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
| Name | Description |
|---|---|
| epoll_create | Create new epoll file descriptor |
| epoll_wait | Wait for an event on an epoll file descriptor. |
| fpClose | Close file descriptor |