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.
This type is Linux-specific.
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;
};
epoll_wait(2),
epoll_ctl(7)