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Linux×÷Ϊһ¸ö¿ªÔ´²Ù×÷ϵͳ£¬ÆäÍøÂçЭÒéÕ»ÊÎÑÝ×ÅÖÁ¹ØÖ÷ÒªµÄ½ÇÉ«£¬ÈÏÕæ´¦Öóͷ£ÍøÂçÊý¾ÝµÄ´«Ê䡢·ÓÉ¡¢ÅþÁ¬ÖÎÀíµÈ¹¦Ð§¡£±¾ÎĽ«ÏÈÈÝLinuxЭÒéÕ»Öг£¼ûµÄһЩÍøÂçЭÒé¼°Æ书Ч£¬²¢¸½ÉÏÏêϸµÄ´úÂëʾÀý¡£

TCPЭÒé

TCP£¨Transmission Control Protocol£©ÊÇÒ»ÖÖÃæÏòÅþÁ¬µÄ¡¢¿É¿¿µÄ¡¢»ùÓÚ×Ö½ÚÔ¼µÄ´«ÊäЭÒé¡£ËüÌṩÁËÊý¾ÝÍêÕûÐÔУÑé¡¢Á÷Á¿¿ØÖÆ¡¢ÓµÈû¿ØÖƵȹ¦Ð§£¬°ü¹ÜÊý¾ÝµÄ¿É¿¿´«Êä¡£

ÏÂÃæÊÇÒ»¸ö¼òÆÓµÄʹÓÃTCPЭÒé¾ÙÐпͻ§¶ËÓëЧÀÍÆ÷ͨѶµÄʾÀý£º

// TCP client
#include <sys/socket.h>
#include <netinet/in.h>
#include <stdio.h>
#include <string.h>

int main() {
    int sockfd;
    struct sockaddr_in server_addr;
    char buffer[1024];

    sockfd = socket(AF_INET, SOCK_STREAM, 0);

    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(8080);
    server_addr.sin_addr.s_addr = inet_addr("127.0.0.1");

    connect(sockfd, (struct sockaddr*)&server_addr, sizeof(server_addr));

    send(sockfd, "Hello, server!", strlen("Hello, server!"), 0);

    recv(sockfd, buffer, sizeof(buffer), 0);

    printf("%s
", buffer);

    close(sockfd);

    return 0;
}

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// TCP server
#include <sys/socket.h>
#include <netinet/in.h>
#include <stdio.h>
#include <string.h>

int main() {
    int sockfd, client_sock;
    struct sockaddr_in server_addr, client_addr;
    char buffer[1024];

    sockfd = socket(AF_INET, SOCK_STREAM, 0);

    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(8080);
    server_addr.sin_addr.s_addr = htonl(INADDR_ANY);

    bind(sockfd, (struct sockaddr*)&server_addr, sizeof(server_addr));

    listen(sockfd, 5);

    int addr_len = sizeof(client_addr);
    client_sock = accept(sockfd, (struct sockaddr*)&client_addr, &addr_len);

    recv(client_sock, buffer, sizeof(buffer), 0);

    printf("%s
", buffer);

    send(client_sock, "Hello, client!", strlen("Hello, client!"), 0);

    close(client_sock);
    close(sockfd);

    return 0;
}

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UDPЭÒé

UDP£¨User Datagram Protocol£©ÊÇÒ»ÖÖÎÞÅþÁ¬µÄ¡¢²»¿É¿¿µÄ´«ÊäЭÒ飬Ëü²»°ü¹ÜÊý¾ÝµÄ¿É¿¿ÐÔÎÂ˳ÐòÐÔ£¬ÊÊÓÃÓÚһЩʵʱÐÔÒªÇó½Ï¸ßµÄ³¡¾°¡£

ÏÂÃæÊÇÒ»¸ö¼òÆÓµÄʹÓÃUDPЭÒé¾ÙÐпͻ§¶ËÓëЧÀÍÆ÷ͨѶµÄʾÀý£º

// UDP client
#include <sys/socket.h>
#include <netinet/in.h>
#include <stdio.h>
#include <string.h>

int main() {
    int sockfd;
    struct sockaddr_in server_addr;
    char buffer[1024];

    sockfd = socket(AF_INET, SOCK_DGRAM, 0);

    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(8080);
    server_addr.sin_addr.s_addr = inet_addr("127.0.0.1");

    sendto(sockfd, "Hello, server!", strlen("Hello, server!"), 0, (struct sockaddr*)&server_addr, sizeof(server_addr));

    recv(sockfd, buffer, sizeof(buffer), 0);

    printf("%s
", buffer);

    close(sockfd);

    return 0;
}

µÇ¼ºó¸´ÖÆ

// UDP server
#include <sys/socket.h>
#include <netinet/in.h>
#include <stdio.h>
#include <string.h>

int main() {
    int sockfd;
    struct sockaddr_in server_addr, client_addr;
    char buffer[1024];

    sockfd = socket(AF_INET, SOCK_DGRAM, 0);

    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(8080);
    server_addr.sin_addr.s_addr = htonl(INADDR_ANY);

    bind(sockfd, (struct sockaddr*)&server_addr, sizeof(server_addr));

    int addr_len = sizeof(client_addr);
    recvfrom(sockfd, buffer, sizeof(buffer), 0, (struct sockaddr*)&client_addr, &addr_len);

    printf("%s
", buffer);

    sendto(sockfd, "Hello, client!", strlen("Hello, client!"), 0, (struct sockaddr*)&client_addr, addr_len);

    close(sockfd);

    return 0;
}

µÇ¼ºó¸´ÖÆ

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