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Re: signal-handling problems for "dd": some thoughts
From: |
Paul Jarc |
Subject: |
Re: signal-handling problems for "dd": some thoughts |
Date: |
Mon, 19 Apr 2004 10:31:57 -0400 |
User-agent: |
Gnus/5.110002 (No Gnus v0.2) Emacs/21.3 (gnu/linux) |
Jim Meyering <address@hidden> wrote:
> I suppose you're referring to this part of the POSIX spec:
>
> The signals SIGUSR1 and SIGUSR2 are commonly used by applications for
> notification of exceptional behavior and are described as ``reserved as
> application-defined'' so that such use is not prohibited.
This sounds to me like an explicit approval of dd's use of SIGUSR1.
> And so dd shouldn't use SIGUSR1, because some application (e.g., a
> program that invokes dd) might use SIGUSR1 for something unrelated.
You mean a program might send SIGUSR1 to other, unrelated programs
(and therefore not knowing how they handle it)? Sounds like a bug in
the killer.
> The ideal would be to find an approach that avoids adding a new option
> to each tool that supports a progress bar.
Environment variable?
paul