Mac Console.app Source Code

Accessing the Console app is as easy as opening it from the Applications Utilities folder. Alternatively, you could use your Command+Space shortcut to call up Spotlight and begin typing ‘Console' to access it. However you call it up, the Console will open to a bewildering list of messages.

A kernel panic message from a Linux system
Kernel panic in Ubuntu 13.04 (Linux 3.8) in Oracle VM VirtualBox

A kernel panic (sometimes abbreviated as KP[1]) is a safety measure taken by an operating system's kernel upon detecting an internal fatal error in which it either is unable to safely recover or cannot have the system continue to run without having a much higher risk of major data loss. The term is largely specific to Unix and Unix-like systems. For Microsoft Windows operating systems the equivalent term is 'Stop error', resulting in a bug check[2] screen that presents the bug check code on a blue background in early versions of Windows (colloquially known as a 'Blue Screen of Death' or BSoD), or on a green background on the Xbox One platform as well as in Windows 10 preview builds[3].

The kernel routines that handle panics, known as panic() in AT&T-derived and BSD Unix source code, are generally designed to output an error message to the console, dump an image of kernel memory to disk for post-mortem debugging, and then either wait for the system to be manually rebooted, or initiate an automatic reboot.[4] The information provided is of a highly technical nature and aims to assist a system administrator or software developer in diagnosing the problem. Kernel panics can also be caused by errors originating outside kernel space. For example, many Unix operating systems panic if the init process, which runs in user space, terminates.[5][6]

History[edit]

The Unix kernel maintains internal consistency and runtime correctness with assertions as the fault detection mechanism. The basic assumption is that the hardware and the software should perform correctly and a failure of an assertion results in a panic, i.e. a voluntary halt to all system activity.[7] The kernel panic was introduced in an early version of Unix and demonstrated a major difference between the design philosophies of Unix and its predecessor Multics. Multics developer Tom van Vleck recalls a discussion of this change with Unix developer Dennis Ritchie:

I remarked to Dennis that easily half the code I was writing in Multics was error recovery code. He said, 'We left all that stuff out. If there's an error, we have this routine called panic, and when it is called, the machine crashes, and you holler down the hall, 'Hey, reboot it.'[8]

The original panic() function was essentially unchanged from Fifth Edition UNIX to the VAX-based UNIX 32V and output only an error message with no other information, then dropped the system into an endless idle loop.

Source code of panic() function in V6 UNIX:[9]

As the Unix codebase was enhanced, the panic() function was also enhanced to dump various forms of debugging information to the console.

Causes[edit]

A panic may occur as a result of a hardware failure or a software bug in the operating system. In many cases, the operating system is capable of continued operation after an error has occurred. However, the system is in an unstable state and rather than risking security breaches and data corruption, the operating system stops to prevent further damage and facilitate diagnosis of the error and, in usual cases, restart.[10]

After recompiling a kernel binary image from source code, a kernel panic while booting the resulting kernel is a common problem if the kernel was not correctly configured, compiled or installed.[11] Add-on hardware or malfunctioning RAM could also be sources of fatal kernel errors during start up, due to incompatibility with the OS or a missing device driver.[12] A kernel may also go into panic() if it is unable to locate a root file system.[13] During the final stages of kernel userspace initialization, a panic is typically triggered if the spawning of init fails. A panic might also be triggered if the init process terminates, as the system would then be unusable.[14]

The following is an implementation of the Linux kernel final initialization in kernel_init():[15]

Operating system specifics[edit]

Linux[edit]

Kernel panic as seen on an iKVM console

Kernel panics appear in Linux like in other Unix-like systems, but they can also generate another kind of error condition, known as a kernel oops.[16] In this case, the kernel normally continues to run after killing the offending process. As an oops could cause some subsystems or resources to become unavailable, they can later lead to a full kernel panic.

On Linux, a kernel panic causes keyboard LEDs to blink as a visual indication of a critical condition.[17]

macOS[edit]

When a kernel panic occurs in Mac OS X 10.2 through 10.7, the computer displays a multilingual message informing the user that they need to reboot the system.[18] Prior to 10.2, a more traditional Unix-style panic message was displayed; in 10.8 and later, the computer automatically reboots and displays a message after the restart. The format of the message varies from version to version:[19]

  • 10.0–10.1: The system displays text on the screen, giving details about the error, and becomes unresponsive.
  • 10.2: Rolls down a black transparent curtain then displays a message on a white background informing the user that they should restart the computer. The message is shown in English, French, German and Japanese.
  • 10.3–10.5: The kernel panic is almost the same as version 10.2 but the background of the error screen is black.
  • 10.6–10.7: The text has been revised and now includes a Spanish translation.
  • 10.8 and later: The computer becomes unresponsive before it immediately reboots. When the computer starts back up, it shows a warning message for a few seconds about the computer restarting because of a kernel panic, and then the computer restarts back up. The message now includes a Chinese translation.

Sometimes when there are five or more kernel panics within three minutes of the first one, the Mac will display a prohibitory sign for 30 seconds, and then shut down (this is known as a 'recurring kernel panic').

In all versions above 10.2, the text is superimposed on a standby symbol and is not full screen. Debugging information is saved in NVRAM and written to a log file on reboot. In 10.7 there is a feature to automatically restart after a kernel panic. In some cases, on 10.2 and later, white text detailing the error may appear in addition to the standby symbol.

  • Mac OS X 10.0–10.1 kernel panic

  • Mac OS X 10.2 kernel panic

  • Mac OS X 10.3–10.5 kernel panic

  • Mac OS X 10.6 and 10.7 kernel panic

  • Message shown after the computer restarts because of a kernel panic in OS X 10.8 and later versions

See also[edit]

Valve Source Code

Wikimedia Commons has media related to Kernel panic.

References[edit]

Mac Console.app Source Code
  1. ^'KP - Kernel Panic (Linux) | AcronymFinder'. www.acronymfinder.com. Retrieved January 6, 2016.
  2. ^'Bug Checks (Blue Screens)'. Hardware Dev Center - Microsoft.
  3. ^Hoffman, Chris. 'Did You Know Windows 10 Has a Green Screen of Death?'. How-To Geek. Retrieved June 4, 2020.
  4. ^'FreeBSD 11.0 - man page for panic (freebsd section 9) - Unix & Linux Commands'. www.unix.com.
  5. ^'boot failure-init died - Unix Linux Forums - HP-UX'. www.unix.com.
  6. ^Randolph J. Herber (September 1, 1999). 'Re: PANIC: init died'. Newsgroup: comp.sys.sgi.admin.
  7. ^Daniel P. Siewiorek; Robert S. Swarz (1998). Reliable computer systems: design and evaluation. A K Peters, Ltd. p. 622. ISBN978-1-56881-092-8. Retrieved May 6, 2011.
  8. ^'Unix and Multics'. www.multicians.org.
  9. ^
  10. ^Steven M. Hancock (November 22, 2002). Tru64 UNIX troubleshooting: diagnosing and correcting system problemsHP Technologies SeriesITPro collection. Digital Press. pp. 119–126. ISBN978-1-55558-274-6. Retrieved May 3, 2011.
  11. ^Michael Jang (2006). Linux annoyances for geeks. O'Reilly Media, Inc. pp. 267–274. ISBN978-0-596-00801-7. Retrieved April 29, 2011.
  12. ^David Pogue (December 17, 2009). Switching to the Mac: The Missing Manual, Snow Leopard Edition. O'Reilly Media, Inc. p. 589. ISBN978-0-596-80425-1. Retrieved May 4, 2011.
  13. ^Greg Kroah-Hartman (2007). Linux kernel in a nutshell. O'Reilly Media, Inc. p. 59. ISBN978-0-596-10079-7. Retrieved May 3, 2011.
  14. ^Wolfgang Mauerer (September 26, 2008). Professional Linux Kernel Architecture. John Wiley and Sons. pp. 1238–1239. ISBN978-0-470-34343-2. Retrieved May 3, 2011.
  15. ^linux/init/main.c, LXR Cross Referencer
  16. ^'Linux Device Drivers, Chapter 4'(PDF).
  17. ^James Kirkland; David Carmichael; Christopher L. Tinker; Gregory L. Tinker (May 2006). Linux Troubleshooting for System Administrators and Power Users. Prentice Hall. p. 62. ISBN9780132797399. Retrieved February 5, 2016.
  18. ^'OS X: About kernel panics - Apple Support'. support.apple.com.
  19. ^'A New Screen of Death for Mac OS X'. OSXBook.com.
Retrieved from 'https://en.wikipedia.org/w/index.php?title=Kernel_panic&oldid=960750523'

With an all-new design that looks great on macOS Big Sur, Xcode 12 has customizable font sizes for the navigator, streamlined code completion, and new document tabs. Xcode 12 builds Universal apps by default to support Mac with Apple Silicon, often without changing a single line of code.

Designed for macOS Big Sur.

Xcode 12 looks great on macOS Big Sur, with a navigator sidebar that goes to the top of the window and clear new toolbar buttons. The navigator defaults to a larger font that’s easier to read, while giving you multiple size choices. New document tabs make it easy to create a working set of files within your workspace.

Document tabs.

The new tab model lets you open a new tab with a double-click, or track the selected file as you click around the navigator. You can re-arrange the document tabs to create a working set of files for your current task, and configure how content is shown within each tab. The navigator tracks the open files within your tabs using strong selection.

Navigator font sizes.

The navigator now tracks the system setting for “Sidebar icon size” used in Finder and Mail. You can also choose a unique font size just for Xcode within Preferences, including the traditional dense information presentation, and up to large fonts and icon targets.

C# Console App

Code completion streamlined.

A new completion UI presents only the information you need, taking up less screen space as you type. And completions are presented much faster, so you can keep coding at maximum speed.

Redesigned organizer.

An all-new design groups all critical information about each of your apps together in one place. Choose any app from any of your teams, then quickly navigate to inspect crash logs, energy reports, and performance metrics, such as battery consumption and launch time of your apps when used by customers.

SwiftUI

SwiftUI offers new features, improved performance, and the power to do even more, all while maintaining a stable API that makes it easy to bring your existing SwiftUI code forward into Xcode 12. A brand new life cycle management API for apps built with SwiftUI lets you write your entire app in SwiftUI and share even more code across all Apple platforms. And a new widget platform built on SwiftUI lets you build widgets that work great on iPad, iPhone, and Mac. Your SwiftUI views can now be shared with other developers, and appear as first-class controls in the Xcode library. And your existing SwiftUI code continues to work, while providing faster performance, better diagnostics, and access to new controls.

Universal app ready.

Xcode 12 is built as a Universal app that runs 100% natively on Intel-based CPUs and Apple Silicon for great performance and a snappy interface.* It also includes a unified macOS SDK that includes all the frameworks, compilers, debuggers, and other tools you need to build apps that run natively on Apple Silicon and the Intel x86_64 CPU.

Updated automatically

When you open your project in Xcode 12, your app is automatically updated to produce release builds and archives as Universal apps. When you build your app, Xcode produces one binary “slice” for Apple Silicon and one for the Intel x86_64 CPU, then wraps them together as a single app bundle to share or submit to the Mac App Store. You can test this at any time by selecting “Any Mac” as the target in the toolbar.

Test multiple architectures.

On the new Mac with Apple Silicon, you can run and debug apps running on either the native architecture or on Intel virtualization by selecting “My Mac (Rosetta)” in the toolbar.

Multiplatform template

Mac Console.app Source Code List

New multiplatform app templates set up new projects to easily share code among iOS, iPadOS, and macOS using SwiftUI and the new lifecycle APIs. The project structure encourages sharing code across all platforms, while creating special custom experiences for each platform where it makes sense for your app.

Source Code Full Movie

Improved auto-indentation

Swift code is auto-formatted as you type to make common Swift code patterns look much better, including special support for the “guard” command.

Apple Console App

StoreKit testing

View Source Code On Mac

New tools in Xcode let you create StoreKit files that describe the various subscription and in-app purchase products your app can offer, and create test scenarios to make sure everything works great for your customers — all locally testable on your Mac.

Get started with the beta.

Source Code Film

Download Xcode 12 beta and use these resources to build apps for all Apple platforms.

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