[ ghc-Bugs-818932 ] Reading multiple files fails

Bugs item #818932, was opened at 2003-10-06 15:57
Message generated for change (Comment added) made by sigbjorn
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Category: None
Group: 6.0.1
>Status: Closed
>Resolution: Wont Fix
Priority: 5
Submitted By: Henk-Jan van Tuyl (hjvt)
Assigned to: Nobody/Anonymous (nobody)
Summary: Reading multiple files fails

Initial Comment:
The atttached zip file contains the file ReadALot.lhs, 
which reads a series of files (these files are listed 
in dir.dat). The program reads the first and the last 
(non-empty) line of each file and writes them, together 
with the filename in the output file result.dat.

The problem with the compiled program is, that the last 
lines are not really the last lines of the files; they 
are also not complete.

More info.:
This program is compiled under Windows 98, using the 
enclosed compile.bat. The stdout messages from the 
compiler can be found in compile.log; the stderr 
messages can not be redirected under Windows 98.
All files needed for running the program are in the 
attached file.


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>Comment By: Sigbjorn Finne (sigbjorn)
Date: 2003-10-07 08:44

Message:
Logged In: YES 
user_id=232905

Thanks for a fine report.

The input files are being closed prematurely. Have a look at 
semi-closed files in the Haskell Report.

To fix, either:
   
   - drop the use of hClose
   - define a custom forcing function that evaluates
      the result of reading an input file before closing
      it.


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