1 files changed, 34 insertions, 0 deletions
diff --git a/lib/libsys/pdrfork_thread_gen.c b/lib/libsys/pdrfork_thread_gen.c
new file mode 100644
index 000000000000..d36b2cc11993
--- /dev/null
+++ b/lib/libsys/pdrfork_thread_gen.c
@@ -0,0 +1,34 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright 2026 The FreeBSD Foundation
+ *
+ * This software were developed by
+ * Konstantin Belousov <kib@FreeBSD.org> under sponsorship from
+ * the FreeBSD Foundation.
+ */
+
+#include <sys/types.h>
+#include <sys/procdesc.h>
+#include <errno.h>
+#include <unistd.h>
+
+pid_t
+pdrfork_thread(int *fdp, int pdflags, int rfflags, void *stack_addr,
+    int (*start_fn)(void *), void *arg)
+{
+	pid_t res;
+	int ret;
+
+	/* See comment in rfork_thread_gen.c. */
+	if (stack_addr != NULL) {
+		errno = EOPNOTSUPP;
+		return (-1);
+	}
+	res = pdrfork(fdp, pdflags, rfflags);
+	if (res == 0) {
+		ret = start_fn(arg);
+		_exit(ret);
+	}
+	return (res);
+}