linux-kernel - [PATCH 2/2] sigaction.2: wfix - Clarify si

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Message-Id: <20210226172634.26905-3-yu-cheng.yu@intel.com>
Date:   Fri, 26 Feb 2021 09:26:34 -0800
From:   Yu-cheng Yu <yu-cheng.yu@...el.com>
To:     linux-man@...r.kernel.org
Cc:     Yu-cheng Yu <yu-cheng.yu@...el.com>,
        Alejandro Colomar <alx.manpages@...il.com>,
        Michael Kerrisk <mtk.manpages@...il.com>,
        Andy Lutomirski <luto@...nel.org>,
        Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Florian Weimer <fweimer@...hat.com>,
        "H.J. Lu" <hjl.tools@...il.com>, linux-kernel@...r.kernel.org,
        linux-api@...r.kenel.org
Subject: [PATCH 2/2] sigaction.2: wfix - Clarify si_addr description.

SIGSEGV fills si_addr only for memory access faults.  Add a note to clarify.

Signed-off-by: Yu-cheng Yu <yu-cheng.yu@...el.com>
Cc: Alejandro Colomar <alx.manpages@...il.com>
Cc: Michael Kerrisk <mtk.manpages@...il.com>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: Florian Weimer <fweimer@...hat.com>
Cc: "H.J. Lu" <hjl.tools@...il.com>
Cc: linux-kernel@...r.kernel.org
Cc: linux-api@...r.kenel.org
Link: https://lore.kernel.org/linux-api/20210217222730.15819-7-yu-cheng.yu@intel.com/
---
 man2/sigaction.2 | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/man2/sigaction.2 b/man2/sigaction.2
index 49a30f11e..bea884a23 100644
--- a/man2/sigaction.2
+++ b/man2/sigaction.2
@@ -467,7 +467,7 @@ and
 .BR SIGTRAP
 fill in
 .I si_addr
-with the address of the fault.
+with the address of the fault (see notes).
 On some architectures,
 these signals also fill in the
 .I si_trapno
@@ -955,6 +955,11 @@ It is not possible to block
 .IR sa_mask ).
 Attempts to do so are silently ignored.
 .PP
+In a
+.B SIGSEGV,
+if the fault is a memory access fault, si_addr is filled with the address
+causing the fault, otherwise it is not filled.
+.PP
 See
 .BR sigsetops (3)
 for details on manipulating signal sets.
-- 
2.21.0