Optional arguments for syslog_logger factory.

include/spdlog/common.h

@@ -27,13 +27,42 @@
 #include<initializer_list>
 #include<chrono>
 
+#ifdef __linux__
+
+#define SYSLOG_NAMES 1
+#include <syslog.h>
+#endif
+
 namespace spdlog
 {
+
 class formatter;
+
 namespace sinks
 {
+
 class sink;
+
+#ifdef __linux__
+namespace syslog
+{
+namespace option
+{
+typedef enum
+{
+    CONS     = LOG_CONS,
+    NDELAY   = LOG_NDELAY,
+    NOWAIT   = LOG_NOWAIT,
+    ODELAY   = LOG_ODELAY,
+    PERROR   = LOG_PERROR,
+    PID      = LOG_PID
+} option_enum;
 }
+}
+#endif
+
+}
+
 
 // Common types across the lib
 using log_clock = std::chrono::system_clock;