请教高手，linux中select函数的问题
最近刚刚学习linux下的socket编程，在实现多客户端通信的时候，服务器端原本用gethostbyname函数可以成功，但是现在想用getAddrinfo函数使得IPv4、IPv6都能用时，select函数无法判断客户端的连接，程序被阻塞在select这一句，不知道哪里出问题了，请教各位高手帮忙解答下，谢拉啊！
Server端程序
#include<sys/socket.h>
#include<iostream>
#include<sys/types.h>
#include<strings.h>
#include<stdlib.h>
#include<arpa/inet.h>
#include<netinet/in.h>
#include<string.h>
#include<stdio.h>
#include<sys/stat.h>
#include<fcntl.h>
#include<sys/select.h>
#include<pthread.h>
#define MAXSIZE 1024
#define MAXSOCKET 3
int count=0;
int get_file;
fd_set readfds;
void *get_client(void *);
using namespace std;
int main(int argc,char *argv[])
{
if(argc<3)
{
cout<<"Please enter port or file path:"<<endl;
exit(1);
}
int serverSock,confd;
//char *server_file;
struct sockaddr_in addr;
pthread_t thread_test;
socklen_t addr_len=sizeof(addr);
if((serverSock=socket(AF_INET,SOCK_STREAM,0))<0)
{
cout<<"socket failed!"<<endl;
exit(1);
}
in_port_t port=atoi(argv[1]);
if((get_file=open("/home/tracy/software/sock_file/test",O_WRONLY|O_CREAT|O_APPEND,S_IRUSR|S_IWUSR))==-1)
{
cout<<"Can't find file!"<<endl;
exit(1);
}
// server_file=get_file;
bzero(&addr,sizeof(addr));
addr.sin_family=AF_INET;
addr.sin_port=htons(port);
// addr.sin_port=htons("4000");
addr.sin_addr.s_addr=htonl(INADDR_ANY);
if(bind(serverSock,(struct sockaddr*) &addr,sizeof(addr))<0)
{
cout<<"bind failed!"<<endl;
exit(1);
}
if(listen(serverSock,3)<0)
{
cout<<"listen failed!"<<endl;
exit(1);
}
while(1)
{
FD_ZERO(&readfds);
FD_SET(serverSock,&readfds);
if(select(MAXSOCKET+1,&readfds,NULL,NULL,0))
{
if(FD_ISSET(serverSock,&readfds)>0)
{
confd=accept(serverSock,(struct sockaddr*)&addr,&addr_len);
count=count+1;
pthread_create(&thread_test,NULL,&get_client,(void*)confd);
}
}
}
}
void *get_client(void *newSock)
{
char buffer[MAXSIZE];
int recv_write;
// char *server_file;
/*if(count<=MAXSOCKET)
{
if(recv((int)newSock,buffer,MAXSIZE,0)<0)
{
cout<<"receive failed!"<<endl;
return NULL;
}
cout<<"connect client:"<<endl;
cout<<buffer<<endl;
if(send((int)newSock,"hello,I'm server!",strlen("hello,I'm server!")+1,0)<0)
{
cout<<"send failed!"<<endl;
return NULL;
}
close((int)newSock);
}
else
send((int)newSock,"client full!",strlen("client full!")+1,0);*/
if(count<=MAXSOCKET)
{
while((recv_write=recv((int)newSock,buffer,MAXSIZE,0))!=0)
{
if(recv_write==-1)
{
cout<<"recieve failed!"<<endl;
break;
}
if(write(get_file,buffer,recv_write)<0)
{
cout<<"write failed!"<<endl;
break;
}
bzero(buffer,strlen(buffer));
}
// cout<<"recieve end!"<<endl;
// send((int)newSock,"recieve end!",strlen("recieve end!")+1,0);
cout<<"receive file success!"<<endl;
send((int)newSock,"client full!",strlen("client full!")+1,0);
}
else
cout<<"client full!"<<endl;
count=count-1;
return(NULL);
}
Client端程序：
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <iostream>
#include <stdlib.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <netdb.h>
#include <fcntl.h>
#define BUFFER_SIZE 20
using namespace std;
int main(int argc,char *argv[])
{
int client_file,in_read,send_val,get_addr,clinSock;
char buffer[BUFFER_SIZE];
char *local_port,*servIP;
struct addrinfo addr_info;
struct addrinfo *p_addrinfo;
// struct hostent *host;
if(argc!=4)
{
cout<<"Please enter server's information(IP,PORT,FILEPATH):\n";
exit(1);
}
if((client_file=open(argv[3],O_RDONLY))==-1)
{
cout<<"File can't find!"<<endl;
exit(1);
}
// if((host=gethostbyname(argv[1]))==NULL)
// {
// cout<<"Gethostbyname failed!"<<endl;
// exit(1);
// }
servIP = argv[1];
local_port = argv[2];
bzero( &addr_info,sizeof(addr_info));
addr_info.ai_family = AF_UNSPEC;
// addr_info.ai_flags = AI_PASSIVE;
addr_info.ai_socktype = SOCK_STREAM;
addr_info.ai_protocol = IPPROTO_TCP;
if((get_addr = getaddrinfo(servIP, local_port, &addr_info, &p_addrinfo)) < 0)
{
cout<<"getaddinfo failed!"<<endl;
exit(1);
}
clinSock = socket(p_addrinfo->ai_family, p_addrinfo->ai_socktype, p_addrinfo->ai_protocol);
if(clinSock<0)
{
cout<<"socket failed!"<<endl;
exit(1);
}
if((connect(clinSock, p_addrinfo->ai_addr, p_addrinfo->ai_addrlen)) < 0)
{
cout<<"connect failed!"<<endl;
exit(1);
}
while((in_read = read(client_file,buffer,sizeof(buffer))) > 0)
{
cout<<buffer<<endl;
send_val = send(clinSock,buffer,in_read,0);
if(send_val == -1)
{
cout<<"send failed!"<<endl;
break;
}
}
if(in_read < 0)
cout<<"read failed!"<<endl;
buffer[in_read]='\0';
cout<<"send success!"<<endl;
close(clinSock);
}
[解决办法]
select(serverSock+1,&readfds,NULL,NULL,0)
怎样？
