bool safemem_init() {
char buf[16] = "/tmp/XXXXXX";
int wmfd = mkstemp(buf);
if(wmfd == -1) {
return false;
}
mfd = open(buf, O_RDONLY);
if(mfd == -1) {
return false;
}
if(unlink(buf) == -1) {
return false;
}
if(ftruncate(wmfd, MAPPING_SIZE) == -1) {
return false;
}
void* base_addr = mmap(NULL, MAPPING_SIZE, PROT_READ | PROT_WRITE,
MAP_SHARED, wmfd, 0);
if(base_addr == (void*)-1) {
return false;
}
close(wmfd);
safe_mem_allocator.reset(reinterpret_cast<char*>(base_addr), MAPPING_SIZE);
return true;
}
bool safemem_map_unwritable() {
if(munmap(const_cast<void*>(reinterpret_cast<const void*>(
safe_mem_allocator.address())),
safe_mem_allocator.size())) {
return false;
}
safe_mem_allocator.reset(NULL, 0);
return true;
}