DECLARE_MODULE(9)

NAME

     DECLARE_MODULE -- kernel module declaration macro

SYNOPSIS

     #include <sys/param.h>
     #include <sys/kernel.h>
     #include <sys/module.h>

     DECLARE_MODULE(name, moduledata_t data, sub, order);

DESCRIPTION

     The DECLARE_MODULE() macro declares a generic kernel module.  It is used
     to register the module with the system, using the SYSINIT() macro.
     DECLARE_MODULE() is usually used within other macros, such as
     DRIVER_MODULE(9), DEV_MODULE(9) and SYSCALL_MODULE(9).  However, it can
     be called directly of course, for example in order to implement dynamic
     sysctls.

     The arguments to DECLARE_MODULE():

     name is the name of the module, which will be used in the SYSINIT() call
     to identify the module.

     data is a moduledata_t structure, which contains two main items, the
     official name of the module name, which will be used in the module_t
     structure and a pointer to the event handler function of type
     modeventhand_t.

     sub is an argument directed to the SYSINIT() macro.  Valid values for
     this are contained in the sysinit_sub_id enumeration (see <sys/kernel.h>)
     and specify the type of system startup interfaces.  The DRIVER_MODULE(9)
     macro uses a value of SI_SUB_DRIVERS here for example, since these mod-
     ules contain a driver for a device.  For kernel modules that are loaded
     at runtime, a value of SI_SUB_EXEC is common.

     The order value is another argument for SYSINIT().  It represents the
     KLDs order of initialization within the subsystem.  Valid values are
     defined in the sysinit_elem_order enumeration (<sys/kernel.h>).

SEE ALSO

     DEV_MODULE(9), DRIVER_MODULE(9), module(9), SYSCALL_MODULE(9)

     /usr/include/sys/kernel.h, /usr/share/examples/kld

AUTHORS

     This manual page was written by Alexander Langer <alex@FreeBSD.org>,
     inspired by the KLD Facility Programming Tutorial by Andrew Reiter
     <arr@watson.org>.