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* faq-using.xml (faq.using.bloda): New entry. 

(faq.using.firewall, faq.using.anti-virus):  Link to faq.using.bloda.
	* faq-setup.xml (faq.setup.hang):  Likewise link to faq.using.bloda.
This commit is contained in:
Dave Korn 2007-12-29 18:20:13 +00:00
parent 87b42b7738
commit e1e00b3373
3 changed files with 101 additions and 0 deletions
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6
winsup/doc/ChangeLog
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@ -1,3 +1,9 @@
2007-29-12 Dave Korn <dave.korn@artimi.com>
* faq-using.xml (faq.using.bloda): New entry.
(faq.using.firewall, faq.using.anti-virus): Link to faq.using.bloda.
* faq-setup.xml (faq.setup.hang): Likewise link to faq.using.bloda.
2007-12-16 Christopher Faylor <me+cygwin@cgf.cx>
* pathnames.xml: Fix a typo.

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winsup/doc/faq-setup.xml
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@ -155,6 +155,10 @@ disk if you are paranoid.
<para>This should be safe, but only if Cygwin Setup is not substituted by
something malicious, and no mirror has been compromised.
</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.setup.what-packages">

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winsup/doc/faq-using.xml
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@ -633,6 +633,10 @@ 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">
@ -782,6 +786,10 @@ 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">
@ -950,3 +958,86 @@ means they do not understand Cygwin mounts or symbolic links.
elsewhere in this FAQ.
</para></answer></qandaentry>
<qandaentry id="faq.using.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</para></listitem>
<listitem><para>Norton/MacAffee/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>Embassy Trust Suite fingerprint reader software wxvault.dll</para></listitem>
<listitem><para>NOD32 Antivirus</para></listitem>
<listitem><para>ByteMobile laptop optimization client</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>