244 lines
8.5 KiB
Plaintext
244 lines
8.5 KiB
Plaintext
<sect1 id="using-cygwinenv"><title>The <envar>CYGWIN</envar> environment
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variable</title>
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<sect2 id="cygwinenv-implemented-options">
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<title>Implemented options</title>
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<para>The <envar>CYGWIN</envar> environment variable is used to configure
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many global settings for the Cygwin runtime system. It contains the options
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listed below, separated by blank characters. Many options can be turned off
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by prefixing with <literal>no</literal>.</para>
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<itemizedlist mark="bullet">
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<listitem>
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<para><envar>(no)detect_bloda</envar> - If set, Cygwin will try to detect
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foreign applications which try to inject threads into a Cygwin process,
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or which redirect system sockets by providing an enforced so-called
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<literal>Layered Service Provider</literal>. This may or may not help to
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detect <ulink url="http://cygwin.com/faq/faq.using.html#faq.using.bloda">
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BLODAs</ulink>. Don't use this option for day-to-day usage, it will slow
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down every thread and socket creation!</para>
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</listitem>
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<listitem>
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<para><envar>(no)dosfilewarning</envar> - If set, Cygwin will warn the
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first time a user uses an "MS-DOS" style path name rather than a POSIX-style
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path name. Defaults to set.</para>
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</listitem>
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<listitem>
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<para><envar>(no)export</envar> - If set, the final values of these
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settings are re-exported to the environment as <envar>CYGWIN</envar> again.
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Defaults to off.</para>
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</listitem>
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<listitem>
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<para>
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<envar>error_start:Win32filepath</envar> - if set, runs
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<filename>Win32filepath</filename> when cygwin encounters a fatal error,
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which is useful for debugging. <filename>Win32filepath</filename> is
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usually set to the path to <command>gdb</command> or
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<command>dumper</command>, for example
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<filename>C:\cygwin\bin\gdb.exe</filename>.
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There is no default set.
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</para>
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</listitem>
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<listitem>
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<para><envar>(no)glob[:ignorecase]</envar> - if set, command line arguments
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containing UNIX-style file wildcard characters (brackets, braces, question mark,
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asterisk, escaped with \) are expanded into lists of files that match
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those wildcards.
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This is applicable only to programs run from non-Cygwin programs such as a CMD prompt.
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That means that this setting does not affect globbing operations for shells such as
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bash, sh, tcsh, zsh, etc.
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Default is set.</para>
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<para>This option also accepts an optional <literal>[no]ignorecase</literal> modifer.
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If supplied, wildcard matching is case insensitive. The default is <literal>noignorecase</literal></para>
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</listitem>
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<listitem>
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<para><envar>(no)pipe_byte</envar> - causes Cygwin to open pipes in byte mode rather than
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message mode.</para>
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</listitem>
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<listitem>
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<para><envar>proc_retry:n</envar> - causes <function>fork()</function> and
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<function>exec*()</function> to retry n times when a child process fails
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due to certain windows-specific errors. These errors usually occur when
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processes are being started while a user is logging off.
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</para>
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</listitem>
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<listitem>
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<para><envar>(no)reset_com</envar> - if set, serial ports are reset
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to 9600-8-N-1 with no flow control when used. This is done at open
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time and when handles are inherited. Defaults to set.</para>
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</listitem>
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<listitem>
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<para><envar>(no)winsymlinks</envar> - if set, Cygwin creates
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symlinks as Windows shortcuts with a special header and the R/O attribute
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set. If not set, Cygwin creates symlinks as plain files with a magic number,
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a path and the system attribute set. Defaults to not set since plain
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file symlinks are faster to write and faster to read.</para>
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<para>Please note that symlinks created under Cygwin 1.7 or later are
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not readable by older Cygwin releases because the new symlinks use UTF-16
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to encode the target filename, while the old symlinks used the current
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ANSI or OEM charset.</para>
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</listitem>
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</itemizedlist>
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</sect2>
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<sect2 id="cygwinenv-removed-options">
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<title>Obsolete options</title>
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<para>
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Certain CYGWIN options available in past releases have been removed in
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Cygwin 1.7 for one reason or another. These obsolete options are listed
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below.</para>
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<itemizedlist mark="bullet">
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<listitem>
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<para><envar>(no)binmode</envar> - This option has been removed because
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all file opens default to binary mode, unless the open mode has been specified
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explicitly in the open(2) call.
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</para>
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</listitem>
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<listitem>
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<para><envar>check_case</envar> - This option has been removed in favor of
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real case sensitivity and the per-mount option "posix=[0|1]". For more
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information, read the documentation in <xref linkend="mount-table"></xref> and
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<xref linkend="pathnames-casesensitive"></xref>.</para>
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</listitem>
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<listitem>
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<para><envar>codepage:[ansi|oem]</envar> - This option controlled
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which character set is used for file and console operations. Since Cygwin
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is now doing all character conversion by itself, depending on the
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application call to the <function>setlocale()</function> function, and in
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turn by the setting of the environment variables <envar>$LANG</envar>,
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<envar>$LC_ALL</envar>, or <envar>$LC_CTYPE</envar>, this setting
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became superfluous.</para>
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</listitem>
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<listitem>
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<para><envar>(no)envcache</envar> - Originally, <envar>envcache</envar>
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controlled caching of environment variable conversion between Win32 and
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POSIX. The default setting works fine, the option was just useless.</para>
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</listitem>
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<listitem>
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<para><envar>forkchunk:[intval]</envar> - This option allowed to influence
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the <function>fork()</function> function in the way the memory of the
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parent process gets copied to the child process. This functionality was
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only useful for Windows 95/98/Me.
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</para>
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</listitem>
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<listitem>
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<para><envar>(no)ntea</envar> - This option has been removed since it
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only fakes security which is considered dangerous and useless. It also
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created an uncontrollably large file on FAT and was entirely useless
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on FAT32.</para>
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</listitem>
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<listitem>
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<para><envar>(no)ntsec</envar> - This option has been removed in favor of
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the per-mount option "acl"/"noacl". For more information, read the
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documentation in <xref linkend="mount-table"></xref>.</para>
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</listitem>
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<listitem>
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<para><envar>(no)server</envar> - Originally this option had to be
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enabled on the client side to use features only available when running
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<command>cygserver</command>. This option has been removed because Cygwin now
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always tries to contact cygserver if a function is called which requires
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cygserver being available. For more information, read the documentation
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in <xref linkend="using-cygserver"></xref>.</para>
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</listitem>
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<listitem>
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<para><envar>(no)smbntsec</envar> - This option has been removed in favor of
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the per-mount option "acl"/"noacl". For more information, read the
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documentation in <xref linkend="mount-table"></xref>.</para>
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</listitem>
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<listitem>
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<para><envar>(no)strip_title</envar> - Removed because setting the Window title
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can be controlled by the application via Escape sequences.</para>
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</listitem>
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<listitem>
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<para><envar>(no)title</envar> - Removed because setting the Window title
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can be controlled by the application via Escape sequences.</para>
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</listitem>
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<listitem>
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<para><envar>(no)transparent_exe</envar> - This option has been removed
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because the behaviour it switched on is now the standard behaviour in
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Cygwin.</para>
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</listitem>
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<listitem>
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<para><envar>(no)traverse</envar> - This option has been removed because
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traverse checking is not quite correctly implemented by Microsoft and
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it's behaviour has been getting worse with each new OS version. This
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complicates its usage so the option has been removed for now.</para>
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</listitem>
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<listitem>
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<para><envar>(no)tty</envar> - If set, Cygwin enabled extra support
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(i.e., termios) for UNIX-like ttys in the Windows console. This option
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has been removed because it can be easily replaced by using a terminal
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like <command>mintty</command>, and it does not work well with some
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Windows programs.</para>
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</listitem>
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<listitem>
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<para><envar>(no)upcaseenv</envar> - This option could be used to convert
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all environment variables to uppercase. This was the default behavior in
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releases prior to Cygwin 1.7. Since keeping the case of environment
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variables intact is POSIXly correct, Cygwin now does not change the case
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of environment variables, except for a restricted set to maintain minimal
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backward compatibility. The current list of always uppercased variables is:
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</para>
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<screen>
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ALLUSERSPROFILE
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COMMONPROGRAMFILES
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COMPUTERNAME
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COMSPEC
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HOME
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HOMEDRIVE
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HOMEPATH
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NUMBER_OF_PROCESSORS
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OS
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PATH
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PATHEXT
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PROCESSOR_ARCHITECTURE
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PROCESSOR_IDENTIFIER
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PROCESSOR_LEVEL
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PROCESSOR_REVISION
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PROGRAMFILES
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SYSTEMDRIVE
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SYSTEMROOT
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TEMP
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TERM
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TMP
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TMPDIR
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WINDIR
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</screen>
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</listitem>
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</itemizedlist>
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</sect2>
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</sect1>
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