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envelope-from=deller@gmx.de; helo=mout.gmx.net X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org 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 >=3D > 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.