28 #define FUSE_USE_VERSION 34 
   31 #include <fuse_lowlevel.h>   
   45 #define NO_TIMEOUT 500000 
   47 #define MAX_STR_LEN 128 
   48 #define TIME_FILE_NAME "current_time" 
   49 #define TIME_FILE_INO 2 
   50 #define GROW_FILE_NAME "growing" 
   51 #define GROW_FILE_INO 3 
   53 static char time_file_contents[MAX_STR_LEN];
 
   54 static size_t grow_file_size;
 
   61 static struct options options = {
 
   66 #define OPTION(t, p) { t, offsetof(struct options, p), 1 } 
   67 static const struct fuse_opt option_spec[] = {
 
   68                 OPTION(
"--no-notify", no_notify),
 
   69                 OPTION(
"--update-interval=%d", update_interval),
 
   83 static int xmp_getattr(
const char *path,
 
   86         if (strcmp(path, 
"/") == 0) {
 
   88                 stbuf->st_mode = S_IFDIR | 0755;
 
   90         } 
else if (strcmp(path, 
"/" TIME_FILE_NAME) == 0) {
 
   91                 stbuf->st_ino = TIME_FILE_INO;
 
   92                 stbuf->st_mode = S_IFREG | 0444;
 
   94                 stbuf->st_size = strlen(time_file_contents);
 
   95         } 
else if (strcmp(path, 
"/" GROW_FILE_NAME) == 0) {
 
   96                 stbuf->st_ino = GROW_FILE_INO;
 
   97                 stbuf->st_mode = S_IFREG | 0444;
 
   99                 stbuf->st_size = grow_file_size;
 
  107 static int xmp_readdir(
const char *path, 
void *buf, 
fuse_fill_dir_t filler,
 
  113         if (strcmp(path, 
"/") != 0) {
 
  118                 struct stat file_stat;
 
  119                 xmp_getattr(
"/" TIME_FILE_NAME, &file_stat, NULL);
 
  120                 filler(buf, TIME_FILE_NAME, &file_stat, 0, 0);
 
  121                 xmp_getattr(
"/" GROW_FILE_NAME, &file_stat, NULL);
 
  122                 filler(buf, GROW_FILE_NAME, &file_stat, 0, 0);
 
  127 static int xmp_open(
const char *path, 
struct fuse_file_info *fi) {
 
  135 static int xmp_read(
const char *path, 
char *buf, 
size_t size, off_t offset,
 
  139         if (strcmp(path, 
"/" TIME_FILE_NAME) == 0) {
 
  140                 int file_length = strlen(time_file_contents);
 
  141                 int to_copy = offset + size <= file_length
 
  143                                                 : file_length - offset;
 
  144                 memcpy(buf, time_file_contents, to_copy);
 
  147                 assert(strcmp(path, 
"/" GROW_FILE_NAME) == 0);
 
  148                 int to_copy = offset + size <= grow_file_size
 
  150                                                 : grow_file_size - offset;
 
  151                 memset(buf, 
'x', to_copy);
 
  158                 .getattr  = xmp_getattr,
 
  159                 .readdir  = xmp_readdir,
 
  164 static void update_fs(
void) {
 
  165         static int count = 0;
 
  172         int time_file_size = strftime(time_file_contents, MAX_STR_LEN,
 
  173                         "The current time is %H:%M:%S\n", now);
 
  174         assert(time_file_size != 0);
 
  176         grow_file_size = count++;
 
  179 static int invalidate(
struct fuse *fuse, 
const char *path) {
 
  181         if (status == -ENOENT) {
 
  188 static void* update_fs_loop(
void *data) {
 
  189         struct fuse *fuse = (
struct fuse*) data;
 
  193                 if (!options.no_notify) {
 
  194                         assert(invalidate(fuse, 
"/" TIME_FILE_NAME) == 0);
 
  195                         assert(invalidate(fuse, 
"/" GROW_FILE_NAME) == 0);
 
  197                 sleep(options.update_interval);
 
  202 static void show_help(
const char *progname)
 
  204         printf(
"usage: %s [options] <mountpoint>\n\n", progname);
 
  205         printf(
"File-system specific options:\n" 
  206                         "    --update-interval=<secs>  Update-rate of file system contents\n" 
  207                         "    --no-notify            Disable kernel notifications\n" 
  211 int main(
int argc, 
char *argv[]) {
 
  227         if (opts.show_version) {
 
  232         } 
else if (opts.show_help) {
 
  238         } 
else if (!opts.mountpoint) {
 
  239                 fprintf(stderr, 
"error: no mountpoint specified\n");
 
  244         fuse = 
fuse_new(&args, &xmp_oper, 
sizeof(xmp_oper), NULL);
 
  261         int ret = pthread_create(&updater, NULL, update_fs_loop, (
void *) fuse);
 
  263                 fprintf(stderr, 
"pthread_create failed with %s\n", strerror(ret));
 
  273         if (opts.singlethread)
 
  276                 config.clone_fd = opts.clone_fd;
 
  277                 config.max_idle_threads = opts.max_idle_threads;
 
  278                 res = fuse_loop_mt(fuse, &config);
 
  289         free(opts.mountpoint);
 
struct fuse_session * fuse_get_session(struct fuse *f)
int fuse_mount(struct fuse *f, const char *mountpoint)
void fuse_destroy(struct fuse *f)
int fuse_invalidate_path(struct fuse *f, const char *path)
int fuse_loop(struct fuse *f)
int(* fuse_fill_dir_t)(void *buf, const char *name, const struct stat *stbuf, off_t off, enum fuse_fill_dir_flags flags)
void fuse_lib_help(struct fuse_args *args)
void fuse_unmount(struct fuse *f)
struct fuse * fuse_new(struct fuse_args *args, const struct fuse_operations *op, size_t op_size, void *private_data)
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_cmdline_help(void)
int fuse_parse_cmdline(struct fuse_args *args, struct fuse_cmdline_opts *opts)
void fuse_lowlevel_version(void)
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 *(* init)(struct fuse_conn_info *conn, struct fuse_config *cfg)