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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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4
docs/architecture/syscalls.md
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@ -82,11 +82,11 @@ Roughly 190 native numbers covering:
| Identity | the full real/effective/saved set for both uid and gid, groups, umask |
| Memory | mmap, munmap, mprotect, brk/sbrk, madvise, System V shared memory |
| Filesystem | the ordinary set, the whole `*at()` family, statfs, xattr, mount/umount2 |
| I/O | read/write, readv/writev, pread/pwrite, sendfile, poll/select/ppoll/pselect6, epoll, ioctl, fcntl |
| I/O | read/write, readv/writev, pread/pwrite, sendfile, poll/select/ppoll/pselect6, epoll (create, create1, ctl, wait, pwait), ioctl, fcntl |
| Sockets | socket, bind, listen, accept, connect, sendto, recvfrom, socketpair, setsockopt, getsockopt |
| Signals | rt_sigaction, rt_sigreturn, rt_sigsuspend, rt_sigpending, rt_sigtimedwait, sigaltstack |
| Time | gettimeofday, clock_gettime, clock_getres, nanosleep, clock_nanosleep, alarm, timers |
| Notification | eventfd2, timerfd_create/settime/gettime, signalfd4 |
| Notification | eventfd, eventfd2, timerfd_create/settime/gettime, signalfd, signalfd4 -- see `kernel/sys/sys_event.c` |
### Argument fetching