RSRegion* rs_region_open(const char* path, bool write)
{
RSRegion* self;
struct stat stat_buf;
void* map = NULL;
int fd = open(path, write ? (O_RDWR | O_CREAT) : O_RDONLY, 0666);
if (fd < 0)
{
return NULL; /* TODO proper error handling */
}
if (fstat(fd, &stat_buf) < 0)
{
close(fd);
return NULL;
}
/* zero size is valid, but anything between 0 and 8192 isn't */
if (stat_buf.st_size > 0 && stat_buf.st_size < 8192)
{
close(fd);
return NULL;
}
if (stat_buf.st_size > 0)
{
map = mmap(NULL, stat_buf.st_size, write ? (PROT_READ | PROT_WRITE) : PROT_READ, MAP_SHARED, fd, 0);
if (map == MAP_FAILED)
{
close(fd);
return NULL;
}
}
self = rs_new0(RSRegion, 1);
self->path = rs_strdup(path);
self->write = write;
self->fd = fd;
self->fsize = stat_buf.st_size;
self->map = map;
self->cached_writes = NULL;
self->locations = NULL;
self->timestamps = NULL;
if (self->map)
{
self->locations = (struct ChunkLocation*)(self->map);
self->timestamps = (uint32_t*)(self->map + 4096);
}
return self;
}
RSList* rs_list_cell_new(void)
{
RSList* cell = rs_new0(RSList, 1);
return cell;
}
