On 6/7/2020 9:20 AM, Cary Lewis via Cygwin wrote:
These constants are usually defined in netinet/tcp.h but are not defined
anywhere in cygwin.
>
As a result there does not seem to be a way to enable the socket level keep
alives in cygwin.
One result of this is curl's --keepalive-time option does not work, but it
would affect any attempt to enable socket keep alives.
Windows' sockets do support keep alives, and indeed the win32 version of
curl works correctly.
Can someone explain why the TCP keep alive constants are not defined
I'm not an expert on sockets, but I'll just make a couple of comments until
Corinna has a chance to give a definitive reply.
Cygwin's netinet/tcp.h was derived from the FreeBSD version of the file dated
2000/01/09. It has hardly been touched since it was imported into Cygwin in
2002. FreeBSD didn't add keepalive support until 2012.
Is it possible to add this functionality?
If you're asking someone else to do it, the question is whether one of the
Cygwin developers has the time and expertise to do it. If you're volunteering
to do it, patches are always welcome.
Where in the cygwin source code does the actual posix socket to winsock
translation take place?
Cygwin's socket support is in the fhandler_socket* files.
Ken
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