static int ptrace_detach(struct task_struct *child, unsigned int data)
{
bool dead = false;
if (!valid_signal(data))
return -EIO;
/* Architecture-specific hardware disable .. */
ptrace_disable(child);
clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
write_lock_irq(&tasklist_lock);
/*
* This child can be already killed. Make sure de_thread() or
* our sub-thread doing do_wait() didn't do release_task() yet.
*/
if (child->ptrace) {
child->exit_code = data;
dead = __ptrace_detach(current, child);
}
write_unlock_irq(&tasklist_lock);
if (unlikely(dead))
release_task(child);
return 0;
}
int ptrace_detach(struct task_struct *child, unsigned int data)
{
int dead = 0;
if (!valid_signal(data))
return -EIO;
/* Architecture-specific hardware disable .. */
ptrace_disable(child);
clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
write_lock_irq(&tasklist_lock);
/* protect against de_thread()->release_task() */
if (child->ptrace) {
child->exit_code = data;
dead = __ptrace_detach(current, child);
if (!child->exit_state)
wake_up_process(child);
}
write_unlock_irq(&tasklist_lock);
if (unlikely(dead))
release_task(child);
return 0;
}
int ptrace_detach(struct task_struct *child, unsigned int data)
{
if (!valid_signal(data))
return -EIO;
/* Architecture-specific hardware disable .. */
ptrace_disable(child);
write_lock_irq(&tasklist_lock);
/* protect against de_thread()->release_task() */
if (child->ptrace)
__ptrace_detach(child, data);
write_unlock_irq(&tasklist_lock);
return 0;
}
int ptrace_detach(struct task_struct *child, unsigned int data)
{
int ret;
if ((unsigned long) data > _NSIG)
return -EIO;
/* Architecture-specific hardware disable .. */
ptrace_disable(child);
clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
ret = -ESRCH;
write_lock_irq(&tasklist_lock);
/* protect against de_thread()->release_task() */
if (child->ptrace && !child->exit_state) {
__ptrace_detach(child, data);
ret = 0;
}
write_unlock_irq(&tasklist_lock);
return ret;
}
