Commit e19f247a authored by Oren Laadan's avatar Oren Laadan Committed by Linus Torvalds
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[PATCH] setpgid: should work for sub-threads



setsid() does not work unless the calling process is a
thread_group_leader().

'man setpgid' does not tell anything about that, so I consider this
behaviour is a bug.
Signed-off-by: default avatarOren Laadan <orenl@cs.columbia.edu>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Roland McGrath <roland@redhat.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent ee0acf90
......@@ -257,7 +257,7 @@ static inline void reparent_to_init(void)
void __set_special_pids(pid_t session, pid_t pgrp)
{
struct task_struct *curr = current;
struct task_struct *curr = current->group_leader;
if (curr->signal->session != session) {
detach_pid(curr, PIDTYPE_SID);
......
......@@ -1215,24 +1215,22 @@ asmlinkage long sys_getsid(pid_t pid)
asmlinkage long sys_setsid(void)
{
struct task_struct *group_leader = current->group_leader;
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);
pid = find_pid(PIDTYPE_PGID, group_leader->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);
group_leader->signal->leader = 1;
__set_special_pids(group_leader->pid, group_leader->pid);
group_leader->signal->tty = NULL;
group_leader->signal->tty_old_pgrp = 0;
err = process_group(group_leader);
out:
write_unlock_irq(&tasklist_lock);
up(&tty_sem);
......
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