Am 30.05.2011 um 00:22 schrieb Alexandre Raymond:
Under darwin (OS X 10.6.7), a symbol exists for the fdatasync() method
but it is not supported because _POSIX_SYNCHRONIZED_IO is set to '-1'.
Question: How did you notice? Did anything break that we could
mention, or did you just review the code?
Enable fdatasync() only if _POSIX_SYNCHRONIZED_IO is '>0', as per
The Open Group Base Specifications Issue 7.
Not quite what I meant. ;) Would you be okay with the following:
configure: Fix check for fdatasync()
Under Darwin, a symbol exists for the fdatasync() function, but it is
not supported. Yada yada. _POSIX_SYNCHRONIZED_IO is set to '-1'.
According to POSIX:2008, a value of -1 means the feature is not
supported.
A value of 0 means supported at compilation time, and a value greater 0
means supported at both compilation and run time.
Enable fdatasync() only if _POSIX_SYNCHRONIZED_IO is '>0'.
Andreas
Signed-off-by: Alexandre Raymond <cerb...@gmail.com>
---
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
