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[87.106.108.193]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-48dfd5035bbsm6359511f8f.44.2026.10.16.10.33.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 16 Oct 2026 10:33:36 -0700 (PDT) From: =?UTF-8?q?G=C3=BCnther=20Noack?= To: Alejandro Colomar Cc: linux-man@vger.kernel.org, =?UTF-8?q?G=C3=BCnther=20Noack?= Subject: [PATCH 22/24] man/man7/unix.7: Remove mentions of unsupported out-of-band messaging Date: Fri, 16 Oct 2026 19:31:37 +0200 Message-ID: <20261016173139.13076-23-gnoack3000@gmail.com> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261016173139.13076-1-gnoack3000@gmail.com> References: <20261016173139.13076-1-gnoack3000@gmail.com> Precedence: bulk X-Mailing-List: linux-man@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Limited support for MSG_OOB was added in linux.git 314001f0bf92 (2021-08-04; "af_unix: Add OOB support"). Its removal was discussed in [1] but has so far not happened. The support is conditional on the CONFIG_AF_UNIX_OOB kconfig option, so stating that it is supported would also be wrong. Link: [1] Signed-off-by: Günther Noack --- Notes: This one is authored from scratch by hand; in the initial version, the LLM spotted the inaccuracy and then proceeded to document the feature in full glory -- I think it would be the wrong call to propagate the use of a feature whose removal has been discussed already due to low usage and security issues. (See cover letter as well) man/man7/unix.7 | 13 ++----------- 1 file changed, 2 insertions(+), 11 deletions(-) diff --git a/man/man7/unix.7 b/man/man7/unix.7 index 8d1a53948f5b..bcb58336a1d8 100644 --- a/man/man7/unix.7 +++ b/man/man7/unix.7 @@ -401,14 +401,6 @@ The change to 5 bytes came in Linux 2.3.15.) The following paragraphs describe domain-specific details and unsupported features of the sockets API for UNIX domain sockets on Linux. .P -UNIX domain sockets do not support the transmission of -out-of-band data (the -.B MSG_OOB -flag for -.BR send (2) -and -.BR recv (2)). -.P The .BR send (2) .B MSG_MORE @@ -780,7 +772,8 @@ Socket operation needs a target address, but the socket is not connected. .TP .B EOPNOTSUPP Stream operation called on non-stream oriented socket or tried to -use the out-of-band data option. +use the out-of-band data option +when it isn't supported. .TP .B EPERM The sender passed invalid credentials in the @@ -883,8 +876,6 @@ at least one byte of nonancillary data in the same or .BR recvmsg (2) call. -.P -UNIX domain stream sockets do not support the notion of out-of-band data. .\" .SH BUGS When binding a socket to an address, -- 2.56.0