8142972d87
effect is to move away from DocBook SGML and DJ Delorie's doctool and toward pure DocBook XSL. (There remains just one use of doctool, and we have plans for replacing it, too.) See ChangeLog for details.
1254 lines
53 KiB
XML
1254 lines
53 KiB
XML
<?xml version="1.0" encoding='UTF-8'?>
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<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
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<qandadiv id="faq.using">
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<title>Using Cygwin</title>
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|
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<!-- faq-problems.xml -->
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<qandaentry id="faq.using.missing-dlls">
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<question><para>Why can't my application locate cygncurses-8.dll? or cygintl-3.dll? or cygreadline6.dll? or ...?</para></question>
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<answer>
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<para>Well, something has gone wrong somehow...
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</para>
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<para>To repair the damage, you must run Cygwin Setup again, and re-install the
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package which provides the missing DLL package.
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</para>
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<para>If you already installed the package at one point, Cygwin Setup won't
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show the option to install the package by default. In the
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``Select packages to install'' dialog, click on the <literal>Full/Part</literal>
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button. This lists all packages, even those that are already
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installed. Scroll down to locate the missing package, for instance
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<literal>libncurses8</literal>. Click on the ``cycle'' glyph until it says
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``Reinstall''. Continue with the installation.
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</para>
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<para>For a detailed explanation of the general problem, and how to extend
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it to other missing DLLs and identify their containing packages, see
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<ulink url="http://cygwin.com/ml/cygwin/2002-01/msg01619.html">http://cygwin.com/ml/cygwin/2002-01/msg01619.html</ulink>.
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</para>
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</answer></qandaentry>
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<qandaentry id="faq.using.slow">
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<question><para>Why is Cygwin suddenly <emphasis>so</emphasis> slow?</para></question>
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<answer>
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<para>If suddenly <emphasis>every</emphasis> command takes a
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<emphasis>very</emphasis> long time, then something is probably attempting to
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access a network share. You may have the obsolete <literal>//c</literal>
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notation in your PATH or startup files. Using <literal>//c</literal> means
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to contact the <emphasis>network server</emphasis> <literal>c</literal>, which
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will slow things down tremendously if it does not exist.
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</para>
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</answer></qandaentry>
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<qandaentry id="faq.using.shares">
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<question><para>Why can't my services access network shares?</para></question>
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<answer>
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<para>If your service is one of those which switch the user context
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(sshd, inetd, etc), then it depends on the method used to switch to
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another user. This problem as well as its solution is described in
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detail in the Cygwin User's Guide, see
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<ulink url="http://cygwin.com/cygwin-ug-net/ntsec.html" />.
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</para>
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<para>Workarounds include using public network share that does not require
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authentication (for non-critical files), providing your password to a
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<command>net use</command> command, or running the service as your own
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user with <literal>cygrunsrv -u</literal> (see
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<literal>/usr/share/doc/Cygwin/cygrunsrv.README</literal> for more
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information).
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</para>
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</answer></qandaentry>
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|
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<qandaentry id="faq.using.path">
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<question><para>How should I set my PATH?</para></question>
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<answer>
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<para>This is done for you in the file /etc/profile, which is sourced by bash
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when you start it from the Desktop or Start Menu shortcut, created by
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<literal>setup.exe</literal>. The line is
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</para>
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<screen>
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PATH="/usr/local/bin:/usr/bin:/bin:$PATH"
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</screen>
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<para>Effectively, this <emphasis role='bold'>prepends</emphasis> /usr/local/bin and /usr/bin to your
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Windows system path. If you choose to reset your PATH, say in
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$HOME/.bashrc, or by editing etc/profile directly, then you should
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follow this rule. You <emphasis role='bold'>must</emphasis> have <literal>/usr/bin</literal> in your PATH
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<emphasis role='bold'>before</emphasis> any Windows system directories. (And you must not omit
|
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the Windows system directories!) Otherwise you will likely encounter
|
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all sorts of problems running Cygwin applications.
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</para>
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<para>If you're using another shell than bash (say, tcsh), the mechanism
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is the same, just the names of the login scripts are different.
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</para>
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</answer></qandaentry>
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<qandaentry id="faq.using.not-found">
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<question><para>Bash (or another shell) says "command not found", but it's right there!</para></question>
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<answer>
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<para>If you compile a program, you might find that you can't run it:
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</para>
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<screen>
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bash$ gcc -o hello hello.c
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bash$ hello
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bash: hello: command not found
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</screen>
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<para>Unlike the Windows default behaviour, Unix shells like bash do not look for programs in <literal>.</literal> (the current
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directory) by default. You can add <literal>.</literal> to your PATH (see above),
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but this is not recommended (at least on UNIX) for security reasons.
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Just tell bash where to find it, when you type it on the command line:
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</para>
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<screen>
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bash$ gcc -o hello hello.c
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bash$ ./hello
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Hello World!
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</screen>
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</answer></qandaentry>
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<qandaentry id="faq.using.converting-paths">
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<question><para>How do I convert between Windows and UNIX paths?</para></question>
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<answer>
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<para>Use the 'cygpath' utility. Type '<literal>cygpath --help</literal>' for
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information. For example (on my installation):
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<screen>
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bash$ cygpath --windows ~/.bashrc
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D:\starksb\.bashrc
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bash$ cygpath --unix C:/cygwin/bin/ls.exe
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/usr/bin/ls.exe
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bash$ cygpath --unix C:\\cygwin\\bin\\ls.exe
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/usr/bin/ls.exe
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</screen>
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Note that bash interprets the backslash '\' as an escape character, so
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you must type it twice in the bash shell if you want it to be recognized
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as such.
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</para>
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</answer></qandaentry>
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|
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<qandaentry id="faq.using.bashrc">
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<question><para>Why doesn't bash read my .bashrc file on startup?</para></question>
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<answer>
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<para>Your .bashrc is read from your home directory specified by the HOME
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environment variable. It uses /.bashrc if HOME is not set. So you need
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to set HOME (and the home dir in your /etc/passwd entry) correctly.
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</para>
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</answer></qandaentry>
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<qandaentry id="faq.using.bash-insensitive">
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<question><para>How can I get bash filename completion to be case insensitive?</para></question>
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<answer>
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<para>Add the following to your <literal>~/.bashrc</literal> file:
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</para>
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<screen>
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shopt -s nocaseglob
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</screen>
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|
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<para>and add the following to your <literal>~/.inputrc</literal> file:
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</para>
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<screen>
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set completion-ignore-case on
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</screen>
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</answer></qandaentry>
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<qandaentry id="faq.using.filename-spaces">
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<question><para>Can I use paths/filenames containing spaces in them?</para></question>
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<answer>
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<para>Cygwin does support spaces in filenames and paths. That said, some
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utilities that use the library may not, since files don't typically
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contain spaces in Unix. If you stumble into problems with this, you
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will need to either fix the utilities or stop using spaces in filenames
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used by Cygwin tools.
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</para>
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<para>In particular, bash interprets space as a word separator. You would have
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to quote a filename containing spaces, or escape the space character.
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For example:
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<screen>
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bash-2.03$ cd '/cygdrive/c/Program Files'
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</screen>
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or
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<screen>
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bash-2.03$ cd /cygdrive/c/Program\ Files
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</screen>
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</para>
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</answer></qandaentry>
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|
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<qandaentry id="faq.using.shortcuts">
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<question><para>Why can't I cd into a shortcut to a directory?</para></question>
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|
<answer>
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<para>Cygwin does not follow MS Windows Explorer Shortcuts
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(*.lnk files). It sees a shortcut as a regular file and this you
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cannot "cd" into it.
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</para>
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<para>Cygwin is also capable to create POSIX symlinks as Windows shortcuts
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(see the CYGWIN environment variable option "winsymlinks"), but these
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shortcuts are different from shortcuts created by native Windows
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|
applications. Windows applications can usually make use of Cygwin
|
|
shortcuts but not vice versa. This is by choice. The reason is that
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Windows shortcuts may contain a bunch of extra information which would
|
|
get lost, if, for example, Cygwin tar archives and extracts them as
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symlinks.
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</para>
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<para>Changing a Cygwin shortcut in Windows Explorer usually changes a Cygwin
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shortcut into a Windows native shortcut. Afterwards, Cygwin will not
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recognize it as symlink anymore.
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</para>
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</answer></qandaentry>
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|
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<qandaentry id="faq.using.find">
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<question><para>I'm having basic problems with find. Why?</para></question>
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<answer>
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<para>Make sure you are using the find that came with Cygwin and that you
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aren't picking up the Win32 find command instead. You can verify that
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you are getting the right one by doing a "type find" in bash.
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</para>
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<para>If the path argument to find, including current directory (default), is
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itself a symbolic link, then find will not traverse it unless you
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specify the <literal>-follow</literal> option. This behavior is different than most
|
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other UNIX implementations, but is not likely to change.
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</para>
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<para>If find does not seem to be producing enough results, or seems to be
|
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missing out some directories, you may be experiencing a problem with one
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of find's optimisations. The absence of <literal>.</literal> and <literal>..</literal>
|
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directories on some filesystems, such as DVD-R UDF, can confuse find.
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See the documentation for the option <literal>-noleaf</literal> in the man page.
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</para>
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</answer></qandaentry>
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|
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<qandaentry id="faq.using.su">
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<question><para>Why doesn't <literal>su</literal> work?</para></question>
|
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<answer>
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<para>The <literal>su</literal> command has been in and out of Cygwin distributions, but
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it has not been ported to Cygwin and has never worked. It is
|
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currently installed as part of the sh-utils, but again, it does not work.
|
|
</para>
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|
<para>You should rather install <literal>sshd</literal> and use
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<literal>ssh username@localhost</literal> as a <literal>su</literal>
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replacement.
|
|
</para>
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<para>For some technical background into why <literal>su</literal> doesn't work, read
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<ulink url="http://www.cygwin.com/ml/cygwin/2003-06/msg00897.html">http://www.cygwin.com/ml/cygwin/2003-06/msg00897.html</ulink> and
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related messages.
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</para>
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</answer></qandaentry>
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|
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<qandaentry id="faq.using.man">
|
|
<question><para>Why doesn't <literal>man -k</literal>,
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<literal>apropos</literal> or <literal>whatis</literal> work?</para></question>
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|
<answer>
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<para>Before you can use <literal>man -k</literal>, <literal>apropos</literal>
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or <literal>whatis</literal>, you
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must create the whatis database. Just run the command
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</para>
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<screen>
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/usr/sbin/makewhatis
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</screen>
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<para>(it may take a minute to complete).
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</para>
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</answer></qandaentry>
|
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|
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<qandaentry id="faq.using.chmod">
|
|
<question><para>Why doesn't <literal>chmod</literal> work?</para></question>
|
|
<answer>
|
|
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|
<para>The most common case is that your <literal>/etc/passwd</literal>
|
|
or <literal>/etc/group</literal> files are not properly set up. If
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<literal>ls -l</literal> shows a group of <literal>mkpasswd</literal>
|
|
or <literal>mkgroup</literal>, you need to run one or both of those
|
|
commands.
|
|
</para>
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<para>If you're using FAT32 instead of NTFS, <literal>chmod</literal>
|
|
will fail since FAT32 does not provide any permission information.
|
|
You should really consider converting the drive to NTFS with
|
|
<literal>CONVERT.EXE</literal>. FAT and FAT32 are barely good enough
|
|
for memory cards or USB sticks to exchange pictures...
|
|
</para>
|
|
<para>For other cases, understand that Cygwin attempts to show UNIX
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|
permissions based on the security features of Windows, so the Windows
|
|
ACLs are likely the source of your problem. See the Cygwin User's
|
|
Guide at <ulink url="http://cygwin.com/cygwin-ug-net/ntsec.html" />
|
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for more information on how Cygwin maps Windows permissions.
|
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</para>
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</answer></qandaentry>
|
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|
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<qandaentry id="faq.using.shell-scripts">
|
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<question><para>Why doesn't my shell script work?</para></question>
|
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<answer>
|
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|
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<para>There are two basic problems you might run into. One is the fact that
|
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<command>/bin/sh</command> is really <command>bash</command>.
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It could be missing some features you might expect in
|
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<command>/bin/sh</command>, if you are used to <command>/bin/sh</command>
|
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actually being <command>zsh</command> (MacOS X "Panther") or
|
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<command>ksh</command> (Tru64).
|
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</para>
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<para>Or, it could be a permission problem, and Cygwin doesn't understand
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that your script is executable. On NTFS or NFS just make the script
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executable using <literal>chmod +x</literal>. However,
|
|
<literal>chmod</literal> may not work due to restrictions of the
|
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filesystem (see FAQ entry above). In this case Cygwin must read the
|
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contents of files to determine if they are executable. If your script
|
|
does not start with
|
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</para>
|
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<screen>
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#! /bin/sh
|
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</screen>
|
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|
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<para>(or any path to a script interpreter, it does not have to be /bin/sh)
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then Cygwin will not know it is an executable script. The Bourne shell
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idiom
|
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</para>
|
|
<screen>
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:
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# This is the 2nd line, assume processing by /bin/sh
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</screen>
|
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<para>also works.
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</para>
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<para>Note that you can use the filesystem flag <literal>cygexec</literal> in
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<filename>/etc/fstab</filename> to force Cygwin to treat all files
|
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under the mount point as executable. This can be used for individual
|
|
files as well as directories. Then Cygwin will not bother to read files
|
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to determine whether they are executable.
|
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</para>
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</answer></qandaentry>
|
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|
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<qandaentry id="faq.using.printing">
|
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<question><para>How do I print under Cygwin?</para></question>
|
|
<answer>
|
|
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<para>lpr is available in the <ulink url="http://cygwin.com/setup.exe">setup.exe</ulink> cygutils package. Some <ulink url="http://cygwin.com/ml/cygwin/2008-05/msg00123.html">usage hints</ulink> are available courtesy of Rodrigo Medina.
|
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</para>
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<para>Jason Tishler has written a couple of messages that explain how to use
|
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a2ps (for nicely formatted text in PostScript) and ghostscript (to print
|
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PostScript files on non-PostScript Windows printers). Start at
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<ulink url="http://cygwin.com/ml/cygwin/2001-04/msg00657.html">http://cygwin.com/ml/cygwin/2001-04/msg00657.html</ulink>. Note that the
|
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<literal>file</literal> command is now available as part of Cygwin setup.
|
|
</para>
|
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<para>Alternatively, you can use the Windows <literal>print</literal>
|
|
command. (It does not seem to be available on Win9x.) Type
|
|
</para>
|
|
<screen>
|
|
bash$ print /\?
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</screen>
|
|
|
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<para>for usage instructions (note the <literal>?</literal> must be escaped from the
|
|
shell).
|
|
</para>
|
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<para>Finally, you can simply <literal>cat</literal> the file to the printer's share name:
|
|
</para>
|
|
<screen>
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|
bash$ cat myfile > //host/printer
|
|
</screen>
|
|
|
|
<para>You may need to press the formfeed button on your printer or append the
|
|
formfeed character to your file.
|
|
</para>
|
|
</answer></qandaentry>
|
|
|
|
<qandaentry id="faq.using.unicode">
|
|
<question><para>Why don't international (Unicode) characters work?</para></question>
|
|
<answer>
|
|
|
|
<para>Internationalization is a complex issue. The short answer is that
|
|
Cygwin relies on the setting of the setting of LANG/LC_xxx environment
|
|
variables. The long answer can be found in the User's Guide in the
|
|
section <ulink url="http://cygwin.com/cygwin-ug-net/setup-locale.html">Internationalization</ulink>
|
|
</para>
|
|
|
|
<para> Cygwin uses UTF-8 by default. To use a different character set, you
|
|
need to set the LC_ALL, LC_CTYPE or LANG environment variables.</para>
|
|
</answer></qandaentry>
|
|
|
|
<qandaentry id="faq.using.weirdchars">
|
|
<question><para>My application prints international characters but I only
|
|
see gray boxes</para></question>
|
|
<answer>
|
|
<para>In the case of Cygwin programs, this likely means that the
|
|
character set as determined by the LC_ALL, LC_CTYPE or LANG environment
|
|
variables does not match the one set on the Text page of the Cygwin Terminal's
|
|
options. Setting the locale in the terminal's options will set the LANG
|
|
variable accordingly.</para>
|
|
<para>Non-Cygwin programs in the Cygwin Terminal do not usually take
|
|
heed of the locale environment variables. Instead, they often use the
|
|
so-called console codepage, which can be determined with the command
|
|
<command>cmd /c chcp</command> followed by the appropriate Windows
|
|
codepage number. The codepage number for Cygwin's default UTF-8 character
|
|
set is 65001.</para>
|
|
</answer></qandaentry>
|
|
|
|
<qandaentry id="faq.using.multiple-copies">
|
|
<question><para>Is it OK to have multiple copies of the DLL?</para></question>
|
|
<answer>
|
|
<para>You should only have one copy of the Cygwin DLL on your system. If you
|
|
have multiple versions, they will conflict and cause problems.
|
|
</para>
|
|
<para>If you get the error "shared region is corrupted" or "shared region
|
|
version mismatch" it means you have multiple versions of cygwin1.dll
|
|
running at the same time which conflict with each other. This could happen,
|
|
for example, if you update cygwin1.dll without exiting
|
|
<emphasis>all</emphasis> Cygwin apps (including inetd) beforehand.
|
|
</para>
|
|
<para>The only DLL that is sanctioned by the Cygwin project is the one that
|
|
you get by running <ulink url="http://cygwin.com/setup.exe">setup.exe</ulink>,
|
|
installed in the directory controlled by this program. If you have other
|
|
versions on your system and desire help from the cygwin project, you should
|
|
delete or rename all DLLs that are not installed by
|
|
<filename>setup.exe</filename>.
|
|
</para>
|
|
<para>If you're trying to find multiple versions of the DLL that are causing
|
|
this problem, reboot first, in case DLLs still loaded in memory are the
|
|
cause. Then use the Windows System find utility to search your whole
|
|
machine, not just components in your PATH (as 'type' would do) or
|
|
cygwin-mounted filesystems (as Cygwin 'find' would do).
|
|
</para>
|
|
</answer></qandaentry>
|
|
|
|
<qandaentry id="faq.using.third-party.multiple-copies">
|
|
<question><para>
|
|
I read the above but I want to bundle Cygwin with a product, and ship it
|
|
to customer sites. How can I do this without conflicting with any
|
|
Cygwin installed by the user?
|
|
</para></question>
|
|
<answer><para>
|
|
Third party developers who wish to use Cygwin should check if
|
|
there is a version of cygwin installed and use the installed
|
|
version if it is newer, or conditionally upgrade if it is not.
|
|
(If you write a tool to make this easy, consider contributing
|
|
it for others to use)
|
|
</para></answer></qandaentry>
|
|
|
|
<qandaentry id="faq.using.bundling-cygwin">
|
|
<question><para>
|
|
Can I bundle Cygwin with my product for free?
|
|
</para></question>
|
|
<answer><para>
|
|
Only if you comply with Cygwin's <ulink
|
|
url="http://cygwin.com/license.html">license</ulink> very carefully. If you
|
|
choose to distribute cygwin1.dll, you must be willing to distribute the
|
|
exact source code used to build that copy of cygwin1.dll as per the
|
|
terms of the GPL. If you ship applications that link with cygwin1.dll,
|
|
you must either provide those applications' source code under a
|
|
GPL-compatible license, *or* purchase a cygwin license from Red Hat.
|
|
</para></answer></qandaentry>
|
|
|
|
<qandaentry id="faq.using.private-cygwin">
|
|
<question><para>
|
|
So I can't install a private version of the Cygwin DLL without
|
|
conflicting with the system cygwin?
|
|
</para></question>
|
|
<answer><para>
|
|
Actually, if you are very careful, you can have two different versions
|
|
of the Cygwin DLL installed on your system at the same time but they
|
|
must be run serially. The only exception from this rule is, if one of
|
|
the DLLs is a pre-1.7 DLL and the other is a 1.7.0 or later DLL. These
|
|
DLLs can work concurrently without knowing about each other due to
|
|
massive changes using shared resources in Cygwin 1.7. However,
|
|
processes using different DLLs will not interact with each other
|
|
correctly, so keep them separate except you really really know what
|
|
you're doing.
|
|
</para>
|
|
<para>This usage is not recommeded for novices. Only limited support will be
|
|
provided in the <ulink url="http://cygwin.com/lists.html">mailing lists</ulink>
|
|
if you run into problems.
|
|
</para></answer></qandaentry>
|
|
|
|
<qandaentry id="faq.using.older-cygwin-conflict">
|
|
<question><para>
|
|
But doesn't that mean that if some application installs an older Cygwin
|
|
DLL on top of a newer DLL, my application will break?
|
|
</para></question>
|
|
<answer><para>
|
|
It depends on what you mean by "break". If the application installs a
|
|
version of the Cygwin DLL in another location than Cygwin's /bin
|
|
directory then the rules in
|
|
<xref linkend="faq.using.third-party.multiple-copies"></xref> apply.
|
|
If the application installs an older version of the DLL in /bin then you
|
|
should complain loudly to the application provider.
|
|
</para><para>
|
|
Remember that the Cygwin DLL strives to be backwards compatible so a
|
|
newer version of the DLL should always work with older executables. So,
|
|
in general, it is always best to keep one version of the DLL on your
|
|
system and it should always be the latest version which matches your
|
|
installed distribution.
|
|
</para></answer></qandaentry>
|
|
|
|
<qandaentry id="faq.using.missing-packages">
|
|
<question><para>Why isn't package XYZ available in Cygwin?</para></question>
|
|
<answer>
|
|
|
|
<para>Probably because there is nobody willing or able to maintain it. It
|
|
takes time, and the priority for the Cygwin Team is the Cygwin package.
|
|
The rest is a volunteer effort. Want to contribute? See
|
|
<ulink url="http://cygwin.com/setup.html">http://cygwin.com/setup.html</ulink>.
|
|
</para>
|
|
</answer></qandaentry>
|
|
|
|
<qandaentry id="faq.using.old-packages">
|
|
<question><para>Why is the Cygwin package of XYZ so out of date?</para></question>
|
|
<answer>
|
|
|
|
<para>(Also: Why is the version of package XYZ older than the version that I
|
|
can download from the XYZ web site? Why is the version of package XYZ
|
|
older than the version that I installed on my linux system? Is there
|
|
something special about Cygwin which requires that only an older version
|
|
of package XYZ will work on it?)
|
|
</para>
|
|
<para>Every package in the Cygwin distribution has a maintainer who is
|
|
responsible for sending out updates of the package. This person is a
|
|
volunteer who is rarely the same person as the official developer of the
|
|
package. If you notice that a version of a package seems to be out of
|
|
date, the reason is usually pretty simple -- the person who is
|
|
maintaining the package hasn't gotten around to updating it yet. Rarely,
|
|
the newer package actually requires complex changes that the maintainer
|
|
is working out.
|
|
</para>
|
|
<para>If you urgently need an update, sending a polite message to the cygwin
|
|
mailing list pinging the maintainer is perfectly acceptable. There are
|
|
no guarantees that the maintainer will have time to update the package
|
|
or that you'll receive a response to your request, however.
|
|
</para>
|
|
<para>Remember that the operative term here is "volunteer".
|
|
</para>
|
|
</answer></qandaentry>
|
|
|
|
<qandaentry id="faq.using.accessing-drives">
|
|
<question><para>How can I access other drives?</para></question>
|
|
<answer>
|
|
|
|
<para>You have some flexibility here.
|
|
</para>
|
|
<para>Cygwin has a builtin "cygdrive prefix" for drives that are not mounted.
|
|
You can access any drive, say Z:, as '/cygdrive/z/'.
|
|
</para>
|
|
<para>In some applications (notably bash), you can use the familiar windows
|
|
<drive>:/path/, using posix forward-slashes ('/') instead of Windows
|
|
backward-slashes ('\'). (But see the warning below!) This maps in the
|
|
obvious way to the Windows path, but will be converted internally to use
|
|
the Cygwin path, following mounts (default or explicit). For example:
|
|
<screen>
|
|
bash$ cd C:/Windows
|
|
bash$ pwd
|
|
/cygdrive/c/Windows
|
|
</screen>
|
|
and
|
|
<screen>
|
|
bash$ cd C:/cygwin
|
|
bash$ pwd
|
|
/
|
|
</screen>
|
|
for a default setup. You could also use backward-slashes in the
|
|
Windows path, but these would have to be escaped from the shell.
|
|
</para>
|
|
<para><emphasis role='bold'>Warning:</emphasis> There is some ambiguity in going from a Windows path
|
|
to the posix path, because different posix paths, through different
|
|
mount points, could map to the same Windows directory. This matters
|
|
because different mount points may be binmode or textmode, so the
|
|
behavior of Cygwin apps will vary depending on the posix path used to
|
|
get there.
|
|
</para>
|
|
<para>You can avoid the ambiguity of Windows paths, and avoid typing
|
|
"/cygdrive", by explicitly mounting drives to posix paths. For example:
|
|
<screen>
|
|
bash$ mkdir /c
|
|
bash$ mount c:/ /c
|
|
bash$ ls /c
|
|
</screen>
|
|
Then <literal>/cygdrive/c/Windows</literal> becomes <literal>/c/Windows</literal> which is a
|
|
little less typing.
|
|
</para>
|
|
<para>Note that you have to enter the mount point into the
|
|
<filename>/etc/fstab</filename> file to keep it indefinitely.
|
|
The mount command will only add the mount point for the lifetime
|
|
of your current Cygwin session.
|
|
</para>
|
|
<para>You can change the default <literal>cygdrive</literal> prefix and whether it is binmode or textmode using the <filename>/etc/fstab</filename> file
|
|
as well. See the Cygwin User's Guide at
|
|
<ulink url="http://cygwin.com/cygwin-ug-net/using.html#mount-table">http://cygwin.com/cygwin-ug-net/using.html#mount-table</ulink>
|
|
for more details.
|
|
</para>
|
|
</answer></qandaentry>
|
|
|
|
<qandaentry id="faq.using.copy-and-paste">
|
|
<question><para>How can I copy and paste into Cygwin console windows?</para></question>
|
|
<answer>
|
|
|
|
<para>First, consider using mintty instead of the standard console
|
|
window. In mintty, selecting with the left-mouse also copies,
|
|
and middle-mouse pastes. It couldn't be easier!
|
|
</para>
|
|
<para>In Windows's console window, open the properties dialog.
|
|
The options contain a toggle button, named "Quick edit mode". It must
|
|
be ON. Save the properties.
|
|
</para>
|
|
<para>You can also bind the insert key to paste from the clipboard by adding
|
|
the following line to your .inputrc file:
|
|
<screen>
|
|
"\e[2~": paste-from-clipboard
|
|
</screen>
|
|
</para>
|
|
</answer></qandaentry>
|
|
|
|
<qandaentry id="faq.using.firewall">
|
|
<question><para>What firewall should I use with Cygwin? </para></question>
|
|
<answer>
|
|
|
|
<para>We have had good reports about Kerio Personal Firewall, ZoneLabs
|
|
Integrity Desktop, and the built-in firewall in Windows XP. Other
|
|
well-known products including ZoneAlarm and Norton Internet Security have
|
|
caused problems for some users but work fine for others. At last report,
|
|
Agnitum Outpost did not work with Cygwin. If you are having strange
|
|
connection-related problems, disabling the firewall is a good
|
|
troubleshooting step (as is closing or disabling all other running
|
|
applications, especially resource-intensive processes such as indexed
|
|
search).
|
|
</para>
|
|
<para>On the whole, Cygwin doesn't care which firewall is used. The few rare
|
|
exceptions have to do with socket code.
|
|
Cygwin uses sockets to implement many of its functions, such as IPC.
|
|
Some overzealous firewalls install themselves deeply into the winsock
|
|
stack (with the 'layered service provider' API) and install hooks
|
|
throughout. Sadly the mailing list archives are littered with examples
|
|
of poorly written firewall-type software that causes things to break.
|
|
Note that with many of these products, simply disabling the firewall
|
|
does not remove these changes; it must be completely uninstalled.
|
|
</para>
|
|
<para>See also <ulink url="http://cygwin.com/faq/faq.using.html#faq.using.bloda" />
|
|
for a list of applications that have been known, at one time or another, to
|
|
interfere with the normal functioning of Cygwin.
|
|
</para>
|
|
</answer></qandaentry>
|
|
|
|
<qandaentry id="faq.using.sharing-files">
|
|
<question><para>How can I share files between Unix and Windows?</para></question>
|
|
<answer>
|
|
|
|
<para>During development, we have Linux boxes running Samba and NFS as well
|
|
as Windows machines. We often build with cross-compilers under Linux and copy
|
|
binaries and source to the Windows system or just toy with them
|
|
directly off the Samba-mounted partition. Or, we use the Microsoft NFS
|
|
client and just use NFS shares on Linux from Windows. And then there are
|
|
tools like <literal>scp</literal>, <literal>ftp</literal>,
|
|
<literal>rsync</literal>, ...
|
|
</para>
|
|
</answer></qandaentry>
|
|
|
|
<qandaentry id="faq.using.case-sensitive">
|
|
<question><para>Is Cygwin case-sensitive??</para></question>
|
|
<answer>
|
|
|
|
<para>Several Unix programs expect to be able to use to filenames
|
|
spelled the same way, but with different case. A prime example
|
|
of this is perl's configuration script, which wants
|
|
<literal>Makefile</literal> and <literal>makefile</literal>. Windows can't
|
|
tell the difference between files with just different case, so the
|
|
configuration fails.
|
|
</para>
|
|
<para>To help with this problem, Cygwin supports case sensitivity
|
|
starting with Cygwin 1.7.0. For a detailed description how to use that
|
|
feature see the Cygwin User's Guilde at
|
|
<ulink url="http://cygwin.com/cygwin-ug-net/using-specialnames.html">http://cygwin.com/cygwin-ug-net/using-specialnames.html</ulink>.
|
|
</para>
|
|
|
|
</answer></qandaentry>
|
|
|
|
<qandaentry id="faq.using.dos-filenames">
|
|
<question><para>What about DOS special filenames?</para></question>
|
|
<answer>
|
|
|
|
<para>In Windows, files cannot be named com1, lpt1, or aux (to name a few);
|
|
either as the root filename or as the extension part. If you do, you'll have
|
|
trouble. Unix programs don't avoid these names which can make things
|
|
interesting. E.g., the perl distribution has a file called
|
|
<literal>aux.sh</literal>. The perl configuration tries to make sure that
|
|
<literal>aux.sh</literal> is there, but an operation on a file with the magic
|
|
letters 'aux' in it will hang.
|
|
</para>
|
|
<para>At least that's what happens when using native Windows tools. Cygwin
|
|
1.7.0 and later can deal with these filenames just fine. Again, see the
|
|
User's Guide at
|
|
<ulink url="http://cygwin.com/cygwin-ug-net/using-specialnames.html">http://cygwin.com/cygwin-ug-net/using-specialnames.html</ulink>
|
|
for a detailed description of what's possible with filenames and what is not.
|
|
</para>
|
|
</answer></qandaentry>
|
|
|
|
<qandaentry id="faq.using.hangs">
|
|
<question><para>When it hangs, how do I get it back?</para></question>
|
|
<answer>
|
|
|
|
<para>If something goes wrong and the tools hang on you for some reason (easy
|
|
to do if you try and read a file called aux.sh), first try hitting ^C to
|
|
return to bash or the cmd prompt.
|
|
</para>
|
|
<para>If you start up another shell, and applications don't run, it's a good
|
|
bet that the hung process is still running somewhere. Use the Task
|
|
Manager, pview, or a similar utility to kill the process.
|
|
</para>
|
|
<para>And, if all else fails, there's always the reset button/power switch.
|
|
In theory this should never be necessary, though.
|
|
</para>
|
|
</answer></qandaentry>
|
|
|
|
<qandaentry id="faq.using.directory-structure">
|
|
<question><para>Why the weird directory structure?</para></question>
|
|
<answer>
|
|
|
|
<para>Why do /lib and /usr/lib (and /bin, /usr/bin) point to the same thing?
|
|
</para>
|
|
<para>Why use mounts instead of symbolic links?
|
|
</para>
|
|
<para>Can I use a disk root (e.g., C:\) as Cygwin root? Why is this discouraged?
|
|
</para>
|
|
<para>After a new installation in the default location, your mount points will
|
|
look something like this:
|
|
</para>
|
|
<screen>
|
|
bash$ mount
|
|
C:\cygwin\bin on /usr/bin type ntfs (binary,auto)
|
|
C:\cygwin\lib on /usr/lib type ntfs (binary,auto)
|
|
C:\cygwin on / type ntfs (binary,auto)
|
|
C: on /cygdrive/c type ntfs (binary,posix=0,user,noumount,auto)
|
|
</screen>
|
|
|
|
<para>Note that /bin and /usr/bin point to the same location, as do /lib and
|
|
/usr/lib. This is intentional, and you should not undo these mounts
|
|
unless you <emphasis>really</emphasis> know what you are doing.
|
|
</para>
|
|
<para>Various applications and packages may expect to be installed in /lib or
|
|
/usr/lib (similarly /bin or /usr/bin). Rather than distinguish between
|
|
them and try to keep track of them (possibly requiring the occasional
|
|
duplication or symbolic link), it was decided to maintain only one
|
|
actual directory, with equivalent ways to access it.
|
|
</para>
|
|
<para>Symbolic links had been considered for this purpose, but were dismissed
|
|
because they do not always work on Samba drives. Also, mounts are
|
|
faster to process because no disk access is required to resolve them.
|
|
</para>
|
|
<para>Note that non-cygwin applications will not observe Cygwin mounts (or
|
|
symlinks for that matter). For example, if you use WinZip to unpack the
|
|
tar distribution of a Cygwin package, it may not get installed to the
|
|
correct Cygwin path. <emphasis>So don't do this!</emphasis>
|
|
</para>
|
|
<para>It is strongly recommended not to make the Cygwin root directory the
|
|
same as your drive's root directory, unless you know what you are doing
|
|
and are prepared to deal with the consequences. It is generally easier
|
|
to maintain the Cygwin hierarchy if it is isolated from, say, C:\. For
|
|
one thing, you avoid possible collisions with other (non-cygwin)
|
|
applications that may create (for example) \bin and \lib directories.
|
|
(Maybe you have nothing like that installed now, but who knows about
|
|
things you might add in the future?)
|
|
</para>
|
|
</answer></qandaentry>
|
|
|
|
<qandaentry id="faq.using.anti-virus">
|
|
<question><para>How do anti-virus programs like Cygwin?</para></question>
|
|
<answer>
|
|
|
|
<para>Users have reported that NAI (formerly McAfee) VirusScan for NT (and
|
|
others?) is incompatible with Cygwin. This is because it tries to scan
|
|
the newly loaded shared memory in cygwin1.dll, which can cause fork() to
|
|
fail, wreaking havoc on many of the tools. (It is not confirmed that
|
|
this is still a problem, however.)
|
|
</para>
|
|
<para>There have been several reports of NAI VirusScan causing the system to
|
|
hang when unpacking tar.gz archives. This is surely a bug in VirusScan,
|
|
and should be reported to NAI. The only workaround is to disable
|
|
VirusScan when accessing these files. This can be an issue during
|
|
setup, and is discussed in that FAQ entry.
|
|
</para>
|
|
<para>Some users report a significant performance hit using Cygwin when their
|
|
anti-virus software is enabled. Rather than disable the anti-virus
|
|
software completely, it may be possible to specify directories whose
|
|
contents are exempt from scanning. In a default installation, this
|
|
would be <literal>C:\cygwin\bin</literal>. Obviously, this could be
|
|
exploited by a hostile non-Cygwin program, so do this at your own risk.
|
|
</para>
|
|
<para>See also <ulink url="http://cygwin.com/faq/faq.using.html#faq.using.bloda" />
|
|
for a list of applications that have been known, at one time or another, to
|
|
interfere with the normal functioning of Cygwin.
|
|
</para>
|
|
</answer></qandaentry>
|
|
|
|
<qandaentry id="faq.using.emacs">
|
|
<question><para>Is there a Cygwin port of GNU Emacs?</para></question>
|
|
<answer>
|
|
|
|
<para>Yes. Install the emacs package. This provides everything you
|
|
need in order to run GNU emacs in a terminal window. If you also want
|
|
to be able to use the X11
|
|
(<ulink url="http://x.cygwin.com/">http://x.cygwin.com/</ulink>)
|
|
GUI, install the emacs-X11 package. In either case, you run emacs by
|
|
typing 'emacs' or '/usr/bin/emacs'.
|
|
</para>
|
|
</answer></qandaentry>
|
|
|
|
<qandaentry id="faq.using.xemacs">
|
|
<question><para>Is there a Cygwin port of XEmacs?</para></question>
|
|
<answer>
|
|
|
|
<para>Yes. It can be used in three different modes:</para>
|
|
<para><itemizedlist>
|
|
<listitem><para>X11 (<ulink url="http://x.cygwin.com/">http://x.cygwin.com/</ulink>) GUI</para></listitem>
|
|
</itemizedlist></para>
|
|
<para>You have to <emphasis>set</emphasis> the DISPLAY environment variable
|
|
before starting xemacs.</para>
|
|
<screen>
|
|
bash$ DISPLAY=127.0.0.1:0 xemacs &
|
|
</screen>
|
|
<para><itemizedlist>
|
|
<listitem><para>Windows native GUI</para></listitem>
|
|
</itemizedlist></para>
|
|
<para>You have to <emphasis>unset</emphasis> the DISPLAY environment variable
|
|
before starting xemacs.</para>
|
|
<screen>
|
|
bash$ DISPLAY= xemacs &
|
|
</screen>
|
|
<para><itemizedlist>
|
|
<listitem><para>Console mode</para></listitem>
|
|
</itemizedlist></para>
|
|
<para>Start xemacs with -nw in a terminal (native or X11) window</para>
|
|
<screen>
|
|
bash$ xemacs -nw
|
|
</screen>
|
|
<para>The current stable Cygwin version of XEmacs is 21.4.x. But there is also a
|
|
Cygwin test release version (21.5.x) available for download via setup.exe.
|
|
</para>
|
|
<para>To use all the standard packages with XEmacs you should download the following
|
|
two packages:</para>
|
|
<para><itemizedlist>
|
|
<listitem><para>xemacs-sumo - XEmacs standard packages</para></listitem>
|
|
<listitem><para>xemacs-mule-sumo - XEmacs MULE (MUlti Lingual Emacs) packages</para></listitem>
|
|
</itemizedlist></para>
|
|
<para>An alternative <emphasis>native</emphasis> distribution of XEmacs for
|
|
Windows based systems can be downloaded from
|
|
<ulink url="http://xemacs.org/Download/win32/index.html">http://xemacs.org/Download/win32/index.html</ulink>.
|
|
It uses an <emphasis>InnoSetup Kit</emphasis> based installer.</para>
|
|
</answer></qandaentry>
|
|
|
|
<qandaentry id="faq.using.ntemacs">
|
|
<question><para>What about NT Emacs?</para></question>
|
|
<answer>
|
|
|
|
<para>If you want GNU Emacs with a native Microsoft GUI interface,
|
|
then you can either use XEmacs (see above), or native
|
|
NT Emacs: see section
|
|
<ulink url="http://www.gnu.org/software/emacs/windows/Getting-Emacs.html#Getting-Emacs">Where can I get pre-compiled versions?</ulink> in NT Emacs FAQ.
|
|
|
|
</para>
|
|
<para>NT Emacs uses the Windows command shell by default. Since it is not a
|
|
Cygwin application, it has no knowledge of Cygwin mounts. With those
|
|
points in mind, you need to add the following code to your ~/.emacs
|
|
(or ~/_emacs) file in order to use Cygwin bash. This is particularly useful
|
|
for the JDEE package (<ulink url="http://jdee.sunsite.dk/">http://jdee.sunsite.dk/</ulink>). The following
|
|
settings are for Emacs 21.1:
|
|
</para>
|
|
<screen>
|
|
|
|
;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
;; Initial setup
|
|
;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
|
|
;; This assumes that Cygwin is installed in C:\cygwin (the
|
|
;; default) and that C:\cygwin\bin is not already in your
|
|
;; Windows Path (it generally should not be).
|
|
|
|
(setq exec-path (cons "C:/cygwin/bin" exec-path))
|
|
(setenv "PATH" (concat "C:\\cygwin\\bin;" (getenv "PATH")))
|
|
|
|
;; LOGNAME and USER are expected in many Emacs packages
|
|
;; Check these environment variables.
|
|
|
|
(if (and (null (getenv "USER"))
|
|
;; Windows includes variable USERNAME, which is copied to
|
|
;; LOGNAME and USER respectively.
|
|
(getenv "USERNAME"))
|
|
(setenv "USER" (getenv "USERNAME")))
|
|
|
|
(if (and (getenv "LOGNAME")
|
|
;; Bash shell defines only LOGNAME
|
|
(null (getenv "USER")))
|
|
(setenv "USER" (getenv "LOGNAME")))
|
|
|
|
(if (and (getenv "USER")
|
|
(null (getenv "LOGNAME")))
|
|
(setenv "LOGNAME" (getenv "USER")))
|
|
|
|
;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
;; (A) M-x shell: This change M-x shell permanently
|
|
;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
|
|
;; Would call Windows command interpreter. Change it.
|
|
|
|
(setq shell-file-name "bash")
|
|
(setenv "SHELL" shell-file-name)
|
|
(setq explicit-shell-file-name shell-file-name)
|
|
|
|
;; Remove C-m (^M) characters that appear in output
|
|
|
|
(add-hook 'comint-output-filter-functions
|
|
'comint-strip-ctrl-m)
|
|
|
|
;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
;; (B) *OR* call following function with M-x my-bash
|
|
;; The M-x shell would continue to run standard Windows shell
|
|
;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
|
|
(defun my-bash (&optional buffer)
|
|
"Run Cygwin Bash shell in optional BUFFER; default *shell-bash*."
|
|
(autoload 'comint-check-proc "comint")
|
|
(interactive
|
|
(let ((name "*shell-bash*"))
|
|
(if current-prefix-arg
|
|
(setq name (read-string
|
|
(format "Cygwin shell buffer (default %s): " name)
|
|
(not 'initial-input)
|
|
(not 'history)
|
|
name)))
|
|
(list name)))
|
|
(or buffer
|
|
(setq buffer "*shell-bash*"))
|
|
(if (comint-check-proc buffer)
|
|
(pop-to-buffer buffer)
|
|
(let* ((shell-file-name "bash")
|
|
(explicit-shell-file-name shell-file-name)
|
|
(explicit-sh-args '("--login" "-i"))
|
|
(explicit-bash-args explicit-sh-args)
|
|
(w32-quote-process-args ?\"));; Use Cygwin quoting rules.
|
|
(shell buffer)
|
|
;; By default Emacs sends "\r\n", but bash wants plain "\n"
|
|
(set-buffer-process-coding-system 'undecided-dos 'undecided-unix)
|
|
;; With TAB completion, add slash path separator, none to filenames
|
|
(make-local-variable 'comint-completion-addsuffix)
|
|
(setq comint-completion-addsuffix '("/" . ""))
|
|
;; This variable is local to buffer
|
|
(setq comint-prompt-regexp "^[ \n\t]*[$] ?"))))
|
|
|
|
</screen>
|
|
|
|
<para>If you want NT Emacs to understand Cygwin paths, get
|
|
cygwin-mount.el from <ulink url="http://www.emacswiki.org/elisp/index.html">http://www.emacswiki.org/elisp/index.html</ulink>.
|
|
</para>
|
|
<para>Note that all of this ``just works'' if you use the Cygwin port of
|
|
Emacs or XEmacs from Cygwin Setup.
|
|
</para>
|
|
</answer></qandaentry>
|
|
|
|
<qandaentry id="faq.using.symlinkstoppedworking">
|
|
<question><para>Why don't some of my old symlinks work anymore?</para></question>
|
|
<answer>
|
|
|
|
<para>Beginning with Cygwin 1.7, Cygwin supports multiple character sets.
|
|
Symlinks created with Cygwin 1.7 are using the UTF-16 character set, which is
|
|
portable across all character sets. Old symlinks were written using your
|
|
current Windows codepage, which is not portable across all character sets.
|
|
If the target of the symlink doesn't resolve anymore, it's very likely that
|
|
the symlink points to a target filename using native, non-ASCII characters,
|
|
and you're now using another character set than way back when you created
|
|
the symlink.</para>
|
|
|
|
<para>Solution: Delete the symlink and create it again under you new Cygwin.
|
|
The new symlink will be correctly point to the target no matter what character
|
|
set you're using in future.</para>
|
|
</answer></qandaentry>
|
|
|
|
<qandaentry id="faq.using.symlinks-samba">
|
|
<question><para>Why don't symlinks work on Samba-mounted filesystems?</para></question>
|
|
<answer>
|
|
|
|
<para>Symlinks are marked with "system" file attribute. Samba does not
|
|
enable this attribute by default. To enable it, consult your Samba
|
|
documentation and then add these lines to your samba configuration
|
|
file:
|
|
</para>
|
|
<screen>
|
|
map system = yes
|
|
create mask = 0775
|
|
</screen>
|
|
|
|
<para>Note that the 0775 can be anything as long as the 0010 bit is set.
|
|
</para>
|
|
<para>Alternatively, use Windows shortcuts as symlinks. See the CYGWIN
|
|
environment variable option "winsymlinks"
|
|
<ulink url="http://cygwin.com/cygwin-ug-net/using-cygwinenv.html">http://cygwin.com/cygwin-ug-net/using-cygwinenv.html</ulink>
|
|
</para>
|
|
</answer></qandaentry>
|
|
|
|
<qandaentry id="faq.using.sshd-in-domain">
|
|
<question><para>How do I setup sshd in a domain?</para></question>
|
|
<answer>
|
|
|
|
<para>
|
|
If you want to be able to logon with domain accounts to a domain member
|
|
machine, you should make sure that the "cyg_server" account under which
|
|
the sshd service is usually running, is a domain account. Otherwise you
|
|
might end up with weird problems. For instance, sshd might fail to load
|
|
the child process when trying to login with a domain account. A potential,
|
|
confirmed error message is
|
|
</para>
|
|
|
|
<screen>
|
|
*** fatal error - unable to load user32.dll, Win32 error 1114
|
|
</screen>.
|
|
|
|
<para>
|
|
Here's how you set up a sshd with a domain service account.
|
|
</para>
|
|
|
|
<para>
|
|
First of all, create a new domain account called "cyg_server". This
|
|
account must be an administrative account, so make sure it's in the
|
|
"Administrators" group. Now create a domain policy which is propagated
|
|
to all machines which are supposed to run an sshd service. This domain
|
|
policy should give the following user rights to the "cyg_server" account:
|
|
</para>
|
|
|
|
<screen>
|
|
Act as part of the operating system (SeTcbPrivilege)
|
|
Create a token object (SeCreateTokenPrivilege)
|
|
Replace a process level token (SeAssignPrimaryTokenPrivilege)
|
|
</screen>
|
|
|
|
<para>
|
|
Now to install sshd on the member machine, logon to that machine as
|
|
an admin. Make sure the aforementioend global policy has been propagated
|
|
to this machine. Examine the Local Security Policy settings and, if
|
|
necessary, call gpupdate.
|
|
</para>
|
|
|
|
<para>
|
|
If everything looks ok, run bash. Starting with Windows Vista, make
|
|
sure you're running bash elevated.
|
|
</para>
|
|
|
|
<para>
|
|
If "cyg_server" is not already in <literal>/etc/passwd</literal>, add it
|
|
using <literal>mkpasswd</literal>. Make sure all domain accounts which are
|
|
supposed to be able to logon via ssh are in <literal>/etc/passwd</literal>.
|
|
Also make sure that all important domain groups are in
|
|
<literal>/etc/group</literal>. If in doubt, call
|
|
</para>
|
|
|
|
<screen>
|
|
$ mkpasswd -l -d your_domain > /etc/passwd
|
|
$ mkgroup -l -d your_domain > /etc/group
|
|
</screen>
|
|
|
|
<para>
|
|
Then run ssh-host-config. Answer all questions so that "cyg_server" is
|
|
used to run the service. When done, check ownership of
|
|
<literal>/var/empty</literal> and all <literal>/etc/ssh*</literal>
|
|
files. All of them must be owned by "cyg_server". If that's ok, you're
|
|
usually all set and you can start the sshd service via
|
|
</para>
|
|
|
|
<screen>
|
|
$ cygrunsrv -S sshd
|
|
</screen>
|
|
|
|
<para>or</para>
|
|
|
|
<screen>
|
|
$ net start sshd
|
|
</screen>
|
|
|
|
</answer></qandaentry>
|
|
|
|
<qandaentry id="faq.using.tcl-tk">
|
|
<question><para>Why do my Tk programs not work anymore?</para></question>
|
|
<answer>
|
|
|
|
<para>Previous versions of Tcl/Tk distributed with Cygwin (e.g. tclsh84.exe,
|
|
wish84.exe) were not actually "Cygwin versions" of those tools.
|
|
They were built as native libraries, which means they did not understand
|
|
Cygwin mounts or symbolic links. This lead to all sorts of problems interacting
|
|
with true Cygwin programs.</para>
|
|
|
|
<para>As of February 2012, this was replaced with a version of Tcl/Tk which
|
|
uses Cygwin's POSIX APIs and X11 for GUI functionality. If you get a message
|
|
such as this when trying to start a Tk app:</para>
|
|
|
|
<screen>
|
|
Application initialization failed: couldn't connect to display ""
|
|
</screen>
|
|
|
|
<para>Then you need to start an X server, or if one is already running, set the
|
|
<literal>DISPLAY</literal> variable to the proper value. The Cygwin distribution
|
|
includes an X server; please see the <ulink url="http://x.cygwin.com/docs/ug/cygwin-x-ug.html">Cygwin/X User Guide</ulink>
|
|
for installation and startup instructions.
|
|
</para></answer></qandaentry>
|
|
|
|
<qandaentry id="faq.using.ipv6">
|
|
<question><para>Why do I get "Address family not supported" errors when playing with IPv6?</para></question>
|
|
<answer>
|
|
|
|
<para>IPv6 is only fully supported and available right from the start
|
|
beginning with Windows Vista and Windows Server 2008.</para>
|
|
|
|
<para>The previous generation of Windows,
|
|
Windows XP and Windows Server 2003, only support IPv6 on an "experimental"
|
|
basis. On these Windows versions, the IPv6 TCP/IP stack is not installed
|
|
automatically, rather the system administrator has to install it manually.
|
|
Unless this has already been done on your machine, your machine is not
|
|
IPv6-capable and that's why you see the "Address family not supported"
|
|
error message. Note, however, that the IPv6 stack on these systems
|
|
don't fully support all features of IPv6.</para>
|
|
|
|
<para>For more information about IPv6 on Windows and how to install the
|
|
IPv6 stack, see the <ulink url="http://www.microsoft.com/technet/network/ipv6/ipv6faq.mspx">Microsoft TechNet IPv6 FAQ article</ulink>
|
|
</para></answer></qandaentry>
|
|
|
|
<qandaentry id="faq.using.bloda" xreflabel="BLODA">
|
|
<question><para>What applications have been found to interfere with Cygwin?</para></question>
|
|
<answer>
|
|
|
|
<para>From time to time, people have reported strange failures and problems in
|
|
Cygwin and Cygwin packages that seem to have no rational explanation. Among
|
|
the most common symptoms they report are fork failures, memory leaks, and file
|
|
access denied problems. These problems, when they have been traced, often appear
|
|
to be caused by interference from other software installed on the same PC. Security
|
|
software, in particular, such as anti-virus, anti-spyware, and firewall applications,
|
|
often implements its functions by installing hooks into various parts of the system,
|
|
including both the Explorer shell and the underlying kernel. Sometimes these hooks
|
|
are not implemented in an entirely transparent fashion, and cause changes in the
|
|
behaviour which affect the operation of other programs, such as Cygwin.
|
|
</para>
|
|
<para>Among the software that has been found to cause difficulties are:</para>
|
|
<para><itemizedlist>
|
|
<listitem><para>Sonic Solutions burning software containing DLA component (when DLA disabled)</para></listitem>
|
|
<listitem><para>Norton/McAfee/Symantec antivirus or antispyware</para></listitem>
|
|
<listitem><para>Logitech webcam software with "Logitech process monitor" service</para></listitem>
|
|
<listitem><para>Kerio, Agnitum or ZoneAlarm Personal Firewall</para></listitem>
|
|
<listitem><para>Iolo System Mechanic/AntiVirus/Firewall</para></listitem>
|
|
<listitem><para>LanDesk</para></listitem>
|
|
<listitem><para>Windows Defender </para></listitem>
|
|
<listitem><para>Various programs by Wave Systems Corp using wxvault.dll, including Embassy Trust Suite and Embassy Security Center</para></listitem>
|
|
<listitem><para>NOD32 Antivirus</para></listitem>
|
|
<listitem><para>ByteMobile laptop optimization client</para></listitem>
|
|
<listitem><para>Earthlink Total-Access</para></listitem>
|
|
<listitem><para>Spybot S&D TeaTimer</para></listitem>
|
|
<listitem><para>AR Soft RAM Disk</para></listitem>
|
|
<listitem><para>ATI Catalyst (some versions)</para></listitem>
|
|
<listitem><para>NVIDIA GeForce (some versions)</para></listitem>
|
|
<listitem><para>Windows LiveOneCare</para></listitem>
|
|
<listitem><para>Webroot Spy Sweeper with Antivirus</para></listitem>
|
|
<listitem><para>COMODO Firewall Pro</para></listitem>
|
|
<listitem><para>PC Tools Spyware Doctor</para></listitem>
|
|
<listitem><para>Avira AntiVir</para></listitem>
|
|
<listitem><para>Panda Internet Security</para></listitem>
|
|
<listitem><para>BitDefender</para></listitem>
|
|
<listitem><para>Google Desktop</para></listitem>
|
|
<listitem><para>Sophos Anti-Virus 7</para></listitem>
|
|
<listitem><para>Bufferzone from Trustware</para></listitem>
|
|
<listitem><para>Lenovo IPS Core Service (ipssvc)</para></listitem>
|
|
<listitem><para>Credant Guardian Shield</para></listitem>
|
|
<listitem><para>AVAST (disable FILESYSTEM and BEHAVIOR realtime shields)</para></listitem>
|
|
<listitem><para>Citrix Metaframe Presentation Server/XenApp (see <ulink url="http://support.citrix.com/article/CTX107825">Citrix Support page</ulink>)</para></listitem>
|
|
</itemizedlist></para>
|
|
<para>Sometimes these problems can be worked around, by temporarily or partially
|
|
disabling the offending software. For instance, it may be possible to disable
|
|
on-access scanning in your antivirus, or configure it to ignore files under the
|
|
Cygwin installation root. Often, unfortunately, this is not possible; even disabling
|
|
the software may not work, since many applications that hook the operating system
|
|
leave their hooks installed when disabled, and simply set them into what is intended
|
|
to be a completely transparent pass-through mode. Sometimes this pass-through is not
|
|
as transparent as all that, and the hooks still interfere with Cygwin; in these cases,
|
|
it may be necessary to uninstall the software altogether to restore normal operation.
|
|
</para>
|
|
<para>Some of the symptoms you may experience are:</para>
|
|
<para><itemizedlist>
|
|
<listitem>
|
|
<para>Random fork() failures.</para>
|
|
<para>Caused by hook DLLs that load themselves into every process in the
|
|
system. POSIX fork() semantics require that the memory map of the child process
|
|
must be an exact duplicate of the parent process' layout. If one of these DLLs
|
|
loads itself at a different base address in the child's memory space as compared
|
|
to the address it was loaded at in the parent, it can end up taking the space that
|
|
belonged to a different DLL in the parent. When Cygwin can't load the original
|
|
DLL at that same address in the child, the fork() call has to fail.
|
|
</para>
|
|
</listitem>
|
|
<listitem>
|
|
<para>File access problems.</para>
|
|
<para>Some programs (e.g., virus scanners with on-access scanning) scan or
|
|
otherwise operate on every file accessed by all the other software running on
|
|
your computer. In some cases they may retain an open handle on the file even
|
|
after the software that is really using the file has closed it. This has been
|
|
known to cause operations such as deletes, renames and moves to fail with
|
|
access denied errors. In extreme cases it has been known for scanners to leak
|
|
file handles, leading to kernel memory starvation.
|
|
</para>
|
|
</listitem>
|
|
<listitem>
|
|
<para>Networking issues</para>
|
|
<para>Firewall software sometimes gets a bit funny about Cygwin. It's not
|
|
currently understood why; Cygwin only uses the standard Winsock2 API, but
|
|
perhaps in some less-commonly used fashion that doesn't get as well tested
|
|
by the publishers of firewalls. Symptoms include mysterious failures to
|
|
connect, or corruption of network data being sent or received.</para>
|
|
</listitem>
|
|
<listitem>
|
|
<para>Memory and/or handle leaks</para>
|
|
<para>Some applications that hook into the Windows operating system exhibit
|
|
bugs when interacting with Cygwin that cause them to leak allocated memory
|
|
or other system resources. Symptoms include complaints about out-of-memory
|
|
errors and even virtual memory exhaustion dialog boxes from the O/S; it is
|
|
often possible to see the excess memory allocation using a tool such as
|
|
Task Manager or Sysinternals' Process Explorer, although interpreting the
|
|
statistics they present is not always straightforward owing to complications
|
|
such as virtual memory paging and file caching.</para>
|
|
</listitem>
|
|
</itemizedlist></para>
|
|
</answer></qandaentry>
|
|
|
|
<qandaentry id='faq.using.fixing-fork-failures'>
|
|
<question><para>How do I fix <literal>fork()</literal> failures?</para></question>
|
|
<answer>
|
|
<para>Unfortunately, Windows does not use the fork/exec model of process creation
|
|
found in UNIX-like OSes, so it is difficult for Cygwin to implement a reliable and
|
|
correct <literal>fork()</literal>, which can lead to error messages such as:</para>
|
|
<para><itemizedlist>
|
|
<listitem>unable to remap <emphasis>somedll</emphasis> to same address as parent</listitem>
|
|
<listitem>couldn't allocate heap</listitem>
|
|
<listitem>died waiting for dll loading</listitem>
|
|
<listitem>child -1 - died waiting for longjmp before initialization</listitem>
|
|
<listitem>STATUS_ACCESS_VIOLATION</listitem>
|
|
<listitem>resource temporarily unavailable</listitem>
|
|
</itemizedlist></para>
|
|
<para>Potential solutions for the above errors:</para>
|
|
<para><itemizedlist>
|
|
<listitem>Restart whatever process is trying (and failing) to use
|
|
<literal>fork()</literal>. Sometimes Windows sets up a process
|
|
environment that is even more hostile to fork() than usual.</listitem>
|
|
<listitem>Ensure that you have eliminated (not just disabled) all
|
|
software on the <xref linkend="faq.using.bloda"/>.
|
|
</listitem>
|
|
<listitem>Read the 'rebase' package README in
|
|
<literal>/usr/share/doc/rebase/</literal>, and follow the
|
|
instructions there to run 'rebaseall'.</listitem>
|
|
</itemizedlist></para>
|
|
<para>Please note that installing new packages or updating existing
|
|
ones undoes the effects of rebaseall and often causes fork() failures
|
|
to reappear. If so, just run rebaseall again.
|
|
</para>
|
|
<para>See the <ulink url="http://cygwin.com/cygwin-ug-net/highlights.html#ov-hi-process">
|
|
process creation</ulink> section of the User's Guide for the technical reasons it is so
|
|
difficult to make <literal>fork()</literal> work reliably.</para>
|
|
</answer>
|
|
</qandaentry>
|
|
</qandadiv>
|