mono-config - Mono runtime file format configuration
The Mono runtime will load configuration data from the installation prefix
/etc/mono/config file, the ~/.mono/config or from the file pointed by the
MONO_CONFIG environment variable.
For each assembly loaded a config file with the name:
/path/to/the/assembly.exe.config is loaded as well as the
This file controls the behavior of the runtime.
The file contains an XML-like file with various sections, all of them contained
inside a section (It actually uses GMarkup to parse the file).
This page describes the Unix-specific and Mono-specific extensions to the
configuration file; For complete details, see the
http://www.mono-project.com/Config web page.
You use the dllmap directive to map shared libraries referenced by P/Invoke in
your assemblies to a different shared library.
This is typically used to map Windows libraries to Unix library names. The
element takes two attributes:
- This should be the same string used in the DllImport attribute, optionally
prefixed with "i:" to indicate that the string must be matched
in a case-insensitive way
- This should be the name of the library where the function can be found:
this name should be suitable for use with the platform native shared
library loading routines (dlopen etc.), so you may want to check the
manpages for that, too.
This directive can be used to map a specific dll/function pair to a different
library and also a different function name. It should appear inside a
element with only the dll attribute specified.
element takes 3 attributes:
- This is the target library, where the function can be found.
- This is the name of the function as it appears in the metadata: it is the
name of the P/Invoke method.
- This is the name of the function to lookup instead of the name specified
in the P/Invoke method.
Both the dllmap
and the dllentry
elements allow the following two
attributes which make it easy to use a single configuration file and support
multiple operating systems and architectures with different mapping
- This is the name of the operating system for which the mapping should be
applied. Allowed values are: linux, osx, solaris, freebsd, openbsd,
netbsd, windows, aix, hpux.
- This is the name of the architecture for which the mapping should be
applied. Allowed values are: x86, x86-64, sparc, ppc, s390, s390x, arm,
mips, alpha, hppa, ia64.
- This is the size of registers on the target architecture, it can be either
32 or 64.
The attribute value for both attributes can be a comma-separated list of the
allowed values. Additionally, the first character may be a '!'
reverse the meaning. An attribute value of "!windows,osx", for
example, would mean that the entry is considered on all operating systems,
except on Windows and OS X. No spaces are allowed in any part of the value.
Note that later entries will override the entries defined earlier in the file.
The following example maps references to the `cygwin1.dll' shared library to the
<dllmap dll="i:cygwin1.dll" target="libc.so.6"/>
The library name in the DllImport attribute is allowed to be in any case
variant, like the following examples:
This one maps the following C# method:
static extern void somefunction ();
, but to the same function
in the library libanother.so
when running under the Solaris and FreeBSD
<dllentry dll="libdifferent.so" name="somefunction" target="differentfunction" />
<dllentry os="solaris,freebsd" dll="libanother.so" name="somefunction" target="differentfunction" />