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.

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

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

RTYPE:PTYPE RTYPE:PTYPE,PTYPE RTYPE:PTYPE,PTYPE,PTYPE

The RTYPE part specifies the callback's return type and the PTYPEs right to the colon specify the callback's 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*)

VARIANT for GVariant types (GVariant*)

NONE deprecated alias for VOID

BOOL deprecated alias for BOOLEAN