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Re: Bug#303623: [andrew@xxxxxxxxxxx: Bug#303623: zsh: CHECK_JOBS doesn't work when only one command was run since last Control-D]
- X-seq: zsh-workers 21130
- From: Andrew Pimlott <andrew@xxxxxxxxxxx>
- To: Bart Schaefer <schaefer@xxxxxxxxxxxxxxxx>
- Subject: Re: Bug#303623: [andrew@xxxxxxxxxxx: Bug#303623: zsh: CHECK_JOBS doesn't work when only one command was run since last Control-D]
- Date: Sat, 9 Apr 2005 21:23:22 -0700
- Cc: 303623-quiet@xxxxxxxxxxxxxxx, zsh-workers@xxxxxxxxxx
- In-reply-to: <1050410014930.ZM20382@xxxxxxxxxxxxxxxxxxxxxxx>
- Mailing-list: contact zsh-workers-help@xxxxxxxxxx; run by ezmlm
- References: <20050407191059.GA11437@xxxxxxxxxxx> <1050408000543.ZM18067@xxxxxxxxxxxxxxxxxxxxxxx> <20050409234700.GP12293@xxxxxxxxxxx> <1050410014930.ZM20382@xxxxxxxxxxxxxxxxxxxxxxx>
On Sun, Apr 10, 2005 at 01:49:30AM +0000, Bart Schaefer wrote:
> On Apr 9, 4:47pm, Andrew Pimlott wrote:
> } Subject: Re: Bug#303623: [andrew@xxxxxxxxxxx: Bug#303623: zsh: CHECK_JOBS
> }
> } > The issue here seems to be that zsh doesn't actually receive a ctrl-D
> } > keystroke, but rather that there is a true end-of-file on the tty.
> }
> } Ok, but I don't think this should preclude correct behavior. My
> } understanding is that when <C-D> is pressed, the application gets a
> } zero-length read on the terminal
>
> If the TTY driver is interpreting the EOF character, then yes, that is
> what happens. However, zsh supposedly doesn't allow the TTY driver to
> interpret <C-d>; it puts the terminal in CBREAK mode, so it receives a
> literal ASCII '\04' character, so that it's able to invoke the bindkey
> for that, which normally runs delete-char-or-list.
>
> The do-not-exit-when-jobs-are-pending behavior relies on having read a
> '\04' when the input buffer is empty. It's a simulated end-of-file
> rather than a real one.
>
> What *appears* to be happening -- I could still be wrong -- is that on
> the second C-d the CBREAK setting fails to work as expected and zsh in
> fact gets a zero-length read.
Ah, I see, thanks. However, a strace doesn't seem to show that
happening in this case. Here are the reads on FD 10 while reproducing
the problem:
read(10, "\4", 1) = 1
read(10, "t", 1) = 1
read(10, "r", 1) = 1
read(10, "u", 1) = 1
read(10, "e", 1) = 1
read(10, "\n", 1) = 1
read(10, "\4", 1) = 1
Andrew
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