Subj : Serial port query
To   : Vitus Jensen
From : Darin McBride
Date : Fri Aug 11 2000 01:29 pm

Hello Vitus!

Replying to a message of Vitus Jensen to Darin McBride:

 VJ>>> Get OS2UNDOC from hobbes and have a look at the DosQuerySysState
 VJ>>> API.  It will return infos about all open files of a single or all
 VJ>>> processes.  There are problems when using it at certain fixpak
 VJ>>> levels (older Warp 3 fixpaks).

 DM>> Of course!  I forgot all about that.  I already use that call for a
 DM>> number of things, so one more is no biggie.  :-)  Unfortunately, I
 DM>> can't figure out how to trace back from the file to the process(es). 

 VJ> Use the brute force method?  See below.

[...]

 VJ> There is this lees-than-optimal solution but why not use it:

 VJ> get a list of all running processes via DosQuerySysState
 VJ> for every process ID
 VJ>   get a list of all open files via DosQuerySysState
 VJ>   for every open file
 VJ>     check whether filename = COMx
 VJ>     if identical 
 VJ>       dump process info (DosQuerySysState)

 VJ> I don't think it would be too slow to be usable.

Of course - didn't think of that.  However, I've found what may work a bit 
better, if I can decipher everything.  The Warp4.5 toolkit *has* 
DosQuerySysState somewhat documented, and some of its structures are a bit 
bigger than what OS2UNDOC has.  Unfortunately, I don't have that toolkit at 
home... :-/

Darin

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 * Origin: Tanktalus' Tower BBS (1:250/102)

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