Mail Archives: cygwin/1999/11/19/07:24:05
Hello
I am trying to use a B20.1 select call to wait for a read event
on a socket, but the select never returns. This socket was created
by a DLL that is not mine.
The socket has a file descriptor value of a number greater than 63.
Hence when a use FD_SET to create the read mask for the select,
there aren't enough bits in the mask. The mask just remains as 0,0 ,
which is why the select doesn't return.
In sys/types.h I can see:
# define FD_SETSIZE 64
which is why my file descriptor values do not fit in an fd_mask.
I can also see the comment in this file:
"We don't define fd_set and friends if we are compiling POSIX
source, or if we have included the Windows Sockets.h header (which
defines Windows versions of them). Note that a program which
includes the Windows sockets.h header must know what it is doing;
it must not call the cygwin32 select function."
I am not including the Windows sockets.h header, nor does the
header file for the DLL include it. But presumably the DLL does
use winsock-allocated sockets. Do I gather that I can't use these
sockets with Cygwin select?
I am doing something wrong, or is there a way round this problem?
Many thanks
Peter Hudson
Telnet Research Ltd
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