getsockopt(SO_KEEPALIVE) returns incorrect option length

[Pavel Holejsovsky]

Hi,

I think that following problem shows problematic behavior in cygwin 
1.7.5, at least incompatible with linux:

#include <stdio.h>
#include <sys/socket.h>

int main() {
         int sock, option, optlen = sizeof(int);
         sock = socket(AF_INET, SOCK_STREAM, 0);
         getsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, &option, &optlen);
         printf("option=%d, optlen=%d\n", option, optlen);
         return 0;
}

Prints optlen=1, while it is expected to be sizeof(int), i.e. 4.

This is most probably because uinderlying winsock call has this 
(mis)behavior, but I think that in cygwin layer this could be worked 
around to be more unix compatible.

This issue is relevant:

SO_KEEPALIVE value is actually a char on Windows, not BOOL
https://bugzilla.gnome.org/show_bug.cgi?id=611756

And causes glib gio 2.24 to fail certain socket operations on cygwin.

thanks,
Pavel
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