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bh=/OVgxykSPTZ7KjJ2nv9zefemkRQks8uLwLwTeb9bnis=; b=a9tj3eeeYc9QlB1l61vGHOqZC1AEehbHsNm12sPK1ny8K0BpM5gwD8dl56lOV7QG78Ic94 VJoNZ9NoKVTEVJQMn540ih8r21uvz8bm60J8CBkTOHm4o64I84k/oLwFHpqf3TT30H2uNZ 8EAxuaWHeCCXeNRapzHe/242rQDaiSQ= X-MC-Unique: qnisU6TWOdaHHD_yWuSHqw-1 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 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.1 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: 1717168320410100003 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: Philippe Mathieu-Daud=C3=A9 --- 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 =3D posix_madvise(addr, len, advice); + if (rc) { + if (rc > 0) { + errno =3D rc; + } + return -1; + } + return 0; #else errno =3D EINVAL; return -1; --=20 2.44.1