一个简单的服务器端的代码:
#include<stdio.h>
#include<stdlib.h>
#include<errno.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<unistd.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<netdb.h>
#include<string.h>
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!Are you fine?";
if(argc!=2) {
fprintf(stderr,"Usage:%s portnumber\n",argv[0]);
exit(1);
}
if((portnumber=atoi(argv[1]))<0) {
fprintf(stderr,"Usage:%s portnumber should greater than zero\n",argv[0]);
exit(1);
}
if((sockfd=socket(AF_INET,SOCK_STREAM,0))==-1) {
fprintf(stderr,"Socket error:%s a\n",strerror(errno));
exit(1);
}
bzero(&server_addr,sizeof(struct sockaddr_in));
server_addr.sin_family=AF_INET;
server_addr.sin_addr.s_addr=htonl(INADDR_ANY);
server_addr.sin_port=htons(portnumber);
if(bind(sockfd,(struct sockaddr*)(&server_addr),sizeof(struct sockaddr))==-1)
{
fprintf(stderr,"Bind error\n",strerror(errno));
exit(1);
}
if(listen(sockfd,5)==-1) {
fprintf(stderr,"Listen error:%s\n",strerror(errno));
exit(1);
}
while(1) {
sin_size = sizeof(struct sockaddr_in);
if((new_fd=accept(sockfd,(struct sockaddr*)(&client_addr),(socklen_t*)(&sin_size)))==-1)
{
fprintf(stderr,"Accept error:%s\n",strerror(errno));
exit(1);
}
fprintf(stderr,"Server get connnection from %s\n",inet_ntoa(client_addr.sin_addr));
if(write(new_fd,hello,strlen(hello))==-1) {
fprintf(stderr,"Write error:%s",strerror(errno));
exit(1);
}
close(new_fd);
}
close(sockfd);
exit(0);
}
原文链接: https://www.cnblogs.com/crazyleeyang/archive/2012/04/13/2446207.html
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