1epoll_event(3type) epoll_event(3type)
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6 epoll_event, epoll_data, epoll_data_t - epoll event
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9 Standard C library (libc)
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12 #include <sys/epoll.h>
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14 struct epoll_event {
15 uint32_t events; /* Epoll events */
16 epoll_data_t data; /* User data variable */
17 };
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19 union epoll_data {
20 void *ptr;
21 int fd;
22 uint32_t u32;
23 uint64_t u64;
24 };
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26 typedef union epoll_data epoll_data_t;
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29 The epoll_event structure specifies data that the kernel should save
30 and return when the corresponding file descriptor becomes ready.
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33 C library/kernel differences
34 The Linux kernel headers also provide this type, with a slightly dif‐
35 ferent definition:
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37 #include <linux/eventpoll.h>
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39 struct epoll_event {
40 __poll_t events;
41 __u64 data;
42 };
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45 Linux.
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48 epoll_wait(2), epoll_ctl(7)
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52Linux man-pages 6.04 2023-03-30 epoll_event(3type)