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“K64″ is what Apple refers to as the 64-bit version of the kernel beginning with Snow Leopard. As an end user, you really should not worry about the bitness of the kernel. If your Apple computer is not booting into K64 by default, you don’t need it—unless, of course, you know that you need it. (Say, because you are a kernel developer or an otherwise system-level developer and want to test somethin

What is Mac OS X? © Amit Singh. All Rights Reserved.Written in December 2003 Mac OS X Hacking Tools Hacking? Tool? The Jargon File is a popular lexicographic resource amongst hackers (and non-hackers too). Although it might have some subjective definitions I may not agree with, I have conveniently quoted verbatim the definitions of the terms "hacker" and "tool" as a preface to the contents of this

© Amit Singh. All Rights Reserved. Written in December 2007 Processes as Files A while ago, I wrote about procfs for Mac OS X, a MacFUSE-based file system. Subsequently, I added more cool features to my procfs implementation. Recently, I had reason to demonstrate procfs again and realized that I needed still more cool features. That need led to GrabFS. Screenshots as Files In a pinch, GrabFS is a

© Amit Singh. All Rights Reserved. Written in May 2005 Background Spotlight was a highly anticipated feature of Mac OS X 10.4 "Tiger". From a technical standpoint, you could think of Spotlight as roughly encompassing the following: An in-kernel notification mechanism that can inform user-space "subscribers" of file system changes as they happen. A database of various types of file-related informat

© Amit Singh. All Rights Reserved. Written in May 2007 Processes as Files The process file system ("procfs" for brevity, or simply "/proc", because that's where it is usually mounted) has become a common entity on Unix-like systems. For example, Solaris, Linux, and the various modern BSDs all have procfs. In general, procfs uses the file metaphor to provide both a view of currently running process

Mac OS X Internals is a flash conversion of a talk I recently gave about the Book. Although the conversion is fine (since it allows the presentation to be "driven" within a web browser), it is far from being a visually faithful conversion. Therefore, as they say, "this presentation has been formatted for this screen..."