
    struct sockaddr_in serv_adr, clnt_adr;
    socklen_t clnt_adr_sz;
    char buf[BUF_SIZE];

    if ((serv_sock = socket(PF_INET, SOCK_DGRAM, 0)) == -1) {
        perror("socket() error");
        exit(1);
    }

    memset(&serv_adr, 0, sizeof(serv_adr));
    serv_ad::sin_family = AF_INET;
    serv_adr.sin_addr.s_addr = htonl(INADDR_ANY);
    serv_adr.sin_port = htons(6000);

    if (bind(serv_sock, (struct sockaddr*)&serv_adr, sizeof(serv_adr)) == -1) {
        perror("bind() error");
        exit(1);
    }

    while (1) {
        clnt_adr_sz = sizeof(clnt_adr);
        int str_len = recvfrom(serv_sock, buf, BUF_SIZE, 0, (struct sockaddr*)&clnt_adr, &clnt_adr_sz);
        sendto(serv_sock, buf, str_len, 0, (struct sockaddr*)&clnt_adr, clnt_adr_sz);
    }

    close(serv_sock);
    return 0;
}

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

#define BUF_SIZE 1024

int main() {
    int sock;
    struct sockaddr_in serv_adr;
    char buf[BUF_SIZE];

    if ((sock = socket(PF_INET, SOCK_DGRAM, 0)) == -1) {
        perror("socket() error");
        exit(1);
    }

    memset(&serv_adr, 0, sizeof(serv_adr));
    serv_adr.sin_family = AF_INET;
    serv_adr.sin_addr.s_addr = inet_addr("127.0.0.1");
    serv_adr.sin_port = htons(6000);

    while (1) {
        fputs("Input message(Q to quit): ", stdout);
        fgets(buf, BUF_SIZE, stdin);
        int len = strlen(buf);
        if (!strcmp(buf, "q\n") || !strcmp(buf, "Q\n"))
            break;

        sendto(sock, buf, len, 0, (struct sockaddr*)&serv_adr, sizeof(serv_adr));
        int str_len = recvfrom(sock, buf, BUF_SIZE, 0, NULL, 0);
        buf[str_len] = 0;
        printf("Message from server: %s", buf);
    }

    close(sock);
    return 0;
}