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