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//===-- 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/__support/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/ErrnoCheckingTest.h"
#include "test/UnitTest/Test.h"
#include "hdr/sched_macros.h"
#include "hdr/types/struct_sched_param.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::ErrnoCheckingTest {
public:
void testSched(int policy, bool is_mandatory) {
int init_policy = LIBC_NAMESPACE::sched_getscheduler(0);
ASSERT_GE(init_policy, 0);
ASSERT_ERRNO_SUCCESS();
int max_priority = LIBC_NAMESPACE::sched_get_priority_max(policy);
ASSERT_GE(max_priority, 0);
ASSERT_ERRNO_SUCCESS();
int min_priority = LIBC_NAMESPACE::sched_get_priority_min(policy);
ASSERT_GE(min_priority, 0);
ASSERT_ERRNO_SUCCESS();
struct sched_param param = {min_priority};
// Negative pid
ASSERT_EQ(LIBC_NAMESPACE::sched_setscheduler(-1, policy, ¶m), -1);
ASSERT_ERRNO_EQ(EINVAL);
ASSERT_EQ(LIBC_NAMESPACE::sched_getscheduler(-1), -1);
ASSERT_ERRNO_EQ(EINVAL);
// Invalid Policy
ASSERT_EQ(LIBC_NAMESPACE::sched_setscheduler(0, policy | 128, ¶m), -1);
ASSERT_ERRNO_EQ(EINVAL);
// Out of bounds priority
param.sched_priority = min_priority - 1;
ASSERT_EQ(LIBC_NAMESPACE::sched_setscheduler(0, policy, ¶m), -1);
ASSERT_ERRNO_EQ(EINVAL);
param.sched_priority = max_priority + 1;
ASSERT_EQ(LIBC_NAMESPACE::sched_setscheduler(0, policy, ¶m), -1);
// A bit hard to test as depending on user privileges we can run into
// different issues.
ASSERT_TRUE(libc_errno == EINVAL || libc_errno == EPERM);
libc_errno = 0;
param.sched_priority = min_priority;
// Success/unsupported policy/missing permissions.
int setscheduler_result =
LIBC_NAMESPACE::sched_setscheduler(0, policy, ¶m);
ASSERT_TRUE(setscheduler_result == 0 || setscheduler_result == -1);
ASSERT_TRUE(
setscheduler_result != -1
? (libc_errno == 0)
: ((!is_mandatory && libc_errno == EINVAL) || libc_errno == EPERM));
libc_errno = 0;
ASSERT_EQ(LIBC_NAMESPACE::sched_getscheduler(0),
setscheduler_result != -1 ? policy : init_policy);
ASSERT_ERRNO_SUCCESS();
// Out of bounds priority
param.sched_priority = -1;
ASSERT_EQ(LIBC_NAMESPACE::sched_setparam(0, ¶m), -1);
ASSERT_ERRNO_EQ(EINVAL);
param.sched_priority = max_priority + 1;
ASSERT_EQ(LIBC_NAMESPACE::sched_setparam(0, ¶m), -1);
ASSERT_ERRNO_EQ(EINVAL);
for (int priority = min_priority; priority <= max_priority; ++priority) {
ASSERT_EQ(LIBC_NAMESPACE::sched_getparam(0, ¶m), 0);
ASSERT_ERRNO_SUCCESS();
int init_priority = param.sched_priority;
param.sched_priority = priority;
// Negative pid
ASSERT_EQ(LIBC_NAMESPACE::sched_setparam(-1, ¶m), -1);
ASSERT_ERRNO_EQ(EINVAL);
ASSERT_EQ(LIBC_NAMESPACE::sched_getparam(-1, ¶m), -1);
ASSERT_ERRNO_EQ(EINVAL);
// Success/unsupported policy/missing permissions
int setparam_result = LIBC_NAMESPACE::sched_setparam(0, ¶m);
ASSERT_TRUE(setparam_result == 0 || setparam_result == -1);
ASSERT_TRUE(setparam_result != -1
? (libc_errno == 0)
: ((setscheduler_result == -1 && libc_errno == EINVAL) ||
libc_errno == EPERM));
libc_errno = 0;
ASSERT_EQ(LIBC_NAMESPACE::sched_getparam(0, ¶m), 0);
ASSERT_ERRNO_SUCCESS();
ASSERT_EQ(param.sched_priority,
setparam_result != -1 ? priority : init_priority);
}
// Null test
ASSERT_EQ(LIBC_NAMESPACE::sched_setscheduler(0, policy, nullptr), -1);
ASSERT_ERRNO_EQ(EINVAL);
}
};
#define LIST_SCHED_TESTS(policy, can_set) \
using LlvmLibcSchedTest = SchedTest; \
TEST_F(LlvmLibcSchedTest, Sched_##policy) { testSched(policy, can_set); }
// Mandated by POSIX.
LIST_SCHED_TESTS(SCHED_OTHER, true)
LIST_SCHED_TESTS(SCHED_FIFO, true)
LIST_SCHED_TESTS(SCHED_RR, true)
// Linux extensions.
LIST_SCHED_TESTS(SCHED_BATCH, true)
LIST_SCHED_TESTS(SCHED_IDLE, true)
TEST(LlvmLibcSchedParamAndSchedulerTest, NullParamTest) {
ASSERT_EQ(LIBC_NAMESPACE::sched_setparam(0, nullptr), -1);
ASSERT_ERRNO_EQ(EINVAL);
ASSERT_EQ(LIBC_NAMESPACE::sched_getparam(0, nullptr), -1);
ASSERT_ERRNO_EQ(EINVAL);
}
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