#1619: The RTS chokes on SIGPIPE (happens with runInteractiveCommand)
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Reporter: int-e | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: Runtime System | Version: 6.7
Severity: normal | Keywords:
Difficulty: Unknown | Os: Linux
Testcase: | Architecture: x86
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Consider the following code.
{{{
-- code based on example by steven_ashley on #haskell
import System.Process
import System.IO
import Control.Exception
main = do
data <- readFile "core"
(inp,out,err,pid) <- runInteractiveCommand "cat"
print "before"
finally (hPutStr inp data)
(print "after")
}}}
This program, when run with a large enough {{{core}}} file in the current
directory, will print {{{"before"}}} and then exit.
What happens (according to {{{strace}}}) is that the RTS closes the input
end of the output pipe of the {{{cat}}} process (the one associated with
the {{{out}}} variable). Then, {{{cat}}} tries to write some of its output
and gets killed by {{{SIGPIPE}}}. This in turn closes the input end of its
input pipe. When the Haskell program writes its next chunk of data, it is
killed by {{{SIGPIPE}}} itself.
I believe the right fix for this is for the RTS to ignore {{{SIGPIPE}}}.
The write syscall would then return {{{EPIPE}}} in the above scenario,
which can be handled by the normal exception mechanism.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1619>
GHC <http://www.haskell.org/ghc/>
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