ipcctl_pre_down_nolock (9) - Linux Manuals

ipcctl_pre_down_nolock: retrieve an ipc and check permissions for some IPC_XXX cmd

Command to display ipcctl_pre_down_nolock manual in Linux: $ man 9 ipcctl_pre_down_nolock

NAME

ipcctl_pre_down_nolock - retrieve an ipc and check permissions for some IPC_XXX cmd

SYNOPSIS

struct kern_ipc_perm * ipcctl_pre_down_nolock(struct ipc_namespace * ns, struct ipc_ids * ids, int id, int cmd, struct ipc64_perm * perm, int extra_perm);

ARGUMENTS

: ipc namespace

ids

: the table of ids where to look for the ipc

: 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 a pointer to the ipc object or otherwise, the corresponding error.

Call holding the both the rwsem and the rcu read lock.