NetNews Offline 2/NetNews Offline Volume 2.iso/news/comp/sys/amiga/programmer/5558

Internet Message Format | 1996-08-05 | 1.7 KB

Path: news.ifm.liu.se!marcus
From: [e-mail] (Marcus Comstedt)
Newsgroups: comp.sys.amiga.programmer
Subject: Re: Waiting on >1 file
Date: 16 Mar 1996 18:33:03 GMT
Message-ID: <4if1gv$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: tina.lysator.liu.se
Mime-Version: 1.0
Content-Type: text/plain; charset=iso-8859-1
Content-Transfer-Encoding: 8bit
X-Newsreader: NN version 6.5.0 #24 (NOV)

[e-mail] (Irmen de Jong) writes:

>Say I have more than one file open. In my case all files are (virtual) console
>files, like CON: or AUX:. What I want to do is to wait on ALL these
>files simultaneously until one (or more) of them are ready to read, i.e.
>have input available. dos.library/WaitForChar() only works for one file,
>i need something like select() on sockets, but on files instead.

You'll have to create a MsgPort, and then post asynchronous ACTION_READ
or ACTION_WAIT_CHAR packets with dos.library/SendPkt() to all the file
handlers.  Then all you have to is exec.library/WaitPort() and check
which packets are returned.  (Using packets is a little bit hairy, but
this is the only way I know of...)

>Oh I tried the WaitSelect() from AmiTCP's bsdsocket.library but that
>beast only works on real sockets, not on normal file descriptors. *sigh*

Using the packet method, you can pass the MsgPort's SigBit to WaitSelect()
and wait on both files and sockets.  I do this in my port of TinyFugue.

--
--------------------------------------------------------------------------
Marcus Comstedt                          Lysator Academic Computer Society
[e-mail]                    Linko"ping University, Sweden  //
----------------------------------------------------------------------\X/-