SYSCALL_DEFINE5(clone, unsigned long, clone_flags, unsigned long, newsp,
int __user *, parent_tidptr,
int __user *, child_tidptr,
unsigned long, tls)
#endif
{
return _do_fork(clone_flags, newsp, 0, parent_tidptr, child_tidptr, tls);
}
/* For compatibility with architectures that call do_fork directly rather than
* using the syscall entry points below. */
long do_fork(unsigned long clone_flags,
unsigned long stack_start,
unsigned long stack_size,
int __user *parent_tidptr,
int __user *child_tidptr)
{
return _do_fork(clone_flags, stack_start, stack_size,
parent_tidptr, child_tidptr, 0);
}
void pm_thread() {
static Msg m;
PCB* pcb;
while (true) {
receive(ANY, &m);
if (m.src == MSG_HARD_INTR) {
//do nothting
} else if (m.type == NEW_PROCESS) {
//TODO: only first file here, I should change it
uint32_t *file_name_buf = (uint32_t*)m.buf;
size_t sz = do_read(file_name_buf[0], buf, 0, FILE_SIZE);
assert(sz == FILE_SIZE);
pcb = create_process(buf);
m.ret = pcb->pid;
m.dest = m.src;
m.src = PM;
send(m.dest, &m);
} else if (m.type == FORK) {
PCB *old = fetch_pcb(m.req_pid);
pid_t new_pid = _do_fork(old);
m.ret = new_pid;
m.dest = m.src;
m.src = PM;
send(m.dest,&m);
//for child process
m.ret = 0;
m.dest = new_pid; //send to new_pid
m.src = PM;
send(m.dest,&m);
}
else {
assert(0);
}
}
}
/*
* Create a kernel thread.
*/
pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
{
return _do_fork(flags|CLONE_VM|CLONE_UNTRACED, (unsigned long)fn,
(unsigned long)arg, NULL, NULL, 0);
}