comparison audioDB-internals.h @ 563:c6036e0a511a

Work around the non-universality of fdatasync()

POSIX, which specifies fdatasync(), also apparently specifies that
POSIX_SYNCHRONIZED_IO is defined to a non-zero value if fdatasync() is
available -- or at least that's what the man page suggests on Linux.
This is probably good enough for us, anyway.

+#include <sys/types.h>
+#include <unistd.h>
+
 #include <set>
 #include <queue>
 #include <map>
 #include <string>
 #include <algorithm>

   }
   if(write(adb->fd, adb->header, ADB_HEADER_SIZE) != ADB_HEADER_SIZE) {
     goto error;
   }
 
-  /* can be fsync() if fdatasync() is racily exciting and new */
+#if defined(_POSIX_SYNCHRONIZED_IO) && (_POSIX_SYNCHRONIZED_IO > 0)
   fdatasync(adb->fd);
+#else
+  fsync(adb->fd);
+#endif
   if(lseek(adb->fd, pos, SEEK_SET) == (off_t) -1) {
     goto error;
   }
   return 0;