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Kernel: Report POLLNVAL events in sys$poll instead of returning EBADF

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As required by Dr. Posix.
This commit is contained in:
Idan Horowitz 2022-07-10 00:18:54 +03:00 • committed by Andreas Kling
parent e32f6903f6
commit 275e5cdb64
3 changed files with 22 additions and 5 deletions
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9
Kernel/Syscalls/poll.cpp
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@ -50,7 +50,10 @@ ErrorOr<FlatPtr> Process::sys$poll(Userspace<Syscall::SC_poll_params const*> use
TRY(m_fds.with_shared([&](auto& fds) -> ErrorOr<void> {
for (size_t i = 0; i < params.nfds; i++) {
auto& pfd = fds_copy[i];
auto description = TRY(fds.open_file_description(pfd.fd));
RefPtr<OpenFileDescription> description;
auto description_or_error = fds.open_file_description(pfd.fd);
if (!description_or_error.is_error())
description = description_or_error.release_value();
BlockFlags block_flags = BlockFlags::WriteError | BlockFlags::WriteHangUp; // always want POLLERR, POLLHUP, POLLNVAL
if (pfd.events & POLLIN)
block_flags |= BlockFlags::Read;
@ -93,11 +96,13 @@ ErrorOr<FlatPtr> Process::sys$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)) {
if (has_any_flag(fds_entry.unblocked_flags, BlockFlags::WriteError | BlockFlags::WriteHangUp) || !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 {
if (has_flag(fds_entry.unblocked_flags, BlockFlags::Read)) {
VERIFY(pfd.events & POLLIN);