Re: [Iverilog-devel] automatically starting in noninteractive mode if standard input is not a terminal

[Martin W. <ic...@ma...>]

Lennert Buytenhek wrote:
> Hello!
> 
> I've been using the hack patch below to make Icarus Verilog
> automatically start in noninteractive mode when standard input is
> not a terminal.  This is useful when you're piping test data into a
> testbench and you don't want Ctrl-C to cause your terminal to be
> flooded with endless output like this:
> 
> 	$ ./gen | vvp ./detect
> 	[...]
> 	[1117850] 0   x x  x
> 	[1119450] 0   x x  x
> 	^C** VVP Stop(0) **
> 	** Flushing output streams.
> 	** Current simulation time is 1120750 ticks.
> 	> 0
> 	Unknown command: 0
> 	Try the help command to get a summary
> 	of available commands.
> 	> 0
> 	Unknown command: 0
> 	Try the help command to get a summary
> 	of available commands.
> 	> 0
> 	Unknown command: 0
> 	Try the help command to get a summary
> 	of available commands.
> 	> 0
> 	Unknown command: 0
> 	Try the help command to get a summary
> 	of available commands.
> 	[...]
> 
> Specifying -n by hand achieves the same thing, but there doesn't seem
> to be a legitimate reason to make Ctrl-C cause piped (noninteractive)
> input to be treated as commands if you don't explicitly pass in an
> option to prevent that from happening, IMHO.

I was about to agree with you, but then thought, what if someone piped in a 
set of commands they wanted to be executed when simulation stopped, i.e. 
some sort of semi-automatic debugging aid.

As "vvp -n" provides the behaviour you want, I'm inclined to leave well alone.