new ltt-usertrace

[lttv.git] / ltt-usertrace / sample-printf.c

diff --git a/ltt-usertrace/sample-printf.c b/ltt-usertrace/sample-printf.c
index 85fd6507460fd5d1330de469df2dbb9a2862a68c..9b2292a7ba61e650b52e0cc10b1de03b3b89d6e7 100644 (file)
--- a/ltt-usertrace/sample-printf.c
+++ b/ltt-usertrace/sample-printf.c
@@ -6,11 +6,17 @@
 #define LTT_BLOCKING 1
 #include <ltt/ltt-facility-user_generic.h>
 #include <ltt/ltt-facility-custom-user_generic.h>
+// Notice the inclusion of ltt-facility-custom-user_generic.h for the
+// slow_printf support
 
 
 int main(int argc, char **argv)
 {
        printf("Will trace a printf of an incrementing counter.\n");
+  printf("Abort with CTRL-C.\n");
+  printf("No file is created with this example : it logs through a kernel\n");
+  printf("system call. See the LTTng lttctl command to start tracing.\n");
+
        unsigned int count = 0;
 
        while(1) {