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 __attribute__((format(printf, 1, 2)))
  15 void print_err(const char* msg, ...)
  16 {
  17         va_list ap;
  18
  19         va_start(ap, msg);
  20         vtracelog(TRACE_ERR, msg, ap);
  21         va_end(ap);
  22 }
  23
  24 int main(int argc, char **argv)
  25 {
  26         int i;
  27         int delay = 0;
  28         const char *str = "mystring test";
  29         long l = 0x42;
  30
  31         if (argc > 2)
  32                 delay = atoi(argv[1]);
  33
  34         fprintf(stderr, "Demo program starting.\n");
  35
  36         sleep(delay);
  37
  38         fprintf(stderr, "Tracing... ");
  39
  40         for (i = 0; i < 5; i++) {
  41                 print_err("This is a \"%s\" formatted %d error event %lx", str, i, l);
  42         }
  43
  44         fprintf(stderr, " done.\n");
  45         return 0;
  46 }