id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	os	architecture	failure	difficulty	testcase	blockedby	blocking	related
3317	Ctrl-C is not received during a call to runProcess	judah	igloo	"The following program runs `cat` as an external process, and tries to kill it if an exception such as ctrl-c is received.

{{{
module Main where

import System.Process
import Control.Exception (finally)

main = do
    pid <- runProcess ""cat"" [] Nothing Nothing Nothing Nothing Nothing
    waitForProcess pid `finally` do
        putStrLn ""killing""
        terminateProcess pid
    print ""Done!""
}}}
With ghc-6.8.3, the subprocess is killed when ctrl-c is pressed.  However, with ghc-6.10.3 the program acts oddly:

{{{
$ ./raw 
^C^C
$ cat: stdin: Input/output error

}}}

The first time that ctrl-c is pressed, it is ignored.  The second time, it kills the program (without calling the handler set by `finally`) but the cat program is still running.

I ran into this bug because it makes custom Cabal `Setup.hs` scripts unkillable by ctrl-c."	merge	closed	normal	6.10.4	libraries/process	6.10.3	fixed			MacOS X	x86		Unknown