suse man page for ipcctl_pre_down

IPCCTL_PRE_DOWN(9)					       Kernel IPC facilities						IPCCTL_PRE_DOWN(9)

NAME
       ipcctl_pre_down - retrieve an ipc and check permissions for some IPC_XXX cmd

SYNOPSIS
       struct kern_ipc_perm * ipcctl_pre_down(struct ipc_ids * ids, int id, int cmd, struct ipc64_perm * perm, int extra_perm);

ARGUMENTS
       ids
	   the table of ids where to look for the ipc

       id
	   the id of the ipc to retrieve

       cmd
	   the cmd to check

       perm
	   the permission to set

       extra_perm
	   one extra permission parameter used by msq

DESCRIPTION
       This function does some common audit and permissions check for some IPC_XXX cmd and is called from semctl_down, shmctl_down and
       msgctl_down. It must be called without any lock held and - retrieves the ipc with the given id in the given table. - performs some audit
       and permission check, depending on the given cmd - returns the ipc with both ipc and rw_mutex locks held in case of success or an err-code
       without any lock held otherwise.

COPYRIGHT
Kernel Hackers Manual 2.6.					     July 2010							IPCCTL_PRE_DOWN(9)