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From 95d82acc57bb7d8bae431f7a6ce0707aac3ef33f Mon Sep 17 00:00:00 2001
From: Rosen Penev <rosenp@gmail.com>
Date: Thu, 5 Sep 2019 19:41:13 -0700
Subject: [PATCH] Use eventfd() function with uClibc
The Boost eventfd code either directly makes the eventfd system call
using __NR_eventfd (when __GLIBC_MINOR is less than 8), or otherwise
uses the eventfd() function provided by the C library.
However, since uClibc pretends to be glibc 2.2, the Boost eventfd code
directly uses the system call. While it works fine on most
architectures, it doesn't on ARC since __NR_eventfd is not defined on
this architecture. However, eventfd() is properly implemented.
So, this patch adjusts the logic used by Boost to consider uClibc as a
C library providing the eventfd() function.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Rosen Penev <rosenp@gmail.com>
---
a/boost/asio/detail/impl/eventfd_select_interrupter.ipp | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
diff --git a/boost/asio/detail/impl/eventfd_select_interrupter.ipp b/boost/asio/detail/impl/eventfd_select_interrupter.ipp
index 38d4b2a61..e16cc8b00 100644
--- a/boost/asio/detail/impl/eventfd_select_interrupter.ipp
+++ b/boost/asio/detail/impl/eventfd_select_interrupter.ipp
@@ -23,11 +23,11 @@
#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>
-#if __GLIBC__ == 2 && __GLIBC_MINOR__ < 8
+#if __GLIBC__ == 2 && __GLIBC_MINOR__ < 2
# include <asm/unistd.h>
-#else // __GLIBC__ == 2 && __GLIBC_MINOR__ < 8
+#else // __GLIBC__ == 2 && __GLIBC_MINOR__ < 2
# include <sys/eventfd.h>
-#endif // __GLIBC__ == 2 && __GLIBC_MINOR__ < 8
+#endif // __GLIBC__ == 2 && __GLIBC_MINOR__ < 2
#include <boost/asio/detail/cstdint.hpp>
#include <boost/asio/detail/eventfd_select_interrupter.hpp>
#include <boost/asio/detail/throw_error.hpp>
@@ -46,14 +46,14 @@ eventfd_select_interrupter::eventfd_select_interrupter()
void eventfd_select_interrupter::open_descriptors()
{
-#if __GLIBC__ == 2 && __GLIBC_MINOR__ < 8
+#if __GLIBC__ == 2 && __GLIBC_MINOR__ < 2
write_descriptor_ = read_descriptor_ = syscall(__NR_eventfd, 0);
if (read_descriptor_ != -1)
{
::fcntl(read_descriptor_, F_SETFL, O_NONBLOCK);
::fcntl(read_descriptor_, F_SETFD, FD_CLOEXEC);
}
-#else // __GLIBC__ == 2 && __GLIBC_MINOR__ < 8
+#else // __GLIBC__ == 2 && __GLIBC_MINOR__ < 2
# if defined(EFD_CLOEXEC) && defined(EFD_NONBLOCK)
write_descriptor_ = read_descriptor_ =
::eventfd(0, EFD_CLOEXEC | EFD_NONBLOCK);
@@ -70,7 +70,7 @@ void eventfd_select_interrupter::open_descriptors()
::fcntl(read_descriptor_, F_SETFD, FD_CLOEXEC);
}
}
-#endif // __GLIBC__ == 2 && __GLIBC_MINOR__ < 8
+#endif // __GLIBC__ == 2 && __GLIBC_MINOR__ < 2
if (read_descriptor_ == -1)
{