Re: [libmicrohttpd] Check for client disconnection on suspended connection

[Christian Grothoff]

On 7/29/19 6:28 PM, Robert D Kocisko wrote:
> Christian,
> 
>>  do whatever syscall you fancy to find out if the client disconnected.
> Do you mean something like recv(fd, buffer, sizeof(buffer), MSG_PEEK |
> MSG_DONTWAIT) 
> and check for it to return 0?

Yes. There might also be -1/errno combos to watch for.

> If so, once this returns 0
> is it safe to assume that I can resume the connection and it will
> disconnect without invoking my access handler callback?

It may still invoke your access handler callback, in fact if MHD is
still trying to *send*, that seems likely as MHD won't do recv() to
detect the client's disconnect state. However, in your callback, you
could simply return "MHD_NO" to force MHD to close down the connection
at that time.

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