From 3be57dc4a30f1a4b059fec4bd7e46ae03d3c7107 Mon Sep 17 00:00:00 2001
From: Max Kellermann <max@duempel.org>
Date: Wed, 9 Jan 2013 23:01:04 +0100
Subject: fd_util: support eventfd()

---
 configure.ac  |  2 +-
 src/fd_util.c | 14 ++++++++++++++
 src/fd_util.h | 11 +++++++++++
 3 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 9ade4bdf..cdc23604 100644
--- a/configure.ac
+++ b/configure.ac
@@ -133,7 +133,7 @@ AC_SEARCH_LIBS([syslog], [bsd socket inet],
 AC_SEARCH_LIBS([socket], [socket])
 AC_SEARCH_LIBS([gethostbyname], [nsl])
 
-AC_CHECK_FUNCS(pipe2 accept4)
+AC_CHECK_FUNCS(pipe2 accept4 eventfd)
 
 AC_SEARCH_LIBS([exp], [m],,
 	[AC_MSG_ERROR([exp() not found])])
diff --git a/src/fd_util.c b/src/fd_util.c
index 882b4c7d..ea29d6ea 100644
--- a/src/fd_util.c
+++ b/src/fd_util.c
@@ -49,6 +49,10 @@
 #include <sys/inotify.h>
 #endif
 
+#ifdef HAVE_EVENTFD
+#include <sys/eventfd.h>
+#endif
+
 #ifndef WIN32
 
 static int
@@ -328,6 +332,16 @@ inotify_init_cloexec(void)
 
 #endif
 
+#ifdef HAVE_EVENTFD
+
+int
+eventfd_cloexec_nonblock(unsigned initval, int flags)
+{
+	return eventfd(initval, flags | EFD_CLOEXEC | EFD_NONBLOCK);
+}
+
+#endif
+
 int
 close_socket(int fd)
 {
diff --git a/src/fd_util.h b/src/fd_util.h
index c8a17c7e..e65c6a69 100644
--- a/src/fd_util.h
+++ b/src/fd_util.h
@@ -144,6 +144,17 @@ inotify_init_cloexec(void);
 
 #endif
 
+#ifdef HAVE_EVENTFD
+
+/**
+ * Wrapper for eventfd() which sets the flags CLOEXEC and NONBLOCK
+ * flag (atomically if supported by the OS).
+ */
+int
+eventfd_cloexec_nonblock(unsigned initval, int flags);
+
+#endif
+
 /**
  * Portable wrapper for close(); use closesocket() on WIN32/WinSock.
  */
-- 
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