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5d180d1f99
(...and ASSERT_NOT_REACHED => VERIFY_NOT_REACHED) Since all of these checks are done in release builds as well, let's rename them to VERIFY to prevent confusion, as everyone is used to assertions being compiled out in release. We can introduce a new ASSERT macro that is specifically for debug checks, but I'm doing this wholesale conversion first since we've accumulated thousands of these already, and it's not immediately obvious which ones are suitable for ASSERT.
252 lines
9.4 KiB
C++
252 lines
9.4 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/ScopeGuard.h>
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#include <AK/Time.h>
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#include <Kernel/Debug.h>
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#include <Kernel/FileSystem/FileDescription.h>
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#include <Kernel/Process.h>
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namespace Kernel {
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int Process::sys$select(const Syscall::SC_select_params* user_params)
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{
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REQUIRE_PROMISE(stdio);
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Syscall::SC_select_params params;
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if (!copy_from_user(¶ms, user_params))
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return -EFAULT;
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if (params.nfds < 0)
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return -EINVAL;
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Thread::BlockTimeout timeout;
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if (params.timeout) {
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timespec timeout_copy;
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if (!copy_from_user(&timeout_copy, params.timeout))
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return -EFAULT;
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timeout = Thread::BlockTimeout(false, &timeout_copy);
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}
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auto current_thread = Thread::current();
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u32 previous_signal_mask = 0;
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if (params.sigmask) {
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sigset_t sigmask_copy;
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if (!copy_from_user(&sigmask_copy, params.sigmask))
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return -EFAULT;
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previous_signal_mask = current_thread->update_signal_mask(sigmask_copy);
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}
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ScopeGuard rollback_signal_mask([&]() {
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if (params.sigmask)
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current_thread->update_signal_mask(previous_signal_mask);
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});
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fd_set fds_read, fds_write, fds_except;
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if (params.readfds && !copy_from_user(&fds_read, params.readfds))
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return -EFAULT;
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if (params.writefds && !copy_from_user(&fds_write, params.writefds))
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return -EFAULT;
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if (params.exceptfds && !copy_from_user(&fds_except, params.exceptfds))
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return -EFAULT;
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Thread::SelectBlocker::FDVector fds_info;
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Vector<int> fds;
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for (int fd = 0; fd < params.nfds; fd++) {
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u32 block_flags = (u32)Thread::FileBlocker::BlockFlags::None;
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if (params.readfds && FD_ISSET(fd, &fds_read))
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block_flags |= (u32)Thread::FileBlocker::BlockFlags::Read;
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if (params.writefds && FD_ISSET(fd, &fds_write))
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block_flags |= (u32)Thread::FileBlocker::BlockFlags::Write;
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if (params.exceptfds && FD_ISSET(fd, &fds_except))
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block_flags |= (u32)Thread::FileBlocker::BlockFlags::Exception;
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if (block_flags == (u32)Thread::FileBlocker::BlockFlags::None)
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continue;
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auto description = file_description(fd);
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if (!description) {
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dbgln("sys$select: Bad fd number {}", fd);
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return -EBADF;
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}
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fds_info.append({ description.release_nonnull(), (Thread::FileBlocker::BlockFlags)block_flags });
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fds.append(fd);
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}
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if constexpr (IO_DEBUG || POLL_SELECT_DEBUG)
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dbgln("selecting on {} fds, timeout={}", fds_info.size(), params.timeout);
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if (current_thread->block<Thread::SelectBlocker>(timeout, fds_info).was_interrupted()) {
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dbgln_if(POLL_SELECT_DEBUG, "select was interrupted");
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return -EINTR;
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}
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if (params.readfds)
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FD_ZERO(&fds_read);
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if (params.writefds)
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FD_ZERO(&fds_write);
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if (params.exceptfds)
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FD_ZERO(&fds_except);
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int marked_fd_count = 0;
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for (size_t i = 0; i < fds_info.size(); i++) {
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auto& fd_entry = fds_info[i];
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if (fd_entry.unblocked_flags == Thread::FileBlocker::BlockFlags::None)
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continue;
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if (params.readfds && ((u32)fd_entry.unblocked_flags & (u32)Thread::FileBlocker::BlockFlags::Read)) {
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FD_SET(fds[i], &fds_read);
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marked_fd_count++;
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}
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if (params.writefds && ((u32)fd_entry.unblocked_flags & (u32)Thread::FileBlocker::BlockFlags::Write)) {
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FD_SET(fds[i], &fds_write);
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marked_fd_count++;
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}
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if (params.exceptfds && ((u32)fd_entry.unblocked_flags & (u32)Thread::FileBlocker::BlockFlags::Exception)) {
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FD_SET(fds[i], &fds_except);
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marked_fd_count++;
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}
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}
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if (params.readfds && !copy_to_user(params.readfds, &fds_read))
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return -EFAULT;
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if (params.writefds && !copy_to_user(params.writefds, &fds_write))
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return -EFAULT;
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if (params.exceptfds && !copy_to_user(params.exceptfds, &fds_except))
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return -EFAULT;
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return marked_fd_count;
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}
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int Process::sys$poll(Userspace<const Syscall::SC_poll_params*> user_params)
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{
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REQUIRE_PROMISE(stdio);
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// FIXME: Return -EINVAL if timeout is invalid.
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Syscall::SC_poll_params params;
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if (!copy_from_user(¶ms, user_params))
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return -EFAULT;
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if (params.nfds >= m_max_open_file_descriptors)
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return -ENOBUFS;
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Thread::BlockTimeout timeout;
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if (params.timeout) {
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timespec timeout_copy;
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if (!copy_from_user(&timeout_copy, params.timeout))
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return -EFAULT;
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timeout = Thread::BlockTimeout(false, &timeout_copy);
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}
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sigset_t sigmask = {};
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if (params.sigmask && !copy_from_user(&sigmask, params.sigmask))
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return -EFAULT;
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Vector<pollfd> fds_copy;
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if (params.nfds > 0) {
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Checked nfds_checked = sizeof(pollfd);
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nfds_checked *= params.nfds;
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if (nfds_checked.has_overflow())
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return -EFAULT;
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fds_copy.resize(params.nfds);
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if (!copy_from_user(fds_copy.data(), ¶ms.fds[0], nfds_checked.value()))
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return -EFAULT;
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}
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Thread::SelectBlocker::FDVector fds_info;
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for (size_t i = 0; i < params.nfds; i++) {
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auto& pfd = fds_copy[i];
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auto description = file_description(pfd.fd);
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if (!description) {
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dbgln("sys$poll: Bad fd number {}", pfd.fd);
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return -EBADF;
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}
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u32 block_flags = (u32)Thread::FileBlocker::BlockFlags::Exception; // always want POLLERR, POLLHUP, POLLNVAL
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if (pfd.events & POLLIN)
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block_flags |= (u32)Thread::FileBlocker::BlockFlags::Read;
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if (pfd.events & POLLOUT)
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block_flags |= (u32)Thread::FileBlocker::BlockFlags::Write;
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if (pfd.events & POLLPRI)
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block_flags |= (u32)Thread::FileBlocker::BlockFlags::ReadPriority;
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fds_info.append({ description.release_nonnull(), (Thread::FileBlocker::BlockFlags)block_flags });
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}
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auto current_thread = Thread::current();
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u32 previous_signal_mask = 0;
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if (params.sigmask)
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previous_signal_mask = current_thread->update_signal_mask(sigmask);
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ScopeGuard rollback_signal_mask([&]() {
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if (params.sigmask)
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current_thread->update_signal_mask(previous_signal_mask);
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});
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if constexpr (IO_DEBUG || POLL_SELECT_DEBUG)
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dbgln("polling on {} fds, timeout={}", fds_info.size(), params.timeout);
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if (current_thread->block<Thread::SelectBlocker>(timeout, fds_info).was_interrupted())
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return -EINTR;
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int fds_with_revents = 0;
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for (unsigned i = 0; i < params.nfds; ++i) {
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auto& pfd = fds_copy[i];
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auto& fds_entry = fds_info[i];
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pfd.revents = 0;
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if (fds_entry.unblocked_flags == Thread::FileBlocker::BlockFlags::None)
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continue;
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if ((u32)fds_entry.unblocked_flags & (u32)Thread::FileBlocker::BlockFlags::Exception) {
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if ((u32)fds_entry.unblocked_flags & (u32)Thread::FileBlocker::BlockFlags::ReadHangUp)
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pfd.revents |= POLLRDHUP;
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if ((u32)fds_entry.unblocked_flags & (u32)Thread::FileBlocker::BlockFlags::WriteError)
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pfd.revents |= POLLERR;
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if ((u32)fds_entry.unblocked_flags & (u32)Thread::FileBlocker::BlockFlags::WriteHangUp)
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pfd.revents |= POLLNVAL;
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} else {
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if ((u32)fds_entry.unblocked_flags & (u32)Thread::FileBlocker::BlockFlags::Read) {
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VERIFY(pfd.events & POLLIN);
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pfd.revents |= POLLIN;
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}
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if ((u32)fds_entry.unblocked_flags & (u32)Thread::FileBlocker::BlockFlags::ReadPriority) {
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VERIFY(pfd.events & POLLPRI);
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pfd.revents |= POLLPRI;
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}
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if ((u32)fds_entry.unblocked_flags & (u32)Thread::FileBlocker::BlockFlags::Write) {
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VERIFY(pfd.events & POLLOUT);
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pfd.revents |= POLLOUT;
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}
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}
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if (pfd.revents)
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fds_with_revents++;
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}
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if (params.nfds > 0 && !copy_to_user(¶ms.fds[0], fds_copy.data(), params.nfds * sizeof(pollfd)))
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return -EFAULT;
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return fds_with_revents;
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}
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}
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