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null.c

/*
  FUSE: Filesystem in Userspace
  Copyright (C) 2001-2007  Miklos Szeredi <miklos@szeredi.hu>

  This program can be distributed under the terms of the GNU GPL.
  See the file COPYING.

  gcc -Wall `pkg-config fuse --cflags --libs` null.c -o null
*/

#define FUSE_USE_VERSION 26

#include <fuse.h>
#include <string.h>
#include <unistd.h>
#include <time.h>
#include <errno.h>

static int null_getattr(const char *path, struct stat *stbuf)
{
      if(strcmp(path, "/") != 0)
            return -ENOENT;

      stbuf->st_mode = S_IFREG | 0644;
      stbuf->st_nlink = 1;
      stbuf->st_uid = getuid();
      stbuf->st_gid = getgid();
      stbuf->st_size = (1ULL << 32); /* 4G */
      stbuf->st_blocks = 0;
      stbuf->st_atime = stbuf->st_mtime = stbuf->st_ctime = time(NULL);

      return 0;
}

static int null_truncate(const char *path, off_t size)
{
      (void) size;

      if(strcmp(path, "/") != 0)
            return -ENOENT;

      return 0;
}

static int null_open(const char *path, struct fuse_file_info *fi)
{
      (void) fi;

      if(strcmp(path, "/") != 0)
            return -ENOENT;

      return 0;
}

static int null_read(const char *path, char *buf, size_t size,
                 off_t offset, struct fuse_file_info *fi)
{
      (void) buf;
      (void) offset;
      (void) fi;

      if(strcmp(path, "/") != 0)
            return -ENOENT;

      if (offset >= (1ULL << 32))
            return 0;

      return size;
}

static int null_write(const char *path, const char *buf, size_t size,
                  off_t offset, struct fuse_file_info *fi)
{
      (void) buf;
      (void) offset;
      (void) fi;

      if(strcmp(path, "/") != 0)
            return -ENOENT;

      return size;
}

static struct fuse_operations null_oper = {
      .getattr    = null_getattr,
      .truncate   = null_truncate,
      .open       = null_open,
      .read       = null_read,
      .write            = null_write,
};

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

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