table of contents
| 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¶
| May 2024 | Kernel Hackers Manual 2.6. |