1 files changed, 19 insertions, 0 deletions
diff --git a/src/runtime/os_unix.go b/src/runtime/os_unix.go
new file mode 100644
index 0000000..fdbeba7
--- /dev/null
+++ b/src/runtime/os_unix.go
@@ -0,0 +1,19 @@
+// Copyright 2023 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build unix
+
+package runtime
+
+const (
+	// These values are the same on all known Unix systems.
+	// If we find a discrepancy some day, we can split them out.
+	_F_SETFD    = 2
+	_FD_CLOEXEC = 1
+)
+
+//go:nosplit
+func closeonexec(fd int32) {
+	fcntl(fd, _F_SETFD, _FD_CLOEXEC)
+}