Tests: Add a test utils library

[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..f1eb18f52f927cb7ffd6181d11f2d19666768e42 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 +15,10 @@
  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
  */
 
+#define _LGPL_SOURCE
+#include <assert.h>
 #include <arpa/inet.h>
+#include <fcntl.h>
 #include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -24,34 +27,108 @@
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <unistd.h>
+#include <stdbool.h>
+#include <signal.h>
+#include <poll.h>
+#include <errno.h>
 
 #define TRACEPOINT_DEFINE
 #include "tp.h"
 
+void create_file(const char *path)
+{
+       static bool file_created = false;
+       int ret;
+
+       if (!path || file_created) {
+               return;
+       }
+
+       ret = creat(path, S_IRWXU);
+       if (ret < 0) {
+               fprintf(stderr, "Failed to create file %s\n", path);
+               return;
+       }
+
+       (void) close(ret);
+       file_created = true;
+}
+
+static
+void wait_on_file(const char *path)
+{
+       if (!path) {
+               return;
+       }
+       for (;;) {
+               int ret;
+               struct stat buf;
+
+               ret = stat(path, &buf);
+               if (ret == -1 && errno == ENOENT) {
+                       (void) poll(NULL, 0, 10);       /* 10 ms delay */
+                       continue;                       /* retry */
+               }
+               if (ret) {
+                       perror("stat");
+                       exit(EXIT_FAILURE);
+               }
+               break;  /* found */
+       }
+}
+
 int main(int argc, char **argv)
 {
-       int i, netint;
+       unsigned int i, netint;
        long values[] = { 1, 2, 3 };
        char text[10] = "test";
        double dbl = 2.0;
        float flt = 2222.0;
-       unsigned int nr_iter = 100;
+       int nr_iter = 100;
        useconds_t nr_usec = 0;
+       char *after_first_event_file_path = NULL;
+       char *before_last_event_file_path = NULL;
 
        if (argc >= 2) {
+               /*
+                * If nr_iter is negative, do an infinite tracing loop.
+                */
                nr_iter = atoi(argv[1]);
        }
 
-       if (argc == 3) {
+       if (argc >= 3) {
                /* By default, don't wait unless user specifies. */
                nr_usec = atoi(argv[2]);
        }
 
-       for (i = 0; i < nr_iter; i++) {
+       if (argc >= 4) {
+               after_first_event_file_path = argv[3];
+       }
+
+       if (argc >= 5) {
+               before_last_event_file_path = argv[4];
+       }
+
+       for (i = 0; nr_iter < 0 || i < nr_iter; i++) {
+               if (nr_iter >= 0 && i == nr_iter - 1) {
+                       /*
+                        * Wait on synchronization before writing last
+                        * event.
+                        */
+                       wait_on_file(before_last_event_file_path);
+               }
                netint = htonl(i);
-               tracepoint(tp, tptest, i, netint, values, text, strlen(text),
-                          dbl, flt);
-               usleep(nr_usec);
+               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.
+                */
+               create_file(after_first_event_file_path);
+               if (nr_usec) {
+                       usleep(nr_usec);
+               }
        }
 
        return 0;