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https://github.com/RGBCube/serenity
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bad6d50b86
This change lays the foundation for making the require_promise return an error hand handling the process abort outside of the syscall implementations, to avoid cases where we would leak resources. It also has the advantage that it makes removes a gs pointer read to look up the current thread, then process for every syscall. We can instead go through the Process this pointer in most cases.
62 lines
1.9 KiB
C++
62 lines
1.9 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Variant.h>
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#include <Kernel/Debug.h>
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#include <Kernel/Process.h>
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namespace Kernel {
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ErrorOr<siginfo_t> Process::do_waitid(Variant<Empty, NonnullRefPtr<Process>, NonnullRefPtr<ProcessGroup>> waitee, int options)
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{
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ErrorOr<siginfo_t> result = siginfo_t {};
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if (Thread::current()->block<Thread::WaitBlocker>({}, options, move(waitee), result).was_interrupted())
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return EINTR;
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VERIFY(!result.is_error() || (options & WNOHANG));
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return result;
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}
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ErrorOr<FlatPtr> Process::sys$waitid(Userspace<const Syscall::SC_waitid_params*> user_params)
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
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require_promise(Pledge::proc);
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auto params = TRY(copy_typed_from_user(user_params));
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Variant<Empty, NonnullRefPtr<Process>, NonnullRefPtr<ProcessGroup>> waitee;
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switch (params.idtype) {
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case P_ALL:
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break;
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case P_PID: {
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auto waitee_process = Process::from_pid(params.id);
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if (!waitee_process)
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return ECHILD;
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bool waitee_is_child = waitee_process->ppid() == Process::current().pid();
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bool waitee_is_our_tracee = waitee_process->has_tracee_thread(Process::current().pid());
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if (!waitee_is_child && !waitee_is_our_tracee)
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return ECHILD;
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waitee = waitee_process.release_nonnull();
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break;
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}
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case P_PGID: {
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auto waitee_group = ProcessGroup::from_pgid(params.id);
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if (!waitee_group) {
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return ECHILD;
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}
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waitee = waitee_group.release_nonnull();
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break;
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}
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default:
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return EINVAL;
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}
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dbgln_if(PROCESS_DEBUG, "sys$waitid({}, {}, {}, {})", params.idtype, params.id, params.infop, params.options);
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auto siginfo = TRY(do_waitid(move(waitee), params.options));
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TRY(copy_to_user(params.infop, &siginfo));
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return 0;
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}
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}
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