dag@chinet.UUCP (Daniel A. Glasser) (04/26/88)
I believe that some of the confusion here stems from the Abucus Internals
book (first edition, I don't have the second edition) which not only has a
description which is incomprehensable, but uses a different name than most
other docs. The name they give it is SETBLOCK... The function should not
be compiler specific if the compiler package offers bios/xbios/gemdos calls.
The Mark Williams C package does it with macros in the file osbind.h, the
Lattice C package uses functions in the library (since they use a 32 bit
'int' and TOS uses 16 bit ints...)
Mshrink() takes two parameters, the first is a pointer to the beginning of
a block of memory that has been allocated by a call to Malloc() (this includes
the basepage/TPA of a program in memory) and the second parameter is a long
containing the number of bytes to be freed. Mshrink() is a GEMDOS function
and has function code 74.
*WARNING***WARNING***WARNING***WARNING***WARNING***WARNING***WARNING***WARNING*
* DO NOT CALL MSHRINK WITH THE FIRST PARAMETER POINTING TO ANYTHING EXCEPT *
* THE BEGINNING OF A BLOCK ALLOCATED WITH THE *GEMDOS* Malloc FUNCTION OR THE *
* BASEPAGE OF A PROCESS IN MEMORY! (Pexec() does an Malloc()) THE SYSTEM *
* WILL VERY LIKELY GO BERZERK! *
*WARNING***WARNING***WARNING***WARNING***WARNING***WARNING***WARNING***WARNING*
--
Daniel A. Glasser dag@chinet.UUCP
One of those things that goes "BUMP!!! (ouch!)" in the night.
...!att-ih!chinet!dag | ...!ihnp4!mwc!dag | ...!ihnp4!mwc!gorgon!dagapratt@atari.UUCP (Allan Pratt) (04/28/88)
From article <4983@chinet.UUCP>, by dag@chinet.UUCP (Daniel A. Glasser): > Mshrink() takes two parameters, the first is a pointer to the beginning > of a block of memory that has been allocated by a call to Malloc() (this > includes the basepage/TPA of a program in memory) and the second > parameter is a long containing the number of bytes to be freed. > Mshrink() is a GEMDOS function and has function code 74. Poor Dan Glasser has forgotten something: the macro Mshrink includes a dummy parameter, because the Gemdos call has an unused argument. #define Mshrink(base,newsize) gemdos(0x4a,0,base,newsize) Most macro files (including Atari's osbind.h) have this definition, but you have to know it's there if you're setting up your own bindings. This is a handy time to mention that the arguments to Fdatime are documented wrong: the correct call is: Fdatime(timebuf,handle,wflag) int *timebuf; /* pointer to two int's */ int handle; /* handle of file to change */ int wflag; /* 1 for write, 0 for read */ ============================================ Opinions expressed above do not necessarily -- Allan Pratt, Atari Corp. reflect those of Atari Corp. or anyone else. ...ames!atari!apratt
wes@obie.UUCP (Barnacle Wes) (05/01/88)
In article <1047@atari.UUCP>, apratt@atari.UUCP (Allan Pratt) writes:
% This is a handy time to mention that the arguments to Fdatime are
% documented wrong: the correct call is:
%
% Fdatime(timebuf,handle,wflag)
% int *timebuf; /* pointer to two int's */
% int handle; /* handle of file to change */
% int wflag; /* 1 for write, 0 for read */
For those of you with MWC, Fdatime is documented correctly there.
<grin, snicker, chuckle> :-) Of course, this includes all the new
registered developers, doesn't it?
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