1 files changed, 56 insertions, 0 deletions
diff --git a/src/runtime/env_plan9.go b/src/runtime/env_plan9.go
new file mode 100644
index 000000000..e442c3483
--- /dev/null
+++ b/src/runtime/env_plan9.go
@@ -0,0 +1,56 @@
+// Copyright 2012 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 getenv(s *byte) *byte {
+	val := gogetenv(gostringnocopy(s))
+	if val == "" {
+		return nil
+	}
+	// Strings found in environment are NUL-terminated.
+	return &bytes(val)[0]
+}
+
+var tracebackbuf [128]byte
+
+func gogetenv(key string) string {
+	var file [128]byte
+	if len(key) > len(file)-6 {
+		return ""
+	}
+
+	copy(file[:], "/env/")
+	copy(file[5:], key)
+
+	fd := open(&file[0], _OREAD, 0)
+	if fd < 0 {
+		return ""
+	}
+	n := seek(fd, 0, 2)
+	if n <= 0 {
+		close(fd)
+		return ""
+	}
+
+	p := make([]byte, n)
+
+	r := pread(fd, unsafe.Pointer(&p[0]), int32(n), 0)
+	close(fd)
+	if r < 0 {
+		return ""
+	}
+
+	if p[r-1] == 0 {
+		r--
+	}
+
+	var s string
+	sp := (*_string)(unsafe.Pointer(&s))
+	sp.str = &p[0]
+	sp.len = int(r)
+	return s
+}