log/syslog: Restore interface to make this work on Solaris again.

From-SVN: r201188

libgo/go/log/syslog/syslog.go

@@ -88,6 +88,15 @@ type Writer struct {
 	raddr    string
 
 	mu   sync.Mutex // guards conn
+	conn serverConn
+}
+
+type serverConn interface {
+	writeString(p Priority, hostname, tag, s, nl string) error
+	close() error
+}
+
+type netConn struct {
 	conn net.Conn
 }
 
@@ -135,7 +144,7 @@ func Dial(network, raddr string, priority Priority, tag string) (*Writer, error)
 func (w *Writer) connect() (err error) {
 	if w.conn != nil {
 		// ignore err from close, it makes sense to continue anyway
-		w.conn.Close()
+		w.conn.close()
 		w.conn = nil
 	}
 
@@ -148,7 +157,7 @@ func (w *Writer) connect() (err error) {
 		var c net.Conn
 		c, err = net.Dial(w.network, w.raddr)
 		if err == nil {
-			w.conn = c
+			w.conn = netConn{c}
 			if w.hostname == "" {
 				w.hostname = c.LocalAddr().String()
 			}
@@ -168,7 +177,7 @@ func (w *Writer) Close() error {
 	defer w.mu.Unlock()
 
 	if w.conn != nil {
-		err := w.conn.Close()
+		err := w.conn.close()
 		w.conn = nil
 		return err
 	}
@@ -257,13 +266,22 @@ func (w *Writer) write(p Priority, msg string) (int, error) {
 		nl = "\n"
 	}
 
-	timestamp := time.Now().Format(time.RFC3339)
-	fmt.Fprintf(w.conn, "<%d>%s %s %s[%d]: %s%s",
-		p, timestamp, w.hostname,
-		w.tag, os.Getpid(), msg, nl)
+	w.conn.writeString(p, w.hostname, w.tag, msg, nl)
 	return len(msg), nil
 }
 
+func (n netConn) writeString(p Priority, hostname, tag, msg, nl string) error {
+	timestamp := time.Now().Format(time.RFC3339)
+	_, err := fmt.Fprintf(n.conn, "<%d>%s %s %s[%d]: %s%s",
+		p, timestamp, hostname,
+		tag, os.Getpid(), msg, nl)
+	return err
+}
+
+func (n netConn) close() error {
+	return n.conn.Close()
+}
+
 // NewLogger creates a log.Logger whose output is written to
 // the system log service with the specified priority. The logFlag
 // argument is the flag set passed through to log.New to create

libgo/go/log/syslog/syslog_libc.go

@@ -23,17 +23,17 @@ type libcConn int
 
 func syslog_c(int, *byte)
 
-func (libcConn) writeString(p Priority, hostname, tag, msg string) (int, error) {
+func (libcConn) writeString(p Priority, hostname, tag, msg, nl string) error {
 	timestamp := time.Now().Format(time.RFC3339)
-	log := fmt.Sprintf("%s %s %s[%d]: %s", timestamp, hostname, tag, os.Getpid(), msg)
+	log := fmt.Sprintf("%s %s %s[%d]: %s%s", timestamp, hostname, tag, os.Getpid(), msg, nl)
 	buf, err := syscall.BytePtrFromString(log)
 	if err != nil {
-		return 0, err
+		return err
 	}
 	syscall.Entersyscall()
 	syslog_c(int(p), buf)
 	syscall.Exitsyscall()
-	return len(msg), nil
+	return nil
 }
 
 func (libcConn) close() error {

libgo/go/log/syslog/syslog_unix.go

@@ -14,7 +14,7 @@ import (
 // unixSyslog opens a connection to the syslog daemon running on the
 // local machine using a Unix domain socket.
 
-func unixSyslog() (conn net.Conn, err error) {
+func unixSyslog() (conn serverConn, err error) {
 	logTypes := []string{"unixgram", "unix"}
 	logPaths := []string{"/dev/log", "/var/run/syslog"}
 	for _, network := range logTypes {
@@ -23,7 +23,7 @@ func unixSyslog() (conn net.Conn, err error) {
 			if err != nil {
 				continue
 			} else {
-				return conn, nil
+				return netConn{conn}, nil
 			}
 		}
 	}