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DOS error code question

Started by"Ed" <invalid@nospam.com>
First post2013-04-19 21:28 +1000
Last post2013-04-19 22:54 +1000
Articles 3 — 2 participants

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  DOS error code question "Ed" <invalid@nospam.com> - 2013-04-19 21:28 +1000
    Re: DOS error code question Bogus@Embarq.com (Steve) - 2013-04-19 12:04 +0000
      Re: DOS error code question "Ed" <invalid@nospam.com> - 2013-04-19 22:54 +1000

#902 — DOS error code question

From"Ed" <invalid@nospam.com>
Date2013-04-19 21:28 +1000
SubjectDOS error code question
Message-ID<kkr9mm$mkj$1@speranza.aioe.org>
According to the MS-DOS docs, the following error codes
are generated when INT21 functions CREATE WRITE fail:

Int 21 3C CREAT - errors 3, 4, 5
Int 21 40 WRITE - errors 5, 6

So what happens when:
- there is no more directory space (CREAT)
- there are no more disk blocks (WRITE)

None of the codes above seem to cover this (?)  Does
DOS simply terminate the program?

Thanks.

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#903

FromBogus@Embarq.com (Steve)
Date2013-04-19 12:04 +0000
Message-ID<c1.2b8.3ZsbTL$04t@NOVOSAD3.EMBARQ.COM>
In reply to#902
Hi Ed,

"Ed" <invalid@nospam.com> writes:
>According to the MS-DOS docs, the following error codes
>are generated when INT21 functions CREATE WRITE fail:
>
>Int 21 3C CREAT - errors 3, 4, 5
>Int 21 40 WRITE - errors 5, 6
>
>So what happens when:
>- there is no more directory space (CREAT)

   You get error 5, ACCESS_DENIED (MS-DOS 5.0 Programmer's
Reference).

>- there are no more disk blocks (WRITE)
>

   You check register AX to find out how many bytes were actually
written (ibid).
   
>None of the codes above seem to cover this (?)  Does
>DOS simply terminate the program?

   No.  See above.

HTH,

Steve N.

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#904

From"Ed" <invalid@nospam.com>
Date2013-04-19 22:54 +1000
Message-ID<kkrenu$5gb$1@speranza.aioe.org>
In reply to#903
Steve wrote:
> Hi Ed,
>
> "Ed" <invalid@nospam.com> writes:
> >According to the MS-DOS docs, the following error codes
> >are generated when INT21 functions CREATE WRITE fail:
> >
> >Int 21 3C CREAT - errors 3, 4, 5
> >Int 21 40 WRITE - errors 5, 6
> >
> >So what happens when:
> >- there is no more directory space (CREAT)
>
>    You get error 5, ACCESS_DENIED (MS-DOS 5.0 Programmer's
> Reference).
>
> >- there are no more disk blocks (WRITE)
> >
>
>    You check register AX to find out how many bytes were actually
> written (ibid).
> ...

Thanks Steve.  I'm implementing DOS-style file handling on a
CP/M compiler and wanted to use the same error codes as DOS...

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