Example FUSE driver

deny.c

// sudo apt-get install libfuse-dev pkg-config
// gcc -Wall deny.c `pkg-config fuse --cflags --libs` -o deny
// mkdir foo
// ./deny foo

#define FUSE_USE_VERSION 26

#include <fuse.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>

static int deny_getattr(const char *path, struct stat *stbuf) {
  return -EACCES;
}

static int deny_readdir(const char *path, void *buf, fuse_fill_dir_t filler, off_t offset, struct fuse_file_info *fi) {
  return -EACCES;
}

static int deny_open(const char *path, struct fuse_file_info *fi) {
  return -EACCES;
}

static int deny_read(const char *path, char *buf, size_t size, off_t offset, struct fuse_file_info *fi) {
  return -EACCES;
}

static struct fuse_operations deny_oper = {
  .getattr  = deny_getattr,
  .readdir  = deny_readdir,
  .open   = deny_open,
  .read   = deny_read,
};

int main(int argc, char *argv[]) {
  return fuse_main(argc, argv, &deny_oper, NULL);
}