sem_obtain_object_check

Name:sem_obtain_object_check

Proto:static inline struct sem_array *sem_obtain_object_check(struct ipc_namespace *ns, int id)

Type:struct sem_array

Parameter:

Type	Parameter	Name
struct ipc_namespace *	ns
int	id

469

ipcp = pc_obtain_object_check*@ids: ipc identifier set*@id: ipc id to look for* Similar to ipc_obtain_object_idr() but also checks the ipc object* sequence number.* Call inside the RCU critical section.* The ipc object is *not* locked on exit.

471

If IS_ERR(ipcp) Then Return ERR_CAST - Explicitly cast an error-valued pointer to another pointer type*@ptr: The pointer to cast.* Explicitly cast an error-valued pointer to another pointer type in such a* way as to make it clear that's what's going on.

474

Return container_of - cast a member of a structure out to the containing structure*@ptr: the pointer to the member.*@type: the type of the container struct this is embedded in.*@member: the name of the member within the struct.(ipcp, structsem_array, sem_perm)

**Caller**
Name	Describe
semctl_stat
semctl_setval
semctl_main
find_alloc_undo	d_alloc_undo - lookup (and if not present create) undo array@ns: namespace@semid: semaphore array id* The function looks up (and if not present creates) the undo structure.* The size of the undo structure depends on the size of the semaphore
do_semtimedop
exit_sem	add semadj values to semaphores, free undo structures

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