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Chapter 2. Setting Up Cygwin Table of Contents Internet Setup Download Source Selecting an Install Directory Local Package Directory Connection Method Choosing Mirrors Choosing Packages Download and Installation Progress Icons Post-Install Scripts Troubleshooting Environment Variables Changing Cygwin's Maximum Memory NT security and usage of ntsec NT security Process privileges File permissions NT SIDs in Cygwin The mapping leak The ACL API New setuid concept Switching User Context Special values of user and group ids Customizing bash

Cygwin Documentation * Cygwin User's Guide * Cygwin API Reference * Frequently Asked Questions (FAQ) file for Cygwin. Some work remains to be done in documenting the Cygwin API. In addition to the Cygwin API Reference and information in the FAQ, you may want to check source code file winsup/cygwin.din which lists all of the Cygwin DLL exports. We have some preliminary docs on how to profile the Cygwin DLL. Information on building and using DLLs is here. Also note that there is quite a lot of useful information in the project mailing list archives.

Cygwin User's Guide The Cygwin User's Guide is now available in several formats: * Several HTML files, with Table of Contents * One large compressed HTML file * One compressed PDF file Alternatively, you may jump to a section that interests you: * Quick Start Guide for those more experienced with Windows * Quick Start Guide for those more experienced with UNIX * Help with setting up Cygwin with setup.exe

What Is Cygwin? # Cygwin is a Linux-like environment for Windows. It consists of two parts: A DLL (cygwin1.dll) which acts as a Linux API emulation layer providing substantial Linux API functionality. # A collection of tools which provide Linux look and feel. The Cygwin DLL currently works with all recent, commercially released x86 32 bit and 64 bit versions of Windows, with the exception of Windows CE. Note that the official support for Windows 95, Windows 98, and Windows Me will be discontinued with the next major version (1.7.0) of Cygwin. What Isn't Cygwin? # Cygwin is not a way to run native linux apps on Windows. You have to rebuild your application from source if you want it to run on Windows. # Cygwin is not a way to magically make native Windows apps aware of UNIX ® functionality, like signals, ptys, etc. Again, you need to build your apps from source if you want to take advantage of Cygwin functionality.

Requirements * Windows XP/2000 (recommended) * Windows Vista (may work, please report) * Windows 98/ME (most features may work) * Linux with WINE (some users have reported that most features can work) * SSE instruction set is required for some target formats * Dual-core processors have optimized performance