1 // Copyright 2017 The Chromium Authors
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include <optional>
6
7 #include "base/android/jni_array.h"
8 #include "base/android/jni_string.h"
9 #include "base/android/library_loader/library_loader_hooks.h"
10 #include "base/debug/dump_without_crashing.h"
11 #include "base/file_descriptor_store.h"
12 #include "base/logging.h"
13 #include "base/posix/global_descriptors.h"
14 #include "base/process_launcher_jni/ChildProcessService_jni.h"
15
16 using base::android::JavaIntArrayToIntVector;
17 using base::android::JavaParamRef;
18
19 namespace base {
20 namespace android {
21
JNI_ChildProcessService_RegisterFileDescriptors(JNIEnv * env,const JavaParamRef<jobjectArray> & j_keys,const JavaParamRef<jintArray> & j_ids,const JavaParamRef<jintArray> & j_fds,const JavaParamRef<jlongArray> & j_offsets,const JavaParamRef<jlongArray> & j_sizes)22 void JNI_ChildProcessService_RegisterFileDescriptors(
23 JNIEnv* env,
24 const JavaParamRef<jobjectArray>& j_keys,
25 const JavaParamRef<jintArray>& j_ids,
26 const JavaParamRef<jintArray>& j_fds,
27 const JavaParamRef<jlongArray>& j_offsets,
28 const JavaParamRef<jlongArray>& j_sizes) {
29 std::vector<std::optional<std::string>> keys;
30 JavaObjectArrayReader<jstring> keys_array(j_keys);
31 keys.reserve(checked_cast<size_t>(keys_array.size()));
32 for (auto str : keys_array) {
33 std::optional<std::string> key;
34 if (str) {
35 key = base::android::ConvertJavaStringToUTF8(env, str);
36 }
37 keys.push_back(std::move(key));
38 }
39
40 std::vector<int> ids;
41 base::android::JavaIntArrayToIntVector(env, j_ids, &ids);
42 std::vector<int> fds;
43 base::android::JavaIntArrayToIntVector(env, j_fds, &fds);
44 std::vector<int64_t> offsets;
45 base::android::JavaLongArrayToInt64Vector(env, j_offsets, &offsets);
46 std::vector<int64_t> sizes;
47 base::android::JavaLongArrayToInt64Vector(env, j_sizes, &sizes);
48
49 DCHECK_EQ(keys.size(), ids.size());
50 DCHECK_EQ(ids.size(), fds.size());
51 DCHECK_EQ(fds.size(), offsets.size());
52 DCHECK_EQ(offsets.size(), sizes.size());
53
54 for (size_t i = 0; i < ids.size(); i++) {
55 base::MemoryMappedFile::Region region = {offsets.at(i),
56 static_cast<size_t>(sizes.at(i))};
57 const std::optional<std::string>& key = keys.at(i);
58 const auto id = static_cast<GlobalDescriptors::Key>(ids.at(i));
59 int fd = fds.at(i);
60 if (key) {
61 base::FileDescriptorStore::GetInstance().Set(*key, base::ScopedFD(fd),
62 region);
63 } else {
64 base::GlobalDescriptors::GetInstance()->Set(id, fd, region);
65 }
66 }
67 }
68
JNI_ChildProcessService_ExitChildProcess(JNIEnv * env)69 void JNI_ChildProcessService_ExitChildProcess(JNIEnv* env) {
70 VLOG(0) << "ChildProcessService: Exiting child process.";
71 base::android::LibraryLoaderExitHook();
72 _exit(0);
73 }
74
75 // Make sure this isn't inlined so it shows up in stack traces.
76 // the function body unique by adding a log line, so it doesn't get merged
77 // with other functions by link time optimizations (ICF).
JNI_ChildProcessService_DumpProcessStack(JNIEnv * env)78 NOINLINE void JNI_ChildProcessService_DumpProcessStack(JNIEnv* env) {
79 LOG(ERROR) << "Dumping as requested.";
80 base::debug::DumpWithoutCrashing();
81 }
82
83 } // namespace android
84 } // namespace base
85