Installing an Alternate SSL Provider on Android
At this point, the CyaSSL provider is fully installed into the Android platform. You can move on to building and testing the platform with the new provider installed. If no errors arise during the platform build, the provider can be loaded into the emulator to make sure the platform runs correctly with the new provider installed.
The build process can take a significant amount of time depending on the build environment. All commands should be run from the Android platform root:
$ source build/envsetup.sh [Sets environment variables] $ lunch 1 [Builds the emulator] $ make [Builds the Android Platform]
Keep in mind that it is possible to rebuild a single project (such as the CyaSSL shared library) to test that the shared library builds correctly using the mm command (shown below), but before testing in the emulator, a full platform build needs to be done:
$ cd external/cyassl $ mm
The Android platform build process results in three image files: <Android-Platform>/out/target/product/generic/ramdisk.img, <Android-Platform>/out/target/product/generic/system.img and <Android-Platform>/out/target/product/generic/userdata.img:
ramdisk.img — a small partition that is mounted as read-only by the kernel at boot time. It contains only /init and a few configuration files. It is used to start /init, which will boot the rest of the system images and run the init procedure.
system.img — a partition image that will be mounted as / and contains all system binaries. This is the image file that contains all of the changes that were made above.
userdata.img — this image is used only when the -wipe-data option is used with the emulator. In a normal emulator execution, a default userdata image will be used.
Of these, system.img is of the highest concern. It contains the majority of the system and all of the changes that have been made with the addition of the CyaSSL SSL provider.
Before you can use the Android Emulator, you must create an Android Virtual Device. Android Virtual Devices are configurations of emulator options that allow developers to model a physical Android device better. They hold configuration information, such as a hardware profile, a mapping to a system image and a dedicated storage area. To create an Android Virtual Device, the android application is used. This application is found under the tools directory of the SDK. Create a new Virtual Device using the following command (issued from the SDK /tools directory):
$ android create avd -n <desired-name> -t <target-version>
where <desired-name> is the name of the Android Virtual Device and <target-version> is the desired target platform. Run the following command to view available targets:
$ android list targets
After the Android Virtual Device has been created, load the emulator with the built images:
$ emulator -avd <virtual-device-name> -system <Android-Platform>/out/target/product/generic/system.img -data <Android-Platform>/out/target/product/generic/userdata.img -ramdisk <Android-Platform>/out/target/product/generic/ramdisk.img
There are other useful emulator options that may be added to the above command. A few are listed below, but for a complete list see the official Android Emulator Web page:
-verbose — verbose output.
-nocache — don't use a cache.
-show-kernel — print kernel messages to the terminal window.
Once the emulator is running, the logcat output can be viewed in a new terminal window (assuming the current directory is <Android-SDK>/tools):
$ adb logcat
In this article, installing an alternative SSL provider into the Android platform is explained using CyaSSL. By using CyaSSL in the Android platform instead of OpenSSL, developers are able to leverage both the speed and size advantages of the CyaSSL library. Making use of both a shared library and JNI, the same general process could apply to installing other third-party libraries into the Android platform and could provide a good reference for developers moving C libraries over to Android from other operating environments.
Practical Task Scheduling Deployment
One of the best things about the UNIX environment (aside from being stable and efficient) is the vast array of software tools available to help you do your job. Traditionally, a UNIX tool does only one thing, but does that one thing very well. For example, grep is very easy to use and can search vast amounts of data quickly. The find tool can find a particular file or files based on all kinds of criteria. It's pretty easy to string these tools together to build even more powerful tools, such as a tool that finds all of the .log files in the /home directory and searches each one for a particular entry. This erector-set mentality allows UNIX system administrators to seem to always have the right tool for the job.
Cron traditionally has been considered another such a tool for job scheduling, but is it enough? This webinar considers that very question. The first part builds on a previous Geek Guide, Beyond Cron, and briefly describes how to know when it might be time to consider upgrading your job scheduling infrastructure. The second part presents an actual planning and implementation framework.
Join Linux Journal's Mike Diehl and Pat Cameron of Help Systems.
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- The Firebird Project's Firebird Relational Database
- SUSE LLC's SUSE Manager
- Murat Yener and Onur Dundar's Expert Android Studio (Wrox)
- Managing Linux Using Puppet
- My +1 Sword of Productivity
- Non-Linux FOSS: Caffeine!
- Google's SwiftShader Released
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- Doing for User Space What We Did for Kernel Space
With all the industry talk about the benefits of Linux on Power and all the performance advantages offered by its open architecture, you may be considering a move in that direction. If you are thinking about analytics, big data and cloud computing, you would be right to evaluate Power. The idea of using commodity x86 hardware and replacing it every three years is an outdated cost model. It doesn’t consider the total cost of ownership, and it doesn’t consider the advantage of real processing power, high-availability and multithreading like a demon.
This ebook takes a look at some of the practical applications of the Linux on Power platform and ways you might bring all the performance power of this open architecture to bear for your organization. There are no smoke and mirrors here—just hard, cold, empirical evidence provided by independent sources. I also consider some innovative ways Linux on Power will be used in the future.Get the Guide