When a module is loaded into a running kernel, the init_module(9) function within that object file is called to set up the module. The implementation of that function initializes local features and uses functions such as register_chrdev(9) to attach itself to the kernel. It then returns zero(0) if it succeeds. If there is a problem or the module decides that it cannot be loaded, it returns instead an error code (i.e. -ENODEV) and the kernel releases the module again.
Once loaded, the cleanup_module(9) function of a module is used by the kernel to remove the module again. The module detaches itself from the kernel and returns.
RETURN VALUE
The init_module(9) function returns 0 on success, or an error code <0 if the module cannot be initialized.AVAILABILITY
Linux 1.0+SEE ALSO
MOD_INC_USE_COUNT(9), insmod(1)Also list some source files for the kernel that implement the functions of the page.
AUTHOR
Stephen Williams <steve@icarus.com>BUGS
It is entirely up to the driver to be sure it is detached from the kernel when unloaded. If a module makes an error in this regard, bad things may happen.
Index
- NAME
- SYNOPSIS
- DESCRIPTION
- RETURN VALUE
- AVAILABILITY
- SEE ALSO
- AUTHOR
- BUGS
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