epoll_ctl function

Declaration

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

• epoll_create
• epoll_wait
• fpClose