1//===-- Unittests for sched_rr_get_interval -------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#include "src/__support/libc_errno.h"
10#include "src/sched/sched_get_priority_min.h"
11#include "src/sched/sched_getscheduler.h"
12#include "src/sched/sched_rr_get_interval.h"
13#include "src/sched/sched_setscheduler.h"
14#include "src/unistd/getuid.h"
15#include "test/UnitTest/Test.h"
16
17#include <sched.h>
18
19TEST(LlvmLibcSchedRRGetIntervalTest, SmokeTest) {
20 libc_errno = 0;
21 auto SetSched = [&](int policy) {
22 int min_priority = LIBC_NAMESPACE::sched_get_priority_min(policy);
23 ASSERT_GE(min_priority, 0);
24 ASSERT_ERRNO_SUCCESS();
25 struct sched_param param;
26 param.sched_priority = min_priority;
27 ASSERT_EQ(LIBC_NAMESPACE::sched_setscheduler(0, policy, &param), 0);
28 ASSERT_ERRNO_SUCCESS();
29 };
30
31 auto TimespecToNs = [](struct timespec t) {
32 return static_cast<uint64_t>(t.tv_sec * 1000UL * 1000UL * 1000UL +
33 t.tv_nsec);
34 };
35
36 struct timespec ts;
37
38 // We can only set SCHED_RR with CAP_SYS_ADMIN
39 if (LIBC_NAMESPACE::getuid() == 0)
40 SetSched(SCHED_RR);
41
42 int cur_policy = LIBC_NAMESPACE::sched_getscheduler(0);
43 ASSERT_GE(cur_policy, 0);
44 ASSERT_ERRNO_SUCCESS();
45
46 // We can actually run meaningful tests.
47 if (cur_policy == SCHED_RR) {
48 // Success
49 ASSERT_EQ(LIBC_NAMESPACE::sched_rr_get_interval(0, &ts), 0);
50 ASSERT_ERRNO_SUCCESS();
51
52 // Check that numbers make sense (liberal bound of 10ns - 30sec)
53 constexpr uint64_t tenNs = 10UL;
54 ASSERT_GT(TimespecToNs(ts), tenNs);
55 constexpr uint64_t thirstyS = 30UL * 1000UL * 1000UL * 1000UL;
56 ASSERT_LT(TimespecToNs(ts), thirstyS);
57
58 // Null timespec
59 ASSERT_EQ(LIBC_NAMESPACE::sched_rr_get_interval(0, nullptr), -1);
60 ASSERT_ERRNO_EQ(EFAULT);
61 libc_errno = 0;
62
63 // Negative pid
64 ASSERT_EQ(LIBC_NAMESPACE::sched_rr_get_interval(-1, &ts), -1);
65 ASSERT_ERRNO_EQ(EINVAL);
66 libc_errno = 0;
67 }
68
69 // Negative tests don't have SCHED_RR set
70 SetSched(SCHED_OTHER);
71 ASSERT_EQ(LIBC_NAMESPACE::sched_rr_get_interval(0, &ts), 0);
72 ASSERT_ERRNO_SUCCESS();
73 libc_errno = 0;
74
75 // TODO: Missing unkown pid -> ESRCH. This is read only so safe to try a few
76 // unlikely values.
77}
78

source code of libc/test/src/sched/sched_rr_get_interval_test.cpp