From 2a73d3e870a25620d39825258de151fc7c1210dc Mon Sep 17 00:00:00 2001
From: Michael Kerrisk <mtk.manpages@gmail.com>
Date: Thu, 30 Mar 2017 14:18:05 +0200
Subject: [PATCH] sigaction.2: Show the prototype of an SA_SIGINFO signal
 handler

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
---
 man2/sigaction.2 | 25 +++++++++++++++++++++----
 1 file changed, 21 insertions(+), 4 deletions(-)

diff --git a/man2/sigaction.2 b/man2/sigaction.2
index 23b4703db..b1cc5bfe8 100644
--- a/man2/sigaction.2
+++ b/man2/sigaction.2
@@ -262,12 +262,29 @@ This flag is meaningful only when establishing a signal handler.
 .\" .I sa_sigaction
 .\" field was added in Linux 2.1.86.)
 .RE
-.PP
+.SS The siginfo_t argument to a SA_SIGINFO handler
+When the
+.B SA_SIGINFO
+flag is specified in
+.IR act.sa_flags ,
+the signal handler address is passed via the
+.IR act.sa_sigaction
+field.
+This handler takes three arguments, as follows:
+
+.nf
+.in +4n
+void
+handler(int sig, siginfo_t *info, void *ucontext)
+{
+    ...
+}
+.in
+.fi
+
 The
 .I siginfo_t
-argument to
-.I sa_sigaction
-is a struct with the following fields:
+data type is a structure with the following fields:
 .sp
 .in +4n
 .nf