How does one detect Control-C?
I know that it raises an Interrupt, but there are other things that are
also Interrupts (such as Timeout::Error). The documentation at
ruby-doc.org doesn’t list any details of class Interrupt, and the
“Programming Ruby” book at ruby-lang.org doesn’t even seem to mention
that class Interrupt exists.
Thanks.
William E. Rubin wrote:
How does one detect Control-C?
trap(“INT”){ … }
I know that it raises an Interrupt, but there are other things that are
also Interrupts (such as Timeout::Error). The documentation at
ruby-doc.org doesn’t list any details of class Interrupt, and the
“Programming Ruby” book at ruby-lang.org doesn’t even seem to mention
that class Interrupt exists.
Thanks.
Interrupt is a subclass of SignalException (which is a subclass of
Exception).
As far as I can tell (based on what I see in eval.c) it’s only used
for
trapping Unix signals*, i.e. whatever’s in your signal.h file.
Also, take a look at the Signal module.
Regards,
Dan
- Works on Windows too, though the implementation is different, and
likely
requires a separate sleeper thread.
On 12/8/05, William E. Rubin [email protected] wrote:
How does one detect Control-C?
I know that it raises an Interrupt, but there are other things that are
also Interrupts (such as Timeout::Error). The documentation at
ruby-doc.org doesn’t list any details of class Interrupt, and the
“Programming Ruby” book at ruby-lang.org doesn’t even seem to mention
that class Interrupt exists.
hump:[]:/home/mz652c% cat signal.rb
trap(“INT”) do
puts “got signal INT”
end
puts “Sup”
gets
hump:[]:/home/mz652c% ruby signal.rb
Sup
got signal INT
got signal INT
got signal INT
got signal INT
got signal INT
pressing ctrl-c generates ‘got signal INT’. Had to press ctrl-d to
exit the program.
On 12/8/05, Joe Van D. [email protected] wrote:
got signal INT
Interesting. When I ran the program above I get:
^Cgot signal INT
…
Any ideas on how to not get the ‘^C’ text?
On 12/9/05, Jim F. [email protected] wrote:
got signal INT
got signal INT
Interesting. When I ran the program above I get:
^Cgot signal INT
…
Any ideas on how to not get the ‘^C’ text?
Dunno, I didn’t get the ‘^C’ text. (on linux)
On Dec 9, 2005, at 8:50 AM, Jim F. wrote:
got signal INT
got signal INT
Interesting. When I ran the program above I get:
^Cgot signal INT
…
Any ideas on how to not get the ‘^C’ text?
The ^C is your ctrl-c being echoed by the
terminal device driver. You can use the stty
program to alter the behavior of the tty driver.
In particular, take a look at the -echoctl
option. In any case, the foreground process (ruby) doesn’t
see the ctrl-c because the tty driver discards
it and sends the Interrupt signal instead and then takes
car of echoing ‘^C’ back to the terminal itself.
The specific behavior may also depend on the particular
shell you are using.
Hope this helps.