From 81428c3a098b4817a79103ddd6e99e8ceb770772 Mon Sep 17 00:00:00 2001
From: Michael Kerrisk <mtk.manpages@gmail.com>
Date: Fri, 16 May 2014 08:40:02 +0200
Subject: [PATCH] epoll_wait.2: NOTES: describe raw epoll_pwait() system call
 differences

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

diff --git a/man2/epoll_wait.2 b/man2/epoll_wait.2
index a3aa0de8a..eb7fc8cb8 100644
--- a/man2/epoll_wait.2
+++ b/man2/epoll_wait.2
@@ -226,6 +226,19 @@ is 4 and the kernel
 .I HZ
 value is 1000,
 this means that timeouts greater than 35.79 minutes are treated as infinity.
+.SS C library/kernel ABI differences
+The raw
+.BR epoll_pwait ()
+system call has a sixth argument,
+.IR "size_t sigsetsize" ,
+which specifies the size in bytes of the
+.IR sigmask
+argument.
+The glibc
+.BR epoll_pwait ()
+wrapper function specifies this argument as a fixed value
+(equal to
+.IR sizeof(sigset_t) ).
 .SH SEE ALSO
 .BR epoll_create (2),
 .BR epoll_ctl (2),