62 #define FUSE_USE_VERSION 34 
   64 #include <fuse_lowlevel.h> 
   77 #define NO_TIMEOUT 500000 
   79 #define MAX_STR_LEN 128 
   81 #define FILE_NAME "current_time" 
   82 static char file_contents[MAX_STR_LEN];
 
   83 static int lookup_cnt = 0;
 
   84 static size_t file_size;
 
   91 static struct options options = {
 
   96 #define OPTION(t, p)                           \ 
   97     { t, offsetof(struct options, p), 1 } 
   98 static const struct fuse_opt option_spec[] = {
 
   99     OPTION(
"--no-notify", no_notify),
 
  100     OPTION(
"--update-interval=%d", update_interval),
 
  104 static 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)
 
  175 static 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)) 
  189 static 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,
 
  251 static 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);
 
  263 static 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);
 
  279 static 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" 
  288 int main(
int argc, 
char *argv[]) {
 
  290     struct fuse_session *se;
 
  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)
int fuse_parse_cmdline(struct fuse_args *args, struct fuse_cmdline_opts *opts)
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)
struct fuse_session * fuse_session_new(struct fuse_args *args, const struct fuse_lowlevel_ops *op, size_t op_size, void *userdata)
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)