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 "usterr.h"
  30 #include "tp.h"
  31
  32 void inthandler(int sig)
  33 {
  34         printf("in SIGUSR1 handler\n");
  35         tracepoint(ust_tests_hello_tptest_sighandler);
  36 }
  37
  38 int init_int_handler(void)
  39 {
  40         int result;
  41         struct sigaction act;
  42
  43         result = sigemptyset(&act.sa_mask);
  44         if (result == -1) {
  45                 PERROR("sigemptyset");
  46                 return -1;
  47         }
  48
  49         act.sa_handler = inthandler;
  50         act.sa_flags = SA_RESTART;
  51
  52         /* Only defer ourselves. Also, try to restart interrupted
  53          * syscalls to disturb the traced program as little as possible.
  54          */
  55         result = sigaction(SIGUSR1, &act, NULL);
  56         if (result == -1) {
  57                 PERROR("sigaction");
  58                 return -1;
  59         }
  60
  61         return 0;
  62 }
  63
  64 int main(int argc, char **argv)
  65 {
  66         int i;
  67
  68         init_int_handler();
  69
  70         printf("Hello, World!\n");
  71
  72         sleep(1);
  73
  74         for (i = 0; i < 50; i++) {
  75                 tracepoint(ust_tests_hello_tptest, i);
  76                 usleep(100000);
  77         }
  78         return 0;
  79 }