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

[Dev Jain <dev.jain@arm.com>]

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@arm.com>
---
 man/man7/signal.7 | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/man/man7/signal.7 b/man/man7/signal.7
index 4ba5306c8..17e75c86d 100644
--- a/man/man7/signal.7
+++ b/man/man7/signal.7
@@ -282,7 +282,15 @@ 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.
+We emphasize on the fact that this object contains context information
+of the thread, present before jumping into the handler; the set of
+blocked signals for the current thread would be updated from struct
+sigaction only after
+.I ucontext_t
+has been dumped to userspace. This semantically makes sense since the
+context for which the signals have been blocked, remains only during
+execution of the handler.)
 .IP (1.4)
 Any signals specified in
 .I act\->sa_mask
-- 
2.34.1