IPCCTL_PRE_DOWN_NOLO(9) Kernel IPC facilities IPCCTL_PRE_DOWN_NOLO(9)NAME
ipcctl_pre_down_nolock - retrieve an ipc and check permissions for some IPC_XXX cmd
struct kern_ipc_perm * ipcctl_pre_down_nolock(struct ipc_namespace * ns, struct ipc_ids * ids, int id, int cmd, struct ipc64_perm * perm,
the ipc namespace
the table of ids where to look for the ipc
the id of the ipc to retrieve
the cmd to check
the permission to set
one extra permission parameter used by msq
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.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 IPCCTL_PRE_DOWN_NOLO(9)
Check Out this Related Man Page
IPC(2) Linux Programmer's Manual IPC(2)NAME
ipc - System V IPC system calls
int ipc(unsigned int call, int first, int second, int third,
void *ptr, long fifth);
ipc() is a common kernel entry point for the System V IPC calls for messages, semaphores, and shared memory. call determines which IPC
function to invoke; the other arguments are passed through to the appropriate call.
User programs should call the appropriate functions by their usual names. Only standard library implementors and kernel hackers need to
know about ipc().
ipc() is Linux-specific, and should not be used in programs intended to be portable.
On some architectures--for example x86-64 and ARM--there is no ipc() system call; instead msgctl(2), semctl(2), shmctl(2), and so on really
are implemented as separate system calls.
SEE ALSO msgctl(2), msgget(2), msgrcv(2), msgsnd(2), semctl(2), semget(2), semop(2), semtimedop(2), shmat(2), shmctl(2), shmdt(2), shmget(2)COLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
Linux 2012-10-16 IPC(2)
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