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UNIX for Dummies Questions & Answers
MAX OS X and GCC Compiler - From the Apple Store!
Post 3004 by Neo on Friday 15th of June 2001 01:11:11 PM
06-15-2001
Administrator
More From Apple and MAC OS X.
I had the good luck of asking these questions with the 'Genius Bar' here at the Apple Store in Tysons. Here is the scoop on "openness":<P>
The core kernel for MAC OS X is Darwin and YES, it is opensource. It is extensible, expandable, scaleable. It is as much UNIX as any UNIX. In an nutshell, Apple has evolved to a UNIX core. The difference lies, primarily in the graphics and user interfaces.<P>
Command line Darwin is just like command line in any UNIX. You can rebuild the kernel, add revise drivers, etc. However, there are licensing issues with what you do for these in a commerical environment. For fun and for your company or for yourself, you can modify the kernel to your hearts content.<P>
The graphical user interface is Apple controlled (proprietary). In a traditional UNIX environment, think of this as replacing X (and X Windows, etc.) with the Apple graphics environment. This is what you pay, super programs like the MAC user interface (on top of the UNIX core Darwin), iMovies, Click-Time, etc. all on top of a multi-tasking, memory management, etc. UNIX core. <P>
In a nutshell, MAC OS X is the marriage of UNIX (the core open system) with Apple graphics (it is more complex than that, but that is the bird's eye view). If you love to run UNIX-based software, you can and you can do this side by side Apple graphics and applications. <P>
So, the core UNIX (Darwin) kernel is open and extensible. The MAC graphics and super desktop applications are not. This is a great marriage; UNIX at the core and Apple at the graphics, application level. That is it, in a nutshell.
I'm more excited every time I play on OS X. I now plan to buy an OS X system and replace my Windows desktop completely with UNIX and Apple, running Microsoft applications like Word and Powerpoint in the Apple environment. This is promising and a giant leap for UNIX, IMHO.<P>
However, not sure about security, user management, logins, etc. The systems here boot without a login prompt. Will have to check into how OS X works in a multi-user environment. Still learning ......
The core kernel for MAC OS X is Darwin and YES, it is opensource. It is extensible, expandable, scaleable. It is as much UNIX as any UNIX. In an nutshell, Apple has evolved to a UNIX core. The difference lies, primarily in the graphics and user interfaces.<P>
Command line Darwin is just like command line in any UNIX. You can rebuild the kernel, add revise drivers, etc. However, there are licensing issues with what you do for these in a commerical environment. For fun and for your company or for yourself, you can modify the kernel to your hearts content.<P>
The graphical user interface is Apple controlled (proprietary). In a traditional UNIX environment, think of this as replacing X (and X Windows, etc.) with the Apple graphics environment. This is what you pay, super programs like the MAC user interface (on top of the UNIX core Darwin), iMovies, Click-Time, etc. all on top of a multi-tasking, memory management, etc. UNIX core. <P>
In a nutshell, MAC OS X is the marriage of UNIX (the core open system) with Apple graphics (it is more complex than that, but that is the bird's eye view). If you love to run UNIX-based software, you can and you can do this side by side Apple graphics and applications. <P>
So, the core UNIX (Darwin) kernel is open and extensible. The MAC graphics and super desktop applications are not. This is a great marriage; UNIX at the core and Apple at the graphics, application level. That is it, in a nutshell.
I'm more excited every time I play on OS X. I now plan to buy an OS X system and replace my Windows desktop completely with UNIX and Apple, running Microsoft applications like Word and Powerpoint in the Apple environment. This is promising and a giant leap for UNIX, IMHO.<P>However, not sure about security, user management, logins, etc.
The systems here boot without a login prompt. Will have to check into how OS X works in a multi-user environment. Still learning ......|
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LEARN ABOUT OSX
core
CORE(5) BSD File Formats Manual CORE(5) NAME
core -- memory image file format SYNOPSIS
#include <sys/param.h> DESCRIPTION
A small number of signals which cause abnormal termination of a process also cause a record of the process's in-core state to be written to disk for later examination by one of the available debuggers. (See sigaction(2).) This memory image is written to a file named by default core.pid, where pid is the process ID of the process, in the /cores directory, provided the terminated process had write permission in the directory, and the directory existed. The maximum size of a core file is limited by setrlimit(2). Files which would be larger than the limit are not created. The core file consists of the Mach-O(5) header as described in the <mach-o/loader.h> file. The remainder of the core file consists of vari- ous sections described in the Mach-O(5) header. NOTE
Core dumps are disabled by default under Darwin/Mac OS X. To re-enable core dumps, a privileged user must do one of the following * Edit /etc/launchd.conf or $HOME/.launchd.conf and add a line specifying the limit limit core unlimited * A privileged user can also enable cores with launchctl limit core unlimited * A privileged user can also enable core files by using ulimit(1) or limit(1) depending upon the shell. SEE ALSO
gdb(1), setrlimit(2), sigaction(2), Mach-O(5), launchd.conf(5), launchd.plist(5), sysctl(8) HISTORY
A core file format appeared in Version 6 AT&T UNIX. BSD
June 26, 2008 BSD