linux-kernel - [RFC PATCH for-next 1/4] epoll: struct epoll userspace definiton

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Date:	Sun, 23 Feb 2014 17:42:39 -0800
From:	Nathaniel Yazdani <n1ght.4nd.d4y@...il.com>
To:	viro@...iv.linux.org.uk
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Nathaniel Yazdani <n1ght.4nd.d4y@...il.com>
Subject: [RFC PATCH for-next 1/4] epoll: struct epoll userspace definiton

In order to facilitate the addition, modification, and/or deletion
of multiple eventpoll entries in a single system call, struct epoll
is defined to communicate the same information as struct epoll_event
plus the associated file descriptor. The new epoll() system call uses
it for both input and output.

Signed-off-by: Nathaniel Yazdani <n1ght.4nd.d4y@...il.com>
---
diff --git a/include/uapi/linux/eventpoll.h b/include/uapi/linux/eventpoll.h
index bc81fb2..e702072 100644
--- a/include/uapi/linux/eventpoll.h
+++ b/include/uapi/linux/eventpoll.h
@@ -61,6 +61,12 @@ struct epoll_event {
 	__u64 data;
 } EPOLL_PACKED;
 
+struct epoll {
+	int ep_fildes; /* file descriptor */
+	int ep_events; /* triggering events */
+	long long ep_ident; /* entry ID (cf. epoll_event->data) */
+} EPOLL_PACKED;
+
 #ifdef CONFIG_PM_SLEEP
 static inline void ep_take_care_of_epollwakeup(struct epoll_event *epev)
 {
--
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