[Overview][Constants][Types][Procedures and functions][Index] Reference for unit 'Linux' (#rtl)

epoll_ctl

Modify an epoll file descriptor

Declaration

Source position: linux.pp line 248

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

  

Create new epoll file descriptor

epoll_wait

  

Wait for an event on an epoll file descriptor.

fpClose

  

Close file descriptor
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