text: /*
    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 <stdint.h>
  #include <fuse.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_mode = S_IFDIR | 0755;
  		stbuf->st_nlink = 2;
  	} else if (strcmp(path, hello_path) == 0) {
  		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 = {
  #if 0
  	.getattr	= hello_getattr,
  	.readdir	= hello_readdir,
  	.open		= hello_open,
  	.read		= hello_read,
  #endif
  	0
  };
  
  int main(int argc, char *argv[])
  {
  	hello_oper.getattr	= hello_getattr;
  	hello_oper.readdir	= hello_readdir;
  	hello_oper.open		= hello_open;
  	hello_oper.read		= hello_read;
  	return fuse_main(argc, argv, &hello_oper, NULL);
  }
  