problemFuse.h File Reference

The file contains all the fuse callbacks implemented. More...

#include <errno.h>
#include <fcntl.h>
#include <fuse.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/types.h>
#include <time.h>
#include <unistd.h>

Include dependency graph for problemFuse.h:

Go to the source code of this file.

Macros
#define	_FILE_OFFSET_BITS   64
#define	FUSE_USE_VERSION   30
#define	_XOPEN_SOURCE   500

Functions
void	fpr_init (const char *path)
	initializer for the fuse.problem filesystem More...
void	fpr_destroy ()
	destroyer for the fuse.problem filesystem. More...
int	fpr_getattr (const char *path, struct stat *stbuf)
	getattr callback for fuse.problem More...
int	fpr_readdir (const char *path, void *buf, fuse_fill_dir_t filler, off_t offset, struct fuse_file_info *fi)
	fill the stat struct for the filesystem More...
int	fpr_open (const char *path, struct fuse_file_info *fi)
	open file operation More...
int	fpr_read (const char *path, char *buf, size_t size, off_t offset, struct fuse_file_info *fi)
	read callback for getting file content More...
int	fpr_write (const char *path, const char *buf, size_t size, off_t offset, struct fuse_file_info *fi)
	write callback More...
int	fpr_truncate (const char *path, off_t size)
	truncate a file (fix it to zero when overwritten) More...

Variables
void *	problem

Detailed Description

The file contains all the fuse callbacks implemented.

The file contains all the fuse callbacks implemented

Function Documentation

fpr_destroy()

void fpr_destroy

(

)

destroyer for the fuse.problem filesystem.

Destroys the fuse Problem class

fpr_getattr()

int fpr_getattr	(	const char *	path,
		struct stat *	stbuf
	)

getattr callback for fuse.problem

The getattr callback should fill a stat struct that contains the times for the different files and access attributes. This is a callback. This function is exported in C

Parameters

path	the path of the inode that is stat
stbuf	the struct stat that must be filled

Returns

a 0 int when succeed, and a -ENOENT on error (path unknown)

fpr_init()

void fpr_init

(

const char *

path

)

initializer for the fuse.problem filesystem

This function creates a new pointer for the fuse problem that will be used throughout the library. This function is exported in C

Parameters

path	path of the shared library that contains the shared object

fpr_open()

int fpr_open	(	const char *	path,
		struct fuse_file_info *	fi
	)

open file operation

The function sets the direct_io flag to one. This changes the behaviour in reading for the filesystem. Return 0 if the file exists, while -ENOENT when file does not exist. This function is exported in C

Parameters

path	the path of the file to be opened
fi	the fuse struct that contains info for the file

Returns

zero or -ENOENT

fpr_read()

int fpr_read	(	const char *	path,
		char *	buf,
		size_t	size,
		off_t	offset,
		struct fuse_file_info *	fi
	)

read callback for getting file content

This callback calls the Problem<FP>::read method and returns exactly the data into buf. Theread operation guarantees the direct I/O flag set to true. This function is exported in C

Parameters

path	the path of the file
buf	the buffer in which data will be called
size	maximum size writable
offset	offset for reading
fi	struct of the file from fuse

Returns

number of bytes written

fpr_readdir()

int fpr_readdir	(	const char *	path,
		void *	buf,
		fuse_fill_dir_t	filler,
		off_t	offset,
		struct fuse_file_info *	fi
	)

fill the stat struct for the filesystem

Fills recursively the stat struct that contains the access informations and the contained file system. This is a callback. This function is exported in C

Parameters

path	the current file path
buf	an internal buffer required by the callback
filler
offset
fi

Returns

a 0 on success, -ENOENT if not found

fpr_truncate()

int fpr_truncate	(	const char *	path,
		off_t	size
	)

truncate a file (fix it to zero when overwritten)

Function called before a write. It is necessary to guarantee that write operation will be performed. It is almost a dummy function that returns zero when succeed and -ENOENT when the file does not exist. This function is exported in C

Parameters

path	file to be truncated
offset	size (unused) return 0 or -ENOENT

fpr_write()

int fpr_write	(	const char *	path,
		const char *	buf,
		size_t	size,
		off_t	offset,
		struct fuse_file_info *	fi
	)

write callback

The write callback calls the problem write opeation and it is used to get the data to be parsed. When a write is called, it also fires an update operation with a re-evaluation of all functions. This function is exported in C

Parameters

path	the path of the file to be written
buf	the buffer that will be written
size	the size of data to be written (unused)
offset	offset of the data to be written (unused)
fi	struct of fuse filesystem

Returns

number of byte written in the filesystem

Variable Documentation

problem

void* problem

external global variable that contains the problem lib path