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epoll, eventfd, timerfd, signalfd

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The set libwayland's event loop is made of, in kernel/sys/sys_event.c:
four kinds of descriptor with no inode, FD_EVENT, that read() drains
and poll() reports on. They were table entries returning ENOSYS that
read as done.

epoll registers (descriptor, file) pairs, so a closed descriptor
leaves the set; level- and edge-triggered, EPOLLONESHOT. Waiting is
poll()'s, a tick at a time. The old eventfd and signalfd numbers (284,
282) were aliased to the new calls and read flags from a garbage
register; they are their own entries now, with epoll_create and
epoll_pwait.

cmd/evtest checks each, then all four in one set. The plans are
brought up to date: everything Wayland was waiting on is built except
setsockopt.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01S1giNvrHTrPMPw7V6x1kQ4
This commit is contained in:
Nexoniarz 2026-10-24 10:59:52 +02:00
commit a4fbdb7437
12 changed files with 974 additions and 37 deletions
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14
kernel/sys/table.inc
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@ -280,14 +280,21 @@ SYSCALL(175, 270, pselect6)
SYSCALL(176, 271, ppoll)
// --- epoll / eventfd / signalfd / timerfd ---
// signalfd4 and eventfd2 are 289 and 290. 282 and 284 are the originals,
// which have no flags argument -- they were once aliased to the new ones,
// which then read their flags from whatever the caller left in a register.
SYSCALL(177, 291, epoll_create1)
SYSCALL(178, 233, epoll_ctl)
SYSCALL(179, 232, epoll_wait)
SYSCALL(180, 282, signalfd4)
SYSCALL(181, 284, eventfd2)
SYSCALL(180, 289, signalfd4)
SYSCALL(181, 290, eventfd2)
SYSCALL(182, 283, timerfd_create)
SYSCALL(183, 286, timerfd_settime)
SYSCALL(184, 287, timerfd_gettime)
SYSCALL(202, 213, epoll_create)
SYSCALL(203, 281, epoll_pwait)
SYSCALL(204, 282, signalfd)
SYSCALL(205, 284, eventfd)
// --- mounts ---
SYSCALL(185, 165, mount)
@ -297,8 +304,5 @@ SYSCALL(186, 166, umount2)
// --- additional Linux numbers routed to an existing handler ---
SYSCALL_ALIAS( 58, fork)
SYSCALL_ALIAS( 280, utimensat)
SYSCALL_ALIAS( 281, epoll_wait)
SYSCALL_ALIAS( 289, signalfd4)
SYSCALL_ALIAS( 290, eventfd2)
SYSCALL_ALIAS( 295, readv)
SYSCALL_ALIAS( 296, writev)