Add library for working with Android

This adds a couple of helper functions for working within Android:
- in_android(): Crude test that uses getenv() to see if an Android-
specific environment variable is defined.

- android_tmpdir_path(): Android doesn't have the usual locations for
temporary file storage such as /tmp or even /var/run/locks. And to
make matters worse, there isn't even a standard location for
temporary files so it must be determined at run time.

This will be used in a follow-up patch.

BUG=chrome-os-partner:49527
BRANCH=none
TEST=tested on smaug

Change-Id: Ifb5fb4067fffb7c8cb2d4350ca4a223e884d3aa5
Signed-off-by: David Hendricks <dhendrix@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/329299
Reviewed-by: Shawn N <shawnn@chromium.org>

1 files changed, 54 insertions, 0 deletions

diff --git a/util/lock/android.h b/util/lock/android.h
new file mode 100644
index 0000000000..bb08486919
--- /dev/null
+++ b/util/lock/android.h
@@ -0,0 +1,54 @@
+/*
+ * Copyright 2016, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *    * Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *    * Redistributions in binary form must reproduce the above
+ *      copyright notice, this list of conditions and the following
+ *      disclaimer in the documentation and/or other materials provided
+ *      with the distribution.
+ *    * Neither the name of Google Inc. nor the names of its
+ *      contributors may be used to endorse or promote products derived
+ *      from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ */
+
+#ifndef ANDROID_H__
+#define ANDROID_H__
+
+/*
+ * in_android - Test to see if the underlying OS is Android
+ *
+ * returns boolean 1 to indicate true, 0 otherwise
+ */
+extern int in_android(void);
+
+/**
+ * Determine where temporary files go.
+ *
+ * @return A pointer to value of directory containing temporary files if
+ *         successful, or NULL otherwise
+ */
+extern char *android_tmpdir_path(void);
+
+#endif