src/test/test-sigbus.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2014 Lennart Poettering
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include <sys/mman.h>
  21
  22 #include "fd-util.h"
  23 #include "sigbus.h"
  24 #include "util.h"
  25
  26 int main(int argc, char *argv[]) {
  27         _cleanup_close_ int fd = -1;
  28         char template[] = "/tmp/sigbus-test-XXXXXX";
  29         void *addr = NULL;
  30         uint8_t *p;
  31
  32         sigbus_install();
  33
  34         assert_se(sigbus_pop(&addr) == 0);
  35
  36         assert_se((fd = mkostemp(template, O_RDWR|O_CREAT|O_EXCL)) >= 0);
  37         assert_se(unlink(template) >= 0);
  38         assert_se(fallocate(fd, 0, 0, page_size() * 8) >= 0);
  39
  40         p = mmap(NULL, page_size() * 16, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
  41         assert_se(p != MAP_FAILED);
  42
  43         assert_se(sigbus_pop(&addr) == 0);
  44
  45         p[0] = 0xFF;
  46         assert_se(sigbus_pop(&addr) == 0);
  47
  48         p[page_size()] = 0xFF;
  49         assert_se(sigbus_pop(&addr) == 0);
  50
  51         p[page_size()*8] = 0xFF;
  52         p[page_size()*8+1] = 0xFF;
  53         p[page_size()*10] = 0xFF;
  54         assert_se(sigbus_pop(&addr) > 0);
  55         assert_se(addr == p + page_size() * 8);
  56         assert_se(sigbus_pop(&addr) > 0);
  57         assert_se(addr == p + page_size() * 10);
  58         assert_se(sigbus_pop(&addr) == 0);
  59
  60         sigbus_reset();
  61 }