教你在Linux下面怎样截获系统调用

#define MODULE
#define __KERNEL__
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
extern void* sys_call_table[];
/*sys_call_table is exported, so we can access it*/
int (*orig_mkdir)(const char *path);
/*the original systemcall*/
int hacked_mkdir(const char *path)
{
return 0; /*everything is ok, but he new systemcall
does nothing*/
}
int init_module(void) /*module setup*/
{
orig_mkdir=sys_call_table[SYS_mkdir];
sys_call_table[SYS_mkdir]=hacked_mkdir;
return 0;
}
void cleanup_module(void) /*module shutdown*/
{
sys_call_table[SYS_mkdir]=orig_mkdir;
/*set mkdir syscall to the origal
one*/
}