[Xcb] Questions about XCB using domain sockets.

[xc haze]

Hi:
When I look at XCB communication，
static int _xcb_open_abstract(char *protocol, const char *file, size_t
filelen)
{
    int fd;
    struct sockaddr_un addr = {0};
    socklen_t namelen;

    if (protocol && strcmp("unix",protocol))
        return -1;

    strcpy(addr.sun_path + 1, file);
    addr.sun_family = AF_UNIX;
    namelen = offsetof(struct sockaddr_un, sun_path) + 1 + filelen;
   。。。。。。
｝
Why do we add one to addr->sun_path?
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