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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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12
kernel/sys/sys_compat.c
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@ -226,14 +226,4 @@ addr_t sys_getrandom(void)
// pselect6 / ppoll live in sys_poll.c alongside select/poll.
// epoll: not implemented.
addr_t sys_epoll_create1(void) { return -ENOSYS; }
addr_t sys_epoll_ctl(void) { return -ENOSYS; }
addr_t sys_epoll_wait(void) { return -ENOSYS; }
// signalfd / eventfd / timerfd: not implemented.
addr_t sys_signalfd4(void) { return -ENOSYS; }
addr_t sys_eventfd2(void) { return -ENOSYS; }
addr_t sys_timerfd_create(void) { return -ENOSYS; }
addr_t sys_timerfd_settime(void){ return -ENOSYS; }
addr_t sys_timerfd_gettime(void){ return -ENOSYS; }
// epoll, eventfd, timerfd and signalfd live in sys_event.c.