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Re: SIGPIPE not properly reset with 'trap - PIPE'


From: Andreas Schwab
Subject: Re: SIGPIPE not properly reset with 'trap - PIPE'
Date: Thu, 11 Dec 2008 10:13:18 +0100
User-agent: Gnus/5.110009 (No Gnus v0.9) Emacs/22.3 (gnu/linux)

Ralf Wildenhues <address@hidden> writes:

> I noticed the following bash bug when using gnulib-tool.  The script
> below outputs
>
> foo: line 20: echo: write error: Broken pipe
> foo: line 21: echo: write error: Broken pipe
>
> with bash 3.2.48(5)-release on GNU/Linux, whereas I think it should be
> silent.  Please note that the script assumes that GNU coreutils seq is
> installed.
>
> Please also note that the above errors occur also when
>   trap '' PIPE
>
> is used instead of 'trap - PIPE'.

You probably have SIGPIPE ignored when you start the script.  From
POSIX:

    Signals that were ignored on entry to a non-interactive shell cannot
    be trapped or reset, although no error need be reported when
    attempting to do so.

Andreas.

-- 
Andreas Schwab, SuSE Labs, address@hidden
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
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