* Asynchronous I/O and SIGIO
@ 1998-07-27 4:08 John Knottenbelt
0 siblings, 0 replies; only message in thread
From: John Knottenbelt @ 1998-07-27 4:08 UTC (permalink / raw)
To: gnu-win32
Hi
I've been trying to get asynchronous I/O going. I would like to be able to
receive SIGIO signals when a file descriptor becomes ready for reading or
writing.
I have had some success by performing an fcntl:
int flags = fcntl( fd, F_GETFL, 0 );
fcntl( fd, F_SETFL, flags | O_NONBLOCK | FASYNC );
and then subsequently an ioctl
int yesplease = 1;
ioctl( fd, FIOASYNC, &yesplease );
(I'll admit I don't really know what the argument to the FIOASYNC ioctl
has got to be :)) It seems the the FIOASYNC actually enables the SIGIO
signals.
I tried using the fcntl F_SETOWN, but that didn't seem to work at all.
Any way this seems to work quite well for sockets and gives me SIGIOs.
However, it does not give me a SIGIO when the other end of the socket is
closed, which is desirable.
I would also like to get some SIGIOs when standard input / output are
ready for reading/writing but the ioctl does not succeed on fd 0.
Has any one had similar experience or can offer any advice?
Thanks
Johnny
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