#define FUSE_USE_VERSION 34
 
 
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <assert.h>
#include <stddef.h>
#include <unistd.h>
#include <pthread.h>
 
#define NO_TIMEOUT 500000
 
#define MAX_STR_LEN 128
#define TIME_FILE_NAME "current_time"
#define TIME_FILE_INO 2
#define GROW_FILE_NAME "growing"
#define GROW_FILE_INO 3
 
static char time_file_contents[MAX_STR_LEN];
static size_t grow_file_size;
 
struct options {
        int no_notify;
        int update_interval;
};
static struct options options = {
                .no_notify = 0,
                .update_interval = 1,
};
 
#define OPTION(t, p) { t, offsetof(struct options, p), 1 }
static const struct fuse_opt option_spec[] = {
 
                OPTION("--no-notify", no_notify),
                OPTION("--update-interval=%d", update_interval),
};
 
{
        (void) conn;
 
        return NULL;
}
 
static int xmp_getattr(const char *path,
        (void) fi;
        if (strcmp(path, "/") == 0) {
                stbuf->st_ino = 1;
                stbuf->st_mode = S_IFDIR | 0755;
                stbuf->st_nlink = 1;
        } else if (strcmp(path, "/" TIME_FILE_NAME) == 0) {
                stbuf->st_ino = TIME_FILE_INO;
                stbuf->st_mode = S_IFREG | 0444;
                stbuf->st_nlink = 1;
                stbuf->st_size = strlen(time_file_contents);
        } else if (strcmp(path, "/" GROW_FILE_NAME) == 0) {
                stbuf->st_ino = GROW_FILE_INO;
                stbuf->st_mode = S_IFREG | 0444;
                stbuf->st_nlink = 1;
                stbuf->st_size = grow_file_size;
        } else {
                return -ENOENT;
        }
 
        return 0;
}
 
static int xmp_readdir(
const char *path, 
void *buf, 
fuse_fill_dir_t filler,
 
        (void) fi;
        (void) flags;
        if (strcmp(path, "/") != 0) {
                return -ENOTDIR;
        } else {
                (void) filler;
                (void) buf;
                struct stat file_stat;
                xmp_getattr("/" TIME_FILE_NAME, &file_stat, NULL);
                xmp_getattr("/" GROW_FILE_NAME, &file_stat, NULL);
                return 0;
        }
}
 
        (void) path;
        
        return 0;
}
 
static int xmp_read(const char *path, char *buf, size_t size, off_t offset,
        (void) fi;
        (void) offset;
        if (strcmp(path, "/" TIME_FILE_NAME) == 0) {
                int file_length = strlen(time_file_contents);
                int to_copy = offset + size <= file_length
                                ? size
                                                : file_length - offset;
                memcpy(buf, time_file_contents, to_copy);
                return to_copy;
        } else {
                assert(strcmp(path, "/" GROW_FILE_NAME) == 0);
                int to_copy = offset + size <= grow_file_size
                                ? size
                                                : grow_file_size - offset;
                memset(buf, 'x', to_copy);
                return to_copy;
        }
}
 
                .getattr  = xmp_getattr,
                .readdir  = xmp_readdir,
                .open     = xmp_open,
                .read     = xmp_read,
};
 
static void update_fs(void) {
        static int count = 0;
        struct tm *now;
        time_t t;
        t = time(NULL);
        now = localtime(&t);
        assert(now != NULL);
 
        int time_file_size = strftime(time_file_contents, MAX_STR_LEN,
                        "The current time is %H:%M:%S\n", now);
        assert(time_file_size != 0);
 
        grow_file_size = count++;
}
 
static int invalidate(struct fuse *fuse, const char *path) {
        if (status == -ENOENT) {
                return 0;
        } else {
                return status;
        }
}
 
static void* update_fs_loop(void *data) {
        struct fuse *fuse = (struct fuse*) data;
 
        while (1) {
                update_fs();
                if (!options.no_notify) {
                        assert(invalidate(fuse, "/" TIME_FILE_NAME) == 0);
                        assert(invalidate(fuse, "/" GROW_FILE_NAME) == 0);
                }
                sleep(options.update_interval);
        }
        return NULL;
}
 
static void show_help(const char *progname)
{
        printf("usage: %s [options] <mountpoint>\n\n", progname);
        printf("File-system specific options:\n"
                        "    --update-interval=<secs>  Update-rate of file system contents\n"
                        "    --no-notify            Disable kernel notifications\n"
                        "\n");
}
 
int main(int argc, char *argv[]) {
        struct fuse *fuse;
        int res;
 
        
        update_fs();
 
                return 1;
 
        if (fuse_parse_cmdline(&args, &opts) != 0)
                return 1;
 
        if (opts.show_version) {
                res = 0;
                goto out1;
        } else if (opts.show_help) {
                show_help(argv[0]);
                res = 0;
                goto out1;
        } else if (!opts.mountpoint) {
                fprintf(stderr, "error: no mountpoint specified\n");
                res = 1;
                goto out1;
        }
 
        fuse = fuse_new(&args, &xmp_oper, sizeof(xmp_oper), NULL);
        if (fuse == NULL) {
                res = 1;
                goto out1;
        }
 
                res = 1;
                goto out2;
        }
 
                res = 1;
                goto out3;
        }
 
        pthread_t updater;     
        int ret = pthread_create(&updater, NULL, update_fs_loop, (void *) fuse);
        if (ret != 0) {
                fprintf(stderr, "pthread_create failed with %s\n", strerror(ret));
                return 1;
        };
 
                res = 1;
                goto out3;
        }
 
        if (opts.singlethread)
        else {
                config.clone_fd = opts.clone_fd;
                config.max_idle_threads = opts.max_idle_threads;
                res = fuse_loop_mt(fuse, &config);
        }
        if (res)
                res = 1;
 
out3:
out2:
out1:
        free(opts.mountpoint);
        return res;
}
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)
struct fuse_session * fuse_get_session(struct fuse *f)
void fuse_unmount(struct fuse *f)
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)
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)