Replace ps_oppid (old parent pid) with ps_opptr (a pointer to the old parent process struct).

This simplifies some code and removes the no need to call prfind in
process_untrace().
OK mpi@

4 files changed, 19 insertions, 19 deletions

diff --git a/sys/kern/kern_exit.c b/sys/kern/kern_exit.c
index 874e197389b..dd9a124f78d 100644
--- a/sys/kern/kern_exit.c
+++ b/sys/kern/kern_exit.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: kern_exit.c,v 1.236 2024/10/08 11:57:59 claudio Exp $	*/
+/*	$OpenBSD: kern_exit.c,v 1.237 2024/10/08 12:02:24 claudio Exp $	*/
 /*	$NetBSD: kern_exit.c,v 1.39 1996/04/22 01:38:25 christos Exp $	*/
 
 /*
@@ -325,8 +325,8 @@ exit1(struct proc *p, int xexit, int xsig, int flags)
 		 */
 		while ((qr = LIST_FIRST(&pr->ps_orphans)) != NULL) {
 			mtx_enter(&qr->ps_mtx);
-			KASSERT(qr->ps_oppid == pr->ps_pid);
-			qr->ps_oppid = 0;
+			KASSERT(qr->ps_opptr == pr);
+			qr->ps_opptr = NULL;
 			process_clear_orphan(qr);
 			mtx_leave(&qr->ps_mtx);
 		}
@@ -744,9 +744,9 @@ proc_finish_wait(struct proc *waiter, struct process *pr)
 	 * we need to give it back to the old parent.
 	 */
 	mtx_enter(&pr->ps_mtx);
-	if (pr->ps_oppid != 0 && (pr->ps_oppid != pr->ps_ppid) &&
-	   (tr = prfind(pr->ps_oppid))) {
-		pr->ps_oppid = 0;
+	if (pr->ps_opptr != NULL && (pr->ps_opptr != pr->ps_pptr)) {
+		tr = pr->ps_opptr;
+		pr->ps_opptr = NULL;
 		atomic_clearbits_int(&pr->ps_flags, PS_TRACED);
 		process_reparent(pr, tr);
 		mtx_leave(&pr->ps_mtx);
@@ -774,12 +774,12 @@ process_untrace(struct process *pr)
 	KASSERT(pr->ps_flags & PS_TRACED);
 	MUTEX_ASSERT_LOCKED(&pr->ps_mtx);
 
-	if (pr->ps_oppid != 0 &&
-	    (pr->ps_oppid != pr->ps_ppid))
-		ppr = prfind(pr->ps_oppid);
+	if (pr->ps_opptr != NULL &&
+	    (pr->ps_opptr != pr->ps_pptr))
+		ppr = pr->ps_opptr;
 
 	/* not being traced any more */
-	pr->ps_oppid = 0;
+	pr->ps_opptr = NULL;
 	atomic_clearbits_int(&pr->ps_flags, PS_TRACED);
 	process_reparent(pr, ppr ? ppr : initprocess);
 }
@@ -803,8 +803,8 @@ process_reparent(struct process *child, struct process *parent)
 	if (child->ps_pptr == parent)
 		return;
 
-	KASSERT(child->ps_oppid == 0 ||
-		child->ps_oppid == child->ps_ppid);
+	KASSERT(child->ps_opptr == NULL ||
+		child->ps_opptr == child->ps_pptr);
 
 	LIST_REMOVE(child, ps_sibling);
 	LIST_INSERT_HEAD(&parent->ps_children, child, ps_sibling);
diff --git a/sys/kern/kern_fork.c b/sys/kern/kern_fork.c
index 5be080bf618..ca0d00172e2 100644
--- a/sys/kern/kern_fork.c
+++ b/sys/kern/kern_fork.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: kern_fork.c,v 1.266 2024/10/08 09:05:40 claudio Exp $	*/
+/*	$OpenBSD: kern_fork.c,v 1.267 2024/10/08 12:02:24 claudio Exp $	*/
 /*	$NetBSD: kern_fork.c,v 1.29 1996/02/09 18:59:34 christos Exp $	*/
 
 /*
@@ -459,7 +459,7 @@ fork1(struct proc *curp, int flags, void (*func)(void *), void *arg,
 
 	mtx_enter(&pr->ps_mtx);
 	if (pr->ps_flags & PS_TRACED) {
-		pr->ps_oppid = curpr->ps_pid;
+		pr->ps_opptr = curpr;
 		process_reparent(pr, curpr->ps_pptr);
 
 		/*
diff --git a/sys/kern/sys_process.c b/sys/kern/sys_process.c
index 36c402135ae..6ab263c7eca 100644
--- a/sys/kern/sys_process.c
+++ b/sys/kern/sys_process.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: sys_process.c,v 1.101 2024/10/08 09:05:40 claudio Exp $	*/
+/*	$OpenBSD: sys_process.c,v 1.102 2024/10/08 12:02:24 claudio Exp $	*/
 /*	$NetBSD: sys_process.c,v 1.55 1996/05/15 06:17:47 tls Exp $	*/
 
 /*-
@@ -294,7 +294,7 @@ ptrace_ctrl(struct proc *p, int req, pid_t pid, caddr_t addr, int data)
 			return EBUSY;
 		}
 		atomic_setbits_int(&tr->ps_flags, PS_TRACED);
-		tr->ps_oppid = tr->ps_ppid;
+		tr->ps_opptr = tr->ps_pptr;
 		mtx_leave(&tr->ps_mtx);
 		if (tr->ps_ptstat == NULL)
 			tr->ps_ptstat = malloc(sizeof(*tr->ps_ptstat),
@@ -534,7 +534,7 @@ ptrace_ctrl(struct proc *p, int req, pid_t pid, caddr_t addr, int data)
 		 */
 		mtx_enter(&tr->ps_mtx);
 		atomic_setbits_int(&tr->ps_flags, PS_TRACED);
-		tr->ps_oppid = tr->ps_ppid;
+		tr->ps_opptr = tr->ps_pptr;
 		process_reparent(tr, p->p_p);
 		mtx_leave(&tr->ps_mtx);
 		if (tr->ps_ptstat == NULL)
diff --git a/sys/sys/proc.h b/sys/sys/proc.h
index 86cd44d1946..0a6fee0f87a 100644
--- a/sys/sys/proc.h
+++ b/sys/sys/proc.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: proc.h,v 1.373 2024/10/08 09:05:40 claudio Exp $	*/
+/*	$OpenBSD: proc.h,v 1.374 2024/10/08 12:02:24 claudio Exp $	*/
 /*	$NetBSD: proc.h,v 1.44 1996/04/22 01:23:21 christos Exp $	*/
 
 /*-
@@ -201,9 +201,9 @@ struct process {
 	int	ps_xsig;		/* Stopping or killing signal */
 
 	pid_t	ps_ppid;		/* [K|m] Cached parent pid */
-	pid_t	ps_oppid;	 	/* [K|m] Old parent pid during ptrace */
 	int	ps_ptmask;		/* Ptrace event mask */
 	struct	ptrace_state *ps_ptstat;/* Ptrace state */
+	struct	process *ps_opptr; 	/* [K|m] Old parent during ptrace. */
 
 	struct	rusage *ps_ru;		/* sum of stats for dead threads. */
 	struct	tusage ps_tu;		/* [m] accumul times of dead threads. */