timerfd: Suppress kqueue readability after jump read

Do not report EVFILT_READ after reading a discontinuous clock jump.
This makes the kqueue filter consistent with Linux epoll behavior
and timerfd_poll(), which already checks tfd_jumped != TFD_READ before
reporting POLLIN.

MFC after: 2 weeks

This commit is contained in:

Jake Freeland

2026-03-20 01:34:15 -05:00

parent b11fba4126

commit 33345b8834

1 changed files with 1 additions and 1 deletions

									
										sys/kern/sys_timerfd.c
									
		+1
		-1
	
												View File
												
				@@ -290,7 +290,7 @@ filt_timerfdread(struct knote *kn, long hint)

					mtx_assert(&tfd->tfd_lock, MA_OWNED);

					kn->kn_data = (int64_t)tfd->tfd_count;

					return (tfd->tfd_count > 0);

					return (tfd->tfd_count > 0 && tfd->tfd_jumped != TFD_READ);

				}

				static const struct filterops timerfd_rfiltops = {