On top of add-process_session-helper-routine.patch
All members of the process group have the same sid and it can't be == 0.
NOTE: this code (and a similar one in sys_setpgid) was needed because it
was possibe to have ->session == 0. It's not possible any longer since
[PATCH] pidhash: don't use zero pids
Commit: c7c6464117a02b0d54feb4ebeca4db70fa493678
Signed-off-by: Oleg Nesterov <[email protected]>
--- rc2-mm2/kernel/exit.c~ 2006-10-24 20:39:31.000000000 +0400
+++ rc2-mm2/kernel/exit.c 2006-10-24 20:46:14.000000000 +0400
@@ -188,21 +188,18 @@ repeat:
int session_of_pgrp(int pgrp)
{
struct task_struct *p;
- int sid = -1;
+ int sid = 0;
read_lock(&tasklist_lock);
- do_each_task_pid(pgrp, PIDTYPE_PGID, p) {
- if (process_session(p) > 0) {
- sid = process_session(p);
- goto out;
- }
- } while_each_task_pid(pgrp, PIDTYPE_PGID, p);
- p = find_task_by_pid(pgrp);
- if (p)
+
+ p = find_task_by_pid_type(PIDTYPE_PGID, pgrp);
+ if (p == NULL)
+ p = find_task_by_pid(pgrp);
+ if (p != NULL)
sid = process_session(p);
-out:
+
read_unlock(&tasklist_lock);
-
+
return sid;
}
-
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