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https://github.com/LadybirdBrowser/ladybird.git
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f4a5c9b6c2
Allow passing in an optional timeout to Thread::block and move the timeout check out of Thread::Blocker. This way all Blockers implicitly support timeouts and don't need to implement it themselves. Do however allow them to override timeouts (e.g. for sockets).
125 lines
4.4 KiB
C++
125 lines
4.4 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 <Kernel/Process.h>
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namespace Kernel {
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KResultOr<siginfo_t> Process::do_waitid(idtype_t idtype, int id, int options)
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{
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if (idtype == P_PID) {
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ScopedSpinLock lock(g_processes_lock);
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if (idtype == P_PID && !Process::from_pid(id))
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return KResult(-ECHILD);
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}
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pid_t waitee_pid;
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// FIXME: WaitBlocker should support idtype/id specs directly.
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if (idtype == P_ALL) {
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waitee_pid = -1;
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} else if (idtype == P_PID) {
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waitee_pid = id;
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} else {
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// FIXME: Implement other PID specs.
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return KResult(-EINVAL);
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}
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if (Thread::current()->block<Thread::WaitBlocker>(nullptr, options, waitee_pid).was_interrupted())
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return KResult(-EINTR);
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ScopedSpinLock lock(g_processes_lock);
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// NOTE: If waitee was -1, m_waitee_pid will have been filled in by the scheduler.
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auto waitee_process = Process::from_pid(waitee_pid);
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if (!waitee_process)
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return KResult(-ECHILD);
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ASSERT(waitee_process);
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if (waitee_process->is_dead()) {
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return reap(*waitee_process);
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} else {
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auto* waitee_thread = Thread::from_tid(waitee_pid);
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if (!waitee_thread)
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return KResult(-ECHILD);
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ASSERT((options & WNOHANG) || waitee_thread->state() == Thread::State::Stopped);
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siginfo_t siginfo;
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memset(&siginfo, 0, sizeof(siginfo));
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siginfo.si_signo = SIGCHLD;
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siginfo.si_pid = waitee_process->pid();
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siginfo.si_uid = waitee_process->uid();
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switch (waitee_thread->state()) {
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case Thread::State::Stopped:
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siginfo.si_code = CLD_STOPPED;
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break;
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case Thread::State::Running:
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case Thread::State::Runnable:
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case Thread::State::Blocked:
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case Thread::State::Dying:
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case Thread::State::Queued:
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siginfo.si_code = CLD_CONTINUED;
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break;
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default:
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ASSERT_NOT_REACHED();
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break;
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}
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siginfo.si_status = waitee_thread->m_stop_signal;
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return siginfo;
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}
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}
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pid_t Process::sys$waitid(const Syscall::SC_waitid_params* user_params)
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{
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REQUIRE_PROMISE(proc);
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Syscall::SC_waitid_params params;
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if (!validate_read_and_copy_typed(¶ms, user_params))
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return -EFAULT;
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if (!validate_write_typed(params.infop))
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return -EFAULT;
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#ifdef PROCESS_DEBUG
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dbg() << "sys$waitid(" << params.idtype << ", " << params.id << ", " << params.infop << ", " << params.options << ")";
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#endif
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auto siginfo_or_error = do_waitid(static_cast<idtype_t>(params.idtype), params.id, params.options);
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if (siginfo_or_error.is_error())
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return siginfo_or_error.error();
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// While we waited, the process lock was dropped. This gave other threads
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// the opportunity to mess with the memory. For example, it could free the
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// region, and map it to a region to which it has no write permissions.
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// Therefore, we need to re-validate the pointer.
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if (!validate_write_typed(params.infop))
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return -EFAULT;
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copy_to_user(params.infop, &siginfo_or_error.value());
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return 0;
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}
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}
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