Linux平臺：一個簡單的TCP6 server的示例代碼(socket)

#include <stdio.h>

#include <stdlib.h>

#include <errno.h>

#include <string.h>

#include <sys/types.h>

#include <netinet/in.h>

#include <sys/socket.h>

#include <sys/wait.h>

#include <unistd.h>

//#include <arpa/inet.h>

 

void error(const char *msg)

{

        perror(msg);

            exit(1);

}

 

int main(int argc, char *argv[])

{

    int sockfd, newsockfd, portno;

    socklen_t clilen;

    char buffer[256];

    struct sockaddr_in6 serv_addr, cli_addr;

    int n;

 

    sockfd = socket(AF_INET6, SOCK_STREAM, 0);

    if (sockfd < 0)

        error("ERROR opening socket");

   

    bzero((char *) &serv_addr, sizeof(serv_addr));

    portno = 5020;

 

    serv_addr.sin6_family = AF_INET6;

    serv_addr.sin6_addr = in6addr_any;//INADDR_ANY;

    serv_addr.sin6_port = htons(portno);

 

    if (bind(sockfd, (struct sockaddr *) &serv_addr,

        sizeof(serv_addr)) < 0)

        error("ERROR on binding");

 

    listen(sockfd,5);

 

    clilen = sizeof(cli_addr);

    newsockfd = accept(sockfd,

        (struct sockaddr *) &cli_addr,

        &clilen);

 

    if (newsockfd < 0)

        error("ERROR on accept");

 

    bzero(buffer,256);

    n = read(newsockfd,buffer,255);

 

    if (n < 0) error("ERROR reading from socket");

    printf("Here is the message: %s\n",buffer);

 

    n = write(newsockfd,"I got your message",18);

 

    if (n < 0) error("ERROR writing to socket");

    close(newsockfd);

    close(sockfd);

}