1 /*
2 * Copyright (C) 2005 The Android Open Source Project
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 #define LOG_TAG "misc"
18
19 //
20 // Miscellaneous utility functions.
21 //
22 #include <utils/misc.h>
23 #include <utils/Log.h>
24
25 #include <sys/stat.h>
26 #include <string.h>
27 #include <errno.h>
28 #include <assert.h>
29 #include <stdio.h>
30
31 #if defined(HAVE_PTHREADS)
32 # include <pthread.h>
33 #endif
34
35 #include <utils/Vector.h>
36
37 using namespace android;
38
39 namespace android {
40
41 /*
42 * Get a file's type.
43 */
getFileType(const char * fileName)44 FileType getFileType(const char* fileName)
45 {
46 struct stat sb;
47
48 if (stat(fileName, &sb) < 0) {
49 if (errno == ENOENT || errno == ENOTDIR)
50 return kFileTypeNonexistent;
51 else {
52 fprintf(stderr, "getFileType got errno=%d on '%s'\n",
53 errno, fileName);
54 return kFileTypeUnknown;
55 }
56 } else {
57 if (S_ISREG(sb.st_mode))
58 return kFileTypeRegular;
59 else if (S_ISDIR(sb.st_mode))
60 return kFileTypeDirectory;
61 else if (S_ISCHR(sb.st_mode))
62 return kFileTypeCharDev;
63 else if (S_ISBLK(sb.st_mode))
64 return kFileTypeBlockDev;
65 else if (S_ISFIFO(sb.st_mode))
66 return kFileTypeFifo;
67 #ifdef HAVE_SYMLINKS
68 else if (S_ISLNK(sb.st_mode))
69 return kFileTypeSymlink;
70 else if (S_ISSOCK(sb.st_mode))
71 return kFileTypeSocket;
72 #endif
73 else
74 return kFileTypeUnknown;
75 }
76 }
77
78 /*
79 * Get a file's modification date.
80 */
getFileModDate(const char * fileName)81 time_t getFileModDate(const char* fileName)
82 {
83 struct stat sb;
84
85 if (stat(fileName, &sb) < 0)
86 return (time_t) -1;
87
88 return sb.st_mtime;
89 }
90
91 struct sysprop_change_callback_info {
92 sysprop_change_callback callback;
93 int priority;
94 };
95
96 #if defined(HAVE_PTHREADS)
97 static pthread_mutex_t gSyspropMutex = PTHREAD_MUTEX_INITIALIZER;
98 static Vector<sysprop_change_callback_info>* gSyspropList = NULL;
99 #endif
100
add_sysprop_change_callback(sysprop_change_callback cb,int priority)101 void add_sysprop_change_callback(sysprop_change_callback cb, int priority) {
102 #if defined(HAVE_PTHREADS)
103 pthread_mutex_lock(&gSyspropMutex);
104 if (gSyspropList == NULL) {
105 gSyspropList = new Vector<sysprop_change_callback_info>();
106 }
107 sysprop_change_callback_info info;
108 info.callback = cb;
109 info.priority = priority;
110 bool added = false;
111 for (size_t i=0; i<gSyspropList->size(); i++) {
112 if (priority >= gSyspropList->itemAt(i).priority) {
113 gSyspropList->insertAt(info, i);
114 added = true;
115 break;
116 }
117 }
118 if (!added) {
119 gSyspropList->add(info);
120 }
121 pthread_mutex_unlock(&gSyspropMutex);
122 #endif
123 }
124
report_sysprop_change()125 void report_sysprop_change() {
126 #if defined(HAVE_PTHREADS)
127 pthread_mutex_lock(&gSyspropMutex);
128 Vector<sysprop_change_callback_info> listeners;
129 if (gSyspropList != NULL) {
130 listeners = *gSyspropList;
131 }
132 pthread_mutex_unlock(&gSyspropMutex);
133
134 //ALOGI("Reporting sysprop change to %d listeners", listeners.size());
135 for (size_t i=0; i<listeners.size(); i++) {
136 listeners[i].callback();
137 }
138 #endif
139 }
140
141 }; // namespace android
142