Subj : DosRead - access denied?
To   : Vitus Jensen
From : Francois Thunus
Date : Tue Jun 13 2000 12:27 am

Hello Vitus!

12 Jun 00 20:05, Vitus Jensen wrote to all:

 VJ> Could someone name any reason why a DosRead() from a serial port will
 VJ> return error code 5 (access denied) ?  It's listed as possible error
 VJ> code but i would connect it with DosOpen().

The only reason I could imagine is that some other program is accessing the 
port at the same time and that for some reason OS/2 cannot handle the 
priorities between the two programs fighting for the com port.

If you did not have access to the com port at all (for example my dos boxes by 
default do not have access to all com ports), the DosOpen() would fail first, 
so you would never reach the DosRead() stage (if my understanding is correct).

It would be helpful if the person who has the problem can give you a list of 
all other programs running at the same time, specially those susceptible of 
accessing the com port.

                             -= Francois =-
                      Francois(at)telematique(dot)org
                       http://www.telematique.org/ft

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