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Wed, 21 Jul 2021 00:18:43 -0700 (PDT) X-DH-BACKEND: pdx1-sub0-mail-a42 To: libc-alpha@sourceware.org Subject: [PATCH v2] manual: Document unsupported cases for interposition Date: Wed, 21 Jul 2021 12:48:23 +0530 Message-Id: <20210721071823.1364166-1-siddhesh@sourceware.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <8735s9v294.fsf@oldenburg.str.redhat.com> References: <8735s9v294.fsf@oldenburg.str.redhat.com> MIME-Version: 1.0 X-Spam-Status: No, score=-3494.1 required=5.0 tests=BAYES_00, GIT_PATCH_0, JMQ_SPF_NEUTRAL, KAM_DMARC_NONE, KAM_DMARC_STATUS, RCVD_IN_BARRACUDACENTRAL, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H3, RCVD_IN_MSPIKE_WL, SPF_HELO_NONE, SPF_NEUTRAL, TXREP autolearn=ham autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Siddhesh Poyarekar via Libc-alpha From: Siddhesh Poyarekar Reply-To: Siddhesh Poyarekar Cc: fweimer@redhat.com Errors-To: libc-alpha-bounces+incoming=patchwork.ozlabs.org@sourceware.org Sender: "Libc-alpha" These functions call the core allocator functions (realloc and malloc respectively) and are hence guaranteed to allocate memory using the correct functions when multiple allocators are interposed. Having these functions interposed in one allocator and not another may result in confusion, hence discourage interposing them altogether. --- manual/memory.texi | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/manual/memory.texi b/manual/memory.texi index 31ee36be8c..5fb58af736 100644 --- a/manual/memory.texi +++ b/manual/memory.texi @@ -2033,6 +2033,13 @@ when a replacement @code{malloc} is in use. However, failure to replace these functions typically does not result in crashes or other incorrect application behavior, but may result in static linking failures. +There are other functions (@code{reallocarray}, @code{strdup}, etc.) in +@theglibc{} that are not listed above but return newly allocated memory to +callers. Replacement of these functions is not supported and may produce +incorrect results. @theglibc{} implementations of these functions call +the replacement allocator functions whenever available, so they will work +correctly with @code{malloc} replacement. + @node Obstacks @subsection Obstacks @cindex obstacks