epoll_ctl

Modify an epoll file descriptor

Declaration

Source position: linux.pp line 297

  function epoll_ctl(epfd: cint; op: cint; fd: cint; event: PEpoll_Event)
                     : cint;

Description

epoll_ctl performs the op operation on epoll file descriptor epfd. The operation will be monitored on file descriptor fd, and is optionally controlled by event.

op can be one of the following values:

EPOLL_CTL_ADD

Add filedescriptor to list of events

EPOLL_CTL_MOD

Modify event for filedescriptor

EPOLL_CTL_DEL

Delete event for filedescriptor

The events field in event_data is a bitmask of one or more of the following values:

EPOLLIN

The file is ready for read operations

EPOLLOUT

The file is ready for write operations.

EPOLLPRI

Urgent data is available for read operations.

EPOLLERR

An error condition is signaled on the file descriptor.

EPOLLHUP

A Hang up happened on the file descriptor.

EPOLLET

Set the Edge Triggered behaviour for the file descriptor.

EPOLLONESHOT

Set One-Shot behaviour for the file descriptor. The event will be triggered only once.

Errors

On error -1 is returned, and errno is set accordingly.

See also