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

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

10       struct kern_ipc_perm *
11                                                     ipcctl_pre_down_nolock(struct ipc_namespace * ns,
12                                                     struct ipc_ids * ids,
13                                                     int id, int cmd,
14                                                     struct ipc64_perm * perm,
15                                                     int extra_perm);
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ARGUMENTS

18       ns
19           the ipc namespace
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21       ids
22           the table of ids where to look for the ipc
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24       id
25           the id of the ipc to retrieve
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27       cmd
28           the cmd to check
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30       perm
31           the permission to set
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33       extra_perm
34           one extra permission parameter used by msq
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DESCRIPTION

37       This function does some common audit and permissions check for some
38       IPC_XXX cmd and is called from semctl_down, shmctl_down and
39       msgctl_down. It must be called without any lock held and - retrieves
40       the ipc with the given id in the given table. - performs some audit and
41       permission check, depending on the given cmd - returns a pointer to the
42       ipc object or otherwise, the corresponding error.
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44       Call holding the both the rwsem and the rcu read lock.
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47Kernel Hackers Manual 3.10         June 2019           IPCCTL_PRE_DOWN_NOLO(9)
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