Re: Re: Re: Your file locations may vary but should be similar
thank you Optimus,
First, let me assure you that i have no intention of hacking, im not a hacker, can't afford to be one...i just code for food man
I have this hello world kernal module code:
Code:
/* Declare what kind of code we want from the header files */
#define __KERNEL__ /* We're part of the kernel */
#define MODULE /* Not a permanent part, though. */
/* Standard headers for LKMs */
#include <linux/modversions.h>
#include <linux/module.h>
#define _LOOSE_KERNEL_NAMES
/* With some combinations of Linux and gcc, tty.h will not compile if
you don't define _LOOSE_KERNEL_NAMES. It's a bug somewhere.
*/
#include <linux/tty.h> /* console_print() interface */
/* Initialize the LKM */
int init_module()
{
console_print("Hello, world - this is the kernel speaking\n");
/* More normal is printk(), but there's less that can go wrong with
console_print(), so let's start simple.
*/
/* If we return a non zero value, it means that
* init_module failed and the LKM can't be loaded
*/
return 0;
}
/* Cleanup - undo whatever init_module did */
void cleanup_module()
{
console_print("Short is the life of an LKM\n");
}
i compile the program using the command:
gcc -c hello.c -Wall
When i compile the program i get the following errors:
/usr/include/linux/modversions.h:1:2: #error Modules should never use kernel-headers system headers,
/usr/include/linux/modversions.h:2:2: #error but rather headers from an appropriate kernel-source package.
/usr/include/linux/modversions.h:3:2: #error Change -I/usr/src/linux/include (or similar) to
/usr/include/linux/modversions.h:4:2: #error -I/lib/modules/$(uname -r)/build/include
/usr/include/linux/modversions.h:5:2: #error to build against the currently-running kernel.
how do i make a program run at system startup?
is there a hirarchy i have to consider?
is there any equivalent to an NT "Service" in unix?
how do you set it up?
thanx
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please can you help me crack this....
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Discussion started by: steveGH
5 Replies
LEARN ABOUT POSIX
create_module
CREATE_MODULE(2) Linux Programmer's Manual CREATE_MODULE(2)NAME
create_module - create a loadable module entry
SYNOPSIS
#include <linux/module.h>
caddr_t create_module(const char *name, size_t size);
Note: No declaration of this system call is provided in glibc headers; see NOTES.
DESCRIPTION
Note: This system call is present only in kernels before Linux 2.6.
create_module() attempts to create a loadable module entry and reserve the kernel memory that will be needed to hold the module. This sys-
tem call requires privilege.
RETURN VALUE
On success, returns the kernel address at which the module will reside. On error, -1 is returned and errno is set appropriately.
ERRORS
EEXIST A module by that name already exists.
EFAULT name is outside the program's accessible address space.
EINVAL The requested size is too small even for the module header information.
ENOMEM The kernel could not allocate a contiguous block of memory large enough for the module.
ENOSYS create_module() is not supported in this version of the kernel (e.g., the kernel is version 2.6 or later).
EPERM The caller was not privileged (did not have the CAP_SYS_MODULE capability).
VERSIONS
This system call is present on Linux only up until kernel 2.4; it was removed in Linux 2.6.
CONFORMING TO
create_module() is Linux-specific.
NOTES
This obsolete system call is not supported by glibc. No declaration is provided in glibc headers, but, through a quirk of history, glibc
versions before 2.23 did export an ABI for this system call. Therefore, in order to employ this system call, it was sufficient to manually
declare the interface in your code; alternatively, you could invoke the system call using syscall(2).
SEE ALSO delete_module(2), init_module(2), query_module(2)COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the
latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.
Linux 2017-09-15 CREATE_MODULE(2)
09-17-2002
