ipc_lock_down(9)
NAME
ipc_lock_down - Lock an ipc structure with rw_sem held
SYNOPSIS
struct kern_ipc_perm * ipc_lock_down(struct ipc_ids * ids, int id);
ARGUMENTS
- ids
- IPC identifier set
- id
- ipc id to look for
DESCRIPTION
Look for an id in the ipc ids idr and lock the associated ipc object.
The ipc object is locked on exit.
This is the routine that should be called when the rw_mutex is already
held, i.e. idr tree protected.