NAME glib-genmarshal - C code marshaller generation utility for GLib closures

SYNOPSIS glib-genmarshal [options...] [files...]

DESCRIPTION glib-genmarshal is a small utility that generates C code marshallers for callback functions of the GClosure mechanism in the GObject sublibrary of GLib. The marshaller functions have a standard signature, they get passed in the invoking closure, an array of value structures holding the callback function parameters and a value structure for the return value of the callback. The marshaller is then responsible to call the respective C code function of the closure with all the parameters on the stack and to collect its return value.

INVOCATION glib-genmarshal takes a list of marshallers to generate as input. The marshaller list is either read from standard input or from files passed as additional arguments on the command line.

Options --header Generate header file contents of the marshallers.

--body Generate C code file contents of the marshallers.

--prefix=string, --prefix string Specify marshaller prefix. The default prefix is g_cclosure_marshal.

--skip-source Skip source location remarks in generated comments.

--nostdinc Do not use the standard marshallers of the GObject library, and skip gmarshal.h include directive in generated header files.

--g-fatal-warnings Make warnings fatal, that is, exit immediately once a warning occurs.

-h, --help Print brief help and exit.

-v, --version Print version and exit.

Marshaller list format The marshaller lists are processed line by line, a line can contain a comment in the form of

# this is a comment

or a marshaller specification of the form


(up to 16 PTYPEs may be present).

The RTYPE part specifies the callbacks return type and the PTYPEs right to the colon specify the callbacks parameter list, except for the first and the last arguments which are always pointers.

Parameter types Currently, the following types are supported:

VOID indicates no return type, or no extra parameters. If VOID is used as the parameter list, no additional parameters may be present.

BOOLEAN for boolean types (gboolean)

CHAR for signed char types (gchar)

UCHAR for unsigned char types (guchar)

INT for signed integer types (gint)

UINT for unsigned integer types (guint)

LONG for signed long integer types (glong)

ULONG for unsigned long integer types (gulong)

INT64 for signed 64bit integer types (gint64)

UINT64 for unsigned 64bit integer types (guint64)

ENUM for enumeration types (gint)

FLAGS for flag enumeration types (guint)

FLOAT for single-precision float types (gfloat)

DOUBLE for double-precision float types (gdouble)

STRING for string types (gchar*)

BOXED for boxed (anonymous but reference counted) types (GBoxed*)

PARAM for GParamSpec or derived types (GParamSpec*)

POINTER for anonymous pointer types (gpointer)

OBJECT for GObject or derived types (GObject*)

NONE deprecated alias for VOID

BOOL deprecated alias for BOOLEAN

EXAMPLE To generate marshallers for the following callback functions:

void foo (gpointer data1, gpointer data2); void bar (gpointer data1, gint param1, gpointer data2); gfloat baz (gpointer data1, gboolean param1, guchar param2, gpointer data2);

The marshaller list has to look like this:


The generated marshallers have the arguments encoded in their function name. For this particular list, they are

g_cclosure_marshal_VOID__VOID(), g_cclosure_marshal_VOID__INT(), g_cclosure_marshal_FLOAT__BOOLEAN_UCHAR().

They can be used directly for GClosures or be passed in as the GSignalCMarshaller c_marshaller; argument upon creation of signals:

GClosure *cc_foo, *cc_bar, *cc_baz;

cc_foo = g_cclosure_new (NULL, foo, NULL); g_closure_set_marshal (cc_foo, g_cclosure_marshal_VOID__VOID); cc_bar = g_cclosure_new (NULL, bar, NULL); g_closure_set_marshal (cc_bar, g_cclosure_marshal_VOID__INT); cc_baz = g_cclosure_new (NULL, baz, NULL); g_closure_set_marshal (cc_baz, g_cclosure_marshal_FLOAT__BOOLEAN_UCHAR);

SEE ALSO glib-mkenums(1)

BUGS None known yet.

AUTHOR glib-genmarshal has been written by Tim Janik <>.

This manual page was provided by Tim Janik <>.

08/22/2005 GLIB-GENMARSHAL(1)