Linux本地套接字(Unix域套接字)----SOCK_DGRAM方式
2024-10-10 00:19:46
目录
简述
这里介绍一下Linux进程间通信的socket方式---Local socket。这篇主要是介绍下SOCK_DGRAM方式的通信,即数据包的方式(与UDP类似),面向无连接。
这个代码是我刚开始学的时候写的,代码比较简单,适合初学,学习最快的方式就是直接拿源码修改、编译运行、调试。
完整源代码:https://gitee.com/fensnote/demo_code/tree/master/Linux/unix_socket
创建服务端代码:
int startServer()
{
int iRet;
TSockAddrUn serv_unadr;
TSockAddrIn serv_inadr;
TSockAddr *pSockAddr = NULL;
bzero(&serv_unadr,sizeof(serv_unadr));
bzero(&serv_inadr,sizeof(serv_inadr));
serv_unadr.sun_family = AF_UNIX;
strcpy(serv_unadr.sun_path,UNIX_SOCKET_PATH);
pSockAddr = (TSockAddr *)&serv_unadr;
signal(SIGPIPE, SIG_IGN);
/* 创建本地socket */
sockFd = socket(AF_UNIX, SOCK_DGRAM, 0);//数据包方式
if ( sockFd <= 0)
{
perror("socket error");
return sockFd;
}
/* 绑定监听口 */
int flag = 1;
iRet = setsockopt(sockFd, SOL_SOCKET, SO_REUSEADDR, &flag, sizeof(flag));
setSocketAttr(sockFd);
unlink(UNIX_SOCKET_PATH);
iRet = bind(sockFd, pSockAddr, sizeof(TSockAddr));
if (iRet != 0)
{
perror("bind error");
close(sockFd);
return -1;
}
return sockFd;
}
创建客户端代码
面向无连接的方式,和服务端的代码差别不大:
int InitUdpClient()
{
TSockAddrUn unadr;
TSockAddr *pSockAddr = NULL;
bzero(&unadr,sizeof(unadr));
char tmpPath[] = "/tmp/unix_XXXX";
char *tmpName = mktemp(tmpPath);
unadr.sun_family = AF_LOCAL;
strcpy(unadr.sun_path, tmpName);
pSockAddr = (TSockAddr *)&unadr;
/* 创建本地socket */
sockFd = socket(AF_LOCAL, SOCK_DGRAM, 0);//数据包方式
if ( sockFd <= 0)
{
perror("CUdpClient:: socket error");
return sockFd;
}
unlink(tmpPath);
/* 绑定监听口 */
//setSocketAttr(sockFd);
int iRet = bind(sockFd,pSockAddr, sizeof(TSockAddr));
if (iRet != 0)
{
perror("bind error");
close(sockFd);
return -1;
}
return sockFd;
}
接收函数封装
//返回0 超时 timeOut-超时时间
int UnixRead(char *recvBuf, int len, int timeOut)
{
int nRead = readable_timeo(sockFd, timeOut);
if ( nRead <= 0 )
{
printf("UnixRead, read time out!\n");
return 0;
}
pSockAddr = (TSockAddr *)&unClientaddr;
socklen = sizeof(TSockAddrUn);
bzero(recvBuf, len);
nRead = recvfrom(sockFd, recvBuf, len, 0, pSockAddr, &socklen);
if ( nRead <= 0 )
{
if ( (EAGAIN == errno) || (EINTR == errno))
{
return 0; //接收连接超时
}
perror("UnixRead read error:");
}
return nRead;
}
发送封装
int UnixSend(const void *data, int len)
{
TSockAddrUn unadr;
TSockAddr *pSockAddr = NULL;
bzero(&unadr,sizeof(unadr));
unadr.sun_family = AF_LOCAL;
strcpy(unadr.sun_path, UNIX_SOCKET_PATH);
pSockAddr = (TSockAddr *)&unadr;
socklen_t socklen = sizeof(TSockAddrUn);
return sendto(sockFd, data, len, 0, pSockAddr, socklen);
}
服务端测试main函数
int main()
{
startServer();
int nRead = 0;
char recvBuf[1024] = {0};
while(1)
{
nRead = UnixRead(recvBuf, 1024, 5);
if ( nRead <= 0 )
{
continue;
}
else
{
printf("recv %d data: %s\n",nRead, recvBuf);
const char *sendMsg = "svr ack!";
UnixSend(sendMsg, strlen(sendMsg));
}
sleep(1);
}
return 0;
}
客户端测试main函数
int main( )
{
int sockFd = InitUdpClient();
int nRead = 0;
const char *sendMsg = "hello";
char recvBuf[1024] = {0};
while(1)
{
nRead = UnixSend(sendMsg, strlen(sendMsg));
printf("send %d data: %s\n", nRead, sendMsg);
nRead = UnixRead(recvBuf, 1024, 5);
printf("recv %d data: %s\n", nRead, recvBuf);
sleep(2);
}
return 0;
}
编译运行结果
左边是服务端,右边是客户端。
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