< SIO_ROUTING_INTERFACE_QUERY, SO_ACCEPTCONN & SO_BROADCAST Examples | Socket Options & IOCTLs Main | Chap 8: Name Registration & Resolution >
Socket Options and Ioctls 7 part 10
What do we have in this chapter 7 part 10?
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The SO_MAX_MSG_SIZE Option Program Example
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The SO_PROTOCOL_INFO Option Program Example
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The SO_RCVTIMEO Option Program Example
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The SO_TYPE Option Program Example
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The SO_MAX_MSG_SIZE Option Program Example
Create a new empty Win32 console mode application and add the project/solution name.
Add the following source code.
// Description: // This is a very short sample that simply calls the // SO_MAX_MSG_SIZE option to determine the largest datagram size possible. // // No command line arguments |
//
// Link to ws2_32.lib
#include <winsock2.h>
#include <ws2tcpip.h>
#include <stdio.h>
// Function: main
// Description: Load Winsock, creat a UDP socket, and then call the option. Print the results.
int main(int argc, char **argv)
{
WSADATA wsd;
SOCKET s;
int iSize, iVal, ret;
// Load Winsock
if (WSAStartup(MAKEWORD(2,2), &wsd) != 0)
{
printf("WSAStartup() failed with error code %d\n", WSAGetLastError());
return -1;
}
else
printf("WSAStartup() is fine!\n");
// Create a UDP socket
s = WSASocket(AF_INET, SOCK_DGRAM, IPPROTO_UDP, NULL, 0, WSA_FLAG_OVERLAPPED);
if (s == INVALID_SOCKET)
{
printf("WSASocket() failed with error code %d\n", WSAGetLastError());
return -1;
}
else
printf("WSASocket() should be OK!\n");
// Retrieve the option and print the result
iSize = sizeof(iVal);
ret = getsockopt(s, SOL_SOCKET, SO_MAX_MSG_SIZE, (char *)&iVal, &iSize);
if (ret == SOCKET_ERROR)
{
printf("getsockopt(SO_MAX_MSG_SIZE) failed with error code %d\n", WSAGetLastError());
return -1;
}
else
printf("getsockopt(SO_MAX_MSG_SIZE) is pretty good!\n");
printf("\nThe max message size = %d\n\n", iVal);
if(closesocket(s) == 0)
printf("closesocket() should be fine!\n");
else
printf("closesocket() failed with error code %d\n", WSAGetLastError());
if(WSACleanup() == 0)
printf("WSACleanup() is OK!\n");
else
printf("WSACleanup() failed with error code %d\n", WSAGetLastError());
return 0;
}
Build and run the project.
The SO_PROTOCOL_INFO Option Program Example
Create a new empty Win32 console mode application and add the project/solution name.
Add the following code.
// Description:
// This short sample illustrates how to call the SO_PROTOCOL_INFO
// option to retrieve the Winsock catalog entry corresponding
// to the socket. This function only shows how to call the option
// and does not print out the whole WSAPROTOCOL_INFO structure.
//
// No command line arguments
//
// Link to ws2_32.lib
#include <winsock2.h>
#include <ws2tcpip.h>
#include <stdio.h>
// Function: main
// Description:
// Load Winsock, create a socket, and call SO_PROTOCOL_INFO to
// retrieve the catalog entry corresponding to our socket.
int main(int argc, char **argv)
{
WSADATA wsd;
SOCKET s;
WSAPROTOCOL_INFOA pinf;
int iSize,ret;
// Load Winsock
if (WSAStartup(MAKEWORD(2,2), &wsd) != 0)
{
printf("WSAStartup() failed with error code %d\n", WSAGetLastError());
return -1;
}
else
printf("WSAStartup() should be OK!\n");
// Create our TCP socket
s = WSASocket(AF_INET, SOCK_STREAM, IPPROTO_TCP, NULL, 0, WSA_FLAG_OVERLAPPED);
if (s == INVALID_SOCKET)
{
printf("WSASocket() failed with error code %d\n", WSAGetLastError());
return -1;
}
else
printf("WSASocket() is OK!\n");
// Get the protocol information. You can either use WSA_PROTOCOL_INFO
// or SO_PROTOCOL_INFOA since we didn't #define UNICODE.
iSize = sizeof(pinf);
ZeroMemory(&pinf, iSize);
ret = getsockopt(s, SOL_SOCKET, SO_PROTOCOL_INFOA, (char *)&pinf, &iSize);
if (ret == SOCKET_ERROR)
{
printf("getsockopt(SO_PROTOCOL_INFO) failed with error code %d\n", WSAGetLastError());
return -1;
}
else
printf("getsockopt(SO_PROTOCOL_INFO) should be OK!\n");
// Print a couple fields out
printf("\nProtocol: [%s]\n", pinf.szProtocol);
printf("Flags: 0x%x\n\n", pinf.dwServiceFlags1);
if(closesocket(s) == 0)
printf("closesocket() should be fine!\n");
else
printf("closesocket() failed with error code %d\n", WSAGetLastError());
if(WSACleanup() == 0)
printf("WSACleanup() is OK!\n");
else
printf("WSACleanup() failed with error code %d\n", WSAGetLastError());
return 0;
}
Build and run the project.
--------------------------------------------------------------------
The SO_RCVTIMEO Option Program Example
Create a new empty Win32 console mode application and add the project/solution name.
Add the following source code.
// Description:
// This is a trivial sample that sets the receive timeout
// option and then attempts to receive a datagram which will fail with a timeout message.
//
// No command line arguments
//
// Link to ws2_32.lib
#include <windows.h>
#include <winsock.h>
#include <stdio.h>
// Function: main
// Description:
// Load Winsock, create a UDP socket, set the timeout value,
// and then call recvfrom() will will fail with a timeout since no data is being sent.
int main(int argc, char **argv)
{
WSADATA wsd;
SOCKADDR_IN from;
SOCKET s;
int ret, iVal=0, fromsz;
unsigned int sz = sizeof(iVal);
char rcvbuf[1024];
// Load Winsock
if (WSAStartup(MAKEWORD(2,2), &wsd) != 0)
{
printf("WSAStartup() failed with error code %d\n", WSAGetLastError());
return -1;
}
else
printf("WSAStartup() should be OK!\n");
// Create a datagram socket
s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (s == INVALID_SOCKET)
{
printf("socket() failed with error code %d\n", WSAGetLastError());
return -1;
}
else
printf("socket() is OK!\n");
// Set the timeout value
iVal = 1000;
ret = setsockopt(s, SOL_SOCKET, SO_RCVTIMEO, (char *)&iVal, sz);
if (ret == SOCKET_ERROR)
{
printf("setsockopt() failed with error code %d\n", WSAGetLastError());
return -1;
}
else
printf("setsockopt() is OK!\n");
printf("Timeout was set...\n");
// Retrieve the value just to be sure
printf("Do a verification...\n");
ret = getsockopt(s, SOL_SOCKET, SO_RCVTIMEO, (char *)&iVal, &sz);
if (ret == SOCKET_ERROR)
{
printf("getsockopt() failed with error code %d\n", WSAGetLastError());
return -1;
}
else
printf("getsockopt() is fine!\n");
printf("Timeout value == %d\n", iVal);
// To test the receive function we need to bind first
from.sin_family = AF_INET;
from.sin_addr.s_addr = htonl(INADDR_ANY);
from.sin_port = htons(5150);
ret = bind(s, (SOCKADDR *)&from, sizeof(from));
if (ret == SOCKET_ERROR)
{
printf("bind() failed: %d\n", WSAGetLastError());
return -1;
}
// Call receive which will fail with WSAETIMEDOUT
fromsz = sizeof(from);
ret = recvfrom(s, rcvbuf, 1024, 0, (SOCKADDR *)&from, &fromsz);
if (ret == SOCKET_ERROR)
{
if (WSAGetLastError() == WSAETIMEDOUT)
printf("recvfrom() failed with error code 10060 (WSAETIMEDOUT)\n");
else
printf("recvfrom() failed with error code %d\n", WSAGetLastError());
}
else
printf("recvfrom() looks fine!\n");
if(closesocket(s) == 0)
printf("closesocket() should be fine!\n");
else
printf("closesocket() failed with error code %d\n", WSAGetLastError());
if(WSACleanup() == 0)
printf("WSACleanup() is OK!\n");
else
printf("WSACleanup() failed with error code %d\n", WSAGetLastError());
return 0;
}
Build and run the project.
The SO_TYPE Option Program Example
Create a new empty Win32 console mode application and add the project/solution name.
Add the following source code.
// Description:
// This sample creates a socket and then calls the SO_TYPE option
// to retrieve the socket type (SOCK_STREAM, SOCK_DGRAM, etc) for that socket.
//
// Command line arguments
//
// Link to ws2_32.lib
#include <winsock2.h>
#include <ws2tcpip.h>
#include <stdio.h>
// Function: main
// Description: Load Winsock, create a socket, and then call the SO_TYPE option and print the results.
int main(int argc, char **argv)
{
WSADATA wsd;
SOCKET s;
int ret, iVal, iSize;
// Load Winsock
if (WSAStartup(MAKEWORD(2,2), &wsd) != 0)
{
printf("WSAStartup() failed with error code %d\n", WSAGetLastError());
return -1;
}
else
printf("WSAStartup() should be fine!\n");
// In this case create a UDP SOCK_DGRAM socket
s = WSASocket(AF_INET, SOCK_DGRAM, IPPROTO_UDP, NULL, 0, WSA_FLAG_OVERLAPPED);
if (s == INVALID_SOCKET)
{
printf("WSASocket() failed with error code %d\n", WSAGetLastError());
return -1;
}
else
printf("WSASocket() is OK!\n");
// Retrieve the type and print its value
iSize = sizeof(iVal);
ret = getsockopt(s, SOL_SOCKET, SO_TYPE, (char *)&iVal, &iSize);
if (ret == SOCKET_ERROR)
{
printf("getsockopt(SO_TYPE) failed with error code %d\n", iVal);
return -1;
}
else
printf("getsockopt(SO_TYPE) is pretty fine!\n");
printf("Protocol type: ");
if (iVal == SOCK_STREAM)
printf("SOCK_STREAM\n");
else if (iVal == SOCK_DGRAM)
printf("SOCK_DGRAM\n");
else if (iVal == SOCK_RDM)
printf("SOCK_RDM\n");
else if (iVal == SOCK_SEQPACKET)
printf("SOCK_SEQPKACKET\n");
else if (iVal == SOCK_RAW)
printf("SOCK_RAW\n");
else
printf("Unknown\n");
// Clean-up
if(closesocket(s) == 0)
printf("closesocket() should be fine!\n");
else
printf("closesocket() failed with error code %d\n", WSAGetLastError());
if(WSACleanup() == 0)
printf("WSACleanup() is OK!\n");
else
printf("WSACleanup() failed with error code %d\n", WSAGetLastError());
return 0;
}
Build and run the project.
< SIO_ROUTING_INTERFACE_QUERY, SO_ACCEPTCONN & SO_BROADCAST Examples | Socket Options & IOCTLs Main | Chap 8: Name Registration & Resolution >