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From:	tvonderhaar <tlvonderhaar AT gmail DOT com>
To:	"cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
Subject:	SIGIO using UDP sockets just hangs (permantely blocks) socket I/O.
Date:	Sat, 30 Sep 2017 11:50:59 +0000
Message-Id:	<embecdb725-8b17-4963-84ed-12e570da7532@str-c>
Reply-To:	tvonderhaar <tlvonderhaar AT gmail DOT com>
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     Dear cygwin_list,

     I have tried to get signals working with UDP bound sockets. I have
tried every combination and order of the included code, but once I
ioctl() the socket with "FIOASYNC" I get one signal from the socket and
the previously "FNDELAY" set socket blocks forever on a call to
recvfrom(). I can detect the block with a select, but it never becomes
ready. This code works flawlessly on Linux and in the past worked on
SUN,HP- UX(I remove the HP specific code) and Alpha OSes. If I don't
perform the ioctl() with "FIOASYNC" or perform a second call to ioctl()
with the "set_state=3D0" the socket does not block as expected, but I of
course I don't get my SIGIO signal. Note: I make the call to the
function as follows:

    set_io_async(udp_socket_fd,call_back,SIGIO,FALSE);
   /*FASLE defined as '0' and SIGIO as defined by CYGWIN.*/

  I only found one google search of an individual attempting non-blocking
asynchronous() I/O and they indicated it worked using this code sequence
under CYGWIN. "FASYNC" has no affect on CYGWIN using fcntl() as after
setting that flag with "F_SETFL" and reading the flags back with
"F_GETFL" the flag is not set.

     Some help would be appreciated. I know some feel signals are
obsolete but I don't and I have used them over for 20+ years. Thanks.

       Tom

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