Consolidate Linux epoll_wait syscall

This patch consolidates the epoll_wait Linux syscall generation on
sysdeps/unix/sysv/linux/epoll_wait.c.  The implementation tries to
use __NR_epoll_wait if defined, otherwise calls epoll_pwait.

Checked on i686-linux-gnu, x86_64-linux-gnu, x86_64-linux-gnux32,
arch64-linux-gnu, arm-linux-gnueabihf, and powerpc64le-linux-gnu.

	* sysdeps/unix/sysv/linux/epoll_wait.c: New file.
	* sysdeps/unix/sysv/linux/generic/epoll_wait.c: Remove file.
	* sysdeps/unix/sysv/linux/syscalls.list: Remove epoll_wait from
	auto-generation list.

1 files changed, 32 insertions, 0 deletions

diff --git a/sysdeps/unix/sysv/linux/epoll_wait.c b/sysdeps/unix/sysv/linux/epoll_wait.c
new file mode 100644
index 0000000000..eb6e6d3ace
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/epoll_wait.c
@@ -0,0 +1,32 @@
+/* Linux epoll_wait syscall implementation.
+   Copyright (C) 2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library.  If not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <stddef.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/epoll.h>
+
+int
+epoll_wait (int epfd, struct epoll_event *events, int maxevents, int timeout)
+{
+#ifdef __NR_epoll_wait
+  return SYSCALL_CANCEL (epoll_wait, epfd, events, maxevents, timeout);
+#else
+  return epoll_pwait (epfd, events, maxevents, timeout, NULL);
+#endif
+}