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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | VERSIONS | STANDARDS | SEE ALSO | COLOPHON |
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epoll_event(3type) epoll_event(3type)
epoll_event, epoll_data, epoll_data_t - epoll event
Standard C library (libc)
#include <sys/epoll.h>
struct epoll_event {
uint32_t events; /* Epoll events */
epoll_data_t data; /* User data variable */
};
union epoll_data {
void *ptr;
int fd;
uint32_t u32;
uint64_t u64;
};
typedef union epoll_data epoll_data_t;
The epoll_event structure specifies data that the kernel should
save and return when the corresponding file descriptor becomes
ready.
C library/kernel differences
The Linux kernel headers also provide this type, with a slightly
different definition:
#include <linux/eventpoll.h>
struct epoll_event {
__poll_t events;
__u64 data;
};
Linux.
epoll_wait(2), epoll_ctl(2)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.15.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2025-08-11. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
[email protected]
Linux man-pages 6.15 2025-05-17 epoll_event(3type)
Pages that refer to this page: epoll_ctl(2), epoll_wait(2)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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