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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
This commit is contained in:
Szabolcs Nagy 2014-10-01 22:25:40 +02:00 committed by Rich Felker
parent a0c90b9773
commit a3763d64e0
1 changed files with 7 additions and 0 deletions
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7
include/fcntl.h
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@ -121,6 +121,13 @@ int posix_fallocate(int, off_t, off_t);
#define F_CANCELLK 1029 #define F_CANCELLK 1029
#define F_SETPIPE_SZ 1031 #define F_SETPIPE_SZ 1031
#define F_GETPIPE_SZ 1032 #define F_GETPIPE_SZ 1032
#define F_ADD_SEALS 1033
#define F_GET_SEALS 1034
#define F_SEAL_SEAL 0x0001
#define F_SEAL_SHRINK 0x0002
#define F_SEAL_GROW 0x0004
#define F_SEAL_WRITE 0x0008
#define DN_ACCESS 0x00000001 #define DN_ACCESS 0x00000001
#define DN_MODIFY 0x00000002 #define DN_MODIFY 0x00000002