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devel / comp.os.os2.programmer.misc / Re: BSS

SubjectAuthor
* BSSPaul Edwards
+* Re: BSSPaul Edwards
|`- Re: BSSMarcel Mueller
`- Re: BSSMarcel Mueller

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From: mutazi...@gmail.com (Paul Edwards)
Newsgroups: comp.os.os2.programmer.misc
Subject: BSS
Date: Sat, 2 Mar 2024 13:56:58 +0800
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 by: Paul Edwards - Sat, 2 Mar 2024 05:56 UTC

Whose responsibility is it to clear BSS?

I assume it is the operating system.

I am now able to open and read/write files,
but during testing (on PDOS/386) I found an
issue which I believe is due to uninitialized BSS.

Thanks. Paul.

Re: BSS

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From: mutazi...@gmail.com (Paul Edwards)
Newsgroups: comp.os.os2.programmer.misc
Subject: Re: BSS
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In-Reply-To: <uruf3b$1o06i$1@dont-email.me>
 by: Paul Edwards - Sat, 2 Mar 2024 08:01 UTC

On 02/03/24 13:56, Paul Edwards wrote:
> Whose responsibility is it to clear BSS?
>
> I assume it is the operating system.
>
> I am now able to open and read/write files,
> but during testing (on PDOS/386) I found an
> issue which I believe is due to uninitialized BSS.

I changed malloc to calloc in exeload.c and
the problem was resolved. I didn't notice a
specific BSS section in the LX header so will
leave any refining of that to another day.

My theory of how I could get files working
for DOSCALLS appears to be correct - I can
indeed turn them around back into FILE accesses,
except if the handle is less than 3. Quite
neat result for 200 lines of code so far.

I will defer fleshing out DosDevIOCtl in terms
of setvbuf plus others until some other things
are resolved (bug reports, compiler, pdld,
microemacs makefile).

New pdos.zip etc uploaded.

BFN. Paul.

Re: BSS

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From: news.5.m...@spamgourmet.org (Marcel Mueller)
Newsgroups: comp.os.os2.programmer.misc
Subject: Re: BSS
Date: Mon, 4 Mar 2024 19:29:02 +0100
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In-Reply-To: <uruf3b$1o06i$1@dont-email.me>
 by: Marcel Mueller - Mon, 4 Mar 2024 18:29 UTC

Am 02.03.24 um 06:56 schrieb Paul Edwards:
> Whose responsibility is it to clear BSS?
>
> I assume it is the operating system.

Yes. More accurately the operating system initializes memory before it
is mapped into a different process. Otherwise one could simply allocate
memory and read from it to get information from other processes or even
kernel mode code.

> I am now able to open and read/write files,
> but during testing (on PDOS/386) I found an
> issue which I believe is due to uninitialized BSS.

OS/2 and modern operating systems clear the memory. DOS does not clear
anything. And in the C language reading from memory that has not been
written before is undefined behavior.

Marcel

Re: BSS

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From: news.5.m...@spamgourmet.org (Marcel Mueller)
Newsgroups: comp.os.os2.programmer.misc
Subject: Re: BSS
Date: Mon, 4 Mar 2024 19:32:25 +0100
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In-Reply-To: <urumcf$1p9kd$1@dont-email.me>
 by: Marcel Mueller - Mon, 4 Mar 2024 18:32 UTC

Am 02.03.24 um 09:01 schrieb Paul Edwards:
> I changed malloc to calloc in exeload.c and
> the problem was resolved. I didn't notice a
> specific BSS section in the LX header so will
> leave any refining of that to another day.

This is another story. malloc does not clear memory.
Even when the operating system clears memory before it is mapped into a
process malloc may still return dirty memory that has been used by the
same process before when free has been called.

Marcel

devel / comp.os.os2.programmer.misc / Re: BSS

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