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# Files and Directories [POSIX Section 5]

## Functions Implemented

    DIR *opendir( const char *dirname );
    struct dirent *readdir( DIR *dirp );
    int readdir_r( DIR *dirp, struct dirent *entry,
                   struct dirent **result );
    void rewinddir( DIR *dirp );
    int closedir( DIR *dirp );
    int chdir( const char *path );
    char *getcwd( char *buf, size_t size );
    int open( const char * path , int oflag , ... );
    int creat( const char * path, mode_t mode );
    int link( const char *existing, const char *new );
    int mkdir( const char *path, mode_t mode );
    int unlink( const char *path );
    int rmdir( const char *path );
    int rename( const char *old, const char *new );
    int stat( const char *path, struct stat *buf );
    int fstat( int fd, struct stat *buf );
    int access( const char *path, int amode );
    long pathconf(const char *path, int name);
    long fpathconf(int fd, int name);

## Functions Omitted

    mode_t umask( mode_t cmask );
    int mkfifo( const char *path, mode_t mode );
    int chmod( const char *path, mode_t mode );			// TBA
    int fchmod( int fd, mode_t mode );				// TBA
    int chown( const char *path, uid_t owner, gid_t group );
    int utime( const char *path, const struct utimbuf *times );	// TBA
    int ftruncate( int fd, off_t length );                          // TBA

## Notes

- If a call to `open()` or `creat()` supplies the third _mode_ parameter, it will currently be ignored.

- Most of the functionality of these functions depends on the underlying filesystem.

- Currently access() only checks the F_OK mode explicitly, the others are all assumed to be true by default.

- The maximum number of open files allowed is supplied by the CYGNUM_FILEIO_NFILE option. The maximum number of file descriptors is supplied by the CYGNUM_FILEIO_NFD option.

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