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.\" Copyright (c) 2022 by Alejandro Colomar <alx@kernel.org>
.\"
.\" SPDX-License-Identifier: Linux-man-pages-copyleft
.\"
.\"
.TH epoll_event 3type (date) "Linux man-pages (unreleased)"
.SH NAME
epoll_event, epoll_data, epoll_data_t
\- epoll event
.SH LIBRARY
Standard C library
.RI ( libc )
.SH SYNOPSIS
.EX
.B #include <sys/epoll.h>
.P
.B struct epoll_event {
.BR " uint32_t events;" " /* Epoll events */"
.BR " epoll_data_t data;" " /* User data variable */"
.B };
.P
.B union epoll_data {
.B " void *ptr;"
.B " int fd;"
.B " uint32_t u32;"
.B " uint64_t u64;"
.B };
.P
.B "typedef union epoll_data epoll_data_t;"
.EE
.SH DESCRIPTION
The
.I epoll_event
structure specifies data that the kernel should save and
return when the corresponding file descriptor becomes ready.
.SH VERSIONS
.SS C library/kernel differences
The Linux kernel headers also provide this type,
with a slightly different definition:
.P
.in +4n
.EX
#include <linux/eventpoll.h>
\&
struct epoll_event {
__poll_t events;
__u64 data;
};
.EE
.in
.SH STANDARDS
Linux.
.SH SEE ALSO
.BR epoll_wait (2),
.BR epoll_ctl (2)
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