Input event hub for evdev input HAL module.

InputHub monitors paths for device changes and input events.
InputDeviceManager creates InputDevices and routes input events to
them. InputDevices currently just log these events during development.
InputHost represents a wrapper around the HAL interface.

Change-Id: Ic47d574498eb07bcdcd17812a648539fdf1c69d6
diff --git a/tests/input/evdev/TestHelpers.cpp b/tests/input/evdev/TestHelpers.cpp
new file mode 100644
index 0000000..63b579e
--- /dev/null
+++ b/tests/input/evdev/TestHelpers.cpp
@@ -0,0 +1,93 @@
+/*
+ * 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.
+ */
+
+#define LOG_TAG "TestHelpers"
+#define LOG_NDEBUG 0
+
+#include <dirent.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <utils/Log.h>
+
+#include "TestHelpers.h"
+
+namespace android {
+
+static const char kTmpDirTemplate[] = "/data/local/tmp/XXXXXX";
+
+TempFile::TempFile(const char* path) {
+    bool needTrailingSlash = path[strlen(path) - 1] != '/';
+    // name = path + XXXXXX + \0
+    size_t nameLen = strlen(path) + 6 + 1;
+    if (needTrailingSlash) nameLen++;
+
+    mName = new char[nameLen];
+    strcpy(mName, path);
+    if (needTrailingSlash) {
+        strcat(mName, "/");
+    }
+    strcat(mName, "XXXXXX");
+    mName = mktemp(mName);
+    LOG_FATAL_IF(mName == nullptr, "could not create temp filename %s. errno=%d", mName, errno);
+
+    int result = TEMP_FAILURE_RETRY(mkfifo(mName, S_IRWXU));
+    LOG_FATAL_IF(result < 0, "could not create fifo %s. errno=%d", mName, errno);
+
+    mFd = TEMP_FAILURE_RETRY(open(mName, O_RDWR | O_NONBLOCK));
+    LOG_FATAL_IF(mFd < 0, "could not open fifo %s. errno=%d", mName, errno);
+}
+
+TempFile::~TempFile() {
+    if (unlink(mName) < 0) {
+        ALOGE("could not unlink %s. errno=%d", mName, errno);
+    }
+    if (close(mFd) < 0) {
+        ALOGE("could not close %d. errno=%d", mFd, errno);
+    }
+    delete[] mName;
+}
+
+TempDir::TempDir() {
+    mName = new char[sizeof(kTmpDirTemplate)];
+    strcpy(mName, kTmpDirTemplate);
+    mName = mkdtemp(mName);
+    LOG_FATAL_IF(mName == nullptr, "could not allocate tempdir %s", mName);
+}
+
+TempDir::~TempDir() {
+    auto tmpDir = opendir(mName);
+    while (auto entry = readdir(tmpDir)) {
+        if (strcmp(entry->d_name, ".") == 0 ||
+            strcmp(entry->d_name, "..") == 0) {
+            continue;
+        }
+        ALOGD("stale file %s, removing", entry->d_name);
+        unlink(entry->d_name);
+    }
+    closedir(tmpDir);
+    rmdir(mName);
+    delete mName;
+}
+
+TempFile* TempDir::newTempFile() {
+    return new TempFile(mName);
+}
+
+}  // namespace android