/*! Read size bytes into the buffer. Wait until size Bytes are available
On Dgram sockets data maight be lossed, if size is smaller then the
incomming package. This situation will not be treated as an error.
The read bytes will not be removed from the in buffer. A call to
recv after peek will result in the same data.
\see recv Socket::recv
*/
int DgramSocket::peekFrom(void *buf,int size,SocketAddress &from)
{
int len;
SocketLenT addrLen=from.getSockAddrSize();
len=recvfrom(_sd,
static_cast<char *>(buf),
size,
MSG_PEEK,
from.getSockAddr(),
&addrLen);
if(len == -1)
{
#if defined WIN32
if(getError() == WSAECONNRESET)
{
throw SocketConnReset("recvfrom");
}
if(getError() == WSAEMSGSIZE)
{
len=size;
}
else
#endif
throw SocketError("recvfrom()");
}
return len;
}
/** \brief read the given number of bytes
*
* Read size bytes into the buffer. Wait until size Bytes are available
* data maight be lossed, if size is smaller then the incomming package.
* This situation will not be treated as an error.
*
* \param buf Pointer to the data buffer.
* \param size Maximum count of bytes to read.
* \param from Will be overwritten with the address of the sender
*
* \see Socket::recvAvailable Socket::recv
*/
int DgramSocket::recvFrom(void *buf,int size,Address &from)
{
int len;
SocketLenT addrLen=from.getSockAddrSize();
len=recvfrom(_sd,
(char*)buf,
size,
0,
from.getSockAddr(),
&addrLen);
if(len<0)
{
#if defined WIN32
if(getError()==WSAECONNRESET)
{
throw SocketConnReset("recvfrom");
}
if(getError()==WSAEMSGSIZE)
{
len=size;
}
else
#endif
throw SocketError("recvfrom()");
}
return len;
}
/*! Read size bytes into the buffer. Wait until size Bytes are available
data maight be lossed, if size is smaller then the incomming package.
This situation will not be treated as an error.
\see Socket::recvAvailable Socket::recv
*/
int DgramSocket::recvFrom(void *buf,int size,SocketAddress &from)
{
int len;
SocketLenT addrLen=from.getSockAddrSize();
#ifndef WIN32
do
{
#endif
len=recvfrom(_sd,
static_cast<char *>(buf),
size,
0,
from.getSockAddr(),
&addrLen);
#ifndef WIN32
}
while(len < 0 && errno == EAGAIN);
#endif
if(len < 0)
{
#if defined WIN32
if(getError() == WSAECONNRESET)
{
throw SocketConnReset("recvfrom");
}
if(getError() == WSAEMSGSIZE)
{
len=size;
}
else
#endif
throw SocketError("recvfrom()");
}
return len;
}
