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79fa9765ca
We now use AK::Error and AK::ErrorOr<T> in both kernel and userspace! This was a slightly tedious refactoring that took a long time, so it's not unlikely that some bugs crept in. Nevertheless, it does pass basic functionality testing, and it's just real nice to finally see the same pattern in all contexts. :^)
76 lines
1.9 KiB
C++
76 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 <Kernel/Process.h>
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namespace Kernel {
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ErrorOr<FlatPtr> Process::sys$yield()
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{
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VERIFY_NO_PROCESS_BIG_LOCK(this);
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REQUIRE_PROMISE(stdio);
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Thread::current()->yield_without_releasing_big_lock();
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return 0;
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}
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ErrorOr<FlatPtr> Process::sys$sched_setparam(int pid, Userspace<const struct sched_param*> user_param)
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
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REQUIRE_PROMISE(proc);
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struct sched_param desired_param;
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TRY(copy_from_user(&desired_param, user_param));
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if (desired_param.sched_priority < THREAD_PRIORITY_MIN || desired_param.sched_priority > THREAD_PRIORITY_MAX)
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return EINVAL;
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auto* peer = Thread::current();
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SpinlockLocker lock(g_scheduler_lock);
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if (pid != 0)
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peer = Thread::from_tid(pid);
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if (!peer)
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return ESRCH;
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if (!is_superuser() && euid() != peer->process().uid() && uid() != peer->process().uid())
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return EPERM;
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peer->set_priority((u32)desired_param.sched_priority);
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return 0;
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}
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ErrorOr<FlatPtr> Process::sys$sched_getparam(pid_t pid, Userspace<struct sched_param*> user_param)
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
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REQUIRE_PROMISE(proc);
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int priority;
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{
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auto* peer = Thread::current();
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SpinlockLocker lock(g_scheduler_lock);
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if (pid != 0) {
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// FIXME: PID/TID BUG
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// The entire process is supposed to be affected.
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peer = Thread::from_tid(pid);
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}
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if (!peer)
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return ESRCH;
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if (!is_superuser() && euid() != peer->process().uid() && uid() != peer->process().uid())
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return EPERM;
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priority = (int)peer->priority();
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}
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struct sched_param param {
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priority
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};
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TRY(copy_to_user(user_param, ¶m));
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return 0;
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}
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}
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