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and subject line Bug#320036: bash exits 0 on errors reading stdin (and perhaps
other scripts) (forwarded from Ian Jackson)
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From: Ian Jackson <[EMAIL PROTECTED]>
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Date: Tue, 26 Jul 2005 16:34:56 +0100
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Subject: bash exits 0 on errors reading stdin (and perhaps other scripts)
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Package: bash
Version: 2.05a-11
Severity: grave
chiark:~> bash 0>/dev/null
chiark:~> echo $?
0
chiark:~> strace bash 0>/dev/null 2>&1 | egrep '^read\(0|^_?exit'
read(0, 0x80cadb0, 1) = -1 EBADF (Bad file descriptor)
_exit(0) = ?
chiark:~> dpkg -s bash
Package: bash
Essential: yes
Status: install ok installed
Priority: required
Section: base
Installed-Size: 872
Maintainer: Matthias Klose <[EMAIL PROTECTED]>
Version: 2.05a-11
Replaces: bash-doc (<= 2.05-1), bash-completion
Depends: base-files (>= 2.1.12)
Pre-Depends: libc6 (>= 2.2.4-4), libncurses5 (>= 5.2.20020112a-1)
Conflicts: bash-completion
Conffiles:
/etc/bash.bashrc e218a2979b01db4e9c3ae19c94294a57
/etc/bash_completion 5769c2f29cbbc0bde1cf2996ec6231ec
/etc/skel/.bash_profile d8e9ecd0b80102c82966a045544bbf68
/etc/skel/.bashrc e9d2739d6f3d7672222c07d901d46e21
Description: The GNU Bourne Again SHell
Bash is an sh-compatible command language interpreter that executes
commands read from the standard input or from a file. Bash also
incorporates useful features from the Korn and C shells (ksh and csh).
.
Bash is ultimately intended to be a conformant implementation of the
IEEE POSIX Shell and Tools specification (IEEE Working Group 1003.2).
chiark:~> type bash
bash is hashed (/bin/bash)
chiark:~>
I have also reproduced this with bash 2.05b-2-26, and in the latter
case managed to prove to myself that it does the same with EIO.
This lack of proper error handling might easily cause data loss, as a
script might exit 0 when it hasn't done its work.
Ian.
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Thu, 18 Aug 2005 13:05:10 +0200 (MEST)
From: Matthias Klose <[EMAIL PROTECTED]>
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Date: Thu, 18 Aug 2005 13:05:10 +0200
To: [EMAIL PROTECTED], [EMAIL PROTECTED]
Cc: Ian Jackson <[EMAIL PROTECTED]>
Subject: Re: Bug#320036: bash exits 0 on errors reading stdin (and perhaps
other scripts) (forwarded from Ian Jackson)
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Chet Ramey writes:
> Matthias Klose wrote:
> >
> > ------------------------------------------------------------------------
> >
> > Subject:
> > Bug#320036: bash exits 0 on errors reading stdin (and perhaps other scripts)
>
> No shell behaves as the submitter describes. Read errors are translated
> to EOF, and the shell exits. The exit value is $?, which is changed by
> the last command (pipeline) executed or by a signal.
closing the report.
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