Question

学习Linux下的网络编程时，写的例子，bind() 这块报错，求大神指导一下，原因。下面是代码和错误

[root@bogon Desktop]# ./tcp_ser
Bind() error: Invalid argument
[root@bogon Desktop]# cat tcp_ser.c
#include <stdio.h>
#include <strings.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#define PORT 9999
#define BACKLOG 1

main()

{
int listenfd, connectfd;
struct sockaddr_in server;
struct sockaddr_in client;
socklen_t addrlen;
listenfd = socket(AF_INET6, SOCK_STREAM, 0);
if(listenfd ==-1)
{
perror("socket() error.");
exit(1);
}

int opt = SO_REUSEADDR ;
setsockopt(listenfd, SOL_SOCKET,SO_REUSEADDR,&opt ,sizeof(opt));
bzero(&server,sizeof(server));

server.sin_family=AF_INET;
server.sin_port=htons(PORT);
server.sin_addr.s_addr = htonl(INADDR_ANY);

if(bind(listenfd,(struct sockaddr *) &server,sizeof(server)) == -1)
{
perror("Bind() error");
exit(1);
}
if(listen(listenfd,BACKLOG) == -1)
{
perror("listen() error.\n");
exit(1);
}
int len = sizeof(client);
if((connectfd = accept(listenfd,(struct sockaddr *)&client,&addrlen)) == -1)
{
perror("accept() error\n");
exit(1);
}

printf("You got a connection from client's ip is %s,port is%d\n",inet_ntoa(client.sin_addr),htons(client.sin_port));

send(connectfd,"Welcome\n",8,0);
close(connectfd);
close(listenfd);

}
[root@bogon Desktop]#

Answer 1

AF_INET6 改成 AF_INET4试试，你的主机用的是IPV6协议吗？

追问

这个改成AF_INET ，也是报同样的错