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Re: File locking within zsh?

X-seq: zsh-users 10246
From: Peter Stephenson <pws@xxxxxxx>
To: zsh-users@xxxxxxxxxx
Subject: Re: File locking within zsh?
Date: Thu, 11 May 2006 16:01:23 +0100
In-reply-to: <lt8xp8sko1.fsf@xxxxxxxxxxxxxxxxxx>
Mailing-list: contact zsh-users-help@xxxxxxxxxx; run by ezmlm
Organization: Cambridge Silicon Radio
References: <lt8xp8sko1.fsf@xxxxxxxxxxxxxxxxxx>

"Tim Writer" <tim@xxxxxxxxxxx> wrote:
> Okay. But I don't understand this:
> 
>     tim@ganesh% echo $ZSH_VERSION
>     4.2.5
>     tim@ganesh% echo $$; ( echo $$ )
>     18095
>     18095
>     tim@ganesh%

That's standard shell behaviour:  $$ is supposed to be unique to the parent
shell, not to every subshell instance.  You need tricks to get the actual
pid.  This will work on Linux:

zmodload -i zsh/stat
stat +link /proc/self

getpid() is another thing which could be added to the zsh/system module.

-- 
Peter Stephenson <pws@xxxxxxx>                  Software Engineer
CSR PLC, Churchill House, Cambridge Business Park, Cowley Road
Cambridge, CB4 0WZ, UK                          Tel: +44 (0)1223 692070

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Follow-Ups:
- Subshells and parameters (was: File locking within zsh?)
  - From: Vincent Lefevre
- Re: File locking within zsh?
  - From: Tim Writer

References:
- Re: File locking within zsh?
  - From: Tim Writer

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