DECLARE_MODULE(9) | FreeBSD Kernel Developer's Manual | DECLARE_MODULE(9) |
NAME
DECLARE_MODULE — kernel module declaration macroSYNOPSIS
#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). Of course, it can also be called directly, for example in order to implement dynamic sysctls.The arguments it expects are:
- name
- The module name, which will be used in the SYSINIT() call to identify the module.
- data
- 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
- 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 modules contain a driver for a device. For kernel modules that are loaded at runtime, a value of SI_SUB_EXEC is common.
- order
- An 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 <alex@FreeBSD.org>, inspired by the KLD Facility Programming Tutorial by <arr@watson.org>.January 6, 2005 | FreeBSD |