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bh=4yvvHCsFGcQy3avS2tqQfsLMqNzxPdKw9AyVqslnxSY=; b=YgkhqZPCSwr1ss7G9aSEPeeW+dosxshfJ6d00M8jQIHPPhT98BJY7Qh9cfBl2vO3vkzD+Y AAOijYOHnwoMWzTv5K0Ws510vd5aJwAwF3JXJrmelpoDVNMKPP6YNLPv3wKBvD78miNGit M0Q8thhp0bSa+vSQY7G2IcrzyuQqyj0= X-MC-Unique: DO92o0PrOp-8hmP6x2A4IQ-1 From: Michal Privoznik To: qemu-devel@nongnu.org Cc: david@redhat.com, imammedo@redhat.com Subject: [PATCH v2 1/4] osdep: Make qemu_madvise() to set errno in all cases Date: Fri, 31 May 2024 09:28:57 +0200 Message-ID: In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.10 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=170.10.133.124; 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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1717140584538100005 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