[GRASS-dev] Re: [GRASS-user] 6.4 vs 7.0

[Glynn Clements]

Hamish wrote:

> > That's not good for the GUI, where the module won't have a
> > stdin (ideally, it will have been closed; if not, the module
> > will hang, waiting to read from whatever its stdin happens
> > to be).
> 
> does isatty(0) work on ms windows?

Yes. But only the Windows console is a TTY, MSys' rxvt isn't (which is
why e.g. tclsh and python don't work as expected there).

Windows doesn't appear to have anything similar to ptys.

> does it work from a pipe?

A pipe isn't considered a TTY on any platform.

isatty() is frequently misused. It can be a useful heuristic to
determine whether the program is being run interactively, but (as with
most heuristics), there should be a way for the user to override it.

The only situation where behaviour should depend solely upon the
result of isatty() is if you need to rely upon TTY-specific
functionality, e.g. tcsettattr().

-- 
Glynn Clements <glynn at gclements.plus.com>