epoll_create - open an epoll file descriptor
#include <sys/epoll.h>
Open an epoll file descriptor by requesting the kernel to 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 epoll_create () must be closed by using close (2).
When successful, epoll_create () returns a non-negative integer identifying the descriptor. When an error occurs, epoll_create () returns -1 and errno is set appropriately.
EINVAL size is not positive.
ENFILE The system limit on the total number of open files has been reached.
ENOMEM There was insufficient memory to create the kernel object.
epoll_create () is Linux-specific, and was introduced in kernel 2.5.44.
close (2) epoll_ctl (2) epoll_wait (2) epoll (7)
