linux-kernel - [PATCH v2 1/2] signal.7: Clearly describe ucontext kernel dump to userspace

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Date: Tue, 11 Jun 2024 14:38:22 +0530
From: Dev Jain <dev.jain@....com>
To: alx@...nel.org,
	linux-man@...r.kernel.org
Cc: mingo@...nel.org,
	tglx@...utronix.de,
	mark.rutland@....com,
	ryan.roberts@....com,
	broonie@...nel.org,
	suzuki.poulose@....com,
	Anshuman.Khandual@....com,
	DeepakKumar.Mishra@....com,
	aneesh.kumar@...nel.org,
	linux-kernel@...r.kernel.org,
	Dev Jain <dev.jain@....com>
Subject: [PATCH v2 1/2] signal.7: Clearly describe ucontext kernel dump to userspace

The set of blocked signals is updated from struct sigaction after the
kernel dumps ucontext. Mention this to avoid misunderstanding.

Signed-off-by: Dev Jain <dev.jain@....com>
---
 man/man7/signal.7 | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/man/man7/signal.7 b/man/man7/signal.7
index 4ba5306c8..7d22a7cfe 100644
--- a/man/man7/signal.7
+++ b/man/man7/signal.7
@@ -282,7 +282,13 @@ the thread's alternate signal stack settings.
 .B SA_SIGINFO
 flag, then the above information is accessible via the
 .I ucontext_t
-object that is pointed to by the third argument of the signal handler.)
+object that is pointed to by the third argument of the signal handler.
+This object reflects the state at which the signal is delivered, rather
+than in the handler;
+for example, the mask of blocked signals stored in this object will not
+contain the mask of new signals blocked through
+.BR sigaction(2)).
+
 .IP (1.4)
 Any signals specified in
 .I act\->sa_mask
-- 
2.34.1