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//===-- Unittests for sched_rr_get_interval -------------------------------===//
//
// 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_min.h"
#include "src/sched/sched_getscheduler.h"
#include "src/sched/sched_rr_get_interval.h"
#include "src/sched/sched_setscheduler.h"
#include "src/unistd/getuid.h"
#include "test/UnitTest/Test.h"
#include <sched.h>
TEST(LlvmLibcSchedRRGetIntervalTest, SmokeTest) {
libc_errno = 0;
auto SetSched = [&](int policy) {
int min_priority = __llvm_libc::sched_get_priority_min(policy);
ASSERT_GE(min_priority, 0);
ASSERT_EQ(libc_errno, 0);
struct sched_param param;
param.sched_priority = min_priority;
ASSERT_EQ(__llvm_libc::sched_setscheduler(0, policy, ¶m), 0);
ASSERT_EQ(libc_errno, 0);
};
auto TimespecToNs = [](struct timespec t) {
return t.tv_sec * 1000UL * 1000UL * 1000UL + t.tv_nsec;
};
struct timespec ts;
// We can only set SCHED_RR with CAP_SYS_ADMIN
if (__llvm_libc::getuid() == 0)
SetSched(SCHED_RR);
int cur_policy = __llvm_libc::sched_getscheduler(0);
ASSERT_GE(cur_policy, 0);
ASSERT_EQ(libc_errno, 0);
// We can actually run meaningful tests.
if (cur_policy == SCHED_RR) {
// Success
ASSERT_EQ(__llvm_libc::sched_rr_get_interval(0, &ts), 0);
ASSERT_EQ(libc_errno, 0);
// Check that numbers make sense (liberal bound of 10ns - 30sec)
ASSERT_GT(TimespecToNs(ts), 10UL);
ASSERT_LT(TimespecToNs(ts), 30UL * 1000UL * 1000UL * 1000UL);
// Null timespec
ASSERT_EQ(__llvm_libc::sched_rr_get_interval(0, nullptr), -1);
ASSERT_EQ(libc_errno, EFAULT);
libc_errno = 0;
// Negative pid
ASSERT_EQ(__llvm_libc::sched_rr_get_interval(-1, &ts), -1);
ASSERT_EQ(libc_errno, EINVAL);
libc_errno = 0;
}
// Negative tests don't have SCHED_RR set
SetSched(SCHED_OTHER);
ASSERT_EQ(__llvm_libc::sched_rr_get_interval(0, &ts), 0);
ASSERT_EQ(libc_errno, 0);
libc_errno = 0;
// TODO: Missing unkown pid -> ESRCH. This is read only so safe to try a few
// unlikely values.
}
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