What is Mac OS X Boot Process:
The Mac OS X boot process involves several stages, in which the operating system performs various tasks to prepare the system for use.
- When the Mac is powered on, the firmware (a low-level software that controls the hardware) performs a power-on self-test (POST) to check the hardware components.
- The firmware loads the bootloader, which is responsible for loading the operating system kernel and transferring control to it. In Mac OS X, the bootloader is called the boot.efi file.
- The operating system kernel, which is the core of the operating system, initializes the system and starts the system services.
- The system services, such as the device drivers, are loaded and initialized.
- The operating system loads the user profile and starts the user interface, such as the desktop or the login screen.
- The user can log in and start using the system.
This is a general overview of the Mac OS X boot process. The exact sequence of events may vary depending on the specific version of Mac OS X and the hardware configuration of the system.
Boot ROM | Firmware. Part of Hardware system BootROM firmware is activated |
POST | Power-On Self Test initializes some hardware interfaces and verifies that sufficient memory is available and in a good state. |
EFI | Extensible Firmware Interface EFI does basic hardware initialization and selects which operating system to use. |
BOOTX | boot.efi boot loader load the kernel environment |
Rooting/Kernel | The init routine of the kernel is executed boot loader starts the kernel’s initialization procedure Various Mach/BSD data structures are initialized by the kernel. The I/O Kit is initialized. The kernel starts /sbin/mach_init |
Run Level | mach_init starts /sbin/init init determines the runlevel, and runs /etc/rc.boot, which sets up the machine enough to run single-user. rc.boot figures out the type of boot (Multi-User, Safe, CD-ROM, Network etc.) |
- Power is turned on.
- Open Firmware code is executed.
- Hardware information is collected and hardware is initialized.
- Something (usually the OS, but also things like the Apple Hardware Test, etc.) is selected to boot. The user may be prompted to select what to boot.
- Control passes to /System/Library/CoreServices/BootX, the boot loader. BootX loads the kernel and also draws the OS badges, if any.
- BootX tries to load a previously cached list of device drivers (created/updated by /usr/sbin/kextcache). Such a cache is of the type mkext and contains the info dictionaries and binary files for multiple kernel extensions. Note that if the mkext cache is corrupt or missing, BootX would look in /System/Library/Extensions for extensions that are needed in the current scenario (as determined by the value of the OSBundleRequired property in the Info.plist file of the extension’s bundle.
- The init routine of the kernel is executed. The root device of the booting system is determined. At this point, Open Firmware is not accessible any more.
- Various Mach/BSD data structures are initialized by the kernel.
- The I/O Kit is initialized.
- The kernel starts /sbin/mach_init, the Mach service naming (bootstrap) daemon. mach_init maintains mappings between service names and the Mach ports that provide access to those services.
From here on, the startup becomes user-level:
- mach_init starts /sbin/init, the traditional BSD init process. init determines the runlevel, and runs /etc/rc.boot, which sets up the machine enough to run single-user.
- rc.boot figures out the type of boot (Multi-User, Safe, CD-ROM, Network etc.). In case of a network boot (the sysctl variable kern.netboot will be set to 1 in which case), it runs /etc/rc.netboot with a start argument.
Source: http://osxbook.com/book/bonus/ancient/whatismacosx/arch_startup.html
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List of Freely available programming books - What is the single most influential book every Programmers should read
- Bjarne Stroustrup - The C++ Programming Language
- Brian W. Kernighan, Rob Pike - The Practice of Programming
- Donald Knuth - The Art of Computer Programming
- Ellen Ullman - Close to the Machine
- Ellis Horowitz - Fundamentals of Computer Algorithms
- Eric Raymond - The Art of Unix Programming
- Gerald M. Weinberg - The Psychology of Computer Programming
- James Gosling - The Java Programming Language
- Joel Spolsky - The Best Software Writing I
- Keith Curtis - After the Software Wars
- Richard M. Stallman - Free Software, Free Society
- Richard P. Gabriel - Patterns of Software
- Richard P. Gabriel - Innovation Happens Elsewhere
- Code Complete (2nd edition) by Steve McConnell
- The Pragmatic Programmer
- Structure and Interpretation of Computer Programs
- The C Programming Language by Kernighan and Ritchie
- Introduction to Algorithms by Cormen, Leiserson, Rivest & Stein
- Design Patterns by the Gang of Four
- Refactoring: Improving the Design of Existing Code
- The Mythical Man Month
- The Art of Computer Programming by Donald Knuth
- Compilers: Principles, Techniques and Tools by Alfred V. Aho, Ravi Sethi and Jeffrey D. Ullman
- Gödel, Escher, Bach by Douglas Hofstadter
- Clean Code: A Handbook of Agile Software Craftsmanship by Robert C. Martin
- Effective C++
- More Effective C++
- CODE by Charles Petzold
- Programming Pearls by Jon Bentley
- Working Effectively with Legacy Code by Michael C. Feathers
- Peopleware by Demarco and Lister
- Coders at Work by Peter Seibel
- Surely You're Joking, Mr. Feynman!
- Effective Java 2nd edition
- Patterns of Enterprise Application Architecture by Martin Fowler
- The Little Schemer
- The Seasoned Schemer
- Why's (Poignant) Guide to Ruby
- The Inmates Are Running The Asylum: Why High Tech Products Drive Us Crazy and How to Restore the Sanity
- The Art of Unix Programming
- Test-Driven Development: By Example by Kent Beck
- Practices of an Agile Developer
- Don't Make Me Think
- Agile Software Development, Principles, Patterns, and Practices by Robert C. Martin
- Domain Driven Designs by Eric Evans
- The Design of Everyday Things by Donald Norman
- Modern C++ Design by Andrei Alexandrescu
- Best Software Writing I by Joel Spolsky
- The Practice of Programming by Kernighan and Pike
- Pragmatic Thinking and Learning: Refactor Your Wetware by Andy Hunt
- Software Estimation: Demystifying the Black Art by Steve McConnel
- The Passionate Programmer (My Job Went To India) by Chad Fowler
- Hackers: Heroes of the Computer Revolution
- Algorithms + Data Structures = Programs
- Writing Solid Code
- JavaScript - The Good Parts
- Getting Real by 37 Signals
- Foundations of Programming by Karl Seguin
- Computer Graphics: Principles and Practice in C (2nd Edition)
- Thinking in Java by Bruce Eckel
- The Elements of Computing Systems
- Refactoring to Patterns by Joshua Kerievsky
- Modern Operating Systems by Andrew S. Tanenbaum
- The Annotated Turing
- Things That Make Us Smart by Donald Norman
- The Timeless Way of Building by Christopher Alexander
- The Deadline: A Novel About Project Management by Tom DeMarco
- The C++ Programming Language (3rd edition) by Stroustrup
- Patterns of Enterprise Application Architecture
- Computer Systems - A Programmer's Perspective
- Agile Principles, Patterns, and Practices in C# by Robert C. Martin
- Growing Object-Oriented Software, Guided by Tests
- Framework Design Guidelines by Brad Abrams
- Object Thinking by Dr. David West
- Advanced Programming in the UNIX Environment by W. Richard Stevens
- Hackers and Painters: Big Ideas from the Computer Age
- The Soul of a New Machine by Tracy Kidder
- CLR via C# by Jeffrey Richter
- The Timeless Way of Building by Christopher Alexander
- Design Patterns in C# by Steve Metsker
- Alice in Wonderland by Lewis Carol
- Zen and the Art of Motorcycle Maintenance by Robert M. Pirsig
- About Face - The Essentials of Interaction Design
- Here Comes Everybody: The Power of Organizing Without Organizations by Clay Shirky
- The Tao of Programming
- Computational Beauty of Nature
- Writing Solid Code by Steve Maguire
- Philip and Alex's Guide to Web Publishing
- Object-Oriented Analysis and Design with Applications by Grady Booch
- Effective Java by Joshua Bloch
- Computability by N. J. Cutland
- Masterminds of Programming
- The Tao Te Ching
- The Productive Programmer
- The Art of Deception by Kevin Mitnick
- The Career Programmer: Guerilla Tactics for an Imperfect World by Christopher Duncan
- Paradigms of Artificial Intelligence Programming: Case studies in Common Lisp
- Masters of Doom
- Pragmatic Unit Testing in C# with NUnit by Andy Hunt and Dave Thomas with Matt Hargett
- How To Solve It by George Polya
- The Alchemist by Paulo Coelho
- Smalltalk-80: The Language and its Implementation
- Writing Secure Code (2nd Edition) by Michael Howard
- Introduction to Functional Programming by Philip Wadler and Richard Bird
- No Bugs! by David Thielen
- Rework by Jason Freid and DHH
- JUnit in Action
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DataIsBeautiful DataIsBeautiful is for visualizations that effectively convey information. Aesthetics are an important part of information visualization, but pretty pictures are not the sole aim of this subreddit.
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Health Health, a science-based community to discuss health news and the coronavirus (COVID-19) pandemic
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Today I Learned (TIL) You learn something new every day; what did you learn today? Submit interesting and specific facts about something that you just found out here.
- TIL: 'The Voice' actor in Field of Dreams (who says "If you build it, he will come") has never been revealedby /u/DearBurt on November 28, 2023 at 4:17 pm
submitted by /u/DearBurt [link] [comments]
- TIL that domestic cats kill 1.3 - 4.0 billion birds and 6.3 - 22.3 billion mammals annually in the United States.by /u/AnalogNightsFM on November 28, 2023 at 3:53 pm
submitted by /u/AnalogNightsFM [link] [comments]
- TIL about vanity height: very tall buildings often include a substantial amount of unusable space purely to make the building taller. For example, 29% of the Burj Khalifa's 829 meter height (224m) is vanity - it is still the tallest building by top floor height, but only by two meters.by /u/1668553684 on November 28, 2023 at 3:43 pm
submitted by /u/1668553684 [link] [comments]
- TIL in the 1950s, when the CIA was fighting the Huks, a communist guerrilla movement in the Philippines, they spread rumors that evil men would be attacked by an aswang or 'vampire'. As part of psychological warfare, they punctured holes in a dead body and drained it of blood for others to find.by /u/trifletruffles on November 28, 2023 at 3:33 pm
submitted by /u/trifletruffles [link] [comments]
- TIL that the smallest fish in the world, the Tiny Goby, rarely grows longer than half an inch. Despite this, they are so abundant that they can support an entire fisheryby /u/jamjam1090 on November 28, 2023 at 2:55 pm
submitted by /u/jamjam1090 [link] [comments]
- TIL that the story of Popeye eating spinach due to a misplaced decimal point over reporting its iron content is a myth. The correct iron value was already well known and nowhere did Popeye mention eating spinach because of its iron content.by /u/John-Piece on November 28, 2023 at 2:05 pm
submitted by /u/John-Piece [link] [comments]
- TIL that Julia Child's first foray into cooking was mixing shark repellants in a bathtub while working at the OSS Emergency Sea Rescue Equipment Section during WWIIby /u/JMac741 on November 28, 2023 at 1:28 pm
submitted by /u/JMac741 [link] [comments]
- TIL that the United States does not have a federal law banning cannibalism. Idaho is the only state where simply committing the act lands you in prison.by /u/iiSkilledProgram on November 28, 2023 at 8:10 am
submitted by /u/iiSkilledProgram [link] [comments]
- TIL during Young Thugs 2022 RICO trial, a juror had to write a 30 page essay on the importance of jury duty as punishment for visiting the DR instead of showing upby /u/MrJigglyBrown on November 28, 2023 at 4:29 am
submitted by /u/MrJigglyBrown [link] [comments]
- TIL JFK's father Joseph Kennedy made much of his fortune through insider trading. FDR later made him chairman of the Securities and Exchange Commission. When asked why he appointed a crook, FDR replied, "set a thief to catch a thief." Kennedy proceeded to outlaw the practices that made him rich.by /u/Natural-Sort on November 28, 2023 at 2:47 am
submitted by /u/Natural-Sort [link] [comments]
- TIL an occupied house in Kansas contained over 2,000 brown recluse spiders. Amazingly, the residents were never bitten by themby /u/AlbinoAlex on November 28, 2023 at 1:21 am
submitted by /u/AlbinoAlex [link] [comments]
- TIL when deciding what to name the town during a meeting, the residents got so frustrated with everyone saying "why not this" and "why not that," they just named the town, "Whynot," North Carolina, so they could all go home.by /u/WolfmansGotNards2 on November 28, 2023 at 1:12 am
submitted by /u/WolfmansGotNards2 [link] [comments]
- TIL That prisoners in Japan who are sentenced to death only find out on the morning of their execution. The prisoner's family and legal representatives, and also the general public, are informed only after the execution has taken place.by /u/fuzzsaw92 on November 28, 2023 at 1:02 am
submitted by /u/fuzzsaw92 [link] [comments]
- TIL in 2009, three masked burglars broke into Dolph Lundgren's home, tied up and threatened his wife, but fled after finding a family photo and realizing whose home they'd broken intoby /u/RaeBee on November 28, 2023 at 12:24 am
submitted by /u/RaeBee [link] [comments]
- TIL the Woodstock 1999 festival was so ill-prepared for the crowd size that portable toilets overflowed and there was no shade from the heat. Attendees started playing in mud to cool off unaware it was contaminated by waste leaking from toilets leading to many cases of trench mouth and trench foot.by /u/f_GOD on November 28, 2023 at 12:11 am
submitted by /u/f_GOD [link] [comments]
- TIL that some members of the Sama-Banjau ethnic group intentionally rupture their ear drums at a young age in order to improve their ability to dive & hunt at sea. This allows them to dive for extended periods of time between varying depths without worrying about pain from water pressure changesby /u/dakp15 on November 27, 2023 at 10:32 pm
submitted by /u/dakp15 [link] [comments]
- TIL that DuPont, who makes Teflon products like non-stick cookware, had been dumping toxic waste chemicals from Teflon production in the waters of Parkersburg, West Virginia for decades.by /u/RollingNightSky on November 27, 2023 at 9:41 pm
submitted by /u/RollingNightSky [link] [comments]
- TIL that Sigmund Rascher, a scientist who performed inhumane medical experiments at Dachau, was himself imprisoned and executed by the Nazis at Dachau after it was revealed that he and his wife were committing fraud by kidnapping (German) babies.by /u/RexSueciae on November 27, 2023 at 8:48 pm
submitted by /u/RexSueciae [link] [comments]
- TIL bleach has a shelf life with the effectiveness decreasing after just 6 months and eventually degrades into salt waterby /u/BellarmineFan on November 27, 2023 at 7:31 pm
submitted by /u/BellarmineFan [link] [comments]
- TIL about Mexican woman Miriam Rodriguez who tracked the killers of her 14-year-old daughter Karen after she was abducted in 2012. She disguised herself to get their names & addresses & made excuses to meet their families. She was shot 12 times outside her house 10 May 2017, Mother’s Day in Mexico.by /u/Beautiful_Bowl_9802 on November 27, 2023 at 7:23 pm
submitted by /u/Beautiful_Bowl_9802 [link] [comments]