Re: Testing if a Socket is Blocked or Non-Blocked

Scott,
In my program, I am issuing a number of reads to the socket, and while I
have set the socket to Non-Block, someone else calling the nbrecv procedure
may not do so, and end up in a wait on the first recv() if the socket is
not Non-Blocked.
Is there any down side to forcing the socket to be Non-Blocked if it is
already Non-Blocked?

Jeff Young
Sr. Programmer Analyst

On Thu, Sep 24, 2015 at 5:36 PM, Scott Klement <rpg400-l@xxxxxxxxxxxxxxxx>
wrote:

You can use fcntl() with F_GETFL to get the current socket flags. You can
then use %BITAND to test if the O_NONBLOCK flag is set.

flags = fcntl( fd: F_GETFL);
if %bitand( flags: O_NONBLOCK) <> 0;
// socket is in non-blocking mode
else;
// socket is in blocking mode
endif;

Having said that, I don't understand why it matters? If you want it in
non-blocking mode, just set it to non-blocking. why does it matter what it
used to be?



On 9/24/2015 1:39 PM, Jeff Young wrote:

All,
Using the information provided by Scott Klement and others here, I have
managed to get my socket programs work properly using Non-blocked sockets
and timeouts.
The only problem that I have is that I have to set the socket to
non-blocked in my main processing program before I issue the accept, read,
connect or write functions in non-blocked mode.
Is there any way to determine before executing the non-blocked functions
whether the socket has been set for non-blocked?


Jeff Young
Sr. Programmer Analyst

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