MFC r269656:

Implement and use proc_realparent(9).

MFC r270024 (by markj):
Correct the order of arguments passed to LIST_INSERT_AFTER().

For merge, the p_treeflag member of struct proc was moved to the end
of the structure, to keep KBI intact.

1 files changed, 8 insertions, 1 deletions

diff --git a/sys/sys/proc.h b/sys/sys/proc.h
index 2932114..3d2e9e5 100644
--- a/sys/sys/proc.h
+++ b/sys/sys/proc.h
@@ -591,6 +591,7 @@ struct proc {
 	 */
 	LIST_ENTRY(proc) p_orphan;	/* (e) List of orphan processes. */
 	LIST_HEAD(, proc) p_orphans;	/* (e) Pointer to list of orphans. */
+	u_int		p_treeflag;	/* (e) P_TREE flags */
 };
 
 #define	p_session	p_pgrp->pg_session
@@ -628,7 +629,7 @@ struct proc {
 #define	P_SINGLE_BOUNDARY 0x400000 /* Threads should suspend at user boundary. */
 #define	P_HWPMC		0x800000 /* Process is using HWPMCs */
 #define	P_JAILED	0x1000000 /* Process is in jail. */
-#define	P_ORPHAN	0x2000000 /* Orphaned. */
+#define	P_UNUSED1	0x2000000
 #define	P_INEXEC	0x4000000 /* Process is in execve(). */
 #define	P_STATCHILD	0x8000000 /* Child process stopped or exited. */
 #define	P_INMEM		0x10000000 /* Loaded into memory. */
@@ -643,6 +644,11 @@ struct proc {
 /* These flags are kept in p_flag2. */
 #define	P2_INHERIT_PROTECTED 0x00000001 /* New children get P_PROTECTED. */
 
+/* Flags protected by proctree_lock, kept in p_treeflags. */
+#define	P_TREE_ORPHANED		0x00000001	/* Reparented, on orphan list */
+#define	P_TREE_FIRST_ORPHAN	0x00000002	/* First element of orphan
+						   list */
+
 /*
  * These were process status values (p_stat), now they are only used in
  * legacy conversion code.
@@ -883,6 +889,7 @@ int	proc_getenvv(struct thread *td, struct proc *p, struct sbuf *sb);
 void	procinit(void);
 void	proc_linkup0(struct proc *p, struct thread *td);
 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);
 struct	pstats *pstats_alloc(void);