[ ghc-Bugs-972909 ] Posix.popen is broken

Bugs item #972909, was opened at 2004-06-15 01:25
Message generated for change (Comment added) made by simonmar
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>Category: hslibs/posix
Group: None
>Status: Closed
Resolution: None
Priority: 3
Submitted By: Fergus Henderson (fergus)
Assigned to: Nobody/Anonymous (nobody)
Summary: Posix.popen is broken

Initial Comment:
Posix.popen hangs if the input is longer than 4096
characters.

For example, attempting to run the attached Haskell
source file will result in the program hanging.  The
program attempts
to use Posix.popen to invoke "cat" without 5000 blank
lines as input.

The problem is that it tries to write to the pipe
before forking.
If there are more than 4096 characters, this will block
until some process reads from the pipe.  But there's
only one process,
so it deadlocks.



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>Comment By: Simon Marlow (simonmar)
Date: 2005-02-15 12:50

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Posix.popen is deprecated, replaced by System.Process in 6.4.

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Comment By: Simon Marlow (simonmar)
Date: 2004-12-17 09:40

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Lowering priority; this library is subsumed by
System.Process in GHC 6.4.

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