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From: Florian Weimer <fweimer@redhat.com>
To: cambda@linux.alibaba.com
Cc: "Eric W. Biederman" <ebiederm@xmission.com>,
	linux-kernel@vger.kernel.org, linux-api@vger.kernel.org,
	Xuan Zhuo <xuanzhuo@linux.alibaba.com>,
	Dust Li <dust.li@linux.alibaba.com>,
	Tony Lu <tonylu@linux.alibaba.com>
Subject: Re: Syscall kill() can send signal to thread ID
Date: Fri, 23 Sep 2022 09:53:30 +0200	[thread overview]
Message-ID: <87illeedc5.fsf@oldenburg.str.redhat.com> (raw)
In-Reply-To: <0CC7D0E7-71C5-4DAC-8A01-F9E13659F864@linux.alibaba.com> (cambda@linux.alibaba.com's message of "Fri, 23 Sep 2022 14:25:05 +0800")

> I don't quite understand what you mean, sorry. But if kill() returns
> -ESRCH for tid which is not equal to tgid, kill() can only send signal
> to thread group via main thread id, that is what BSD did and manual
> said. It seems not odd?

It's still odd because there's one TID per process that's valid for
kill by accident.  That's all.

Thanks,
Florian


  reply	other threads:[~2022-09-23  7:53 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-09-22  9:11 Syscall kill() can send signal to thread ID cambda
2022-09-22 15:09 ` Eric W. Biederman
2022-09-23  5:31   ` Florian Weimer
2022-09-23  6:25     ` cambda
2022-09-23  7:53       ` Florian Weimer [this message]
2022-09-23  8:40         ` Cambda Zhu
2022-09-23 21:15           ` Eric W. Biederman
2022-09-22 15:33 ` Eric W. Biederman
2022-09-23  3:56   ` cambda
2022-09-23 11:24     ` David Laight
2022-09-23 21:21     ` Eric W. Biederman
2022-09-24  3:16       ` Cambda Zhu

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