tests/hello/hello.c

   1 /*
   2  * Copyright (C) 2009  Pierre-Marc Fournier
   3  * Copyright (C) 2011  Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; version 2.1 of
   8  * the License.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
  18  */
  19
  20 #include <stdio.h>
  21 #include <unistd.h>
  22 #include <sys/mman.h>
  23 #include <stdarg.h>
  24 #include <sys/types.h>
  25 #include <sys/stat.h>
  26 #include <fcntl.h>
  27 #include <signal.h>
  28
  29 #include "ust_tests_hello.h"
  30
  31 void inthandler(int sig)
  32 {
  33         printf("in SIGUSR1 handler\n");
  34         tracepoint(ust_tests_hello_tptest_sighandler);
  35 }
  36
  37 int init_int_handler(void)
  38 {
  39         int result;
  40         struct sigaction act;
  41
  42         result = sigemptyset(&act.sa_mask);
  43         if (result == -1) {
  44                 perror("sigemptyset");
  45                 return -1;
  46         }
  47
  48         act.sa_handler = inthandler;
  49         act.sa_flags = SA_RESTART;
  50
  51         /* Only defer ourselves. Also, try to restart interrupted
  52          * syscalls to disturb the traced program as little as possible.
  53          */
  54         result = sigaction(SIGUSR1, &act, NULL);
  55         if (result == -1) {
  56                 perror("sigaction");
  57                 return -1;
  58         }
  59
  60         return 0;
  61 }
  62
  63 int main(int argc, char **argv)
  64 {
  65         int i;
  66
  67         init_int_handler();
  68
  69         printf("Hello, World!\n");
  70
  71         sleep(1);
  72
  73         for (i = 0; i < 50; i++) {
  74                 tracepoint(ust_tests_hello_tptest, i);
  75                 usleep(100000);
  76         }
  77         return 0;
  78 }