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/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "aidl_test_client_file_descriptors.h"
#include <iostream>
#include <vector>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <android-base/unique_fd.h>
// libbase
using android::base::unique_fd;
// libutils:
using android::sp;
// libbinder:
using android::binder::Status;
// generated
using android::aidl::tests::ITestService;
using std::cerr;
using std::cout;
using std::endl;
using std::string;
using std::vector;
namespace android {
namespace aidl {
namespace tests {
namespace client {
#define FdByName(_fd) #_fd, _fd
bool DoWrite(string name, const unique_fd& fd, const string& buf) {
int wrote;
while ((wrote = write(fd.get(), buf.data(), buf.size())) < 0 && errno == EINTR);
if (wrote == (signed)buf.size()) {
return true;
}
if (wrote < 0) {
cerr << "Error writing to file descriptor '" << name << "': "
<< strerror(errno) << endl;
} else {
cerr << "File descriptor '" << name << "'accepted short data." << endl;
}
return false;
}
bool DoRead(string name, const unique_fd& fd, const string& expected) {
size_t length = expected.size();
int got;
string buf;
buf.resize(length);
while ((got = read(fd.get(), &buf[0], length)) < 0 && errno == EINTR);
if (got < 0) {
cerr << "Error reading from '" << name << "': " << strerror(errno) << endl;
return false;
}
if (buf != expected) {
cerr << "Expected '" << expected << "' got '" << buf << "'" << endl;
return false;
}
return true;
}
bool DoPipe(unique_fd* read_side, unique_fd* write_side) {
int fds[2];
unique_fd return_fd;
if (pipe(fds)) {
cout << "Error creating pipes: " << strerror(errno) << endl;
return false;
}
read_side->reset(fds[0]);
write_side->reset(fds[1]);
return true;
}
bool ConfirmFileDescriptors(const sp<ITestService>& s) {
Status status;
cout << "Confirming passing and returning file descriptors works." << endl;
unique_fd return_fd;
unique_fd read_fd;
unique_fd write_fd;
if (!DoPipe(&read_fd, &write_fd)) {
return false;
}
status = s->RepeatFileDescriptor(write_fd, &return_fd);
if (!status.isOk()) {
cerr << "Could not repeat file descriptors." << endl;
return false;
}
/* A note on some of the spookier stuff going on here: IIUC writes to pipes
* should be atomic and non-blocking so long as the total size doesn't exceed
* PIPE_BUF. We thus play a bit fast and loose with failure modes here.
*/
bool ret =
DoWrite(FdByName(return_fd), "ReturnString") &&
DoRead(FdByName(read_fd), "ReturnString");
return ret;
}
bool ConfirmFileDescriptorArrays(const sp<ITestService>& s) {
Status status;
cout << "Confirming passing and returning file descriptor arrays works." << endl;
vector<unique_fd> array;
array.resize(2);
if (!DoPipe(&array[0], &array[1])) {
return false;
}
vector<unique_fd> repeated;
vector<unique_fd> reversed;
status = s->ReverseFileDescriptorArray(array, &repeated, &reversed);
if (!status.isOk()) {
cerr << "Could not reverse file descriptor array." << endl;
return false;
}
bool ret =
DoWrite(FdByName(array[1]), "First") &&
DoWrite(FdByName(repeated[1]), "Second") &&
DoWrite(FdByName(reversed[0]), "Third") &&
DoRead(FdByName(reversed[1]), "FirstSecondThird");
return ret;
}
} // namespace client
} // namespace tests
} // namespace aidl
} // namespace android
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