我刚开始接触linux下的socket编程，边抄边理解udp socket编程，我的疑问是server不指定IP地址，client的目标IP地址是127.0.0.1，这样就可以通信吗？在同一主机下是不是不能测试？如果server默认绑定本机的IP 地址，那么开启server后，在浏览器中输入127.0.0.1:(相应端口) 也可以得到数据？我的程序如下，没有跑起来，其实我觉得我不会测试，不知道本质所以会有细节漏掉。（使用的系统是ubuntu 11.10 ，编译器GCC ，分别在同一主机下的两个终端中运行生成的.out文件。）提前感谢大家的回答，不管多少，您的回答让一个初学者非常暖心～～
服务器程序
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#include<stdio.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<unistd.h>
#include<sys/types.h>
#include<sys/socket.h>
#define lport 4567
int
main()
{
int
mysock,len;
struct
sockaddr_in addr;
int
i=0;
char
msg[256];
int
addr_len;
if
((mysock=socket(AF_INET,SOCK_DGRAM,0))<0)
{
perror
(
"error"
);
exit
(1);
}
else
{
printf
(
"socket created.n"
);
printf
(
"socket ID: %dn"
,mysock);
}
addr_len=
sizeof
(
struct
sockaddr_in);
bzero(&addr,
sizeof
(addr));
addr.sin_family=AF_INET;
addr.sin_port=htons(lport);
addr.sin_addr.s_addr=htonl(INADDR_ANY);
if
(bind(mysock,&addr,
sizeof
(addr))<0)
{
perror
(
"connect"
);
exit
(1);
}
else
{
printf
(
"bind ok.n"
);
printf
(
"local port: %dn"
,lport);
}
while
(1)
{
bzero(msg,
sizeof
(msg));
len=recvfrom (mysock,msg,
sizeof
(msg),0,&addr,&addr_len);
printf
(
"%d: "
,i);
i++;
printf
(
"message form: %sn"
,inet_ntoa(addr.sin_addr));
printf
(
"message: %snn"
,msg);
sendto(mysock,msg,len,0,&addr,addr_len);
}
return
0;
}
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客户机程序：
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#include<stdio.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<unistd.h>
#include<fcntl.h>
#include<sys/stat.h>
#include<sys/types.h>
#include<sys/socket.h>
#define rport 4567
#define rip "127.0.0.1"
int
main()
{
int
s,len;
struct
sockaddr_in addr;
int
addr_len;
char
msg[256];
int
i=0;
if
((s=socket(AF_INET,SOCK_DGRAM,0))<0)
{
perror
(
"error"
);
exit
(1);
}
else
{
printf
(
"socket created.n"
);
printf
(
"socket id: %dn"
,s);
printf
(
"romote ip: %sn"
,rip);
printf
(
"remote port: %dn"
,rport);
}
len=
sizeof
(
struct
sockaddr_in);
bzero(&addr,
sizeof
(addr));
addr.sin_family=AF_INET;
addr.sin_port=htons(rport);
addr.sin_addr.s_addr=inet_addr(rip);
while
(1)
{
bzero(msg,
sizeof
(msg));
len=read(STDIN_FILENO,msg,
sizeof
(msg));
sendto(s,msg,len,0,&addr,addr_len);
printf
(
"nInput message: %sn"
,msg);
len=recvfrom(s,msg,
sizeof
(msg),0,&addr,&addr_len);
printf
(
"%d :"
,i);
i++;
printf
(
"received message: %s n"
,msg);
}
return
0;
}
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原文：http://www.cnblogs.com/dpf-learn/p/6175689.html
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