[PATCH v2 8/9] trace-cmd: Override tracecmd_debug() to show thread id

[Steven Rostedt <rostedt@xxxxxxxxxxx>]

From: "Steven Rostedt (Google)" <rostedt@xxxxxxxxxxx>

To differentiate threads, have tracecmd_debug() show the thread id of
the debug prints.

Signed-off-by: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx>
---
 tracecmd/trace-cmd.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/tracecmd/trace-cmd.c b/tracecmd/trace-cmd.c
index a83a8d0bb9e4..3f3e69a7f1e2 100644
--- a/tracecmd/trace-cmd.c
+++ b/tracecmd/trace-cmd.c
@@ -10,12 +10,17 @@
 #include <dirent.h>
 #include <errno.h>
 #include <stdlib.h>
+#include <sys/syscall.h>
 
 #include "trace-local.h"
 
 int silence_warnings;
 int show_status;
 
+#ifndef gettid
+#define gettid() syscall(__NR_gettid)
+#endif
+
 void warning(const char *fmt, ...)
 {
 	va_list ap;
@@ -45,6 +50,19 @@ void *malloc_or_die(unsigned int size)
 	return data;
 }
 
+void tracecmd_debug(const char *fmt, ...)
+{
+	va_list ap;
+
+	if (!tracecmd_get_debug())
+		return;
+
+	va_start(ap, fmt);
+	printf("[%d] ", (int)gettid());
+	vprintf(fmt, ap);
+	va_end(ap);
+}
+
 static struct trace_log_severity {
 	int		id;
 	const char	*name;
-- 
2.35.1