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diff --git a/lib/libsys/Symbol.sys.map b/lib/libsys/Symbol.sys.map
--- a/lib/libsys/Symbol.sys.map
+++ b/lib/libsys/Symbol.sys.map
@@ -182,6 +182,7 @@
rename;
revoke;
rfork;
+ rfork_thread;
rmdir;
rtprio;
rtprio_thread;
@@ -391,6 +392,7 @@
FBSD_1.9 {
pdrfork;
+ pdrfork_thread;
};
FBSDprivate_1.0 {
diff --git a/lib/libsys/aarch64/Makefile.sys b/lib/libsys/aarch64/Makefile.sys
--- a/lib/libsys/aarch64/Makefile.sys
+++ b/lib/libsys/aarch64/Makefile.sys
@@ -1,6 +1,8 @@
MIASM:= ${MIASM:Nfreebsd[467]_*}
SRCS+= __vdso_gettc.c \
+ pdrfork_thread_gen.c \
+ rfork_thread_gen.c \
sched_getcpu_gen.c
MDASM= cerror.S \
diff --git a/lib/libsys/amd64/Symbol.sys.map b/lib/libsys/amd64/Symbol.sys.map
--- a/lib/libsys/amd64/Symbol.sys.map
+++ b/lib/libsys/amd64/Symbol.sys.map
@@ -1,5 +1,4 @@
FBSD_1.0 {
- rfork_thread;
amd64_get_fsbase;
amd64_get_gsbase;
amd64_set_fsbase;
@@ -17,10 +16,6 @@
amd64_set_tlsbase;
};
-FBSD_1.9 {
- pdrfork_thread;
-};
-
FBSDprivate_1.0 {
_vfork;
};
diff --git a/lib/libsys/arm/Makefile.sys b/lib/libsys/arm/Makefile.sys
--- a/lib/libsys/arm/Makefile.sys
+++ b/lib/libsys/arm/Makefile.sys
@@ -1,4 +1,6 @@
SRCS+= __vdso_gettc.c \
+ pdrfork_thread_gen.c \
+ rfork_thread_gen.c \
sched_getcpu_gen.c
MDASM= \
diff --git a/lib/libsys/i386/Symbol.sys.map b/lib/libsys/i386/Symbol.sys.map
--- a/lib/libsys/i386/Symbol.sys.map
+++ b/lib/libsys/i386/Symbol.sys.map
@@ -10,7 +10,6 @@
i386_set_ldt;
i386_set_watch;
i386_vm86;
- rfork_thread;
};
FBSD_1.6 {
@@ -20,10 +19,6 @@
x86_pkru_unprotect_range;
};
-FBSD_1.9 {
- pdrfork_thread;
-};
-
FBSDprivate_1.0 {
_vfork;
};
diff --git a/lib/libsys/pdrfork_thread_gen.c b/lib/libsys/pdrfork_thread_gen.c
new file mode 100644
--- /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);
+}
diff --git a/lib/libsys/powerpc/Makefile.sys b/lib/libsys/powerpc/Makefile.sys
--- a/lib/libsys/powerpc/Makefile.sys
+++ b/lib/libsys/powerpc/Makefile.sys
@@ -1,4 +1,6 @@
SRCS+= __vdso_gettc.c \
+ pdrfork_thread_gen.c \
+ rfork_thread_gen.c \
sched_getcpu_gen.c
MDASM+= cerror.S
diff --git a/lib/libsys/powerpc64/Makefile.sys b/lib/libsys/powerpc64/Makefile.sys
--- a/lib/libsys/powerpc64/Makefile.sys
+++ b/lib/libsys/powerpc64/Makefile.sys
@@ -1,4 +1,6 @@
SRCS+= __vdso_gettc.c \
+ pdrfork_thread_gen.c \
+ rfork_thread_gen.c \
sched_getcpu_gen.c
MDASM+= cerror.S
diff --git a/lib/libsys/rfork_thread_gen.c b/lib/libsys/rfork_thread_gen.c
new file mode 100644
--- /dev/null
+++ b/lib/libsys/rfork_thread_gen.c
@@ -0,0 +1,40 @@
+/*-
+ * 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 <errno.h>
+#include <unistd.h>
+
+pid_t
+rfork_thread(int flags, void *stack_addr, int (*start_fn)(void *), void *arg)
+{
+ pid_t res;
+ int ret;
+
+ /*
+ * Generic implementation cannot switch stacks. Only
+ * architecture-specific code knows how to do it. Require
+ * that caller knows that, and refuse to do operate if the
+ * stack was supplied.
+ *
+ * Note that implementations that do switch stack, would fault
+ * immediately if the passed stack is NULL. They do not need to
+ * specifically check for the NULL stack value.
+ */
+ if (stack_addr != NULL) {
+ errno = EOPNOTSUPP;
+ return (-1);
+ }
+ res = rfork(flags);
+ if (res == 0) {
+ ret = start_fn(arg);
+ _exit(ret);
+ }
+ return (res);
+}
diff --git a/lib/libsys/riscv/Makefile.sys b/lib/libsys/riscv/Makefile.sys
--- a/lib/libsys/riscv/Makefile.sys
+++ b/lib/libsys/riscv/Makefile.sys
@@ -1,4 +1,6 @@
SRCS+= __vdso_gettc.c \
+ pdrfork_thread_gen.c \
+ rfork_thread_gen.c \
sched_getcpu_gen.c
MDASM= cerror.S \

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