Concept

DragonFly BSD

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FreeBSD Ports

The FreeBSD Ports collection is a package management system for the FreeBSD operating system. As of February 2020, there are over 38,487 ports available in the collection. It has also been adopted by NetBSD as the basis of its pkgsrc system. The ports collection uses s arranged in a directory hierarchy so that software can be built, installed and uninstalled with the make command. When installing an application, very little (if any) user intervention is required after issuing a beginning command such as make install or make install clean in the ports directory of the desired application.

LibreSSL

LibreSSL is an open-source implementation of the Transport Layer Security (TLS) protocol. The implementation is named after Secure Sockets Layer (SSL), the deprecated predecessor of TLS, for which support was removed in release 2.3.0. The OpenBSD project forked LibreSSL from OpenSSL 1.0.1g in April 2014 as a response to the Heartbleed security vulnerability, with the goals of modernizing the codebase, improving security, and applying development best practices.

Comparison of open-source operating systems

These tables compare free software / open-source operating systems. Where not all of the versions support a feature, the first version which supports it is listed.

Buffer overflow protection

Buffer overflow protection is any of various techniques used during software development to enhance the security of executable programs by detecting buffer overflows on stack-allocated variables, and preventing them from causing program misbehavior or from becoming serious security vulnerabilities. A stack buffer overflow occurs when a program writes to a memory address on the program's call stack outside of the intended data structure, which is usually a fixed-length buffer.

Bhyve

bhyve (pronounced "bee hive", formerly written as BHyVe for "BSD hypervisor") is a type-2 hypervisor initially written for FreeBSD. It can also be used on a number of illumos based distributions including SmartOS, OpenIndiana, and OmniOS. A port of bhyve to macOS called xhyve is also available. bhyve supports the virtualization of several guest operating systems, including FreeBSD 9+, OpenBSD, NetBSD, Linux, illumos, DragonFly and Windows NT (Windows Vista and later, Windows Server 2008 and later).

Ioctl

In computing, ioctl (an abbreviation of input/output control) is a system call for device-specific input/output operations and other operations which cannot be expressed by regular system calls. It takes a parameter specifying a request code; the effect of a call depends completely on the request code. Request codes are often device-specific. For instance, a CD-ROM device driver which can instruct a physical device to eject a disc would provide an ioctl request code to do so.