usyslogd: create abstraction for log stream management

This commit seperates the formating and printing of log messages to files
more cleanly from the message pump that retrieves the log messages.

At a later point, other backends could be added more easiyl (e.g. forward
the log message to some server).

Signed-off-by: David Oberhollenzer <david.oberhollenzer@tele2.at>

1 files changed, 35 insertions, 0 deletions

diff --git a/syslogd/backend.h b/syslogd/backend.h
new file mode 100644
index 0000000..9f26a54
--- /dev/null
+++ b/syslogd/backend.h
@@ -0,0 +1,35 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * Copyright (C) 2018 - David Oberhollenzer
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+#ifndef LOGFILE_H
+#define LOGFILE_H
+
+#include "proto.h"
+
+typedef struct log_backend_t {
+	int (*init)(struct log_backend_t *log);
+
+	void (*cleanup)(struct log_backend_t *log);
+
+	int (*write)(struct log_backend_t *log, const syslog_msg_t *msg);
+} log_backend_t;
+
+
+extern log_backend_t *logmgr;
+
+
+#endif /* LOGFILE_H */