First of several commits to allow kernel System V IPC data structures

to be modified and extended without breaking the user space ABI:

Define _kernel wrapper data structures for the user-exposed data
structures that current server as the internal data structures for
the implementation:

- struct msqid_kernel wraps struct msqid_ds.
- struct semid_kernel wraps truct semid_ds.
- struct shmid_kernel wraps struct shmid_ds.
- Don't expose extern definition 'shmsegs' outside of sysv_shm.c.

Submitted by:	Dandekar Hrishikesh <rishi_dandekar at sbcglobal dot net>
Obtained from:	TrustedBSD Project
Sponsored by:	DARPA, SPAWAR, McAfee Research

1 files changed, 9 insertions, 1 deletions

diff --git a/sys/sys/shm.h b/sys/sys/shm.h
index a56e40d..07ae3a6 100644
--- a/sys/sys/shm.h
+++ b/sys/sys/shm.h
@@ -83,8 +83,16 @@ struct shminfo {
 		shmseg,		/* max shared memory segments per process */
 		shmall;		/* max amount of shared memory (pages) */
 };
+
+/* 
+ * Add a kernel wrapper to the shmid_ds struct so that private info (like the
+ * MAC label) can be added to it, without changing the user interface.
+ */
+struct shmid_kernel {
+	struct shmid_ds u;
+};
+
 extern struct shminfo	shminfo;
-extern struct shmid_ds	*shmsegs;
 
 struct shm_info {
 	int used_ids;