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fix select link

Joey Aiello 2017-08-07 13:45:15 -07:00
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About-Win32-OpenSSH-and-Design-Details.md

@ -3,7 +3,7 @@ Intro
[OpenSSH](https://en.wikipedia.org/wiki/OpenSSH), part of OpenBSD operating system, is a bunch of utility programs based on [SSH](https://en.wikipedia.org/wiki/Secure_Shell) protocol. These include server and client executables as well as utilities to create and manage cryptographic keys. [Portable OpenSSH](http://www.openssh.com/portable.html) is derived from the OpenBSD project and ported to support a wide variety of Unix flavors. The goal of this project is to extend support to Windows family of operating systems and be able to do this in a common repository without needing a Windows specific fork.
Relevant design details in the context of this project -
OpenSSH and the portable version are single threaded applications, interacting with IO using POSIX based [File Descriptors](https://en.wikipedia.org/wiki/File_descriptor) and multiplexing IO operations using [select] (https://en.wikipedia.org/wiki/Select_%28Unix%29) calls. Session isolation and [privilege separation](http://www.citi.umich.edu/u/provos/ssh/privsep.html) are implemented using the standard UNIX routines - [fork](https://en.wikipedia.org/wiki/Fork_(system_call)), [setuid](https://en.wikipedia.org/wiki/Setuid), [chroot](https://en.wikipedia.org/wiki/Chroot). IPC is carried over [UNIX domain sockets](https://en.wikipedia.org/wiki/Unix_domain_socket).
OpenSSH and the portable version are single threaded applications, interacting with IO using POSIX based [File Descriptors](https://en.wikipedia.org/wiki/File_descriptor) and multiplexing IO operations using [select](https://en.wikipedia.org/wiki/Select_%28Unix%29) calls. Session isolation and [privilege separation](http://www.citi.umich.edu/u/provos/ssh/privsep.html) are implemented using the standard UNIX routines - [fork](https://en.wikipedia.org/wiki/Fork_(system_call)), [setuid](https://en.wikipedia.org/wiki/Setuid), [chroot](https://en.wikipedia.org/wiki/Chroot). IPC is carried over [UNIX domain sockets](https://en.wikipedia.org/wiki/Unix_domain_socket).
Goals