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Process-substitution FDs closed prematurely

From: Zev Weiss
Subject: Process-substitution FDs closed prematurely
Date: Tue, 6 Nov 2012 06:09:10 -0600

Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='x86_64' 
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='x86_64-unknow
uname output: Linux hatter.bewilderbeest.net 3.4.4-2-ARCH #1 SMP PREEMPT Sun 
Jun 24 18:59:47 CEST 2012 x86_64 GNU/Linux
Machine Type: x86_64-unknown-linux-gnu

Bash Version: 4.2
Patch Level: 39
Release Status: release


        It seems that when bash passes (the expanded form of) a
        process substitution to a function and that function then uses
        the argument in a pipeline, the file descriptor for the
        substituted pipe gets closed prematurely.  This does not occur
        with bash-4.1.11 on FreeBSD, but does with 4.2.39 on Linux (I
        attempted to compile 4.1.11 from source on Linux to test it,
        but the build failed).

        Shell transcript demonstrating it:

        address@hidden: tmp]% cat test.sh
        fn() { cat | cat "$1"; }
        fn <(:) < /dev/null
        address@hidden: tmp]% bash ./test.sh
        cat: /dev/fd/63: No such file or directory
        address@hidden: tmp]% echo $?

        Expected behavior is no output and an exit status of zero.

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