/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ /*** 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 "util.h" #include "sigbus.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(); }