写一下基于linux下c语言，飞鸽传书。基于TCP协议写的文件传输，UDP协议的消息传输，还有LINUX下多线程操作的代码

好的，下面是基于Linux下C语言的飞鸽传书代码，包括TCP协议的文件传输、UDP协议的消息传输和多线程操作。

1. TCP协议的文件传输

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

#define BUF_SIZE 1024

void error_handling(char *message);

int main(int argc, char *argv[])
{
    int serv_sock, clnt_sock;
    char message[BUF_SIZE];
    int str_len, fd, len = 0;
    struct sockaddr_in serv_addr, clnt_addr;
    socklen_t clnt_addr_size;
    char file_name[BUF_SIZE];
    char buf[BUF_SIZE];

    if (argc != 2) {
        printf("Usage: %s <port>\n", argv[0]);
        exit(1);
    }

    serv_sock = socket(PF_INET, SOCK_STREAM, 0);
    if (serv_sock == -1) {
        error_handling("socket() error");
    }

    memset(&serv_addr, 0, sizeof(serv_addr));
    serv_addr.sin_family = AF_INET;
    serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
    serv_addr.sin_port = htons(atoi(argv[1]));

    if (bind(serv_sock, (struct sockaddr*)&serv_addr, sizeof(serv_addr)) == -1) {
        error_handling("bind() error");
    }

    if (listen(serv_sock, 5) == -1) {
        error_handling("listen() error");
    }

    clnt_addr_size = sizeof(clnt_addr);
    clnt_sock = accept(serv_sock, (struct sockaddr*)&clnt_addr, &clnt_addr_size);
    if (clnt_sock == -1) {
        error_handling("accept() error");
    }

    read(clnt_sock, message, BUF_SIZE);
    printf("Received file name: %s\n", message);

    fd = open(message, O_RDONLY);
    if (fd == -1) {
        error_handling("open() error");
    }

    while ((str_len = read(fd, buf, BUF_SIZE)) != 0) {
        write(clnt_sock, buf, str_len);
    }

    close(fd);
    close(clnt_sock);
    close(serv_sock);
    return 0;
}

void error_handling(char *message)
{
    fputs(message, stderr);
    fputc('\n', stderr);
    exit(1);
}

2. UDP协议的消息传输

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

#define BUF_SIZE 1024

void error_handling(char *message);

int main(int argc, char *argv[])
{
    int sock;
    char message[BUF_SIZE];
    int str_len, i;
    struct sockaddr_in serv_addr, from_addr;
    socklen_t adr_sz;

    if (argc != 3) {
        printf("Usage: %s <IP> <port>\n", argv[0]);
        exit(1);
    }

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

    memset(&serv_addr, 0, sizeof(serv_addr));
    serv_addr.sin_family = AF_INET;
    serv_addr.sin_addr.s_addr = inet_addr(argv[1]);
    serv_addr.sin_port = htons(atoi(argv[2]));

    while (1) {
        fputs("Input message(Q to quit): ", stdout);
        fgets(message, BUF_SIZE, stdin);
        if (!strcmp(message, "q\n") || !strcmp(message, "Q\n")) {
            break;
        }
        sendto(sock, message, strlen(message), 0, (struct sockaddr*)&serv_addr, sizeof(serv_addr));
        adr_sz = sizeof(from_addr);
        str_len = recvfrom(sock, message, BUF_SIZE, 0, (struct sockaddr*)&from_addr, &adr_sz);
        message[str_len] = 0;
        printf("Received message: %s", message);
    }

    close(sock);
    return 0;
}

void error_handling(char *message)
{
    fputs(message, stderr);
    fputc('\n', stderr);
    exit(1);
}

3. 多线程操作

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

#define BUF_SIZE 1024

void error_handling(char *message);
void* client_handler(void* arg);

int main(int argc, char *argv[])
{
    int serv_sock, clnt_sock;
    struct sockaddr_in serv_addr, clnt_addr;
    socklen_t clnt_addr_size;
    pthread_t t_id;

    if (argc != 2) {
        printf("Usage: %s <port>\n", argv[0]);
        exit(1);
    }

    serv_sock = socket(PF_INET, SOCK_STREAM, 0);
    if (serv_sock == -1) {
        error_handling("socket() error");
    }

    memset(&serv_addr, 0, sizeof(serv_addr));
    serv_addr.sin_family = AF_INET;
    serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
    serv_addr.sin_port = htons(atoi(argv[1]));

    if (bind(serv_sock, (struct sockaddr*)&serv_addr, sizeof(serv_addr)) == -1) {
        error_handling("bind() error");
    }

    if (listen(serv_sock, 5) == -1) {
        error_handling("listen() error");
    }

    while (1) {
        clnt_addr_size = sizeof(clnt_addr);
        clnt_sock = accept(serv_sock, (struct sockaddr*)&clnt_addr, &clnt_addr_size);
        if (clnt_sock == -1) {
            error_handling("accept() error");
        }
        pthread_create(&t_id, NULL, client_handler, (void*)&clnt_sock);
        pthread_detach(t_id);
        printf("Connected client IP: %s\n", inet_ntoa(clnt_addr.sin_addr));
    }

    close(serv_sock);
    return 0;
}

void* client_handler(void* arg) {
    int clnt_sock = *((int*)arg);
    int str_len = 0;
    char message[BUF_SIZE];

    while ((str_len = read(clnt_sock, message, BUF_SIZE)) != 0) {
        write(clnt_sock, message, str_len);
    }

    close(clnt_sock);
    return NULL;
}

void error_handling(char *message)
{
    fputs(message, stderr);
    fputc('\n', stderr);
    exit(1);
}