linux-kernel - [PATCH RFC v2 6/7] epoll: Add implementation for epoll

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Message-Id: <1423046213-7043-7-git-send-email-famz@redhat.com>
Date:	Wed,  4 Feb 2015 18:36:52 +0800
From:	Fam Zheng <famz@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kees Cook <keescook@...omium.org>,
	Andy Lutomirski <luto@...capital.net>,
	David Herrmann <dh.herrmann@...il.com>,
	Alexei Starovoitov <ast@...mgrid.com>,
	Miklos Szeredi <mszeredi@...e.cz>,
	David Drysdale <drysdale@...gle.com>,
	Oleg Nesterov <oleg@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	Vivek Goyal <vgoyal@...hat.com>,
	Mike Frysinger <vapier@...too.org>,
	"Theodore Ts'o" <tytso@....edu>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Rasmus Villemoes <linux@...musvillemoes.dk>,
	Rashika Kheria <rashika.kheria@...il.com>,
	Hugh Dickins <hughd@...gle.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Fam Zheng <famz@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-fsdevel@...r.kernel.org, linux-api@...r.kernel.org,
	Josh Triplett <josh@...htriplett.org>,
	"Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Omar Sandoval <osandov@...ndov.com>
Subject: [PATCH RFC v2 6/7] epoll: Add implementation for epoll_pwait1

This is the new implementation for poll which uses timespec as timeout,
and has a flags parameter.

Signed-off-by: Fam Zheng <famz@...hat.com>
---
 fs/eventpoll.c           | 34 ++++++++++++++++++++++++++++++++++
 include/linux/syscalls.h |  5 +++++
 2 files changed, 39 insertions(+)

diff --git a/fs/eventpoll.c b/fs/eventpoll.c
index 4eb40e0..59b2db9 100644
--- a/fs/eventpoll.c
+++ b/fs/eventpoll.c
@@ -2115,6 +2115,40 @@ out:
 	return ret;
 }
 
+SYSCALL_DEFINE6(epoll_pwait1, int, epfd, int, flags,
+		struct epoll_event __user *, events,
+		int, maxevents, struct timespec __user *, timeout,
+		void __user *, sig)
+{
+	size_t sigsetsize = 0;
+	sigset_t ksigmask;
+	sigset_t __user *sigmask = NULL;
+	struct timespec kts;
+	ktime_t kt = { 0 };
+
+	if (flags)
+		return -EINVAL;
+	if (sig) {
+		if (!access_ok(VERIFY_READ, sig, sizeof(void *)+sizeof(size_t))
+		    || __get_user(sigmask, (sigset_t __user * __user *)sig)
+		    || __get_user(sigsetsize,
+				  (size_t __user *)(sig+sizeof(void *))))
+			return -EFAULT;
+		if (sigsetsize != sizeof(sigset_t))
+			return -EINVAL;
+		if (copy_from_user(&ksigmask, sigmask, sizeof(ksigmask)))
+			return -EFAULT;
+	}
+	if (timeout) {
+		if (copy_from_user(&kts, timeout, sizeof(kts)))
+			return -EFAULT;
+		kt = timespec_to_ktime(kts);
+	}
+
+	return epoll_pwait_do(epfd, events, maxevents, CLOCK_MONOTONIC,
+			      kt, &ksigmask);
+}
+
 #ifdef CONFIG_COMPAT
 COMPAT_SYSCALL_DEFINE6(epoll_pwait, int, epfd,
 		       struct epoll_event __user *, events,
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index 117822c..0c3ecdb 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -631,6 +631,11 @@ asmlinkage long sys_epoll_pwait(int epfd, struct epoll_event __user *events,
 				int maxevents, int timeout,
 				const sigset_t __user *sigmask,
 				size_t sigsetsize);
+asmlinkage long sys_epoll_pwait1(int epfd, int flags,
+				 struct epoll_event __user *events,
+				 int maxevents,
+				 struct timespec __user *timeout,
+				 void __user *sig);
 asmlinkage long sys_epoll_ctl_batch(int epfd, int flags,
 				    int ncmds,
 				    struct epoll_ctl_cmd __user *cmds);
-- 
1.9.3

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