Add dtrace probe infrastructure

include/usdt.h

@@ -0,0 +1,31 @@
+/*
+ * Copyright (c) 2020 Andri Yngvason
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+ * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+ * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+ * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
+ * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#pragma once
+
+#include "config.h"
+
+#ifdef HAVE_USDT
+#include <sys/sdt.h>
+#else
+#define DTRACE_PROBE(...)
+#define DTRACE_PROBE1(...)
+#define DTRACE_PROBE2(...)
+#define DTRACE_PROBE3(...)
+#define DTRACE_PROBE4(...)
+#define DTRACE_PROBE5(...)
+#define DTRACE_PROBE6(...)
+#endif

meson.build

@@ -9,6 +9,7 @@ project(
 )
 
 buildtype = get_option('buildtype')
+host_system = host_machine.system()
 prefix = get_option('prefix')
 
 c_args = [
@@ -88,6 +89,10 @@ config = configuration_data()
 
 config.set('PREFIX', '"' + prefix + '"')
 
+if host_system == 'linux' and cc.has_header('sys/sdt.h')
+	config.set('HAVE_USDT', true)
+endif
+
 configure_file(
 	output: 'config.h',
 	configuration: config,