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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
Notes: sideshowbarker 2024-07-17 09:32:55 +09:00 
Author: https://github.com/IdanHo
Commit: https://github.com/SerenityOS/serenity/commit/275e5cdb64
Pull-request: https://github.com/SerenityOS/serenity/pull/14533
Reviewed-by: https://github.com/linusg ✅
3 changed files with 22 additions and 5 deletions
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9
Kernel/Syscalls/poll.cpp
View File

@ -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);

2
Kernel/Thread.h
View File

@ -668,7 +668,7 @@ public:
class SelectBlocker final : public FileBlocker {
public:
struct FDInfo {
NonnullRefPtr<OpenFileDescription> description;
RefPtr<OpenFileDescription> description;
BlockFlags block_flags { BlockFlags::None };
BlockFlags unblocked_flags { BlockFlags::None };
};

16
Kernel/ThreadBlockers.cpp
View File

@ -360,6 +360,10 @@ bool Thread::SelectBlocker::setup_blocker()
if (!should_block)
continue;
if (!fd_entry.description) {
should_block = false;
continue;
}
if (!fd_entry.description->blocker_set().add_blocker(*this, &fd_entry))
should_block = false;
}
@ -371,8 +375,10 @@ Thread::SelectBlocker::~SelectBlocker() = default;
void Thread::SelectBlocker::finalize()
{
Thread::FileBlocker::finalize();
for (auto& fd_entry : m_fds)
fd_entry.description->blocker_set().remove_blocker(*this);
for (auto& fd_entry : m_fds) {
if (fd_entry.description)
fd_entry.description->blocker_set().remove_blocker(*this);
}
}
void Thread::SelectBlocker::will_unblock_immediately_without_blocking(UnblockImmediatelyReason reason)
@ -397,6 +403,7 @@ bool Thread::SelectBlocker::unblock_if_conditions_are_met(bool from_add_blocker,
if (m_did_unblock)
return false;
VERIFY(fd_info.description);
auto unblock_flags = fd_info.description->should_unblock(fd_info.block_flags);
if (unblock_flags == BlockFlags::None)
return false;
@ -421,6 +428,11 @@ size_t Thread::SelectBlocker::collect_unblocked_flags()
for (auto& fd_entry : m_fds) {
VERIFY(fd_entry.block_flags != FileBlocker::BlockFlags::None);
if (!fd_entry.description) {
count++;
continue;
}
// unblock will have set at least the first descriptor's unblock
// flags that triggered the unblock. Make sure we don't discard that
// information as it may have changed by now!