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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <Kernel/Process.h>
namespace Kernel {
KResultOr<int> Process::sys$yield()
{
REQUIRE_PROMISE(stdio);
Thread::current()->yield_without_holding_big_lock();
return 0;
}
KResultOr<int> Process::sys$donate(pid_t tid)
{
REQUIRE_PROMISE(stdio);
if (tid < 0)
return EINVAL;
ScopedCritical critical;
auto thread = Thread::from_tid(tid);
if (!thread || thread->pid() != pid())
return ESRCH;
Thread::current()->donate_without_holding_big_lock(thread, "sys$donate");
return 0;
}
KResultOr<int> Process::sys$sched_setparam(int pid, Userspace<const struct sched_param*> user_param)
{
REQUIRE_PROMISE(proc);
struct sched_param desired_param;
if (!copy_from_user(&desired_param, user_param))
return EFAULT;
if (desired_param.sched_priority < THREAD_PRIORITY_MIN || desired_param.sched_priority > THREAD_PRIORITY_MAX)
return EINVAL;
auto* peer = Thread::current();
ScopedSpinLock lock(g_scheduler_lock);
if (pid != 0)
peer = Thread::from_tid(pid);
if (!peer)
return ESRCH;
if (!is_superuser() && euid() != peer->process().uid() && uid() != peer->process().uid())
return EPERM;
peer->set_priority((u32)desired_param.sched_priority);
return 0;
}
KResultOr<int> Process::sys$sched_getparam(pid_t pid, Userspace<struct sched_param*> user_param)
{
REQUIRE_PROMISE(proc);
int priority;
{
auto* peer = Thread::current();
ScopedSpinLock lock(g_scheduler_lock);
if (pid != 0) {
// FIXME: PID/TID BUG
// The entire process is supposed to be affected.
peer = Thread::from_tid(pid);
}
if (!peer)
return ESRCH;
if (!is_superuser() && euid() != peer->process().uid() && uid() != peer->process().uid())
return EPERM;
priority = (int)peer->priority();
}
struct sched_param param {
priority
};
if (!copy_to_user(user_param, ¶m))
return EFAULT;
return 0;
}
}
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