runProcess hangs with duplicate handles
runProcess doesn't seem to allow the same handle to be
used for redirecting stdout and stderr. Thus,
main =
do
h <- openFile "output" WriteMode
ph <- runProcess "/bin/ls" [] Nothing Nothing
Nothing (Just h) (Just h)
waitForProcess ph
return ()
hangs in ghci and aborts with "thread blocked
indefinitely" if compiled. This isn't documented and
I hope this is not the intended behaviour as
redirecting stdout and stderr (and stdin in the case of
ptys) to the same file/pipe is quite common.
System is Linux 2.4.20-8 #1 Thu Mar 13 17:54:28 EST
2003 i686
ghc is vanilla 6.4
Trac metadata
Trac field |
Value |
Version |
6.4 |
Type |
Bug |
TypeOfFailure |
OtherFailure |
Priority |
normal |
Resolution |
ResolvedFixed |
Component |
libraries/base |
Test case |
|
Differential revisions |
|
BlockedBy |
|
Related |
|
Blocking |
|
CC |
|
Operating system |
|
Architecture |
|