From: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date: Mon, 21 Nov 2016 19:40:19 +0000 (-0200)
Subject: Consolidate Linux epoll_wait syscall
X-Git-Tag: glibc-2.26~559
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b62c3815912bc679a966134affdedd3f35ae8621;p=thirdparty%2Fglibc.git

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.
---

diff --git a/ChangeLog b/ChangeLog
index a48b9fb7d91..fa61e5fdb7b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,14 @@
 2016-04-03  Adhemerval Zanella  <adhemerval.zanella@linaro.org>
 
+	* 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.
+	* sysdeps/unix/sysv/linux/Makefile (sysdep_routines): Add
+	epoll_wait.
+	* sysdeps/unix/sysv/linux/generic/Makefile (sysdep_routines):
+	Remove epoll_wait.
+
 	* sysdeps/unix/sysv/linux/alpha/Makefile (sysdep_routines): Add
 	osf_select.
 	* sysdeps/unix/sysv/linux/alpha/select.c: New file.
diff --git a/sysdeps/unix/sysv/linux/Makefile b/sysdeps/unix/sysv/linux/Makefile
index 1872cdb1799..a8790b1e51d 100644
--- a/sysdeps/unix/sysv/linux/Makefile
+++ b/sysdeps/unix/sysv/linux/Makefile
@@ -17,7 +17,7 @@ include $(firstword $(wildcard $(sysdirs:=/sysctl.mk)))
 sysdep_routines += clone umount umount2 readahead \
 		   setfsuid setfsgid epoll_pwait signalfd \
 		   eventfd eventfd_read eventfd_write prlimit \
-		   personality
+		   personality epoll_wait
 
 CFLAGS-gethostid.c = -fexceptions
 CFLAGS-tst-writev.c += "-DARTIFICIAL_LIMIT=(0x80000000-sysconf(_SC_PAGESIZE))"
diff --git a/sysdeps/unix/sysv/linux/generic/epoll_wait.c b/sysdeps/unix/sysv/linux/epoll_wait.c
similarity index 82%
rename from sysdeps/unix/sysv/linux/generic/epoll_wait.c
rename to sysdeps/unix/sysv/linux/epoll_wait.c
index d9363f1d8d3..eb6e6d3ace8 100644
--- a/sysdeps/unix/sysv/linux/generic/epoll_wait.c
+++ b/sysdeps/unix/sysv/linux/epoll_wait.c
@@ -1,6 +1,6 @@
-/* Copyright (C) 2011-2017 Free Software Foundation, Inc.
+/* Linux epoll_wait syscall implementation.
+   Copyright (C) 2017 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
-   Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
 
    The GNU C Library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
@@ -24,5 +24,9 @@
 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
 }
diff --git a/sysdeps/unix/sysv/linux/generic/Makefile b/sysdeps/unix/sysv/linux/generic/Makefile
index c1daee23962..7e27e797726 100644
--- a/sysdeps/unix/sysv/linux/generic/Makefile
+++ b/sysdeps/unix/sysv/linux/generic/Makefile
@@ -1,3 +1,3 @@
 ifeq ($(subdir),misc)
-sysdep_routines += epoll_create epoll_wait inotify_init
+sysdep_routines += epoll_create inotify_init
 endif
diff --git a/sysdeps/unix/sysv/linux/syscalls.list b/sysdeps/unix/sysv/linux/syscalls.list
index 4d550b8804e..1a1090311c0 100644
--- a/sysdeps/unix/sysv/linux/syscalls.list
+++ b/sysdeps/unix/sysv/linux/syscalls.list
@@ -12,7 +12,6 @@ delete_module	EXTRA	delete_module	3	delete_module
 epoll_create	EXTRA	epoll_create	i:i	epoll_create
 epoll_create1	EXTRA	epoll_create1	i:i	epoll_create1
 epoll_ctl	EXTRA	epoll_ctl	i:iiip	epoll_ctl
-epoll_wait	EXTRA	epoll_wait	Ci:ipii	epoll_wait
 eventfd		EXTRA	eventfd2	i:ii	eventfd
 execve		-	execve		i:spp	__execve	execve
 fdatasync	-	fdatasync	Ci:i	fdatasync