[commit: process] master: document that readProcess throws an IOError exception if the process (68ba490)

[Simon Marlow]

Repository : ssh://darcs.haskell.org//srv/darcs/packages/process

On branch  : master

http://hackage.haskell.org/trac/ghc/changeset/68ba490d6691f55eab19a249379144831055e2ac

>---------------------------------------------------------------

commit 68ba490d6691f55eab19a249379144831055e2ac
Author: Simon Marlow <marlowsd at gmail.com>
Date:   Thu Aug 25 11:13:38 2011 +0100

    document that readProcess throws an IOError exception if the process
    exits with a non-zero exit code. (patch from Judah Jacobson on
    cvs-ghc)

>---------------------------------------------------------------

 System/Process.hs |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/System/Process.hs b/System/Process.hs
index bba4f52..6ae1ac5 100644
--- a/System/Process.hs
+++ b/System/Process.hs
@@ -342,6 +342,9 @@ waitForProcess ph = do
 -- Output is returned strictly, so this is not suitable for
 -- interactive applications.
 --
+-- This function throws an 'IOError' if the process 'ExitCode' is
+-- anything other than 'ExitSuccess'.
+--
 -- Users of this function should compile with @-threaded@ if they
 -- want other Haskell threads to keep running while waiting on
 -- the result of readProcess.