62#define FUSE_USE_VERSION 34 
   77#define NO_TIMEOUT 500000 
   79#define MAX_STR_LEN 128 
   81#define FILE_NAME "current_time" 
   82static char file_contents[MAX_STR_LEN];
 
   83static int lookup_cnt = 0;
 
   84static size_t file_size;
 
   91static struct options options = {
 
   97    { t, offsetof(struct options, p), 1 } 
   98static const struct fuse_opt option_spec[] = {
 
   99    OPTION(
"--no-notify", no_notify),
 
  100    OPTION(
"--update-interval=%d", update_interval),
 
  104static int tfs_stat(
fuse_ino_t ino, 
struct stat *stbuf) {
 
  107        stbuf->st_mode = S_IFDIR | 0755;
 
  111    else if (ino == FILE_INO) {
 
  112        stbuf->st_mode = S_IFREG | 0444;
 
  114        stbuf->st_size = file_size;
 
  126    memset(&e, 0, 
sizeof(e));
 
  130    else if (strcmp(name, FILE_NAME) == 0) {
 
  136    e.attr_timeout = NO_TIMEOUT;
 
  137    e.entry_timeout = NO_TIMEOUT;
 
  138    if (tfs_stat(e.ino, &e.attr) != 0)
 
  151        lookup_cnt -= nlookup;
 
  163    memset(&stbuf, 0, 
sizeof(stbuf));
 
  164    if (tfs_stat(ino, &stbuf) != 0)
 
  175static void dirbuf_add(
fuse_req_t req, 
struct dirbuf *b, 
const char *name,
 
  178    size_t oldsize = b->size;
 
  180    b->p = (
char *) realloc(b->p, b->size);
 
  181    memset(&stbuf, 0, 
sizeof(stbuf));
 
  187#define min(x, y) ((x) < (y) ? (x) : (y)) 
  189static int reply_buf_limited(
fuse_req_t req, 
const char *buf, 
size_t bufsize,
 
  190                             off_t off, 
size_t maxsize) {
 
  193                              min(bufsize - off, maxsize));
 
  207        memset(&b, 0, 
sizeof(b));
 
  208        dirbuf_add(req, &b, FILE_NAME, FILE_INO);
 
  209        reply_buf_limited(req, b.p, b.size, off, size);
 
  223    else if ((fi->
flags & O_ACCMODE) != O_RDONLY)
 
  225    else if (ino == FILE_INO)
 
  229        fprintf(stderr, 
"Got open for non-existing inode!\n");
 
  238    assert(ino == FILE_INO);
 
  239    reply_buf_limited(req, file_contents, file_size, off, size);
 
  244    .getattr    = tfs_getattr,
 
  245    .readdir    = tfs_readdir,
 
  248    .forget     = tfs_forget,
 
  251static void update_fs(
void) {
 
  258    file_size = strftime(file_contents, MAX_STR_LEN,
 
  259                         "The current time is %H:%M:%S\n", now);
 
  260    assert(file_size != 0);
 
  263static void* update_fs_loop(
void *data) {
 
  264    struct fuse_session *se = (
struct fuse_session*) data;
 
  268        if (!options.no_notify && lookup_cnt) {
 
  272                   (se, FILE_INO, 0, 0) == 0);
 
  274        sleep(options.update_interval);
 
  279static void show_help(
const char *progname)
 
  281    printf(
"usage: %s [options] <mountpoint>\n\n", progname);
 
  282    printf(
"File-system specific options:\n" 
  283               "    --update-interval=<secs>  Update-rate of file system contents\n" 
  284               "    --no-notify            Disable kernel notifications\n" 
  288int main(
int argc, 
char *argv[]) {
 
  290    struct fuse_session *se;
 
  299    if (fuse_parse_cmdline(&args, &opts) != 0) {
 
  304    if (opts.show_help) {
 
  310    } 
else if (opts.show_version) {
 
  321                          sizeof(tfs_oper), NULL);
 
  334    ret = pthread_create(&updater, NULL, update_fs_loop, (
void *)se);
 
  336        fprintf(stderr, 
"pthread_create failed with %s\n",
 
  342    if (opts.singlethread)
 
  345        config.clone_fd = opts.clone_fd;
 
  346        config.max_idle_threads = opts.max_idle_threads;
 
  347        ret = fuse_session_loop_mt(se, &config);
 
  357    free(opts.mountpoint);
 
int fuse_set_signal_handlers(struct fuse_session *se)
const char * fuse_pkgversion(void)
void fuse_remove_signal_handlers(struct fuse_session *se)
int fuse_daemonize(int foreground)
void fuse_session_destroy(struct fuse_session *se)
int fuse_reply_open(fuse_req_t req, const struct fuse_file_info *fi)
int fuse_reply_err(fuse_req_t req, int err)
int fuse_reply_buf(fuse_req_t req, const char *buf, size_t size)
struct fuse_req * fuse_req_t
int fuse_session_loop(struct fuse_session *se)
int fuse_reply_entry(fuse_req_t req, const struct fuse_entry_param *e)
void fuse_session_unmount(struct fuse_session *se)
void fuse_cmdline_help(void)
struct fuse_session * fuse_session_new(struct fuse_args *args, const struct fuse_lowlevel_ops *op, size_t op_size, void *userdata)
void fuse_reply_none(fuse_req_t req)
void fuse_lowlevel_help(void)
int fuse_lowlevel_notify_inval_inode(struct fuse_session *se, fuse_ino_t ino, off_t off, off_t len)
int fuse_session_mount(struct fuse_session *se, const char *mountpoint)
void fuse_lowlevel_version(void)
size_t fuse_add_direntry(fuse_req_t req, char *buf, size_t bufsize, const char *name, const struct stat *stbuf, off_t off)
int fuse_reply_attr(fuse_req_t req, const struct stat *attr, double attr_timeout)
void fuse_opt_free_args(struct fuse_args *args)
int fuse_opt_parse(struct fuse_args *args, void *data, const struct fuse_opt opts[], fuse_opt_proc_t proc)
#define FUSE_ARGS_INIT(argc, argv)
void(* lookup)(fuse_req_t req, fuse_ino_t parent, const char *name)