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Date: Tue, 11 Jan 2011 04:27:50 +0100
Message-ID: <AANLkTi=ZzYr4RPVSME=3B3YSnd2G_tvYaG9G8=Xz5R4c@mail.gmail.com>
Subject: Re: 4.3.11 TRAPEXIT() on cygwin
From: Mikael Magnusson <mikachu@gmail.com>
To: Anthony Heading <anthony@ajrh.net>
Cc: zsh-workers@zsh.org
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On 11 January 2011 04:25, Mikael Magnusson <mikachu@gmail.com> wrote:
>>    When a subshell is entered, traps that are not being ignored shall
>>    be set to the default actions, except in the case of a command
>>    substitution containing only a single trap command, when the traps
>>    need not be altered.
>
> Ah, the manpage says this
>       ( list )
>              Execute  list  in a subshell.  Traps set by the trap
> builtin are reset
>              to their default values while executing list.
>
> and it is true:
> % trap 'echo hello >&2' EXIT
> % a=3D$(ls)
> % TRAPEXIT() { echo function hello >&2 }
> % a=3D$(ls)
> function hello

One might take issue with this statement in the manpage though,

The  functions  beginning  `TRAP'  may alternatively be defined with the tr=
ap
builtin:  this may be preferable for some uses, as they are then run  in  t=
he
environment  of  the calling process, rather than in their own function env=
i=E2=80=90
ronment.  Apart from the difference in calling procedure and  the  fact  th=
at
the function form appears in lists of functions, the forms

              TRAPNAL() {
               # code
              }

       and

              trap '
               # code
              ' NAL

       are equivalent.


--=20
Mikael Magnusson