1IPCCTL_PRE_DOWN(9)           Kernel IPC facilities          IPCCTL_PRE_DOWN(9)
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NAME

6       ipcctl_pre_down - retrieve an ipc and check permissions for some
7       IPC_XXX cmd
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SYNOPSIS

10       struct kern_ipc_perm * ipcctl_pre_down(struct ipc_ids * ids, int id,
11                                              int cmd,
12                                              struct ipc64_perm * perm,
13                                              int extra_perm);
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ARGUMENTS

16       ids
17           the table of ids where to look for the ipc
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19       id
20           the id of the ipc to retrieve
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22       cmd
23           the cmd to check
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25       perm
26           the permission to set
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28       extra_perm
29           one extra permission parameter used by msq
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DESCRIPTION

32       This function does some common audit and permissions check for some
33       IPC_XXX cmd and is called from semctl_down, shmctl_down and
34       msgctl_down. It must be called without any lock held and - retrieves
35       the ipc with the given id in the given table. - performs some audit and
36       permission check, depending on the given cmd - returns the ipc with
37       both ipc and rw_mutex locks held in case of success or an err-code
38       without any lock held otherwise.
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41Kernel Hackers Manual 2.6.       November 2011              IPCCTL_PRE_DOWN(9)
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