代码如下
server.c
#include
#include
#include
#include
#include
#include
#include
#include
int main(int argc, char *argv[])
{
int sockfd,new_fd;
struct sockaddr_in server_addr;
struct sockaddr_in client_addr;
int sin_size,portnumber;
char hello[]="hello";
if(argc!=2)
{
fprintf(stderr,"Usage:%s portnumber\a\n",argv[0]);
exit(1);
}
if((portnumber=atoi(argv[1]))<0)
{
fprintf(stderr,"Socket error:%s\n\a",strerror(errno));
exit(1);
}
bzero(&server_addr,sizeof(struct sockaddr_in));
server_addr.sin_family=AF_INET;
server_addr.sin_port=htons(8888);
server_addr.sin_addr.s_addr=htonl(INADDR_ANY);
if(bind(sockfd,(struct sockaddr *)(&server_addr),sizeof(struct sockaddr))==-1)
{
fprintf(stderr,"bind error:%s\n\a",strerror(errno));
exit(1);
}
if(listen(sockfd,5)==-1)
{
fprintf(stderr,"listen error:%s\n\a",strerror(errno));
exit(1);
}
while(1)
{
sin_size=sizeof(struct sockaddr_in);
if((new_fd=accept(sockfd,(struct sockaddr *)(&client_addr),&sin_size))==-1)
{
fprintf(stderr,"Accept error:%s\n\a",strerror(errno));
exit(1);
}
fprintf(stderr,"server get connection from %s\n",inet_ntoa(client_addr.sin_addr));
if(write(new_fd,hello,strlen(hello))==-1)
{
fprintf(stderr,"write error:%s\n",strerror(errno));
exit(1);
}
close(new_fd);
}
close(sockfd);
exit(0);
}
client.c
#include
#include
#include
#include
#include
#include
#include
#include
int main(int argc,char *argv[])
{
int sockfd;
char buffer[1024];
struct sockaddr_in server_addr;
struct hostent *host;
int portnumber,nbytes;
if(argc!=3)
{
fprintf(stderr,"Usage:%s hostname portnumber\a\n",argv[0]);
exit(1);
}
if((host=gethostbyname(argv[1]))==NULL)
{
fprintf(stderr,"gethostname error\n");
exit(1);
}
if((portnumber=atoi(argv[2]))<0)
{
fprintf(stderr,"Usage:%s hostname portnumber\a\n",argv[0]);
exit(1);
}
printf("%d\n",portnumber);
if((sockfd=socket(AF_INET,SOCK_STREAM,0))==-1)
{
fprintf(stderr,"socket error:%s\a\n",strerror(errno));
exit(1);
}
bzero(&server_addr,sizeof(server_addr));
server_addr.sin_family=AF_INET;
server_addr.sin_port=htons(portnumber);
server_addr.sin_addr=*((struct in_addr *)host->h_addr);
if(connect(sockfd,(struct sockaddr *)(&server_addr),sizeof(struct sockaddr))==-1)
{
fprintf(stderr,"connect error:%s\a\n",strerror(errno));
exit(1);
}
if((nbytes=read(sockfd,buffer,1024))==-1)
{
fprintf(stderr,"read error:%s\n",strerror(errno));
exit(1);
}
buffer[nbytes]='\0';
printf("i have received:%s\n",buffer);
close(sockfd);
exit(0);
}
deepwhite 于 2011-01-05 08:46:06发表:
[i=s] 本帖最后由 deepwhite 于 2011-1-5 08:52 编辑 [/i]
server.c 中代码不全，还没有创建 socket 就直接 bind 了。
仔细看看相关教程吧。
或者参考 client 中创建 socket 的代码。