Fixed, thanks! Simon
On 09 August 2005 20:45, Adam Sampson wrote: > While writing a testcase for another bug (details to follow), I found > that System.Posix.IO.queryFdOption doesn't work. > > The problem appears to be that queryFdOption uses testBit incorrectly; > it assumes the second argument is the bitmask, when it's actually the > bit *position* to test. It should be an easy fix (just do a bitwise > AND and see whether the result's zero instead). > > Here's how to reproduce the problem on my system -- note that it's > getting the correct results from the underlying system calls, but not > returning them correctly: > > $ ghc --version > The Glorious Glasgow Haskell Compilation System, version 6.4 > $ uname -a > Linux cartman.at.fivegeeks.net 2.6.12.2 #1 Thu Jul 14 15:28:07 BST > 2005 i686 unknown unknown GNU/Linux > $ gcc -v > Reading specs from > /opt/packages/gcc-3.4.4/bin/../lib/gcc/i686-pc-linux-gnu/3.4.4/specs > Configured with: ./configure --prefix=/opt --sysconfdir=/etc > --localstatedir=/var --sharedstatedir=/var/com --enable-__cxa_atexit > --enable-threads=posix --enable-shared > --enable-languages=c,c++,java,f77,objc > Thread model: posix > gcc version 3.4.4 > $ cat Query.hs > import System.Posix.IO > > showNBR = do > v <- System.Posix.IO.queryFdOption 0 > System.Posix.IO.NonBlockingRead > putStr $ "NonBlockingRead = " ++ (show v) ++ "\n" > > main = do > showNBR > System.Posix.IO.setFdOption 0 System.Posix.IO.NonBlockingRead > True > showNBR > $ ghc -o query -package unix Query.hs > $ ./query > NonBlockingRead = False > NonBlockingRead = False > $ strace ./query 2>&1 | grep ETFL > [...] > fcntl64(0, F_GETFL) = 0x2 (flags O_RDWR) > fcntl64(0, F_SETFL, O_RDWR|O_NONBLOCK) = 0 > fcntl64(0, F_GETFL) = 0x802 (flags > O_RDWR|O_NONBLOCK) [...] > > If you need any more information, please let me know. > > Thanks, _______________________________________________ Glasgow-haskell-bugs mailing list Glasgow-haskell-bugs@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs
