llvm/libc/test/src/sched/param_and_scheduler_test.cpp

//===-- Unittests for sched_{set,get}{scheduler,param} --------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#include "src/errno/libc_errno.h"
#include "src/sched/sched_get_priority_max.h"
#include "src/sched/sched_get_priority_min.h"
#include "src/sched/sched_getparam.h"
#include "src/sched/sched_getscheduler.h"
#include "src/sched/sched_setparam.h"
#include "src/sched/sched_setscheduler.h"
#include "src/unistd/getuid.h"
#include "test/UnitTest/Test.h"

#include <sched.h>

// We Test:
// SCHED_OTHER, SCHED_FIFO, SCHED_RR
//
// TODO: Missing two tests.
//       1) Missing permissions -> EPERM. Maybe doable by finding
//          another pid that exists and changing its policy, but that
//          seems risky. Maybe something with fork/clone would work.
//
//       2) Unkown pid -> ESRCH. Probably safe to choose a large range
//          number or scanning current pids and getting one that doesn't
//          exist, but again seems like it may risk actually changing
//          sched policy on a running task.
//
//       Linux specific test could also include:
//          SCHED_ISO, SCHED_DEADLINE

class SchedTest : public LIBC_NAMESPACE::testing::Test { … };

#define LIST_SCHED_TESTS(policy, can_set) …

// Mandated by POSIX.
LIST_SCHED_TESTS(…)
LIST_SCHED_TESTS(…)
LIST_SCHED_TESTS(…)

// Linux extensions.
LIST_SCHED_TESTS(…)
LIST_SCHED_TESTS(…)

TEST(LlvmLibcSchedParamAndSchedulerTest, NullParamTest) { … }