epoll file descriptor by requesting the kernel allocate
an event backing store dimensioned for
size descriptors. The
size is not the maximum size of the backing store but
just a hint to the kernel about how to dimension internal structures.
The returned file descriptor will be used for all the subsequent calls to the
epoll interface. The file descriptor returned by
must be closed by using
returns a non-negative integer identifying the descriptor.
When an error occurs,
returns -1 and
errno is set appropriately.
size is not positive.
The system limit on the total number of open files has been reached.
There was insufficient memory to create the kernel object.
is a new API introduced in Linux kernel 2.5.44.
The interface should be finalized by Linux kernel 2.5.66.