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Kernel: Stop reporting POLLHUP exclusively when available in sys$poll

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As per Dr. Posix, unlike POLLERR and POLLNVAL, POLLHUP is only mutually
exclusive with POLLOUT, all other events may be reported together with
it.
This commit is contained in:
Idan Horowitz 2022-07-10 00:29:59 +03:00 committed by Andreas Kling
parent 08e88bfcad
commit 68980bf711
Notes: sideshowbarker 2024-07-17 09:32:48 +09:00 
Author: https://github.com/IdanHo
Commit: https://github.com/SerenityOS/serenity/commit/68980bf711
Pull-request: https://github.com/SerenityOS/serenity/pull/14533
Reviewed-by: https://github.com/linusg ✅
1 changed files with 4 additions and 4 deletions
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8
Kernel/Syscalls/poll.cpp
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@ -96,11 +96,11 @@ ErrorOr<FlatPtr> Process::sys$poll(Userspace<Syscall::SC_poll_params const*> use
if (fds_entry.unblocked_flags == BlockFlags::None)
continue;
if (has_any_flag(fds_entry.unblocked_flags, BlockFlags::WriteError | BlockFlags::WriteHangUp) || !fds_entry.description) {
if (has_flag(fds_entry.unblocked_flags, BlockFlags::WriteHangUp))
pfd.revents |= POLLHUP;
if (has_flag(fds_entry.unblocked_flags, BlockFlags::WriteError) || !fds_entry.description) {
if (has_flag(fds_entry.unblocked_flags, BlockFlags::WriteError))
pfd.revents |= POLLERR;
if (has_flag(fds_entry.unblocked_flags, BlockFlags::WriteHangUp))
pfd.revents |= POLLHUP;
if (!fds_entry.description)
pfd.revents |= POLLNVAL;
} else {
@ -112,7 +112,7 @@ ErrorOr<FlatPtr> Process::sys$poll(Userspace<Syscall::SC_poll_params const*> use
VERIFY(pfd.events & POLLPRI);
pfd.revents |= POLLPRI;
}
if (has_flag(fds_entry.unblocked_flags, BlockFlags::Write)) {
if (!has_flag(fds_entry.unblocked_flags, BlockFlags::WriteHangUp) && has_flag(fds_entry.unblocked_flags, BlockFlags::Write)) {
VERIFY(pfd.events & POLLOUT);
pfd.revents |= POLLOUT;
}