我已经尝试在后台运行我的服务器,它显示在 ps 下,我可以看到我的服务器正在运行,但是当我尝试运行客户端时,正确的服务器应该写信给客户端说“成功连接到服务器”,但什么也没有在那里输出。
我的服务器代码
#include <iostream>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/un.h>
#include <sys/types.h>
#include <sys/socket.h>
#ifndef AF_LOCAL
#define AF_LOCAL AF_UNIX
#endif
#ifndef PF_LOCAL
#define PF_LOCAL PF_UNIX
#endif
using namespace std;
int main()
{
int serverFd;
int clientFd;
int serverLen;
int clientLen;
string message;
string serverSockAddrPtr;
struct sockaddr* serverSockAddressPnt;
struct sockaddr* clientSockAddressPnt;
struct sockaddr_un serverAddress;
struct sockaddr_un clientAddress;
cout << "" << endl;
cout << "Running server program 'css' ...... " << endl;
cout << "" << endl;
// SOCKET CREATION PART - SERVER
serverFd = socket (AF_LOCAL, SOCK_STREAM, 0);
/* Set domain type */
serverAddress.sun_family = AF_LOCAL;
/* Set name */
strcpy (serverAddress.sun_path, "CServer");
/* GET SIZE OF Server Addres */
serverLen = sizeof serverAddress;
/* GET SIZE OF Client Addres */
clientLen = sizeof clientAddress;
/* Get Server Sock Address Pointer*/
serverSockAddressPnt = (struct sockaddr *) &serverAddress;
/* Get Client Sock Address Pointer*/
clientSockAddressPnt = (struct sockaddr *) &clientAddress;
/* Create file */
bind (serverFd, serverSockAddressPnt , serverLen);
/* listen for connection */
listen (serverFd,5);
cout << "" << endl;
// SOCKET CREATION END - SERVER
while(1)
{
//accept client connection
clientFd = accept(serverFd, clientSockAddressPnt, (socklen_t*)&clientLen);
if(clientFd >= 0)
{
if(fork() == 0)
{
message="Successfully connected to the server";
write(clientFd,message.c_str(),strlen(message.c_str())+1);
close(clientFd);
exit(0);
}
else
close(clientFd);
}
}
return 0;
}
我的客户端代码
#include <iostream>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/un.h>
#include <sys/types.h>
#include <sys/socket.h>
#define DEFAULT_PROTOCOL 0
#ifndef AF_LOCAL
#define AF_LOCAL AF_UNIX
#endif
#ifndef PF_LOCAL
#define PF_LOCAL PF_UNIX
#endif
using namespace std;
/* READ LINE FUNCTION*/
int readLine (int fd,char* str)
{
int n;
do
{
n = read(fd,str,1);
}while(n>0&& *str++ != 0);
return(n>0);
}
/* READ LINE FUNCTION END*/
/* READ SERVER FUNCTION*/
void readServer (int fd)
{
char str[500];
while (readLine(fd,str))
{
printf("%s",str);
}
}
/* READ SERVER FUNCTION END*/
int main()
{
int clientFd,serverLen,result;
struct sockaddr_un serverAddress;
struct sockaddr* serverSockAddressPnt;
/* Get Server Sock Address Pointer*/
serverSockAddressPnt = (struct sockaddr *) &serverAddress;
/* GET SIZE OF Server Addres */
serverLen = sizeof serverAddress;
clientFd = socket (AF_LOCAL, SOCK_STREAM, DEFAULT_PROTOCOL);
serverAddress.sun_family = AF_LOCAL;
strcpy (serverAddress.sun_path,"CServer");
do
{
// a loop to keep trying till connected.
result=connect(clientFd,serverSockAddressPnt,serverLen);
if(result==-1)
{
//wait for 1 second to retry
sleep(1);
}
}while(result==-1);
readServer (clientFd);
close (clientFd);
exit(0);
return 0;
}
最佳答案
您的serverAddress
变量未初始化。我没有检查这一点,但很可能 serverAddress.sun_path
是一个指向 char
的指针,然后它只是用随机值初始化。这个
strcpy (serverAddress.sun_path,"CServer");
然后覆盖一些任意内存。在 C 中执行此操作的正确方法是
struct sockaddr_un serverAddress = { 0 };
一般情况下:
总是,是的,总是,初始化所有变量。不要担心不这样做可能会带来效率上的一些微小改进。这通常是不值得的,而且无论如何你还没有到达那里。 (这里使用
0
进行正确的初始化将使您的程序从一开始就很好地崩溃。)始终在所有警告选项打开的情况下进行编译。
不要混合使用 C 和 C++。它们之间存在细微的差异,这是不值得的。特别是在这里,使用 C++ 不会带来任何好处。
关于c++ - 为什么我的服务器不向我的客户端发送任何内容,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/11771266/