1 /*
2 * Copyright (C) 2017 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 #include "directory.h"
18
19 #include <android-base/stringprintf.h>
20
Directory(const char * path)21 procfsinspector::Directory::Directory(const char* path) {
22 if (path && path[0]) {
23 mPath.assign(path);
24 mDirectory.reset(opendir(path));
25 }
26 }
27
isEmpty() const28 bool procfsinspector::Directory::Entry::isEmpty() const {
29 return mParent.empty() && mChild.empty();
30 }
31
Entry(std::string parent,std::string child)32 procfsinspector::Directory::Entry::Entry(std::string parent, std::string child) :
33 mParent(parent), mChild(child) {
34 if (!isEmpty()) {
35 if (mParent.back() != '/') {
36 mParent += '/';
37 }
38 }
39 }
40
str()41 std::string procfsinspector::Directory::Entry::str() {
42 return mParent + mChild;
43 }
44
getOwnerUserId()45 uid_t procfsinspector::Directory::Entry::getOwnerUserId() {
46 if (isEmpty()) {
47 return -1;
48 }
49 struct stat buf;
50 // fill in stat info for this entry, or return invalid UID on failure
51 if (stat(str().c_str(), &buf)) {
52 return -1;
53 }
54 return buf.st_uid;
55 }
56
next(unsigned char type)57 procfsinspector::Directory::Entry procfsinspector::Directory::next(unsigned char type) {
58 if (auto dir = mDirectory.get()) {
59 dirent *entry = readdir(dir);
60 if (entry) {
61 // only return entries of the right type (regular file, directory, ...)
62 // but always return UNKNOWN entries as it is an allowed wildcard entry
63 if (entry->d_type == DT_UNKNOWN ||
64 type == DT_UNKNOWN ||
65 entry->d_type == type) {
66 return Entry(mPath, entry->d_name);
67 }
68 }
69 }
70
71 return Entry();
72 }
73