#3534: hSetBinaryMode fails after some input has been read
-----------------------------+----------------------------------------------
Reporter: judah | Owner:
Type: bug | Status: new
Priority: normal | Component: libraries/base
Version: 6.11 | Severity: normal
Keywords: | Testcase:
Os: Unknown/Multiple | Architecture: Unknown/Multiple
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For the following program (`BadSeek.hs`), type a couple characters of
input and press return. With ghc-6.10.3, it works fine; with ghc-6.11 it
throws an error.
{{{
module Main where
import System.IO
main = do
getChar >>= print
hSetBinaryMode stdin True
getChar >>= print
}}}
With ghc-6.10:
{{{
$ ./BadSeek
ab
'a'
'b'
}}}
With ghc-6.11:
{{{
$ ./BadSeek
ab
'a'
BadSeek: <stdin>: hSetBinaryMode: illegal operation (cannot flush the read
buffer of a text-mode handle)
}}}
The error goes away if the first 'getChar' is commented out.
For libraries which are not yet using the Unicode I/O layer, having a way
to temporarily set stdin to `BinaryMode` would be useful.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3534>
GHC <http://www.haskell.org/ghc/>
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