From f52da1cac583c31a7f0ca5530466dce2bede598e Mon Sep 17 00:00:00 2001
From: Luke Shumaker <lukeshu@sbcglobal.net>
Date: Tue, 25 Aug 2015 14:19:33 -0600
Subject: initial commit

---
 sd-daemon/listen_fds.go    | 51 ++++++++++++++++++++++++++++++++++++++++++++++
 sd-daemon/logger/logger.go | 20 ++++++++++++++++++
 2 files changed, 71 insertions(+)
 create mode 100644 sd-daemon/listen_fds.go
 create mode 100644 sd-daemon/logger/logger.go

diff --git a/sd-daemon/listen_fds.go b/sd-daemon/listen_fds.go
new file mode 100644
index 0000000..c90d373
--- /dev/null
+++ b/sd-daemon/listen_fds.go
@@ -0,0 +1,51 @@
+// Copyright 2015 CoreOS, Inc.
+// Copyright 2015 Luke Shumaker
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package activation implements primitives for systemd socket activation.
+package listen
+
+import (
+	"os"
+	"strconv"
+	"syscall"
+)
+
+//#include <systemd/sd-daemon.h>
+import "C"
+
+func ListenFds(unsetEnv bool) []*os.File {
+	if unsetEnv {
+		defer os.Unsetenv("LISTEN_PID")
+		defer os.Unsetenv("LISTEN_FDS")
+	}
+
+	pid, err := strconv.Atoi(os.Getenv("LISTEN_PID"))
+	if err != nil || pid != os.Getpid() {
+		return nil
+	}
+
+	nfds, err := strconv.Atoi(os.Getenv("LISTEN_FDS"))
+	if err != nil || nfds == 0 {
+		return nil
+	}
+
+	files := make([]*os.File, 0, nfds)
+	for fd := C.SD_LISTEN_FDS_START; fd < C.SD_LISTEN_FDS_START+nfds; fd++ {
+		syscall.CloseOnExec(fd)
+		files = append(files, os.NewFile(uintptr(fd), "LISTEN_FD_"+strconv.Itoa(fd)))
+	}
+
+	return files
+}
diff --git a/sd-daemon/logger/logger.go b/sd-daemon/logger/logger.go
new file mode 100644
index 0000000..cfabe9f
--- /dev/null
+++ b/sd-daemon/logger/logger.go
@@ -0,0 +1,20 @@
+package logger
+
+import ("fmt"; "os")
+
+//#include <systemd/sd-daemon.h>
+import "C"
+
+func log(level string, format string, a ...interface{}) {
+        f := level + format + "\n";
+        fmt.Fprintf(os.Stderr, f, a);
+}
+                
+/* system is unusable               */ func Emerg(  format string, a ...interface{}) { log(C.SD_EMERG  , format, a); }
+/* action must be taken immediately */ func Alert(  format string, a ...interface{}) { log(C.SD_ALERT  , format, a); }
+/* critical conditions              */ func Crit(   format string, a ...interface{}) { log(C.SD_CRIT   , format, a); }
+/* error conditions                 */ func Err(    format string, a ...interface{}) { log(C.SD_ERR    , format, a); }
+/* warning conditions               */ func Warning(format string, a ...interface{}) { log(C.SD_WARNING, format, a); }
+/* normal but significant condition */ func Notice( format string, a ...interface{}) { log(C.SD_NOTICE , format, a); }
+/* informational                    */ func Info(   format string, a ...interface{}) { log(C.SD_INFO   , format, a); }
+/* debug-level messages             */ func Debug(  format string, a ...interface{}) { log(C.SD_DEBUG  , format, a); }
-- 
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