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Re: Problems with trap handling?
- X-seq: zsh-workers 9512
- From: Peter Stephenson <pws@xxxxxxxxxxxxxxxxxxxxxxxx>
- To: zsh-workers@xxxxxxxxxxxxxx
- Subject: Re: Problems with trap handling?
- Date: Tue, 01 Feb 2000 18:45:18 +0000
- In-reply-to: "Sven Wischnowsky"'s message of "Mon, 31 Jan 2000 13:07:45 +0100." <200001311207.NAA01858@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>
- Mailing-list: contact zsh-workers-help@xxxxxxxxxxxxxx; run by ezmlm
Sven Wischnowsky wrote:
> Bart Schaefer wrote:
> > function tst() {
> > trap return INT
> > read -q xx'?Type ^C here: '
> > echo You should not see this.
> > }
> >
> > Execute in 3.1.6-dev-16 and type ^C. Note that you don't leave the "read"
> > prompt. Type any plain character; now "read" returns, and the function
> > aborts as if interrupted.
>
> In this incanartion read ends up in read1char() which explicitly does
> *not* stop if the read returns with errno==EINTR. So I guess someone
> had a reason for doing this way.
>
> We could either test retflag/breaks/contflag there or give it a flag
> that says to stop in case of EINTR and which would be set by bin_read
> (via getquery()).
I think the answer is it should be testing more flags at this point:
whatever's making the function return (i.e. retflag) should make the read
return, too. It's certainly correct that EINTR shouldn't make it return ---
the problem was that the query aborted if, say, a background job exited,
and as far as I can see the same issue applies to any call to read1char().
It's quite possible the same issue comes up at umpteen other places in the
code, alas.
--
Peter Stephenson <pws@xxxxxxxxxxxxxxxxxxxxxxxx>
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