add new linux file sealing api to fcntl.h
authorSzabolcs Nagy <nsz@port70.net>
Wed, 1 Oct 2014 20:25:40 +0000 (22:25 +0200)
committerRich Felker <dalias@aerifal.cx>
Wed, 8 Oct 2014 15:39:28 +0000 (11:39 -0400)
commita3763d64e0d65ed1902b36c521c57cd252b9c3be
tree2b5d6e63779baaa524829e065d57ded57c4990ce
parenta0c90b9773bd9b5b6faa7a657e22794c1e643989
add new linux file sealing api to fcntl.h

new in linux v3.17 commit 40e041a2c858b3caefc757e26cb85bfceae5062b
sealing allows some operations to be blocked on a file which makes
file access safer when fds are shared between processes (only
supported for shared mem fds currently)

flags:
F_SEAL_SEAL prevents further sealing
F_SEAL_SHRINK prevents file from shrinking
F_SEAL_GROW prevents file from growing
F_SEAL_WRITE prevents writes

fcntl commands:
F_GET_SEALS get the current seal flags
F_ADD_SEALS add new seal flags
include/fcntl.h