Subj : Re: reentrant fwrite/fputc/etc ?
To   : borland.public.cpp.borlandcpp
From : "Ed Mulroy [TeamB]" <dont_email_me@bitbuc.ket>
Date : Fri Nov 14 2003 01:14 pm

No function which makes a call to DOS is stable for use in an ISR unless
specific, non-trivial efforts are made within the ISR itself to arrange for
the DOS call to work.  All of the FILE* I/O functions and most if not all of
the other file I/O functions (including the ones which write as a file to
stdout or stderr) use DOS calls.

If you need to do that I suggest that you get a book such as "Undocumented
DOS" and use the INDOS flag, an ISR reentrancy flag and stack switching to
arrange that it works.

..  Ed

> gary wrote in message
> news:3FB517F7.2040506@cordelli.net...
>
> this is why you need to be careful what C lib functions you
> call inside an ISR.

.