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Date: Wed, 29 May 2024 06:49:59 +0000
From: Joe Damato <>
Cc: Joe Damato <>
Subject: [PATCH] sys/epoll.h: add epoll ioctls

add two ioctls to get and set struct epoll_params to allow users to
control epoll based busy polling of network sockets.

added to uapi in commit 18e2bf0edf4dd88d9656ec92395aa47392e85b61 (Linux
kernel 6.9 and newer).
 include/sys/epoll.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/include/sys/epoll.h b/include/sys/epoll.h
index ac81a841..5f975c4a 100644
--- a/include/sys/epoll.h
+++ b/include/sys/epoll.h
@@ -7,6 +7,7 @@ extern "C" {
 #include <stdint.h>
 #include <sys/types.h>
+#include <sys/ioctl.h>
 #include <fcntl.h>
 #define __NEED_sigset_t
@@ -54,6 +55,17 @@ __attribute__ ((__packed__))
+struct epoll_params {
+	uint32_t busy_poll_usecs;
+	uint16_t busy_poll_budget;
+	uint8_t prefer_busy_poll;
+	uint8_t __pad;
+#define EPOLL_IOC_TYPE 0x8A
+#define EPIOCSPARAMS _IOW(EPOLL_IOC_TYPE, 0x01, struct epoll_params)
+#define EPIOCGPARAMS _IOR(EPOLL_IOC_TYPE, 0x02, struct epoll_params)
 int epoll_create(int);
 int epoll_create1(int);

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