ep_alloc

Name:ep_alloc

Proto:static int ep_alloc(struct eventpoll **pep)

Type:int

Parameter:

Type	Parameter	Name
struct eventpoll **	pep

998

user = get_current_user - Get the current task's user_struct* Get the user record of the current task, pinning it so that it can't go* away.()

999

error = -ENOMEM

1000

ep = kzalloc - allocate memory. The memory is set to zero.*@size: how many bytes of memory are required.*@flags: the type of memory to allocate (see kmalloc).

1001

If Value for the false possibility is greater at compile time(!ep) Then Go to free_uid

1004

mutex_init - initialize the mutex*@mutex: the mutex to be initialized* Initialize the mutex to unlocked state.* It is not allowed to initialize an already locked mutex.( & * This mutex is used to ensure that files are not removed * while epoll is using them. This is held during the event * collection loop, the file cleanup path, the epoll file exit * code and the ctl operations.)

1005

rwlock_init( & Lock which protects rdllist and ovflist )

1006

init_waitqueue_head( & Wait queue used by sys_epoll_wait() )

1007

init_waitqueue_head( & Wait queue used by file->poll() )

1008

Initialization list head

1009

RB tree root used to store monitored fd structs =

1010

* This is a single linked list that chains all the "struct epitem" that * happened while transferring ready events to userspace w/out * holding ->lock. = EP_UNACTIVE_PTR

1011

The user that created the eventpoll descriptor = user

1013

pep = ep

1015

Return 0

1017

1018

1019

Return error

**Caller**
Name	Describe
do_epoll_create	Open an eventpoll file descriptor.

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