From 361ec6881dd88441ae2f49e58e46e162548fafb0 Mon Sep 17 00:00:00 2001
From: Michael Kerrisk <mtk.manpages@gmail.com>
Date: Fri, 16 May 2014 08:20:43 +0200
Subject: [PATCH] poll.2: Describe fifth argument (sigsetsize) of raw ppoll()
 system call

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
---
 man2/poll.2 | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/man2/poll.2 b/man2/poll.2
index 57f6d13a9..a711bde98 100644
--- a/man2/poll.2
+++ b/man2/poll.2
@@ -374,6 +374,19 @@ Thus, the glibc
 function does not modify its
 .I timeout_ts
 argument.
+
+The raw
+.BR ppoll ()
+system call has a fifth argument,
+.IR "size_t sigsetsize" ,
+which specifies the size in bytes of the
+.IR sigmask
+argument.
+The glibc
+.BR ppoll ()
+wrapper function specifies this argument as a fixed value
+(equal to
+.IR sizeof(sigset_t) ).
 .SH BUGS
 See the discussion of spurious readiness notifications under the
 BUGS section of