Function report

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:ipc\sem.c Create Date:2022-07-28 16:43:28
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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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:

TypeParameterName
struct ipc_namespace *ns
intid
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
NameDescribe
semctl_stat
semctl_setval
semctl_main
find_alloc_undod_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_semadd semadj values to semaphores, free undo structures