Add log message support

include/gmrf/gmrf.h

@@ -31,6 +31,7 @@
 #include <stddef.h>
 #include <stdint.h>
 #include <string.h>
+#include <syslog.h>
 
 
 typedef struct gmrf gmrf_t;
@@ -52,6 +53,7 @@ static inline bool gmrf_addr_equal(const gmrf_addr_t *addr1, const gmrf_addr_t *
 	return (memcmp(addr1->d, addr2->d, GMRF_ADDR_LEN) == 0);
 }
 
+void gmrf_logf(gmrf_t *gmrf, int priority, const char *format, ...);
 
 gmrf_addr_t gmrf_iface_get_addr(gmrf_t *gmrf, gmrf_iface_t *iface);
 size_t gmrf_iface_get_mtu(gmrf_t *gmrf, gmrf_iface_t *iface);

mmss/CMakeLists.txt

@@ -2,6 +2,7 @@ include_directories(${GMRF_SOURCE_DIR}/include)
 
 add_executable(mmss
   iface.c
+  log.c
   mmss.c
   protocol.c
   queue.c

mmss/log.c

@@ -0,0 +1,73 @@
+/*
+  Copyright (c) 2013, Matthias Schiffer <mschiffer@universe-factory.net>
+  All rights reserved.
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions are met:
+
+    1. Redistributions of source code must retain the above copyright notice,
+       this list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright notice,
+       this list of conditions and the following disclaimer in the documentation
+       and/or other materials provided with the distribution.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+
+#include "mmss.h"
+
+#include <stdio.h>
+
+
+static inline int snprintf_safe(char *buffer, size_t size, const char *format, ...) {
+	va_list ap;
+	va_start(ap, format);
+	int ret = vsnprintf(buffer, size, format, ap);
+	va_end(ap);
+
+	return ret < 0 ? 0 : ret > size ? size : ret;
+}
+
+static inline const char* get_log_prefix(int log_level) {
+	switch(log_level) {
+	case LOG_CRIT:
+		return "Fatal: ";
+	case LOG_ERR:
+		return "Error: ";
+	case LOG_WARNING:
+		return "Warning: ";
+	case LOG_NOTICE:
+		return "Info: ";
+	case LOG_INFO:
+		return "Verbose: ";
+	case LOG_DEBUG:
+		return "DEBUG: ";
+	default:
+		return "";
+	}
+}
+
+
+void gmrf_logf(gmrf_t *gmrf, int priority, const char *format, ...) {
+	char buf[1024];
+	size_t pos = 0;
+
+	pos += snprintf_safe(buf, sizeof(buf), "[% 5u.%03u] %s: %s", gmrf->mmss->now/1000, gmrf->mmss->now%1000, gmrf->name, get_log_prefix(priority));
+
+        va_list ap;
+        va_start(ap, format);
+	vsnprintf(buf+pos, sizeof(buf)-pos, format, ap);
+	va_end(ap);
+
+	fprintf(stderr, "%s\n", buf);
+}

mmss/mmss.c

@@ -67,7 +67,7 @@ int main(int argc, char *argv[]) {
 	mmss_t mmss = { .now = 0 };
 
 	mmss_network_t net = { .mtu = 1500 };
-	gmrf_t node1 = { .mmss = &mmss, .proto = proto }, node2 = { .mmss = &mmss, .proto = proto };
+	gmrf_t node1 = { .name = "node1", .mmss = &mmss, .proto = proto }, node2 = { .name = "node2", .mmss = &mmss, .proto = proto };
 	gmrf_iface_t iface1 = {}, iface2 = {};
 
 	iface1.net = &net;
@@ -93,7 +93,7 @@ int main(int argc, char *argv[]) {
 		int timeout = get_queue_timeout(&mmss);
 
 		if (timeout < 0) {
-			fprintf(stderr, "Nothing queued, deadlock occured.\n");
+			fprintf(stderr, "nothing queued, deadlock occured.\n");
 			break;
 		}
 

mmss/mmss.h

@@ -67,6 +67,8 @@ struct mmss_scheduled {
 struct gmrf {
 	gmrf_t *next;
 
+	const char *name;
+
 	mmss_t *mmss;
 	gmrf_context_t *ctx;
 	gmrf_iface_t *interfaces;

mmss/protocol.c

@@ -45,5 +45,7 @@ const mmss_protocol_t* mmss_load_protocol(const char *module) {
 		return NULL;
 	}
 
+	fprintf(stderr, "loaded protocol `%s' version %s\n", proto->get_name(), proto->get_version());
+
 	return proto;
 }