bug#34488: Add sort --limit, or document workarounds for sort|head error messages

[Pádraig Brady]

On 18/02/19 01:46, Assaf Gordon wrote:
> Hello,
> 
> Thanks for all comments (on and off list).
> Attached an updated patch with documentation.
> 
> The supported options are:
> 
>   --default-signal[=SIG]  reset signal SIG to its default signal handler.
>                           without SIG, all known signals are included.
>                           multiple signals can be comma-separated.
>   --ignore-signal[=SIG]   set signal SIG to be IGNORED.
>                           without SIG, all known signals are included.
>                           multiple signals can be comma-separated.
>   -p                      same as --default-signal=PIPE
> 
> (lower-case "-p" as to not conflict with BSD, but of course can be
> changed to another letter).
> 
> The new 'env-signal-handler.sh' test passes on GNU/linux, non-gnu/linux
> (alpine), and Free/Open/Net BSD.
> 
> Comments very welcomed,

Attached is a patch to be squashed in to:

  Process the same signals as kill -l
  Output whether action failed or not
  Don't run sigaction(..set..) if get failed

I'm not that enthusiastic about the -p
since it treats PIPE specially here,
and it's not special from env's point of view.

cheers,
Pádraig

env-default-fixes.patch
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