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a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1717584307; 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=4yvvHCsFGcQy3avS2tqQfsLMqNzxPdKw9AyVqslnxSY=; b=ONu4IcrdCfxD9xUBc1UfwJmQJXfUkGOmGvP5tfk6zKOEzJpdBJvCwNW+jwB2wlosGstSsT wtnWVrhBQ4FQyhccfbEIIx3HB0kzpg9++Cq6gcIxXYRqomyvTfhqbEGJo9f63ktdLXrUth cddrviLs8N0eJx3xZrgKKZg84AVRuGo= X-MC-Unique: NBgpX8OwM4WoDpad3TMVew-1 From: Michal Privoznik To: qemu-devel@nongnu.org Subject: [PATCH v4 2/5] osdep: Make qemu_madvise() to set errno in all cases Date: Wed, 5 Jun 2024 12:44:55 +0200 Message-ID: In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=mprivozn@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: 12 X-Spam_score: 1.2 X-Spam_bar: + X-Spam_report: (1.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, 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, RCVD_IN_SBL_CSS=3.335, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=no 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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1717584386877100003 Content-Type: text/plain; charset="utf-8" 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: David Hildenbrand --- util/osdep.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/util/osdep.c b/util/osdep.c index e996c4744a..e42f4e8121 100644 --- a/util/osdep.c +++ b/util/osdep.c @@ -57,7 +57,12 @@ 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); + int rc =3D posix_madvise(addr, len, advice); + if (rc) { + errno =3D rc; + return -1; + } + return 0; #else errno =3D EINVAL; return -1; --=20 2.44.1