From patchwork Fri May 31 15:10:44 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Michal Privoznik X-Patchwork-Id: 13681820 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 2B078C25B75 for ; Fri, 31 May 2024 15:11:59 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1sD3uS-00008U-0z; Fri, 31 May 2024 11:11:12 -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 1sD3uI-00005R-UR for qemu-devel@nongnu.org; Fri, 31 May 2024 11:11:04 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1sD3uE-0005WZ-2n for qemu-devel@nongnu.org; Fri, 31 May 2024 11:11:00 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1717168252; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=/OVgxykSPTZ7KjJ2nv9zefemkRQks8uLwLwTeb9bnis=; b=a9tj3eeeYc9QlB1l61vGHOqZC1AEehbHsNm12sPK1ny8K0BpM5gwD8dl56lOV7QG78Ic94 VJoNZ9NoKVTEVJQMn540ih8r21uvz8bm60J8CBkTOHm4o64I84k/oLwFHpqf3TT30H2uNZ 8EAxuaWHeCCXeNRapzHe/242rQDaiSQ= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-588-qnisU6TWOdaHHD_yWuSHqw-1; Fri, 31 May 2024 11:10:50 -0400 X-MC-Unique: qnisU6TWOdaHHD_yWuSHqw-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 1ED6D101A525 for ; Fri, 31 May 2024 15:10:50 +0000 (UTC) Received: from maggie.brq.redhat.com (unknown [10.43.3.102]) by smtp.corp.redhat.com (Postfix) with ESMTP id BD7033C27 for ; Fri, 31 May 2024 15:10:49 +0000 (UTC) From: Michal Privoznik To: qemu-devel@nongnu.org Subject: [PATCH v3 1/4] osdep: Make qemu_madvise() to set errno in all cases Date: Fri, 31 May 2024 17:10:44 +0200 Message-ID: <393c7b26302cb445f1a086a2c80b1d718c31a071.1717168113.git.mprivozn@redhat.com> In-Reply-To: References: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.1 Received-SPF: pass client-ip=170.10.133.124; envelope-from=mprivozn@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.085, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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 The unspoken premise of qemu_madvise() is that errno is set on error. And it is mostly the case except for posix_madvise() which is documented to return either zero (on success) or a positive error number. This means, we must set errno ourselves. And while at it, make the function return a negative value on error, just like other error paths do. Signed-off-by: Michal Privoznik Reviewed-by: Philippe Mathieu-Daudé --- util/osdep.c | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) diff --git a/util/osdep.c b/util/osdep.c index e996c4744a..1345238a5c 100644 --- a/util/osdep.c +++ b/util/osdep.c @@ -57,7 +57,19 @@ int qemu_madvise(void *addr, size_t len, int advice) #if defined(CONFIG_MADVISE) return madvise(addr, len, advice); #elif defined(CONFIG_POSIX_MADVISE) - return posix_madvise(addr, len, advice); + /* + * On Darwin posix_madvise() has the same return semantics as + * plain madvise, i.e. errno is set and -1 is returned. Otherwise, + * a positive error number is returned. + */ + int rc = posix_madvise(addr, len, advice); + if (rc) { + if (rc > 0) { + errno = rc; + } + return -1; + } + return 0; #else errno = EINVAL; return -1;