1/*
2 * Copyright 2016-present Facebook, Inc.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include <folly/portability/SysResource.h>
18
19#include <errno.h>
20
21#ifdef _WIN32
22#include <folly/portability/Windows.h>
23
24extern "C" {
25int getrlimit(int type, rlimit* dst) {
26 if (type == RLIMIT_STACK) {
27 NT_TIB* tib = (NT_TIB*)NtCurrentTeb();
28 dst->rlim_cur = (size_t)tib->StackBase - (size_t)tib->StackLimit;
29 dst->rlim_max = dst->rlim_cur;
30 return 0;
31 }
32 return -1;
33}
34
35int getrusage(int /* who */, rusage* usage) {
36 // You get NOTHING! Good day to you sir.
37 ZeroMemory(usage, sizeof(rusage));
38 return 0;
39}
40
41int setrlimit(int /* type */, rlimit* /* src */) {
42 // Do nothing for setting them for now.
43 // We couldn't set the stack size at runtime even if we wanted to.
44 return 0;
45}
46
47int getpriority(int which, int who) {
48 if (which != PRIO_PROCESS || who != 0) {
49 errno = EINVAL;
50 return -1;
51 }
52
53 auto ret = GetPriorityClass(GetCurrentProcess());
54 switch (ret) {
55 case 0:
56 errno = EACCES;
57 return -1;
58 case IDLE_PRIORITY_CLASS:
59 return 39;
60 case BELOW_NORMAL_PRIORITY_CLASS:
61 return 30;
62 case NORMAL_PRIORITY_CLASS:
63 return 20;
64 case ABOVE_NORMAL_PRIORITY_CLASS:
65 return 10;
66 case HIGH_PRIORITY_CLASS:
67 return 0;
68 case REALTIME_PRIORITY_CLASS:
69 // I'd return -1 if it weren't an error :(
70 // Realtime priority processes can't be set
71 // through these APIs because it's a terrible idea.
72 return 0;
73 default:
74 errno = EINVAL;
75 return -1;
76 }
77}
78
79int setpriority(int which, int who, int value) {
80 if (which != PRIO_PROCESS || who != 0) {
81 errno = EINVAL;
82 return -1;
83 }
84
85 auto newClass = [value] {
86 if (value >= 39) {
87 return IDLE_PRIORITY_CLASS;
88 } else if (value >= 30) {
89 return BELOW_NORMAL_PRIORITY_CLASS;
90 } else if (value >= 20) {
91 return NORMAL_PRIORITY_CLASS;
92 } else if (value >= 10) {
93 return ABOVE_NORMAL_PRIORITY_CLASS;
94 } else {
95 return HIGH_PRIORITY_CLASS;
96 }
97 }();
98
99 if (!SetPriorityClass(GetCurrentProcess(), newClass)) {
100 errno = EACCES;
101 return -1;
102 }
103 return 0;
104}
105}
106#endif
107