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ac71775de5
This makes it a lot easier to return errors since we no longer have to worry about negating EFOO errors and can just return them flat.
108 lines
3.4 KiB
C++
108 lines
3.4 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<int> Process::sys$yield()
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{
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REQUIRE_PROMISE(stdio);
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Thread::current()->yield_without_holding_big_lock();
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return 0;
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}
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KResultOr<int> Process::sys$donate(pid_t tid)
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{
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REQUIRE_PROMISE(stdio);
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if (tid < 0)
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return EINVAL;
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ScopedCritical critical;
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auto thread = Thread::from_tid(tid);
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if (!thread || thread->pid() != pid())
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return ESRCH;
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Thread::current()->donate_without_holding_big_lock(thread, "sys$donate");
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return 0;
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}
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KResultOr<int> Process::sys$sched_setparam(int pid, Userspace<const struct sched_param*> user_param)
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{
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REQUIRE_PROMISE(proc);
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struct sched_param desired_param;
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if (!copy_from_user(&desired_param, user_param))
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return EFAULT;
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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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ScopedSpinLock 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() && m_euid != peer->process().m_uid && m_uid != peer->process().m_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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KResultOr<int> Process::sys$sched_getparam(pid_t pid, Userspace<struct sched_param*> user_param)
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{
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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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ScopedSpinLock 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() && m_euid != peer->process().m_uid && m_uid != peer->process().m_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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if (!copy_to_user(user_param, ¶m))
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return EFAULT;
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return 0;
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}
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}
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