[PATCH.HURD] fix fdatasync/fsync if file_sync is not supported

[Pino Toscano <toscano dot pino at tiscali dot it>]

Hi,

Hurd's implementations of fdatasync and fsync do not take into account 
the fact that file_sync could not be implemented in the receiving port, 
or implemented as stub, returning (E)MIG_BAD_ID or EOPNOTSUPP.
Attached there is a patch to normalize them to EINVAL, as specified by 
POSIX.

Thanks,
-- 
Pino Toscano

Hurd: fix fdatasync/fsync if the fd does not support file_sync

Handle the case of the fd port not implementing file_sync (returning MIG_BAD_ID) or implementing a stub (EOPNOTSUPP),
properly returning EINVAL.

2012-08-29  Pino Toscano  <toscano.pino@tiscali.it>

	* sysdeps/mach/hurd/fdatasync.c: Turn ERR into EINVAL if it is
	MIG_BAD_ID or EOPNOTSUPP.
	* sysdeps/mach/hurd/fsync.c: Likewise.
--- a/sysdeps/mach/hurd/fdatasync.c
+++ b/sysdeps/mach/hurd/fdatasync.c
@@ -26,6 +26,10 @@ fdatasync (int fd)
 {
   error_t err = HURD_DPORT_USE (fd, __file_sync (port, 1, 1));
   if (err)
-    return __hurd_dfail (fd, err);
+    {
+      if (err == MIG_BAD_ID || err == EOPNOTSUPP)
+	err = EINVAL;
+      return __hurd_dfail (fd, err);
+    }
   return 0;
 }
--- a/sysdeps/mach/hurd/fsync.c
+++ b/sysdeps/mach/hurd/fsync.c
@@ -27,6 +27,10 @@ fsync (fd)
 {
   error_t err = HURD_DPORT_USE (fd, __file_sync (port, 1, 0));
   if (err)
-    return __hurd_dfail (fd, err);
+    {
+      if (err == MIG_BAD_ID || err == EOPNOTSUPP)
+	err = EINVAL;
+      return __hurd_dfail (fd, err);
+    }
   return 0;
 }

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