Are the BSDs dying? Post: 303012227

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The Lounge What is on Your Mind? Are the BSDs dying? Post 303012227 by Neo on Wednesday 31st of January 2018 11:15:49 PM

02-01-2018

Administrator

There is nothing "dead" about BSD. BSD lives in the heart and soul of MacOS, and MacOS is a very popular computer operating system. All software changes over time, and BSD is no exception and BSD changed the heart of the MacOS forever:

Reference:

BSD Overview

Quote:

BSD Overview

The BSD portion of the OS X kernel is derived primarily from FreeBSD, a version of 4.4BSD that offers advanced networking, performance, security, and compatibility features. BSD variants in general are derived (sometimes indirectly) from 4.4BSD-Lite Release 2 from the Computer Systems Research Group (CSRG) at the University of California at Berkeley. BSD provides many advanced features, including the following:

Preemptive multitasking with dynamic priority adjustment. Smooth and fair sharing of the computer between applications and users is ensured, even under the heaviest of loads.

Multiuser access. Many people can use an OS X system simultaneously for a variety of things. This means, for example, that system peripherals such as printers and disk drives are properly shared between all users on the system or the network and that individual resource limits can be placed on users or groups of users, protecting critical system resources from overuse.

Strong TCP/IP networking with support for industry standards such as SLIP, PPP, and NFS. OS X can interoperate easily with other systems as well as act as an enterprise server, providing vital functions such as NFS (remote file access) and email services, or Internet services such as HTTP, FTP, routing, and firewall (security) services.
Memory protection. Applications cannot interfere with each other. One application crashing does not affect others in any way.

Virtual memory and dynamic memory allocation. Applications with large appetites for memory are satisfied while still maintaining interactive response to users. With the virtual memory system in OS X, each application has access to its own 4 GB memory address space; this should satisfy even the most memory-hungry applications.
Support for kernel threads based on Mach threads. User-level threading packages are implemented on top of kernel threads. Each kernel thread is an independently scheduled entity. When a thread from a user process blocks in a system call, other threads from the same process can continue to execute on that or other processors. By default, a process in the conventional sense has one thread, the main thread. A user process can use the POSIX thread API to create other user threads.

SMP support. Support is included for computers with multiple CPUs.

Source code. Developers gain the greatest degree of control over the BSD programming environment because source is included.

Many of the POSIX APIs.

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LEARN ABOUT MOJAVE

protocols

PROTOCOLS(5)						      BSD File Formats Manual						      PROTOCOLS(5)

NAME

     protocols -- protocol name data base

DESCRIPTION

     The protocols file contains information regarding the known protocols used in the DARPA Internet.	For each protocol a single line should be
     present with the following information:

	   official protocol name
	   protocol number
	   aliases

     Items are separated by any number of blanks and/or tab characters.  A ``#'' indicates the beginning of a comment; characters up to the end of
     the line are not interpreted by routines which search the file.

     Protocol names may contain any printable character other than a field delimiter, newline, or comment character.

INTERACTION WITH DIRECTORY SERVICES

     Processes generally find protocol records using one of the getprotoent(3) family of functions.  On Mac OS X, these functions interact with
     the DirectoryService(8) daemon, which reads the /etc/protocols file as well as searching other directory information services to determine
     protocol name and number information.

FILES

     /etc/protocols

SEE ALSO

     getprotoent(3), DirectoryService(8)

HISTORY

     The protocols file format appeared in 4.2BSD.

4.2 Berkeley Distribution					   June 5, 1993 					 4.2 Berkeley Distribution