glib-genmarshal - C code marshaller generation utility for GLib closures
glib-genmarshal [OPTION...] [FILE...]
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 standard input or from files passed as additional arguments on the command line. 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 (up to 16 PTYPEs may be present). 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
--header Generate header file contents of the marshallers. --body Generate C code file contents of the marshallers. --prefix=PREFIX Specify marshaller prefix. The default prefix is `g_cclosure_marshal'. --skip-source Skip source location remarks in generated comments. --stdinc Use the standard marshallers of the GObject library, and include gmarshal.h in generated header files. --nostdinc Do not use the standard marshallers of the GObject library, and skip gmarshal.h include directive in generated header files. --internal Mark generated functions as internal, using G_GNUC_INTERNAL. --valist-marshallers Generate valist marshallers, for use with g_signal_set_va_marshaller(). -v, --version Print version information. --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. --output=FILE Write output to FILE instead of stdout.
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 file has to look like this: VOID:VOID VOID:INT FLOAT:BOOLEAN,UCHAR and you call glib-genmarshal like this: glib-genmarshal --header marshaller.list > marshaller.h glib-genmarshal --body marshaller.list > marshaller.c The generated marshallers have the arguments encoded in their function name. For this particular list, they are g_cclosure_user_marshal_VOID__VOID(), g_cclosure_user_marshal_VOID__INT(), g_cclosure_user_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_user_marshal_VOID__VOID); cc_bar = g_cclosure_new (NULL, bar, NULL); g_closure_set_marshal (cc_bar, g_cclosure_user_marshal_VOID__INT); cc_baz = g_cclosure_new (NULL, baz, NULL); g_closure_set_marshal (cc_baz, g_cclosure_user_marshal_FLOAT__BOOLEAN_UCHAR);
Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.
Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.
Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.
Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.
The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.
Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.
Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.
Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.