asmlinkage long sys_setsid(void)
{
struct pid *pid;
int err = -EPERM;
if (!thread_group_leader(current))
return -EINVAL;
down(&tty_sem);
write_lock_irq(&tasklist_lock);
pid = find_pid(PIDTYPE_PGID, current->pid);
if (pid)
goto out;
current->signal->leader = 1;
__set_special_pids(current->pid, current->pid);
current->signal->tty = NULL;
current->signal->tty_old_pgrp = 0;
err = process_group(current);
out:
write_unlock_irq(&tasklist_lock);
up(&tty_sem);
return err;
}
asmlinkage long sys_setsid(void)
{
struct task_struct *group_leader = current->group_leader;
struct pid *sid = task_pid(group_leader);
pid_t session = pid_vnr(sid);
int err = -EPERM;
write_lock_irq(&tasklist_lock);
/* Fail if I am already a session leader */
if (group_leader->signal->leader)
goto out;
/* Fail if a process group id already exists that equals the
* proposed session id.
*/
if (pid_task(sid, PIDTYPE_PGID))
goto out;
group_leader->signal->leader = 1;
__set_special_pids(sid);
spin_lock(&group_leader->sighand->siglock);
group_leader->signal->tty = NULL;
spin_unlock(&group_leader->sighand->siglock);
err = session;
out:
write_unlock_irq(&tasklist_lock);
return err;
}
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 kernel_init(void * unused)
{
#ifndef __LINSCHED__
lock_kernel();
/*
* init can run on any cpu.
*/
set_cpus_allowed(current, CPU_MASK_ALL);
/*
* Tell the world that we're going to be the grim
* reaper of innocent orphaned children.
*
* We don't want people to have to make incorrect
* assumptions about where in the task array this
* can be found.
*/
init_pid_ns.child_reaper = current;
__set_special_pids(1, 1);
cad_pid = task_pid(current);
smp_prepare_cpus(max_cpus);
do_pre_smp_initcalls();
smp_init();
#endif /* __LINSCHED__ */
sched_init_smp();
#ifndef __LINSCHED__
cpuset_init_smp();
do_basic_setup();
/*
* check if there is an early userspace init. If yes, let it do all
* the work
*/
if (!ramdisk_execute_command)
ramdisk_execute_command = "/init";
if (sys_access((const char __user *) ramdisk_execute_command, 0) != 0) {
ramdisk_execute_command = NULL;
prepare_namespace();
}
/*
* Ok, we have completed the initial bootup, and
* we're essentially up and running. Get rid of the
* initmem segments and start the user-mode stuff..
*/
init_post();
#endif /* __LINSCHED__ */
return 0;
}
static int __init kernel_init(void * unused)
{
/*
* Wait until kthreadd is all set-up.
*/
wait_for_completion(&kthreadd_done);
lock_kernel();
/*
* init can run on any cpu.
*/
set_cpus_allowed(current, CPU_MASK_ALL);
/*
* Tell the world that we're going to be the grim
* reaper of innocent orphaned children.
*
* We don't want people to have to make incorrect
* assumptions about where in the task array this
* can be found.
*/
init_pid_ns.child_reaper = current;
__set_special_pids(1, 1);
cad_pid = task_pid(current);
smp_prepare_cpus(max_cpus);
do_pre_smp_initcalls();
smp_init();
sched_init_smp();
cpuset_init_smp();
do_basic_setup();
/* Open the /dev/console on the rootfs, this should never fail */
if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0)
printk(KERN_WARNING "Warning: unable to open an initial console.\n");
(void) sys_dup(0);
(void) sys_dup(0);
/*
* check if there is an early userspace init. If yes, let it do all
* the work
*/
if (!ramdisk_execute_command)
ramdisk_execute_command = "/init";
if (sys_access((const char __user *) ramdisk_execute_command, 0) != 0) {
ramdisk_execute_command = NULL;
prepare_namespace();
}
/*
* Ok, we have completed the initial bootup, and
* we're essentially up and running. Get rid of the
* initmem segments and start the user-mode stuff..
*/
init_post();
return 0;
}
