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[Qemu-devel] [PATCH 1/6] Fix incorrect check for fdatasync() in configur
From: |
Alexandre Raymond |
Subject: |
[Qemu-devel] [PATCH 1/6] Fix incorrect check for fdatasync() in configure |
Date: |
Fri, 27 May 2011 13:22:26 -0400 |
For some reason, darwin provides a symbol for fdatasync(), but
doesn't officially support it.
The manpage for fdatasync on Linux states the following:
"On POSIX systems on which fdatasync() is available,
_POSIX_SYNCHRONIZED_IO is defined in <unistd.h> to a value greater than 0."
In fact, unistd.h defines this value to "-1", at least on OSX 10.6.7.
Add this check to the configure file.
Signed-off-by: Alexandre Raymond <address@hidden>
---
configure | 8 +++++++-
1 files changed, 7 insertions(+), 1 deletions(-)
diff --git a/configure b/configure
index a318d37..b21ef75 100755
--- a/configure
+++ b/configure
@@ -2477,7 +2477,13 @@ fi
fdatasync=no
cat > $TMPC << EOF
#include <unistd.h>
-int main(void) { return fdatasync(0); }
+int main(void) {
+#if defined(_POSIX_SYNCHRONIZED_IO) && _POSIX_SYNCHRONIZED_IO > 0
+return fdatasync(0);
+#else
+#abort Not supported
+#endif
+}
EOF
if compile_prog "" "" ; then
fdatasync=yes
--
1.7.5