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From: Markus Wichmann <nullplan@gmx.net>
To: musl@lists.openwall.com
Subject: Re: [musl] waitpid (wait4) on Linux 5 returns invalid values
Date: Tue, 19 Jan 2021 20:33:37 +0100	[thread overview]
Message-ID: <20210119193337.GB2006@voyager> (raw)
In-Reply-To: <CADFzTtdU2h6pG3B+bdvUjFfDy=GxJ-poC18QpjaRinJchayNAA@mail.gmail.com>

On Tue, Jan 19, 2021 at 10:18:04AM -0800, Rasmus Andersson wrote:
> However the wait4 syscall[3] in Linux 5 returns other values,
> specifically it returns errors as negative values. The error that
> trips up programs like runit's runsv is ECHILD (-10) which wait4
> returns when there are no children (i.e. they have exited.)
>

Hmm... that is very weird. That should not happen. Because the
syscall_cp macro already contains a call to __syscall_ret(), which does
exactly what you propose. So that means, there is something else going
on in your copy of the code. Did you change anything about the source
code? Or can you disassemble the function to see what it does?

Ciao,
Markus

  reply	other threads:[~2021-01-19 19:33 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-19 18:18 Rasmus Andersson
2021-01-19 19:33 ` Markus Wichmann [this message]
2021-01-19 20:17   ` Rasmus Andersson
2021-01-19 20:28     ` Rasmus Andersson
2021-01-19 20:35       ` Rasmus Andersson
2021-01-19 20:56         ` Rasmus Andersson
2021-01-19 21:16         ` Rich Felker
2021-01-19 22:00           ` Rasmus Andersson
2021-01-19 22:02             ` Rasmus Andersson
2021-01-19 23:01               ` Zach van Rijn
2021-01-19 23:07                 ` Rasmus Andersson

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