On 3/18/25 11:18, Andreas Schwab wrote:
Is there a generic way for a program to detect that is it being run inside the linux-user emulation?
Yes, having a reliable way to detect it would be good. My current (unreliable) way to detect it is using uname. The kernel string and arch name don't match: (sid_hppa)root@paq:/# uname -a Linux paq 6.1.0-31-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.128-1 (2025-02-07) parisc GNU/Linux (sid_hppa)root@paq:/# uname -r 6.1.0-31-amd64 (sid_hppa)root@paq:/# uname -m parisc This is a qemu-linux-user parisc(hppa) emulation running on x86-64.
The purpose for that would be to work around limitations of the emulation, like CLONE_VFORK being unsupported.
yes, and robust futexes aren't supported either.
For example, python >= 3.13 needs to avoid using posix_spawn in that case, because the emulation of CLONE_VFORK as a true fork makes it impossible for it to report errors back to the parent process.
