[GRASS5] Re: [GRASSLIST:4315] Re: s.surf.rst output extent (wrap up)

[Glynn Clements]

Bernhard Reiter wrote:

> > a cross-post from grasslist:
> > Should we consider to force a chmod to write permission enabled for user
> > in case a map is set to read-only (example see below)?
> 
> We should add a permission check and issue a warning.

It's better to just improve the reporting of any errors which occur. 
IOW, if a system call fails, report the actual OS-level error using
perror or strerror(errno).

Trying to guess in advance whether a system call will succeed is very
difficult to get right[1]. It's a lot easier to just execute the
system call and report any errors.

[1] Actually, race conditions mean that it's impossible to get right.

> I'm not sure that forcing a permission is a good idea.

Agreed.

-- 
Glynn Clements <glynn.clements at virgin.net>