Functions
int	open (const char *file, int flags, int mode)
int	close (int fd)
int	read (int fd, void *buf, size_t len)
int	write (int fd, const void *buf, size_t len)
off_t	lseek (int fd, off_t offset, int whence)
int	rename (const char old, const char new)
int	unlink (const char *pathname)
int	stat (const char file, struct stat buf)
int	fstat (int fildes, struct stat *buf)
int	statfs (const char path, struct statfs buf)
int	mkdir (const char *path, mode_t mode)
int	rmdir (const char *pathname)
DIR *	opendir (const char *name)
struct dirent *	readdir (DIR *d)
long	telldir (DIR *d)
void	seekdir (DIR *d, off_t offset)
void	rewinddir (DIR *d)
int	closedir (DIR *d)
char *	getcwd (char *buf, size_t size)

Function Documentation

int open	(	const char *	file,
		int	flags,
		int	mode
	)

this function is a POSIX compliant version, which will open a file and return a file descriptor.

Parameters:

file	the path name of file.
flags	the file open flags.
mode

Returns:: the non-negative integer on successful open, others for failed.

int close ( int fd )

this function is a POSIX compliant version, which will close the open file descriptor.

Parameters:

fd	the file descriptor.

Returns:: 0 on successful, -1 on failed.

int read	(	int	fd,
		void *	buf,
		size_t	len
	)

this function is a POSIX compliant version, which will read specified data buffer length for an open file descriptor.

Parameters:

fd	the file descriptor.
buf	the buffer to save the read data.
len	the maximal length of data buffer

Returns:: the actual read data buffer length

int write	(	int	fd,
		const void *	buf,
		size_t	len
	)

this function is a POSIX compliant version, which will write specified data buffer length for an open file descriptor.

Parameters:

fd	the file descriptor
buf	the data buffer to be written.
len	the data buffer length.

Returns:: the actual written data buffer length.

off_t lseek	(	int	fd,
		off_t	offset,
		int	whence
	)

this function is a POSIX compliant version, which will seek the offset for an open file descriptor.

Parameters:

fd	the file descriptor.
offset	the offset to be seeked.
whence	the directory of seek.

Returns:: the current file position, or -1 on failed.

int rename	(	const char *	old,
		const char *	new
	)

this function is a POSIX compliant version, which will rename old file name to new file name.

Parameters:

old	the old file name.
new	the new file name.

Returns:: 0 on successful, -1 on failed.

note: the old and new file name must be belong to a same file system.

int unlink ( const char * pathname )

this function is a POSIX compliant version, which will unlink (remove) a specified path file from file system.

Parameters:

pathname the specified path name to be unlinked.

Returns:: 0 on successful, -1 on failed.

int stat	(	const char *	file,
		struct stat *	buf
	)

this function is a POSIX compliant version, which will get file information.

Parameters:

file	the file name
buf	the data buffer to save stat description.

Returns:: 0 on successful, -1 on failed.

int fstat	(	int	fildes,
		struct stat *	buf
	)

this function is a POSIX compliant version, which will get file status.

Parameters:

fildes	the file description
buf	the data buffer to save stat description.

int statfs	(	const char *	path,
		struct statfs *	buf
	)

this function is a POSIX compliant version, which will return the information about a mounted file system.

Parameters:

path	the path which mounted file system.
buf	the buffer to save the returned information.

Returns:: 0 on successful, others on failed.

int mkdir	(	const char *	path,
		mode_t	mode
	)

this function is a POSIX compliant version, which will make a directory

Parameters:

path	the directory path to be made.
mode

Returns:: 0 on successful, others on failed.

int rmdir ( const char * pathname )

this function is a POSIX compliant version, which will remove a directory.

Parameters:

pathname the path name to be removed.

Returns:: 0 on sucessfull, others on failed.

DIR* opendir ( const char * name )

this function is a POSIX compliant version, which will open a directory.

Parameters:

name	the path name to be open.

Returns:: the DIR pointer of directory, NULL on open failed.

struct dirent* readdir ( DIR * d ) [read]

this function is a POSIX compliant version, which will return a pointer to a dirent structure representing the next directory entry in the directory stream.

Parameters:

d	the directory stream pointer.

Returns:: the next directory entry, NULL on the end of directory or failed.

long telldir ( DIR * d )

this function is a POSIX compliant version, which will return current location in directory stream.

Parameters:

d	the directory stream pointer.

Returns:: the current location in directory stream.

void seekdir	(	DIR *	d,
		off_t	offset
	)

this function is a POSIX compliant version, which will set position of next directory structure in the directory stream.

Parameters:

d	the directory stream.
offset	the offset in directory stream.

void rewinddir ( DIR * d )

this function is a POSIX compliant version, which will reset directory stream.

Parameters:

d	the directory stream.

int closedir ( DIR * d )

this function is a POSIX compliant version, which will close a directory stream.

Parameters:

d	the directory stream.

Returns:: 0 on successful, -1 on failed.

char* getcwd	(	char *	buf,
		size_t	size
	)

this function is a POSIX compliant version, which will return current working directory.

Parameters:

buf	the returned current directory.
size	the buffer size.

Returns:: the returned current directory.

Functions

Function Documentation