Re: [Qemu-devel] [PATCH] linux-user/main.c: Always set QEMU_LD_PREFIX when interp_prefix is changed

[Chen Gang]

From: address@hidden
> Date: Thu, 10 Sep 2015 10:02:27 +0100
>
> On 10 September 2015 at 06:43, <address@hidden> wrote:
>> From: Chen Gang <address@hidden>
>>
>> If qemu sets interp_prfix via command line '-L' instead of environments
>> variable QEMU_LD_PREFIX, it will cause syscall execve() failed. Because
>> the 2nd qemu has no command line '-L'.
>>
>> So qemu need always set QEMU_LD_PREFIX when interp_prefix is changed.
>
> I think this is user error. If you want exec to work automatically
> onto a second QEMU then you need to set up binfmt misc with a
> wrapper and probably the environment variables. I don't
> think we need to turn all our command line switches into
> environment variables: they're not supposed to be somehow
> magically inherited by child QEMU processes.
>

For me, when users type a command line under Linux shell, they always
assume all related executions will know about their commands, they need
not set the environments again (at least, in one process, they assume so).

execve() will not change the pid, so the users will 'feel': they are using only
one process.

I guess all 'users' will support me (this patch will let them a little easier). 
;-)


Thanks.
--
Chen Gang

Open, share, and attitude like air, water, and life which God blessed