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Kernel: Stop providing POLLRDHUP events in sys$poll by default

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Dr. Posix specifies that only POLLERR, POLLHUP & POLLNVAL are provided
by default.
This commit is contained in:
Idan Horowitz 2022-07-10 00:05:13 +03:00 committed by Andreas Kling
parent 5ca46abb51
commit e32f6903f6
Notes: sideshowbarker 2024-07-17 09:32:59 +09:00 
Author: https://github.com/IdanHo
Commit: https://github.com/SerenityOS/serenity/commit/e32f6903f6
Pull-request: https://github.com/SerenityOS/serenity/pull/14533
Reviewed-by: https://github.com/linusg ✅
1 changed files with 8 additions and 4 deletions
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12
Kernel/Syscalls/poll.cpp
View file

@ -51,7 +51,7 @@ ErrorOr<FlatPtr> Process::sys$poll(Userspace<Syscall::SC_poll_params const*> use
for (size_t i = 0; i < params.nfds; i++) {
auto& pfd = fds_copy[i];
auto description = TRY(fds.open_file_description(pfd.fd));
BlockFlags block_flags = BlockFlags::Exception; // always want POLLERR, POLLHUP, POLLNVAL
BlockFlags block_flags = BlockFlags::WriteError | BlockFlags::WriteHangUp; // always want POLLERR, POLLHUP, POLLNVAL
if (pfd.events & POLLIN)
block_flags |= BlockFlags::Read;
if (pfd.events & POLLOUT)
@ -60,6 +60,8 @@ ErrorOr<FlatPtr> Process::sys$poll(Userspace<Syscall::SC_poll_params const*> use
block_flags |= BlockFlags::ReadPriority;
if (pfd.events & POLLWRBAND)
block_flags |= BlockFlags::WritePriority;
if (pfd.events & POLLRDHUP)
block_flags |= BlockFlags::ReadHangUp;
fds_info.unchecked_append({ move(description), block_flags });
}
return {};
@ -91,9 +93,7 @@ ErrorOr<FlatPtr> Process::sys$poll(Userspace<Syscall::SC_poll_params const*> use
if (fds_entry.unblocked_flags == BlockFlags::None)
continue;
if (has_any_flag(fds_entry.unblocked_flags, BlockFlags::Exception)) {
if (has_flag(fds_entry.unblocked_flags, BlockFlags::ReadHangUp))
pfd.revents |= POLLRDHUP;
if (has_any_flag(fds_entry.unblocked_flags, BlockFlags::WriteError | BlockFlags::WriteHangUp)) {
if (has_flag(fds_entry.unblocked_flags, BlockFlags::WriteError))
pfd.revents |= POLLERR;
if (has_flag(fds_entry.unblocked_flags, BlockFlags::WriteHangUp))
@ -115,6 +115,10 @@ ErrorOr<FlatPtr> Process::sys$poll(Userspace<Syscall::SC_poll_params const*> use
VERIFY(pfd.events & POLLWRBAND);
pfd.revents |= POLLWRBAND;
}
if (has_flag(fds_entry.unblocked_flags, BlockFlags::ReadHangUp)) {
VERIFY(pfd.events & POLLRDHUP);
pfd.revents |= POLLRDHUP;
}
}
if (pfd.revents)
fds_with_revents++;