On 10 September 2015 at 10:32, Chen Gang <xili_gchen_5...@hotmail.com> wrote: > From: peter.mayd...@linaro.org >> Date: Thu, 10 Sep 2015 10:02:27 +0100 >> >> On 10 September 2015 at 06:43, <gang.chen.5...@gmail.com> wrote: >>> From: Chen Gang <gang.chen.5...@gmail.com> >>> >>> 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.
But execve won't do the right thing if it's another target binary, unless you've set up binfmt_misc. And if you're setting up binfmt_misc then (a) you should just do it right and (b) you wouldn't have been directly running QEMU with command line arguments in the first place. I really don't think we need to change anything here. thanks -- PMM
