I wrote following program in my home directory.
#include <linux/kernel.h>
#include <sys/syscall.h>
#include <linux/module.h>
extern void *sys_table[];
asmlinkage int(*main_sys_exit)(int);
{
printk("Sys_exit called with err_code=%d\n",err_code);
return main_sys_exit(err_code);
}
int init_module()
{
main_sys_exit=sys_table[__NR_exit];
sys_table[__NR_exit]=alt_exit_function;
}
void cleanup_module()
{
sys_table[__NR_exit]=main_sys_exit;
}
~ [/code]
When I compiled it as
gcc -Wall -DMODULE -D__KERNEL__ -DLINUX -c sample2.c[/code]
I got following error
sample2.c:3:26: error: linux/module.h: No such file or directory
sample2.c:5: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’
before ‘int’
sample2.c:6: error: expected identifier or ‘(’ before ‘{’ token
sample2.c: In function ‘init_module’:
sample2.c:13: error: ‘main_sys_exit’ undeclared (first use in this function)
sample2.c:13: error: (Each undeclared identifier is reported only once
sample2.c:13: error: for each function it appears in.)
sample2.c:14: error: ‘alt_exit_function’ undeclared (first use in this function)
sample2.c:15: warning: control reaches end of non-void function
sample2.c: In function ‘cleanup_module’:
sample2.c:18: error: ‘main_sys_exit’ undeclared (first use in this function)
What is the above error and why is it coming?
I did all this in my home directory.
--
Tapas
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