/***
This file is part of systemd.
Copyright 2014 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <sys/mman.h>
#include "fd-util.h"
#include "sigbus.h"
#include "util.h"
int main(int argc, char *argv[]) {
_cleanup_close_ int fd = -1;
char template[] = "/tmp/sigbus-test-XXXXXX";
void *addr = NULL;
uint8_t *p;
sigbus_install();
assert_se(sigbus_pop(&addr) == 0);
assert_se((fd = mkostemp(template, O_RDWR|O_CREAT|O_EXCL)) >= 0);
assert_se(unlink(template) >= 0);
assert_se(fallocate(fd, 0, 0, page_size() * 8) >= 0);
p = mmap(NULL, page_size() * 16, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
assert_se(p != MAP_FAILED);
assert_se(sigbus_pop(&addr) == 0);
p[0] = 0xFF;
assert_se(sigbus_pop(&addr) == 0);
p[page_size()] = 0xFF;
assert_se(sigbus_pop(&addr) == 0);
p[page_size()*8] = 0xFF;
p[page_size()*8+1] = 0xFF;
p[page_size()*10] = 0xFF;
assert_se(sigbus_pop(&addr) > 0);
assert_se(addr == p + page_size() * 8);
assert_se(sigbus_pop(&addr) > 0);
assert_se(addr == p + page_size() * 10);
assert_se(sigbus_pop(&addr) == 0);
sigbus_reset();
}