./bin/zabbix_sender -z 127.0.0.1 -p 10052 -s "test server" -k "trap1" -o 0
zabbix_sender [13456]: cannot open log: unknown log type

	if (SUCCEED != zabbix_open_log(LOG_TYPE_UNDEFINED, CONFIG_LOG_LEVEL, NULL, &error))
	{
		zbx_error("cannot open log: %s", error);
		zbx_free(error);
		exit(EXIT_FAILURE);
	}

-int	zabbix_open_log(int type, int level, const char *filename)
+int	zabbix_open_log(int type, int level, const char *filename, char **error)
 {
-	FILE	*log_file = NULL;
-#ifdef _WINDOWS
-	wchar_t	*wevent_source;
-#endif
 	log_type = type;
 	log_level = level;
 
@@ -281,6 +274,8 @@
 	if (LOG_TYPE_SYSTEM == type)
 	{
 #ifdef _WINDOWS
+		wchar_t	*wevent_source;
+
 		wevent_source = zbx_utf8_to_unicode(ZABBIX_EVENT_SOURCE);
 		system_log_handle = RegisterEventSource(NULL, wevent_source);
 		zbx_free(wevent_source);
@@ -290,22 +285,21 @@
 	}
 	else if (LOG_TYPE_FILE == type)
 	{
+		FILE	*log_file = NULL;
+
 		if (MAX_STRING_LEN <= strlen(filename))
 		{
-			zbx_error("too long path for logfile");
-			exit(EXIT_FAILURE);
+			*error = zbx_strdup(*error, "too long path for logfile");
+			return FAIL;
 		}
 
-		if (FAIL == zbx_mutex_create_force(&log_access, ZBX_MUTEX_LOG))
-		{
-			zbx_error("unable to create mutex for log file");
-			exit(EXIT_FAILURE);
-		}
+		if (SUCCEED != zbx_mutex_create(&log_access, ZBX_MUTEX_LOG, error))
+			return FAIL;
 
 		if (NULL == (log_file = fopen(filename, "a+")))
 		{
-			zbx_error("unable to open log file [%s]: %s", filename, zbx_strerror(errno));
-			exit(EXIT_FAILURE);
+			*error = zbx_dsprintf(*error, "unable to open log file [%s]: %s", filename, zbx_strerror(errno));
+			return FAIL;
 		}
 
 		strscpy(log_filename, filename);
@@ -313,10 +307,10 @@
 	}
 	else if (LOG_TYPE_CONSOLE == type)
 	{
-		if (FAIL == zbx_mutex_create_force(&log_access, ZBX_MUTEX_LOG))
+		if (SUCCEED != zbx_mutex_create(&log_access, ZBX_MUTEX_LOG, error))
 		{
-			zbx_error("unable to create mutex for standard output");
-			exit(EXIT_FAILURE);
+			*error = zbx_strdup(*error, "unable to create mutex for standard output");
+			return FAIL;
 		}
 
 		fflush(stderr);
@@ -323,6 +317,11 @@
 		if (-1 == dup2(STDOUT_FILENO, STDERR_FILENO))
 			zbx_error("cannot redirect stderr to stdout: %s", zbx_strerror(errno));
 	}
+	else
+	{
+		*error = zbx_strdup(*error, "unknown log type");
+		return FAIL;
+	}
 
 	return SUCCEED;
 }
@@ -344,11 +343,6 @@
 	}
 }