Adding upstream version 1.21.8.upstream/1.21.8

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 21 insertions, 0 deletions

diff --git a/src/runtime/mem_plan9.go b/src/runtime/mem_plan9.go
new file mode 100644
index 0000000..9b18a29
--- /dev/null
+++ b/src/runtime/mem_plan9.go
@@ -0,0 +1,21 @@
+// Copyright 2010 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.
+
+package runtime
+
+import "unsafe"
+
+func sbrk(n uintptr) unsafe.Pointer {
+	// Plan 9 sbrk from /sys/src/libc/9sys/sbrk.c
+	bl := bloc
+	n = memRound(n)
+	if bl+n > blocMax {
+		if brk_(unsafe.Pointer(bl+n)) < 0 {
+			return nil
+		}
+		blocMax = bl + n
+	}
+	bloc += n
+	return unsafe.Pointer(bl)
+}