doc/examples/demo-tracelog/demo-vtracelog.c

   1 /*
   2  * SPDX-License-Identifier: LGPL-2.1-only
   3  *
   4  * Copyright (C) 2020 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   5  */
   6
   7 #include <stdarg.h>
   8 #include <stdlib.h>
   9 #include <stdio.h>
  10 #include <unistd.h>
  11
  12 #include <lttng/tracelog.h>
  13
  14 static
  15 void print_err(const char* msg, ...)
  16         __attribute__((format(printf, 1, 2)));
  17 static
  18 void print_err(const char* msg, ...)
  19 {
  20         va_list ap;
  21
  22         va_start(ap, msg);
  23         lttng_ust_vtracelog(LTTNG_UST_TRACEPOINT_LOGLEVEL_ERR, msg, ap);
  24         va_end(ap);
  25 }
  26
  27 int main(int argc, char **argv)
  28 {
  29         int i;
  30         int delay = 0;
  31         const char *str = "mystring test";
  32         long l = 0x42;
  33
  34         if (argc > 2)
  35                 delay = atoi(argv[1]);
  36
  37         fprintf(stderr, "Demo program starting.\n");
  38
  39         sleep(delay);
  40
  41         fprintf(stderr, "Tracing... ");
  42
  43         for (i = 0; i < 5; i++) {
  44                 print_err("This is a \"%s\" formatted %d error event %lx", str, i, l);
  45         }
  46
  47         fprintf(stderr, " done.\n");
  48         return 0;
  49 }