[PATCH 4/5] server: Introduce is_fd_synchronous helper.

[Jacek Caban]

Signed-off-by: Jacek Caban 
---
 server/fd.c   | 10 ++++++++--
 server/file.c |  7 +------
 server/file.h |  1 +
 3 files changed, 10 insertions(+), 8 deletions(-)