IPCCTL_PRE_DOWN

NAME

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.  

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