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/*
* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <Kernel/CoreDump.h>
#include <Kernel/FileSystem/FileDescription.h>
#include <Kernel/FileSystem/VirtualFileSystem.h>
#include <Kernel/PerformanceManager.h>
#include <Kernel/Process.h>
namespace Kernel {
bool g_profiling_all_threads;
PerformanceEventBuffer* g_global_perf_events;
KResultOr<int> Process::sys$profiling_enable(pid_t pid)
{
REQUIRE_NO_PROMISES;
if (pid == -1) {
if (!is_superuser())
return EPERM;
ScopedCritical critical;
if (g_global_perf_events)
g_global_perf_events->clear();
else
g_global_perf_events = PerformanceEventBuffer::try_create_with_size(32 * MiB).leak_ptr();
ScopedSpinLock lock(g_processes_lock);
g_profiling_all_threads = true;
Process::for_each([](auto& process) {
PerformanceManager::add_process_created_event(process);
return IterationDecision::Continue;
});
return 0;
}
ScopedSpinLock lock(g_processes_lock);
auto process = Process::from_pid(pid);
if (!process)
return ESRCH;
if (process->is_dead())
return ESRCH;
if (!is_superuser() && process->uid() != euid())
return EPERM;
if (!process->create_perf_events_buffer_if_needed())
return ENOMEM;
process->set_profiling(true);
return 0;
}
KResultOr<int> Process::sys$profiling_disable(pid_t pid)
{
REQUIRE_NO_PROMISES;
if (pid == -1) {
if (!is_superuser())
return EPERM;
ScopedCritical critical;
g_profiling_all_threads = false;
return 0;
}
ScopedSpinLock lock(g_processes_lock);
auto process = Process::from_pid(pid);
if (!process)
return ESRCH;
if (!is_superuser() && process->uid() != euid())
return EPERM;
if (!process->is_profiling())
return EINVAL;
process->set_profiling(false);
return 0;
}
KResultOr<int> Process::sys$profiling_free_buffer(pid_t pid)
{
REQUIRE_NO_PROMISES;
if (pid == -1) {
if (!is_superuser())
return EPERM;
OwnPtr<PerformanceEventBuffer> perf_events;
{
ScopedCritical critical;
perf_events = g_global_perf_events;
g_global_perf_events = nullptr;
}
return 0;
}
ScopedSpinLock lock(g_processes_lock);
auto process = Process::from_pid(pid);
if (!process)
return ESRCH;
if (!is_superuser() && process->uid() != euid())
return EPERM;
if (process->is_profiling())
return EINVAL;
process->delete_perf_events_buffer();
return 0;
}
}
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