Linux平台：一个简单的TCP6 server的示例代码(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);
}