hello.c

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/*
    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` hello.c -o hello
*/

#define FUSE_USE_VERSION 26

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

static const char *hello_str = "Hello World!\n";
static const char *hello_path = "/hello";

static int hello_getattr(const char *path, struct stat *stbuf)
{
  int res = 0;

  memset(stbuf, 0, sizeof(struct stat));
  if(strcmp(path, "/") == 0)
    {
      stbuf->st_ino = 1;
      stbuf->st_mode = S_IFDIR | 0755;
      stbuf->st_nlink = 2;
    }
  else if(strcmp(path, hello_path) == 0)
    {
      stbuf->st_ino = 2;
      stbuf->st_mode = S_IFREG | 0444;
      stbuf->st_nlink = 1;
      stbuf->st_size = strlen(hello_str);
    }
  else
    res = -ENOENT;

  return res;
}

static int hello_readdir(const char *path, void *buf, fuse_fill_dir_t filler,
                         off_t offset, struct fuse_file_info *fi)
{
  (void)offset;
  (void)fi;

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

  filler(buf, ".", NULL, 0);
  filler(buf, "..", NULL, 0);
  filler(buf, hello_path + 1, NULL, 0);

  return 0;
}

static int hello_open(const char *path, struct fuse_file_info *fi)
{
  if(strcmp(path, hello_path) != 0)
    return -ENOENT;

  if((fi->flags & 3) != O_RDONLY)
    return -EACCES;

  return 0;
}

static int hello_read(const char *path, char *buf, size_t size, off_t offset,
                      struct fuse_file_info *fi)
{
  size_t len;
  (void)fi;
  if(strcmp(path, hello_path) != 0)
    return -ENOENT;

  len = strlen(hello_str);
  if(offset < len)
    {
      if(offset + size > len)
        size = len - offset;
      memcpy(buf, hello_str + offset, size);
    }
  else
    size = 0;

  return size;
}

static struct fuse_operations hello_oper = {
  .getattr = hello_getattr,
  .readdir = hello_readdir,
  .open = hello_open,
  .read = hello_read,
};

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