Show error message of Signal Events unsupported on Windows

[shigeki]

As discussed #1553, signal events are not yet supported on Windows.
The current error message of

process.on('SIGINT', function() {});

is shown on Windows as

C:\Users\ohtsu\Desktop\node\node>Release\node.exe test.js

node.js:197
        throw e; // process.nextTick error, or 'error' event on first tick
              ^
Error: No such module
    at EventEmitter.<anonymous> (node.js:388:27)
    at Object.<anonymous> (C:\Users\ohtsu\Desktop\node\node\test.js:1:71)
    at Module._compile (module.js:443:26)
    at Object..js (module.js:461:10)
    at Module.load (module.js:350:32)
    at Function._load (module.js:308:12)
    at Array.0 (module.js:481:10)
    at EventEmitter._tickCallback (node.js:188:41)

The error description of "No such module" is too ambiguous for users.
This patch shows it more clearly as

C:\Users\ohtsu\Desktop\shigeki>Release\node.exe test.js

node.js:197
        throw e; // process.nextTick error, or 'error' event on first tick
              ^
Error: Signal Event: SIGINT is not yet supported on Windows.
    at EventEmitter.<anonymous> (node.js:388:17)
    at Object.<anonymous> (C:\Users\ohtsu\Desktop\shigeki\test.js:1:71)
    at Module._compile (module.js:443:26)
    at Object..js (module.js:461:10)
    at Module.load (module.js:350:32)
    at Function._load (module.js:308:12)
    at Array.0 (module.js:481:10)
    at EventEmitter._tickCallback (node.js:188:41)

I also add notes on doc that signal events are not yet supported on Windows.

[Southern]

Should probably bold it to grab more attention. Had to put a couple of notes like this in readline's docs.

[shigeki]

Thanks for the comment. I change the doc description into the same as that in readline. I think that there's no actual workaround on this for simulating this with key events through stdin depends on the key assignments by user, so I did not add the additional notes on it.

[Southern]

If your program uses readline, you can always bind to readline.on('SIGINT', ...). Readline picks up ^C through stdin keypresses.

[shigeki]

I'm using the keypress event of Ctrl-c in stdin direcly. I agree that readline is the alternative.

[domenic]

+1, I believe this cryptic error message is what is preventing me from running the npm-www site on Windows.

[Nodejs-Jenkins]

Can one of the admins verify this patch?

[domenic]

Was this fixed with a test?

[chrisdickinson]

@domenic This was closed because node supports SIGINT & SIGHUP, as tested locally on windows xp with node v0.10.30. The docs also reflect this change as of 155df9c. All platforms throw an error when listening for SIGKILL. I did not track down the changeset that changed the behavior on Windows, though -- I can if you'd like!