Tests: fix racy UST snapshot post mortem test

[lttng-tools.git] / tests / utils / testapp / gen-ust-events / gen-ust-events.c

diff --git a/tests/utils/testapp/gen-ust-events/gen-ust-events.c b/tests/utils/testapp/gen-ust-events/gen-ust-events.c
index edf40eee42a1c3dcbf224adb2f08e0720a6040d4..5f1e5bdd4e1dec155399fbb38c418ef82f54752d 100644 (file)
--- a/tests/utils/testapp/gen-ust-events/gen-ust-events.c
+++ b/tests/utils/testapp/gen-ust-events/gen-ust-events.c
@@ -15,7 +15,9 @@
  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
  */
 
+#include <assert.h>
 #include <arpa/inet.h>
+#include <fcntl.h>
 #include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -28,6 +30,21 @@
 #define TRACEPOINT_DEFINE
 #include "tp.h"
 
+void create_file(const char *path)
+{
+       int ret;
+
+       assert(path);
+
+       ret = creat(path, S_IRWXU);
+       if (ret < 0) {
+               fprintf(stderr, "Failed to create file %s\n", path);
+               return;
+       }
+
+       (void) close(ret);
+}
+
 int main(int argc, char **argv)
 {
        int i, netint;
@@ -37,6 +54,7 @@ int main(int argc, char **argv)
        float flt = 2222.0;
        unsigned int nr_iter = 100;
        useconds_t nr_usec = 0;
+       char *tmp_file_path = NULL;
 
        if (argc >= 2) {
                nr_iter = atoi(argv[1]);
@@ -47,10 +65,22 @@ int main(int argc, char **argv)
                nr_usec = atoi(argv[2]);
        }
 
+       if (argc == 4) {
+               tmp_file_path = argv[3];
+       }
+
        for (i = 0; i < nr_iter; i++) {
                netint = htonl(i);
-               tracepoint(tp, tptest, i, netint, values, text, strlen(text),
-                          dbl, flt);
+               tracepoint(tp, tptest, i, netint, values, text, strlen(text), dbl,
+                               flt);
+
+               /*
+                * First loop we create the file if asked to indicate that at least one
+                * tracepoint has been hit.
+                */
+               if (i == 0 && tmp_file_path) {
+                       create_file(tmp_file_path);
+               }
                usleep(nr_usec);
        }