1 /*
2 * Copyright (c) 2023 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16 #include "common/napi_helper.cpp"
17 #include "common/native_common.h"
18 #include "napi/native_api.h"
19 #include <sys/sem.h>
20
21 #define PARAM_0 0
22 #define PARAM_1 1
23 #define ONEVAL 1
24 #define MINUSONE (-1)
25 #define TEST_MODE 0666
26 #define PARAM_EACCES 13
27
Semop(napi_env env, napi_callback_info info)28 static napi_value Semop(napi_env env, napi_callback_info info)
29 {
30 static const char path[] = ".";
31 static const int id = 's';
32 struct sembuf sops = {PARAM_0};
33 key_t k = ftok(path, id);
34 sops.sem_num = PARAM_0;
35 sops.sem_op = MINUSONE;
36 sops.sem_flg = PARAM_0;
37 int semid = semget(k, PARAM_0, PARAM_0);
38 int semval = semop(semid, &sops, ONEVAL);
39 napi_value result = nullptr;
40 napi_create_int32(env, semval, &result);
41 return result;
42 }
Semtimedop(napi_env env, napi_callback_info info)43 static napi_value Semtimedop(napi_env env, napi_callback_info info)
44 {
45 static const char path[] = ".";
46 static const int id = 's';
47 struct sembuf sops = {PARAM_0};
48 key_t k = ftok(path, id);
49 sops.sem_num = PARAM_0;
50 sops.sem_op = MINUSONE;
51 sops.sem_flg = PARAM_0;
52 int semid = semget(k, PARAM_0, PARAM_0);
53 int semval = semtimedop(semid, &sops, ONEVAL, nullptr);
54 napi_value result = nullptr;
55 napi_create_int32(env, semval, &result);
56 return result;
57 }
58
Semctl(napi_env env, napi_callback_info info)59 static napi_value Semctl(napi_env env, napi_callback_info info)
60 {
61 size_t argc = PARAM_1;
62 napi_value args[1] = {nullptr};
63 napi_get_cb_info(env, info, &argc, args, nullptr, nullptr);
64 int valueFirst;
65 napi_get_value_int32(env, args[0], &valueFirst);
66 static const char path[] = ".";
67 static const int id = 's';
68 key_t k = ftok(path, id);
69 int semid = semget(k, ONEVAL, IPC_CREAT | TEST_MODE);
70 if (valueFirst == PARAM_0) {
71 int semval = semctl(semid, PARAM_0, GETVAL);
72 if (semval == PARAM_EACCES) {
73 napi_value result;
74 napi_create_int32(env, semval, &result);
75 return result;
76 } else {
77 napi_value result;
78 napi_create_int32(env, ONEVAL, &result);
79 return result;
80 }
81 }
82 return nullptr;
83 }
84
Semget(napi_env env, napi_callback_info info)85 static napi_value Semget(napi_env env, napi_callback_info info)
86 {
87 static const char path[] = ".";
88 static const int id = 's';
89 key_t k = ftok(path, id);
90 int semval = semget(k, ONEVAL, IPC_CREAT | TEST_MODE);
91 napi_value result;
92 napi_create_int32(env, semval, &result);
93 return result;
94 }
95 EXTERN_C_START
Init(napi_env env, napi_value exports)96 static napi_value Init(napi_env env, napi_value exports)
97 {
98 napi_property_descriptor desc[] = {
99 {"semop", nullptr, Semop, nullptr, nullptr, nullptr, napi_default, nullptr},
100 {"semtimedop", nullptr, Semtimedop, nullptr, nullptr, nullptr, napi_default, nullptr},
101 {"semctl", nullptr, Semctl, nullptr, nullptr, nullptr, napi_default, nullptr},
102 {"semget", nullptr, Semget, nullptr, nullptr, nullptr, napi_default, nullptr},
103 };
104 napi_define_properties(env, exports, sizeof(desc) / sizeof(desc[0]), desc);
105 return exports;
106 }
107
108 EXTERN_C_END
109
110 static napi_module demoModule = {
111 .nm_version = 1,
112 .nm_flags = 0,
113 .nm_filename = nullptr,
114 .nm_register_func = Init,
115 .nm_modname = "sem",
116 .nm_priv = ((void *)0),
117 .reserved = {0},
118 };
119
RegisterEntryModule(void)120 extern "C" __attribute__((constructor)) void RegisterEntryModule(void) { napi_module_register(&demoModule); }
121