#724: tee complains if used in a process started by ghc
-------------------------------+--------------------------------------------
Reporter: guest | Owner:
Type: bug | Status: closed
Priority: high | Milestone: 6.6.2
Component: libraries/base | Version: 6.4.1
Severity: normal | Resolution: fixed
Keywords: | Difficulty: Moderate (1 day)
Os: Unknown | Testcase: concio001
Architecture: Unknown |
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Changes (by simonmar):
* resolution: => fixed
* testcase: => concio001
* status: new => closed
Comment:
Fixed, more or less.
{{{
Mon May 7 05:35:37 PDT 2007 Simon Marlow <[EMAIL PROTECTED]>
* FIX: #724 (tee complains if used in a process started by ghc)
Now, we only set O_NONBLOCK on file descriptors that we create
ourselves. File descriptors that we inherit (stdin, stdout, stderr)
are kept in blocking mode. The way we deal with this differs between
the threaded and non-threaded runtimes:
- with -threaded, we just make a safe foreign call to read(), which
may block, but this is ok.
- without -threaded, we test the descriptor with select() before
attempting any I/O. This isn't completely safe - someone else
might read the data between the select() and the read() - but it's
a reasonable compromise and doesn't seem to measurably affect
performance.
}}}
test cases to follow.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/724>
GHC <http://www.haskell.org/ghc/>
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