Subj : DosRead - access denied?
To : Francois Thunus
From : Vitus Jensen
Date : Tue Jun 13 2000 06:50 pm
Moin Francois,
13.06.00 07:27, Francois Thunus wrote a message to Vitus Jensen:
VJ>> Could someone name any reason why a DosRead() from a serial port
VJ>> will return error code 5 (access denied) ? It's listed as
VJ>> possible error code but i would connect it with DosOpen().
FT> The only reason I could imagine is that some other program is
FT> accessing the port at the same time and that for some reason OS/2
FT> cannot handle the priorities between the two programs fighting
FT> for the com port.
I'm doing DosOpen() with OPEN_SHARE_DENYREADWRITE so there *should* be no other
process acessing the port. Theoretically.
FT> If you did not have access to the com port at all (for example my
FT> dos boxes by default do not have access to all com ports), the
FT> DosOpen() would fail first, so you would never reach the
FT> DosRead() stage (if my understanding is correct).
That's the same understanding I have about this matter. But in real life we
have:
1. error 5 is listed in DosRead() docu and
2. there is at least one machine where it is returned.
FT> It would be helpful if the person who has the problem can give
FT> you a list of all other programs running at the same time,
FT> specially those susceptible of accessing the com port.
In the meantime he fixed the error in his driver w/o running the testprogram.
So I'm happy with the result even if I wonder. But it's an idea to ask him for
a pstat /C result. We will see what this gives...
FT> Disclaimer - These opiini^H^H damn! ^H^H ^Q ^[ .... :w
FT> :q :wq :wq! ^d X ^? exit X Q ^C ^? :quitbye CtrlAltDel ~~q
FT> :~q logout save/quit :!QUIT ^[zz ^[ZZZZZZ ^H man vi ^ ^L
FT> ^[c ^# ^E ^X ^I ^T ? help helpquit ^D ^d man help ^C
FT> ^c help ?Quit ?q CtrlShftDel"Hey, what does this button d...
Great!
C-x C-s,
Vitus
--- Sqed/rexx 489:
* Origin: See the Future; See OS/2. Be the Future; Run OS/2. (2:2474/424.1)
