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Re: [RFC v2 08/20] sysdeps/wait: Use waitid if avaliable

From: Florian Weimer <fweimer at redhat dot com>
To: Zack Weinberg <zackw at panix dot com>
Cc: Alistair Francis <alistair dot francis at wdc dot com>, GNU C Library <libc-alpha at sourceware dot org>
Date: Tue, 25 Jun 2019 13:06:49 +0200
Subject: Re: [RFC v2 08/20] sysdeps/wait: Use waitid if avaliable
References: <cover.1561421042.git.alistair.francis@wdc.com> <2df9d3878359585ac1cc46243fb6664f7a50b3b3.1561421042.git.alistair.francis@wdc.com> <CAKCAbMhyUiEZcfg-BNL_sqUAFmtEWCEgoyUwMGOdB_jLbvKJ6Q@mail.gmail.com>

* Zack Weinberg:

> On Mon, Jun 24, 2019 at 8:12 PM Alistair Francis
> <alistair.francis@wdc.com> wrote:
>>
>> If the waitid syscall is avaliable let's use that as waitpid
>> and wait4 aren't always avaliable (they aren't avaliable on RV32).
>
> wait4 does something that can't be done any other way (retrieve
> resource usage information), RV32 should have it.

I think the problem is that the kernel provides wait4 under a different
name because struct rusage has two fields of struct timeval.

I think this needs to be covered by the syscall renaming mechanism, to
get a working wait4, and not changes to wait.

Thanks,
Florian

Follow-Ups:
- Re: [RFC v2 08/20] sysdeps/wait: Use waitid if avaliable
  - From: Arnd Bergmann

References:
- [RFC v2 00/20] RISC-V glibc port for the 32-bit
  - From: Alistair Francis
- [RFC v2 08/20] sysdeps/wait: Use waitid if avaliable
  - From: Alistair Francis
- Re: [RFC v2 08/20] sysdeps/wait: Use waitid if avaliable
  - From: Zack Weinberg

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