From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 8947EC282EC for ; Tue, 18 Mar 2025 10:20:01 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1tuU2M-0005ok-EF; Tue, 18 Mar 2025 06:19:06 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1tuU1h-0005eq-IK for qemu-devel@nongnu.org; Tue, 18 Mar 2025 06:18:33 -0400 Received: from smtp-out1.suse.de ([195.135.223.130]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1tuU1c-0007wt-IA for qemu-devel@nongnu.org; Tue, 18 Mar 2025 06:18:23 -0400 Received: from hawking.nue2.suse.org (unknown [10.168.4.11]) by smtp-out1.suse.de (Postfix) with ESMTP id 8BF9121A1F for ; Tue, 18 Mar 2025 10:18:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1742293093; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc: mime-version:mime-version:content-type:content-type; bh=SxUJkUqRknIe0+svXO5oIru+3Vn7Y3Sds4rDQzm6iuE=; b=BHnA5wrmtl0UY6YWsvNjPR7dJwHADVrE2f/Rk3MYBBuCV/wkoaXo5MGctXkinhvsUCfJLb lz99qg0iZx14MavI8+3CLNbQCbielaOojlhVvbzkrjyrcV7F2CgAMxPm/Zbb9g6EM6pinC p2gqP5kKendu+mK9e7kShMSMmn5P7bc= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1742293093; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc: mime-version:mime-version:content-type:content-type; bh=SxUJkUqRknIe0+svXO5oIru+3Vn7Y3Sds4rDQzm6iuE=; b=+Fe/Ey9g6upAq7Nba6jn7Tjavge+a1NoVdZIL3ZlNDG+luZ8tNoprUd77xtQaIlyNWIi3l dpy1dCu3EyrZWGCg== Authentication-Results: smtp-out1.suse.de; none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1742293093; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc: mime-version:mime-version:content-type:content-type; bh=SxUJkUqRknIe0+svXO5oIru+3Vn7Y3Sds4rDQzm6iuE=; b=BHnA5wrmtl0UY6YWsvNjPR7dJwHADVrE2f/Rk3MYBBuCV/wkoaXo5MGctXkinhvsUCfJLb lz99qg0iZx14MavI8+3CLNbQCbielaOojlhVvbzkrjyrcV7F2CgAMxPm/Zbb9g6EM6pinC p2gqP5kKendu+mK9e7kShMSMmn5P7bc= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1742293093; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc: mime-version:mime-version:content-type:content-type; bh=SxUJkUqRknIe0+svXO5oIru+3Vn7Y3Sds4rDQzm6iuE=; b=+Fe/Ey9g6upAq7Nba6jn7Tjavge+a1NoVdZIL3ZlNDG+luZ8tNoprUd77xtQaIlyNWIi3l dpy1dCu3EyrZWGCg== Received: by hawking.nue2.suse.org (Postfix, from userid 17005) id 7BC6C4A0561; Tue, 18 Mar 2025 11:18:13 +0100 (CET) From: Andreas Schwab To: qemu-devel@nongnu.org Subject: Generic way to detect qemu linux-user emulation Date: Tue, 18 Mar 2025 11:18:13 +0100 Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain X-Spamd-Result: default: False [-4.20 / 50.00]; BAYES_HAM(-3.00)[99.99%]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.20)[-0.998]; MIME_GOOD(-0.10)[text/plain]; RCVD_NO_TLS_LAST(0.10)[]; ARC_NA(0.00)[]; RCPT_COUNT_ONE(0.00)[1]; MIME_TRACE(0.00)[0:+]; RCVD_COUNT_ONE(0.00)[1]; MID_RHS_MATCH_FROM(0.00)[]; FROM_HAS_DN(0.00)[]; FUZZY_BLOCKED(0.00)[rspamd.com]; FROM_EQ_ENVFROM(0.00)[]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; TO_DN_NONE(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:email,suse.de:mid] Received-SPF: pass client-ip=195.135.223.130; envelope-from=schwab@suse.de; helo=smtp-out1.suse.de X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 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, RCVD_IN_DNSWL_MED=-2.3, 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 Is there a generic way for a program to detect that is it being run inside the linux-user emulation? The purpose for that would be to work around limitations of the emulation, like CLONE_VFORK being unsupported. 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. -- Andreas Schwab, SUSE Labs, schwab@suse.de GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE 1748 E4D4 88E3 0EEA B9D7 "And now for something completely different."