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[Qemu-devel] [PATCHv2] Add compat eventfd header
From: |
Michael S. Tsirkin |
Subject: |
[Qemu-devel] [PATCHv2] Add compat eventfd header |
Date: |
Thu, 30 Jun 2011 18:57:26 +0300 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
Support build on rhel 5.X where we have syscall for eventfd but not
userspace wrapper.
(cherry-picked from commit 9e3269181e9bc56feb43bcd4e8ce0b82cd543e65
in qemu-kvm.git).
Signed-off-by: Michael S. Tsirkin <address@hidden>
---
Changes from v1:
checkpatch fix
address comments by agraf
verify we are on linux
compat/sys/eventfd.h | 20 ++++++++++++++++++++
configure | 6 ++++--
2 files changed, 24 insertions(+), 2 deletions(-)
create mode 100644 compat/sys/eventfd.h
diff --git a/compat/sys/eventfd.h b/compat/sys/eventfd.h
new file mode 100644
index 0000000..1801a5f
--- /dev/null
+++ b/compat/sys/eventfd.h
@@ -0,0 +1,20 @@
+#ifndef _COMPAT_SYS_EVENTFD
+#define _COMPAT_SYS_EVENTFD
+
+#ifdef CONFIG_EVENTFD
+
+#ifndef __linux__
+#error __linux__ is not defined: eventfd is only supported on linux
+#endif
+
+#include <unistd.h>
+#include <syscall.h>
+
+static inline int eventfd(int count, int flags)
+{
+ return syscall(SYS_eventfd, count, flags);
+}
+
+#endif
+
+#endif
diff --git a/configure b/configure
index 856b41e..6f7dd74 100755
--- a/configure
+++ b/configure
@@ -822,7 +822,6 @@ esac
[ -z "$guest_base" ] && guest_base="$host_guest_base"
-
default_target_list=""
# these targets are portable
@@ -891,6 +890,9 @@ sparc64-bsd-user \
"
fi
+#compat headers
+QEMU_CFLAGS="$QEMU_CFLAGS -idirafter $source_path/compat"
+
if test x"$show_help" = x"yes" ; then
cat << EOF
@@ -2122,7 +2124,7 @@ int main(void)
return 0;
}
EOF
-if compile_prog "" "" ; then
+if compile_prog "-DCONFIG_EVENTFD" "" ; then
eventfd=yes
fi
--
1.7.5.53.gc233e
- [Qemu-devel] [PATCHv2] Add compat eventfd header,
Michael S. Tsirkin <=