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Re: [PATCH] sysdeps/wait: Use the waitid syscall if required

From: "Dmitry V. Levin" <ldv at altlinux dot org>
To: Alistair Francis <alistair dot francis at wdc dot com>
Cc: libc-alpha at sourceware dot org, alistair23 at gmail dot com
Date: Sat, 12 Oct 2019 15:24:50 +0300
Subject: Re: [PATCH] sysdeps/wait: Use the waitid syscall if required
References: <20190925225514.7224-1-alistair.francis@wdc.com>

On Wed, Sep 25, 2019 at 03:55:14PM -0700, Alistair Francis wrote:
> If the waitpid and wait4 syscalls aren't avaliable (such as y2038 safe
> 32-bit systems) let us use the waitid syscall isntead.
> 
> Unfortunately waitid is substantially differnt to waitpid and wait4, so
> the conversion ends up being complex.
> 
> For full support we need the 5.4+ kernel as that allows a pid of 0 with
> the P_PGID idtype.
> 
> 2019-09-16  Alistair Francis  <alistair.francis@wdc.com>
> 
> 	* sysdeps/unix/sysv/linux/wait.c: Use the waitid syscall if required.
> 	* sysdeps/unix/sysv/linux/waitpid.c: Likewise.
> 	* sysdeps/unix/sysv/linux/waitpid_nocancel.c: Likewise.

If wait4 is not available, shouldn't it be emulated as well as waitpid?


-- 
ldv

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