As Eric pointed out, there is no problem with init starting with sid == pgid
== 0, and this was historical linux behavior changed in 2.6.18.
Remove kernel_init()->__set_special_pids().
This change and the previous change in daemonize() mean that /sbin/init does
not need the special "session != 1" hack in sys_setsid() any longer. We can't
remove this check yet, we should cleanup copy_process(CLONE_NEWPID) first, so
update the comment only.
Signed-off-by: Oleg Nesterov <[EMAIL PROTECTED]>
--- PT/init/main.c~4_glob_init 2007-11-26 16:56:24.000000000 +0300
+++ PT/init/main.c 2007-11-27 15:21:56.000000000 +0300
@@ -829,7 +829,6 @@ static int __init kernel_init(void * unu
*/
init_pid_ns.child_reaper = current;
- __set_special_pids(task_pid(current));
cad_pid = task_pid(current);
smp_prepare_cpus(max_cpus);
--- PT/kernel/sys.c~4_glob_init 2007-11-26 17:42:40.000000000 +0300
+++ PT/kernel/sys.c 2007-11-27 16:58:38.000000000 +0300
@@ -1054,12 +1054,11 @@ asmlinkage long sys_setsid(void)
if (group_leader->signal->leader)
goto out;
- /* Fail if a process group id already exists that equals the proposed
- * session id.
+ /* Fail if a process group id already exists that equals the
+ * proposed session id.
*
- * Don't check if session == 1 because kernel threads and CLONE_NEWPID
- * tasks use this session id and so the check will always fail and make
- * it so init cannot successfully call setsid.
+ * Don't check if session == 1, clone(CLONE_NEWPID) creates
+ * this group/session beforehand.
*/
if (session != 1 && pid_task(sid, PIDTYPE_PGID))
goto out;
-
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