Re: SYS "XOS_Find",&80

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From	Martin <News04@avisoft.f9.co.uk>
Newsgroups	comp.sys.acorn.programmer
Subject	Re: SYS "XOS_Find",&80
Date	Tue, 30 Dec 2025 23:33:46 +0000 (GMT)
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In article <662a8a935c.Paul@phorefaux>,
   Paul Stewart <phorefaux@gmail.com> wrote:
> Hi all,

> Hoping someone can help point out my mistake.
> Issue with SYS"XOS_Find",&80.

> Using SYS "XOS_Find",&80 to create a file, which is working fine.
> Just trying to trap errors when it is unable to create the file.
> Before I create the file I am using OS_File 17 to check if it exists 
> first, which again is working okay.

> My bit of code is:
> SYS "XOS_Find",&80,fname$ TO fhandle%;flags%
> IF (flags% AND 1)<>0 SYS "OS_GenerateError",fhandle%

> If I then try an save to say a readonly ShareFS share, it generates 
> expected error:

> 30 Dec 22:16:12 100   Message  : Shared disc is read only at line
> 157

> This I can trap and program continues to function.

> If I try an save to Resources (yes I know it is readonly and nobody
> should be attempting to save to it, but just for completeness) I
> receive the following error:


> 30 Dec 22:08:05 100   Message  : Internal error: abort on
> instruction fetch at &2

> With this error the program dies directly after running SYS 
> "XOS_Find",&80,fname$ TO fhandle%;flags%

Using RISC OS 5.31 on a Titanium, I get the expected
  Error  : &00000113
  Message: The filing system Resources: is read only

Maybe an old bug in RISC OS 4.42?

-- 
Martin Avison 
Note that unfortunately this email address will become invalid
without notice if (when) any spam is received.

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Thread

SYS "XOS_Find",&80 Paul Stewart <phorefaux@gmail.com> - 2025-12-30 22:36 +0000
  Re: SYS "XOS_Find",&80 Martin <News04@avisoft.f9.co.uk> - 2025-12-30 23:33 +0000
    Re: SYS "XOS_Find",&80 Paul Stewart <phorefaux@gmail.com> - 2025-12-30 23:57 +0000
    Re: SYS "XOS_Find",&80 Paul Stewart <phorefaux@gmail.com> - 2025-12-31 13:16 +0000
      Re: SYS "XOS_Find",&80 Paul Stewart <phorefaux@gmail.com> - 2025-12-31 13:43 +0000

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