1 /*
2 * Copyright (c) 2022 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 <pthread.h>
17 #include <stdio.h>
18 #include <stdlib.h>
19 #include <string.h>
20 #include "test.h"
21
22 const char *path = "/data/test.txt";
23
child_func(void * p)24 void *child_func(void *p)
25 {
26 char buf[64];
27
28 FILE *filep = fopen(path, "r+");
29 if (filep == NULL) {
30 t_error("%s fopen failed\n", __func__);
31 }
32
33 flockfile(filep);
34
35 if (fseek(filep, 0L, SEEK_SET) == -1) {
36 t_error("%s fseek failed\n", __func__);
37 }
38 int ret = fread(buf, 64, 1, filep);
39
40 int count = atoi(buf);
41 ++count;
42
43 sprintf(buf, "%d", count);
44 if (fseek(filep, 0L, SEEK_SET) == -1) {
45 t_error("%s fseek failed\n", __func__);
46 }
47 ret = fwrite(buf, strlen(buf), 1, filep);
48
49 funlockfile(filep);
50
51 fclose(filep);
52 return NULL;
53 }
54
55 /**
56 * @tc.name : funlockfile_0100
57 * @tc.desc : Mutual exclusion has been tested in the test case of flockfile, so this test case tests that threads
58 * cannot be mutually exclusive for the case where each thread fopens a descriptor
59 * @tc.level : Level 0
60 */
funlockfile_0100(void)61 void funlockfile_0100(void)
62 {
63 pthread_t tid[100];
64
65 for (int i = 0; i < 100; i++) {
66 if (pthread_create(tid + i, NULL, child_func, NULL) != 0) {
67 t_error("%s pthread_create failed\n", __func__);
68 }
69 }
70
71 for (int j = 0; j < 100; j++) {
72 if (pthread_join(tid[j], NULL) != 0) {
73 t_error("%s pthread_join failed\n", __func__);
74 }
75 }
76 }
77
main(int argc,char * argv[])78 int main(int argc, char *argv[])
79 {
80 FILE *fp = fopen(path, "w+");
81 if (fp == NULL) {
82 t_error("%s fopen failed\n", __func__);
83 }
84 fclose(fp);
85
86 funlockfile_0100();
87
88 remove(path);
89 return t_status;
90 }