asmlinkage long sys_setsid(void)
{
struct task_struct *group_leader = current->group_leader;
pid_t session;
int err = -EPERM;
mutex_lock(&tty_mutex);
write_lock_irq(&tasklist_lock);
/* Fail if I am already a session leader */
if (group_leader->signal->leader)
goto out;
session = group_leader->pid;
/* Fail if a process group id already exists that equals the
* proposed session id.
*
* Don't check if session id == 1 because kernel threads use this
* session id and so the check will always fail and make it so
* init cannot successfully call setsid.
*/
if (session > 1 && find_task_by_pid_type(PIDTYPE_PGID, session))
goto out;
group_leader->signal->leader = 1;
__set_special_pids(session, session);
group_leader->signal->tty = NULL;
group_leader->signal->tty_old_pgrp = 0;
err = process_group(group_leader);
out:
write_unlock_irq(&tasklist_lock);
mutex_unlock(&tty_mutex);
return err;
}
static int __init ddump_mt_init(void)
{
//int ret;
//int index;
ddump_nr_cpus = num_online_cpus();
printk("James: cpu # is %d\n", ddump_nr_cpus);
ddump_current_cpu = smp_processor_id();
printk("James: current_cpu # is %d\n", ddump_current_cpu);
printk("James: end_pfn is %lu, mem size is %lu\n", end_pfn, end_pfn * 4096);
// init
atomic64_set(&app_zero_pages, 0);
atomic64_set(&app_non_zero_pages, 0);
atomic64_set(&app_other_pages, 0);
// create helper
ddump_percpu_thread_create();
// set up the target
if (target_pid == -1) {
printk("No pid addigned\n");
return -1;
}
ddump_tp = find_task_by_pid_type(PIDTYPE_PID, target_pid);
printk("James: panic_thread is %p, pid %d\n", ddump_tp, ddump_tp->pid);
run_master_thread();
return 0;
}
struct task_struct *find_task_by_pid(int nr)
{
return find_task_by_pid_type(0, nr);
}
struct task_struct *find_task_by_pid_ns(int nr, struct pid_namespace *ns)
{
/* we don't implement PID name spaces */
return find_task_by_pid_type(0, nr);
}
