From mboxrd@z Thu Jan 1 00:00:00 1970 From: John Knottenbelt To: gnu-win32@cygnus.com Subject: Asynchronous I/O and SIGIO Date: Mon, 27 Jul 1998 04:08:00 -0000 Message-id: X-SW-Source: 1998-07/msg00577.html 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 - For help on using this list (especially unsubscribing), send a message to "gnu-win32-request@cygnus.com" with one line of text: "help".