do_eventfd

Name:do_eventfd

Proto:static int do_eventfd(unsigned int count, int flags)

Type:int

Parameter:

Type	Parameter	Name
unsigned int	count
int	flags

412

BUILD_BUG_ON - break compile if a condition is true(EFD_CLOEXEC != O_CLOEXEC)

413

BUILD_BUG_ON - break compile if a condition is true(EFD_NONBLOCK != O_NONBLOCK)

415

If flags & ~EFD_FLAGS_SET Then Return -EINVAL

418

ctx = Allocation memory

419

If Not ctx Then Return -ENOMEM

422

kref_init - initialize object.*@kref: object in question.

423

init_waitqueue_head( & wqh)

424

* Every time that a write(2) is performed on an eventfd, the * value of the __u64 being written is added to "count" and a * wakeup is performed on "wqh". A read(2) will return the "count" * value to userspace, and will reset "count" to zero. The kernel * s = count

425

426

id = ida_simple_get( & eventfd_ida, 0, 0, GFP_KERNEL)

428

fd = anon_inode_getfd - creates a new file instance by hooking it up to an* anonymous inode, and a dentry that describe the "class"* of the file*@name: [in] name of the "class" of the new file*@fops: [in] file operations for the new file*@priv: [in] private

430

If fd < 0 Then eventfd_free_ctx(ctx)

433

Return fd

**Caller**
Name	Describe
SYSCALL_DEFINE2
SYSCALL_DEFINE1

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