Re: MinGW port usable

H. Peter Anvin wrote:

H. Peter Anvin wrote:

quoted

Except they are (for NT-based Windows), so you're doing something 
goofy.  This is a widely used construct, so it can't be that broken.

Erf... I dug through this, and it seems that WriteFile only works on a 
socket if it has an OVERLAPPED argument now, because the socket is 
opened for overlapping I/O.  This must be new behaviour in XP-SP2, 
because this definitely wasn't the case when I last played with this 
stuff back in 2003.  The Internet is full of people using this 
technique, but I haven't found a way to get a socket which is *not* 
opened for overlapping I/O.

How typical of Microsoft to break an incredibly powerful unified 
paradigm, sort-of repair it, and then break it again.  There doesn't 
seem to be an obvious way to repair this, either, since MS DLLs won't 
let you override for example the write() function as called from inside 
the C runtime DLL.

"Some people are just a total waste of carbon..."

**HAH***

I found a workaround after all.  The trick is to use WSASocket() with a 
last argument 0 instead of socket().

I feel dirty now...


#include <winsock2.h>
#include <fcntl.h>
#include <io.h>

#define socket(a,b,c) sane_socket(a,b,c)

int sane_socket(int domain, int type, int protocol)
{
	SOCKET s;
	int fd;

	s = WSASocket(domain, type, protocol, NULL, 0, 0);
	if (s == INVALID_SOCKET) {
		/*
		 * WSAGetLastError() values seem to be mostly
		 * errno+10000; verify this or replace this with
		 * a switch statement...
		 */
		errno = WSAGetLastError() - 10000;
		return -1;
	}
	
	fd = _open_osfhandle(s, 0);
	if (fd < 0)
		closesocket(s);

	return fd;
}