From:	"Jonathan Villani" <jonathan DOT villani AT videotron DOT ca>
Newsgroups:	comp.os.msdos.djgpp
Subject:	memcpy function or dosmemput(copying dpmi memory to DOS memory)
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Message-ID:	<11n22.1121$4S.4437@weber.videotron.net>
Date:	Wed, 11 Nov 1998 16:08:27 -0500
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To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp
Reply-To:	djgpp AT delorie DOT com

First I would like to thank Eli Zaretskii and Mark Reed  for helping me in
getting rid of the near pointers for
my sound player. Since it's the first time I'm allocating DOS memory under
DJGPP I have a lot of problems with finding the right function to do the
job. I've been told to use dosmemput but the syntax is:

dosmemput(const void *buffer,int length,int offset)

this transfer dpmi memory (sound samples allocated with malloc) to DOS
memory (DMA buffer)   right??

Ok if I am right about this tranfer, the const void *buffer sould be
replaced with my pointer to sound data (data allocated with malloc) But how
do I find the offset of the DMA buffer (DOS memory)

I know the formula : offset = segment * 16 + offset;
Do this code is right?

                           newoffset = info.rm_segment*16 + (offset where I
want to start the copy in my DOS memory)

Because in other codes I see that their using the memcpy function (Watcom
source code of SoundBlaster's Hardware programming guide). Do I need to use
memcpy or dosmemput ?


And  my second question is : can we lock DOS memory. I'm pretty sure that it
doesn't exist in DOS and it is for protected mode only but I want to be 100%
sure about that one. I don't want my program to hang the computer if it
swap.

Thank you very much!

Jonathan Villani
jonathan DOT villani AT videotron DOT ca

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