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Subject:	Re: zsh (oh-my-zsh) hangs on cygwin-3.5.5-1
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From:	Daisuke Fujimura via Cygwin <cygwin AT cygwin DOT com>
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> How about sending SIGCHLD to the newest child, i.e. kill -CHLD 1728 for this case?

No, sent to zsh with mintty as direct parent. (In this case it was
`kill -CHLD 1672`.)

The result of sending SIGCHLD for the newest child is as follows:

```
$ ps
PID PPID PGID WINPID TTY UID STIME COMMAND
214 213 181 4792 pty0 197609 20:22:34 /usr/bin/zsh
213 181 181 6536 pty0 197609 20:22:34 /usr/bin/zsh
217 1 217 4788 cons0 197609 20:22:44 /usr/bin/bash
224 217 224 4728 cons0 197609 20:22:48 /usr/bin/ps
181 180 181 9652 pty0 197609 20:22:33 /usr/bin/zsh
180 1 180 4084 ? 197609 20:22:33 /usr/bin/mintty

$ kill -CHLD 214

$ ps
PID PPID PGID WINPID TTY UID STIME COMMAND
217 1 217 4788 cons0 197609 20:22:44 /usr/bin/bash
I 181 180 181 9652 pty0 197609 20:22:33 /usr/bin/zsh
225 217 225 2996 cons0 197609 20:26:48 /usr/bin/ps
180 1 180 4084 ? 197609 20:22:33 /usr/bin/mintty
```

The prompt returned.

On Sun, Dec 22, 2024 at 12:28 PM Takashi Yano via Cygwin
<cygwin AT cygwin DOT com> wrote:
>
> On Sun, 22 Dec 2024 10:59:11 +0900
> Daisuke Fujimura wrote:
> > > Could you please test if additional SIGCHLD can release hanging?
> >
> > Start mintty and check the process from another bash.
> >
> > $ ps
> > PID PPID PGID WINPID TTY UID STIME COMMAND
> > 1713 1662 1713 6800 cons0 197609 04:26:01 /usr/bin/ps
> > 1671 1 1671 6072 ? 197609 04:25:47 /usr/bin/mintty
> > I 1672 1671 1672 2096 pty0 197609 04:25:48 /usr/bin/zsh
> > 1662 1 1662 4696 cons0 197609 04:24:21 /usr/bin/bash
> >
> > After typing enter into zsh several times, the prompt is not returned.
>
> OK. I could reproduce it after typing enter about ~100 times.
>
> > $ ps
> > PID PPID PGID WINPID TTY UID STIME COMMAND
> > 1728 1727 1672 3948 pty0 197609 04:26:10 /usr/bin/zsh
> > 1731 1662 1731 7644 cons0 197609 04:26:14 /usr/bin/ps
> > 1727 1672 1672 4076 pty0 197609 04:26:10 /usr/bin/zsh
> > 1671 1 1671 6072 ? 197609 04:25:47 /usr/bin/mintty
> > 1672 1671 1672 2096 pty0 197609 04:25:48 /usr/bin/zsh
> > 1662 1 1662 4696 cons0 197609 04:24:21 /usr/bin/bash
> >
> > SIGCHLD is sent to zsh with mintty as parent, but nothing seems to change.
> >
> > $ kill -CHLD 1672
> > $ ps
> > PID PPID PGID WINPID TTY UID STIME COMMAND
> > 1728 1727 1672 3948 pty0 197609 04:26:10 /usr/bin/zsh
> > 1727 1672 1672 4076 pty0 197609 04:26:10 /usr/bin/zsh
> > 1671 1 1671 6072 ? 197609 04:25:47 /usr/bin/mintty
> > 1672 1671 1672 2096 pty0 197609 04:25:48 /usr/bin/zsh
> > 1733 1662 1733 5388 cons0 197609 04:33:39 /usr/bin/ps
> > 1662 1 1662 4696 cons0 197609 04:24:21 /usr/bin/bash
>
> How about sending SIGCHLD to the newest child, i.e. kill -CHLD 1728
> for this case?
>
> --
> Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp>
>
> --
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