linux-kernel - Re: Syscall kill() can send signal to thread ID

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Message-ID: <87illeedc5.fsf@oldenburg.str.redhat.com>
Date:   Fri, 23 Sep 2022 09:53:30 +0200
From:   Florian Weimer <fweimer@...hat.com>
To:     cambda@...ux.alibaba.com
Cc:     "Eric W. Biederman" <ebiederm@...ssion.com>,
        linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
        Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
        Dust Li <dust.li@...ux.alibaba.com>,
        Tony Lu <tonylu@...ux.alibaba.com>
Subject: Re: Syscall kill() can send signal to thread ID

> 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