Add a facility for non-init process to declare itself the reaper of

the orphaned descendants.  Base of the API is modelled after the same
feature from the DragonFlyBSD.

Requested by:	bapt
Reviewed by:	jilles (previous version)
Tested by:	pho
Sponsored by:	The FreeBSD Foundation
MFC after:	3 weeks

2 files changed, 53 insertions, 4 deletions

diff --git a/sys/compat/freebsd32/freebsd32.h b/sys/compat/freebsd32/freebsd32.h
index af10055..ed3df7a 100644
--- a/sys/compat/freebsd32/freebsd32.h
+++ b/sys/compat/freebsd32/freebsd32.h
@@ -390,4 +390,10 @@ struct kld32_file_stat {
 	char	pathname[MAXPATHLEN];
 };
 
+struct procctl_reaper_pids32 {
+	u_int	rp_count;
+	u_int	rp_pad0[15];
+	uint32_t rp_pids;
+};
+
 #endif /* !_COMPAT_FREEBSD32_FREEBSD32_H_ */
diff --git a/sys/compat/freebsd32/freebsd32_misc.c b/sys/compat/freebsd32/freebsd32_misc.c
index 24c5738..1457f57 100644
--- a/sys/compat/freebsd32/freebsd32_misc.c
+++ b/sys/compat/freebsd32/freebsd32_misc.c
@@ -2957,20 +2957,63 @@ int
 freebsd32_procctl(struct thread *td, struct freebsd32_procctl_args *uap)
 {
 	void *data;
-	int error, flags;
+	union {
+		struct procctl_reaper_status rs;
+		struct procctl_reaper_pids rp;
+		struct procctl_reaper_kill rk;
+	} x;
+	union {
+		struct procctl_reaper_pids32 rp;
+	} x32;
+	int error, error1, flags;
 
 	switch (uap->com) {
 	case PROC_SPROTECT:
 		error = copyin(PTRIN(uap->data), &flags, sizeof(flags));
-		if (error)
+		if (error != 0)
 			return (error);
 		data = &flags;
 		break;
+	case PROC_REAP_ACQUIRE:
+	case PROC_REAP_RELEASE:
+		if (uap->data != NULL)
+			return (EINVAL);
+		data = NULL;
+		break;
+	case PROC_REAP_STATUS:
+		data = &x.rs;
+		break;
+	case PROC_REAP_GETPIDS:
+		error = copyin(uap->data, &x32.rp, sizeof(x32.rp));
+		if (error != 0)
+			return (error);
+		CP(x32.rp, x.rp, rp_count);
+		PTRIN_CP(x32.rp, x.rp, rp_pids);
+		data = &x.rp;
+		break;
+	case PROC_REAP_KILL:
+		error = copyin(uap->data, &x.rk, sizeof(x.rk));
+		if (error != 0)
+			return (error);
+		data = &x.rk;
+		break;
 	default:
 		return (EINVAL);
 	}
-	return (kern_procctl(td, uap->idtype, PAIR32TO64(id_t, uap->id),
-	    uap->com, data));
+	error = kern_procctl(td, uap->idtype, PAIR32TO64(id_t, uap->id),
+	    uap->com, data);
+	switch (uap->com) {
+	case PROC_REAP_STATUS:
+		if (error == 0)
+			error = copyout(&x.rs, uap->data, sizeof(x.rs));
+		break;
+	case PROC_REAP_KILL:
+		error1 = copyout(&x.rk, uap->data, sizeof(x.rk));
+		if (error == 0)
+			error = error1;
+		break;
+	}
+	return (error);
 }
 
 int