Understanding Linux Network Internals

Functions and Variables Featured in This Chapter

Table 7-4 summarizes the functions, macros, structures, and variables introduced in the chapter.

Table 7-4. Functions, macros, variables, and data structures introduced in this chapter

Name	Description
Functions and macros
_ _init, _ _exit, _ _initcall, _ _exitcall, _ _initdata, _ _exitdata, _ _devinit, _ _devexit, _ _devexit_p, _ _devinitdata, _ _devexitdata, xxx_initcall	Macros used to tag pieces of code with special characteristics. These tags can be used to optimize the kernel image size, leaving out unneeded code, for instance.
do_initcalls	Executes at boot time all the functions tagged with the xxx _initcall macros.
init_module, cleanup_module, module_init, module_exit	The first two are the names of the functions that each module should provide to respectively initialize and remove a module. The other two are macros that allow device driver writers to use an arbitrary name for the previous two routines.
netdev_boot, setup_check, netdev_boot_setup_add	Apply the boot-time configuration (if any) to a specific device.
module_param	Defines optional module parameters that can be provided when loading the module.
Data structures
kernel_param	Stores the input to the module_param macro.
obs_kernel_param	Stores the input to the _ _setup macro.
netdev_boot_setup, ifmap	netdev_boot_setup stores boot-time parameters for the ether= and netdev= options. ifmap is one of the fields of netdev_boot_setup.