svn commit: r350611 - in head/sys: kern sys

[Mariusz Zaborski]

Author: oshogbo
Date: Mon Aug  5 20:11:57 2019
New Revision: 350611
URL: https://svnweb.freebsd.org/changeset/base/350611

Log:
  proc: introduce the proc_add_orphan function
  
  This API allows adding the process to its parent orphan list.
  
  Reviewed by:	kib, markj
  MFC after:	1 month

Modified:
  head/sys/kern/kern_exit.c
  head/sys/sys/proc.h

Modified: head/sys/kern/kern_exit.c
==============================================================================
--- head/sys/kern/kern_exit.c	Mon Aug  5 19:59:23 2019	(r350610)
+++ head/sys/kern/kern_exit.c	Mon Aug  5 20:11:57 2019	(r350611)
@@ -1355,6 +1355,24 @@ loop_locked:
 	goto loop;
 }
 
+void
+proc_add_orphan(struct proc *child, struct proc *parent)
+{
+
+	sx_assert(&proctree_lock, SX_XLOCKED);
+	KASSERT((child->p_flag & P_TRACED) != 0,
+	    ("proc_add_orphan: not traced"));
+
+	if (LIST_EMPTY(&parent->p_orphans)) {
+		child->p_treeflag |= P_TREE_FIRST_ORPHAN;
+		LIST_INSERT_HEAD(&parent->p_orphans, child, p_orphan);
+	} else {
+		LIST_INSERT_AFTER(LIST_FIRST(&parent->p_orphans),
+		    child, p_orphan);
+	}
+	child->p_treeflag |= P_TREE_ORPHANED;
+}
+
 /*
  * Make process 'parent' the new parent of process 'child'.
  * Must be called with an exclusive hold of proctree lock.
@@ -1375,16 +1393,8 @@ proc_reparent(struct proc *child, struct proc *parent,
 	LIST_INSERT_HEAD(&parent->p_children, child, p_sibling);
 
 	proc_clear_orphan(child);
-	if (child->p_flag & P_TRACED) {
-		if (LIST_EMPTY(&child->p_pptr->p_orphans)) {
-			child->p_treeflag |= P_TREE_FIRST_ORPHAN;
-			LIST_INSERT_HEAD(&child->p_pptr->p_orphans, child,
-			    p_orphan);
-		} else {
-			LIST_INSERT_AFTER(LIST_FIRST(&child->p_pptr->p_orphans),
-			    child, p_orphan);
-		}
-		child->p_treeflag |= P_TREE_ORPHANED;
+	if ((child->p_flag & P_TRACED) != 0) {
+		proc_add_orphan(child, child->p_pptr);
 	}
 
 	child->p_pptr = parent;

Modified: head/sys/sys/proc.h
==============================================================================
--- head/sys/sys/proc.h	Mon Aug  5 19:59:23 2019	(r350610)
+++ head/sys/sys/proc.h	Mon Aug  5 20:11:57 2019	(r350611)
@@ -1069,6 +1069,7 @@ void	proc_linkup(struct proc *p, struct thread *td);
 struct proc *proc_realparent(struct proc *child);
 void	proc_reap(struct thread *td, struct proc *p, int *status, int options);
 void	proc_reparent(struct proc *child, struct proc *newparent, bool set_oppid);
+void	proc_add_orphan(struct proc *child, struct proc *parent);
 void	proc_set_traced(struct proc *p, bool stop);
 void	proc_wkilled(struct proc *p);
 struct	pstats *pstats_alloc(void);