epoll_create1 - Linux
Overview
The epoll_create1
command in Linux creates an epoll instance, which is a data structure used for efficient, event-based I/O processing. It is used for monitoring file descriptors, sockets, and similar resources for events like data availability or connection changes.
Syntax
int epoll_create1(int flags);
Options/Flags
- EPOLL_CLOEXEC: Sets the close-on-exec flag on the new file descriptor.
Examples
Create a basic epoll instance:
int epollfd = epoll_create1(0);
Create an epoll instance with the close-on-exec flag:
int epollfd = epoll_create1(EPOLL_CLOEXEC);
Common Issues
- Using
epoll_create1
without appropriate error handling can lead to errors if the creation fails. - Mixing
epoll_create1
with other epoll functions likeepoll_ctl
orepoll_wait
from different epoll implementations can cause inconsistent behavior.
Integration
epoll_create1
is commonly used with other Linux commands and tools for asynchronous I/O processing. For example, it can be combined with:
- epoll_ctl: To add or modify file descriptors in the epoll instance.
- epoll_wait: To wait for events on the registered file descriptors.
- select: For a more traditional I/O event monitoring approach.
Related Commands
- epoll_ctl: Controls (adds, modifies, or deletes) file descriptors in an epoll instance.
- epoll_wait: Waits for events on a set of file descriptors in an epoll instance.
- poll: Another function for event-based I/O monitoring.