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

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