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diff --git a/sys/compat/linux/linux_dummy.c b/sys/compat/linux/linux_dummy.c
--- a/sys/compat/linux/linux_dummy.c
+++ b/sys/compat/linux/linux_dummy.c
@@ -135,7 +135,6 @@
DUMMY(fsmount);
DUMMY(fspick);
DUMMY(pidfd_open);
-DUMMY(close_range);
DUMMY(openat2);
DUMMY(pidfd_getfd);
DUMMY(process_madvise);
diff --git a/sys/compat/linux/linux_file.h b/sys/compat/linux/linux_file.h
--- a/sys/compat/linux/linux_file.h
+++ b/sys/compat/linux/linux_file.h
@@ -197,4 +197,11 @@
unsigned char f_handle[0];
};
+/*
+ * Look at linux_close_range() for an explanation.
+ *
+ * #define LINUX_CLOSE_RANGE_UNSHARE (1U << 1)
+ */
+#define LINUX_CLOSE_RANGE_CLOEXEC (1U << 2)
+
#endif /* !_LINUX_FILE_H_ */
diff --git a/sys/compat/linux/linux_file.c b/sys/compat/linux/linux_file.c
--- a/sys/compat/linux/linux_file.c
+++ b/sys/compat/linux/linux_file.c
@@ -2083,3 +2083,29 @@
*/
return (EINVAL);
}
+
+int
+linux_close_range(struct thread *td, struct linux_close_range_args *args)
+{
+ u_int flags = 0;
+
+ /*
+ * Implementing close_range(CLOSE_RANGE_UNSHARE) allows Linux to
+ * unshare filedesc table of the calling thread from others threads
+ * in a thread group (i.e., process in the FreeBSD) or others processes,
+ * which shares the same table, before closing the files. FreeBSD does
+ * not have compatible unsharing mechanism due to the fact that sharing
+ * process resources, including filedesc table, is at thread level in the
+ * Linux, while in the FreeBSD it is at the process level.
+ * Return EINVAL for now if the CLOSE_RANGE_UNSHARE flag is specified
+ * until this new Linux API stabilizes.
+ */
+
+ if ((args->flags & ~(LINUX_CLOSE_RANGE_CLOEXEC)) != 0)
+ return (EINVAL);
+ if (args->first > args->last)
+ return (EINVAL);
+ if ((args->flags & LINUX_CLOSE_RANGE_CLOEXEC) != 0)
+ flags |= CLOSE_RANGE_CLOEXEC;
+ return (kern_close_range(td, flags, args->first, args->last));
+}

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