1 /* //device/libs/android_runtime/android_util_Process.cpp
2 **
3 ** Copyright 2006, The Android Open Source Project
4 **
5 ** Licensed under the Apache License, Version 2.0 (the "License");
6 ** you may not use this file except in compliance with the License.
7 ** You may obtain a copy of the License at
8 **
9 ** http://www.apache.org/licenses/LICENSE-2.0
10 **
11 ** Unless required by applicable law or agreed to in writing, software
12 ** distributed under the License is distributed on an "AS IS" BASIS,
13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 ** See the License for the specific language governing permissions and
15 ** limitations under the License.
16 */
17
18 #define LOG_TAG "FileUtils"
19
20 #include <utils/Log.h>
21
22 #include <android_runtime/AndroidRuntime.h>
23
24 #include "JNIHelp.h"
25
26 #include <sys/errno.h>
27 #include <sys/stat.h>
28 #include <sys/types.h>
29 #include <fcntl.h>
30 #include <signal.h>
31 #include <sys/ioctl.h>
32 #include <linux/msdos_fs.h>
33
34 namespace android {
35
android_os_FileUtils_setPermissions(JNIEnv * env,jobject clazz,jstring file,jint mode,jint uid,jint gid)36 jint android_os_FileUtils_setPermissions(JNIEnv* env, jobject clazz,
37 jstring file, jint mode,
38 jint uid, jint gid)
39 {
40 const jchar* str = env->GetStringCritical(file, 0);
41 String8 file8;
42 if (str) {
43 file8 = String8(str, env->GetStringLength(file));
44 env->ReleaseStringCritical(file, str);
45 }
46 if (file8.size() <= 0) {
47 return ENOENT;
48 }
49 if (uid >= 0 || gid >= 0) {
50 int res = chown(file8.string(), uid, gid);
51 if (res != 0) {
52 return errno;
53 }
54 }
55 return chmod(file8.string(), mode) == 0 ? 0 : errno;
56 }
57
android_os_FileUtils_getFatVolumeId(JNIEnv * env,jobject clazz,jstring path)58 jint android_os_FileUtils_getFatVolumeId(JNIEnv* env, jobject clazz, jstring path)
59 {
60 if (path == NULL) {
61 jniThrowException(env, "java/lang/IllegalArgumentException", NULL);
62 return -1;
63 }
64 const char *pathStr = env->GetStringUTFChars(path, NULL);
65 int result = -1;
66 // only if our system supports this ioctl
67 #ifdef VFAT_IOCTL_GET_VOLUME_ID
68 int fd = open(pathStr, O_RDONLY);
69 if (fd >= 0) {
70 result = ioctl(fd, VFAT_IOCTL_GET_VOLUME_ID);
71 close(fd);
72 }
73 #endif
74
75 env->ReleaseStringUTFChars(path, pathStr);
76 return result;
77 }
78
79 static const JNINativeMethod methods[] = {
80 {"setPermissions", "(Ljava/lang/String;III)I", (void*)android_os_FileUtils_setPermissions},
81 {"getFatVolumeId", "(Ljava/lang/String;)I", (void*)android_os_FileUtils_getFatVolumeId},
82 };
83
84 static const char* const kFileUtilsPathName = "android/os/FileUtils";
85
register_android_os_FileUtils(JNIEnv * env)86 int register_android_os_FileUtils(JNIEnv* env)
87 {
88 return AndroidRuntime::registerNativeMethods(
89 env, kFileUtilsPathName,
90 methods, NELEM(methods));
91 }
92
93 }
94