Linux 0.01: *p = *current;

gistfile1.txt

include/linux/sched.h:
    :
extern struct task_struct *current;
    :

kernel/sched.c:
    :
union task_union {
        struct task_struct task;
        char stack[PAGE_SIZE];
};

static union task_union init_task = {INIT_TASK,};

long volatile jiffies=0;
long startup_time=0;
struct task_struct *current = &(init_task.task), *last_task_used_math = NULL;

struct task_struct * task[NR_TASKS] = {&(init_task.task), };
    :

kernel/fork.c:
/*                                                                                            
 *  Ok, this is the main fork-routine. It copies the system process                           
 * information (task[nr]) and sets up the necessary registers. It                             
 * also copies the data segment in it's entirety.                                             
 */
int copy_process(int nr,long ebp,long edi,long esi,long gs,long none,
                long ebx,long ecx,long edx,
                long fs,long es,long ds,
                long eip,long cs,long eflags,long esp,long ss)
{
        struct task_struct *p;
        int i;
        struct file *f;

        p = (struct task_struct *) get_free_page();
        if (!p)
                return -EAGAIN;
        *p = *current;  /* NOTE! this doesn't copy the supervisor stack */
        p->state = TASK_RUNNING;
        p->pid = last_pid;
        p->father = current->pid;
        p->counter = p->priority;
        p->signal = 0;
        p->alarm = 0;
    :