class Dir - RDoc Documentation

# class Dir

Objects of class `Dir` are directory streams representing directories in the underlying file system. They provide a variety of ways to list directories and their contents. See also `File`.

The directory used in these examples contains the two regular files (`config.h` and `main.rb`), the parent directory (`..`), and the directory itself (`.`).

### Public Class Methods

[](*args, base: nil, sort: true) click to toggle source

    Dir[ string [, string ...] [, base: path] [, sort: true] ] -> array

Equivalent to calling `Dir.glob([`string,…`], 0)`.

    # File dir.rb, line 42
    def self.[](*args, base: nil, sort: true)
      Primitive.dir_s_aref(args, base, sort)
    end

chdir( [ string] ) → 0 click to toggle source
chdir( [ string] ) {| path | block } → anObject

Changes the current working directory of the process to the given string. When called without an argument, changes the directory to the value of the environment variable `HOME`, or `LOGDIR`. `SystemCallError` (probably Errno::ENOENT) if the target directory does not exist.

If a block is given, it is passed the name of the new current directory, and the block is executed with that as the current directory. The original working directory is restored when the block exits. The return value of `chdir` is the value of the block. `chdir` blocks can be nested, but in a multi-threaded program an error will be raised if a thread attempts to open a `chdir` block while another thread has one open or a call to `chdir` without a block occurs inside a block passed to `chdir` (even in the same thread).

    Dir.chdir("/var/spool/mail")
    puts Dir.pwd
    Dir.chdir("/tmp") do
      puts Dir.pwd
      Dir.chdir("/usr") do
        puts Dir.pwd
      end
      puts Dir.pwd
    end
    puts Dir.pwd

produces:

    /var/spool/mail
    /tmp
    /usr
    /tmp
    /var/spool/mail

    static VALUE
    dir_s_chdir(int argc, VALUE *argv, VALUE obj)
    {
        VALUE path = Qnil;

        if (rb_check_arity(argc, 0, 1) == 1) {
            path = rb_str_encode_ospath(rb_get_path(argv[0]));
        }
        else {
            const char *dist = getenv("HOME");
            if (!dist) {
                dist = getenv("LOGDIR");
                if (!dist) rb_raise(rb_eArgError, "HOME/LOGDIR not set");
            }
            path = rb_str_new2(dist);
        }

        if (chdir_blocking > 0) {
            if (rb_thread_current() != chdir_thread)
                rb_raise(rb_eRuntimeError, "conflicting chdir during another chdir block");
            if (!rb_block_given_p())
                rb_warn("conflicting chdir during another chdir block");
        }

        if (rb_block_given_p()) {
            struct chdir_data args;

            args.old_path = rb_str_encode_ospath(rb_dir_getwd());
            args.new_path = path;
            args.done = FALSE;
            return rb_ensure(chdir_yield, (VALUE)&args, chdir_restore, (VALUE)&args);
        }
        else {
            char *p = RSTRING_PTR(path);
            int r = (int)(VALUE)rb_thread_call_without_gvl(nogvl_chdir, p,
                                                            RUBY_UBF_IO, 0);
            if (r < 0)
                rb_sys_fail_path(path);
        }

        return INT2FIX(0);
    }

children( dirname ) → array click to toggle source
children( dirname, encoding: enc ) → array

Returns an array containing all of the filenames except for “.” and “..” in the given directory. Will raise a `SystemCallError` if the named directory doesn't exist.

The optional encoding keyword argument specifies the encoding of the directory. If not specified, the filesystem encoding is used.

    Dir.children("testdir")   #=> ["config.h", "main.rb"]

    static VALUE
    dir_s_children(int argc, VALUE *argv, VALUE io)
    {
        VALUE dir;

        dir = dir_open_dir(argc, argv);
        return rb_ensure(dir_collect_children, dir, dir_close, dir);
    }

chroot( string ) → 0 click to toggle source

Changes this process's idea of the file system root. Only a privileged process may make this call. Not available on all platforms. On Unix systems, see `chroot(2)` for more information.

    static VALUE
    dir_s_chroot(VALUE dir, VALUE path)
    {
        path = check_dirname(path);
        if (chroot(RSTRING_PTR(path)) == -1)
            rb_sys_fail_path(path);

        return INT2FIX(0);
    }

delete( string ) → 0 click to toggle source
rmdir( string ) → 0
unlink( string ) → 0

Deletes the named directory. Raises a subclass of `SystemCallError` if the directory isn't empty.

    static VALUE
    dir_s_rmdir(VALUE obj, VALUE dir)
    {
        const char *p;
        int r;

        dir = check_dirname(dir);
        p = RSTRING_PTR(dir);
        r = (int)(VALUE)rb_thread_call_without_gvl(nogvl_rmdir, (void *)p, RUBY_UBF_IO, 0);
        if (r < 0)
            rb_sys_fail_path(dir);

        return INT2FIX(0);
    }

each_child( dirname ) {| filename | block } → nil click to toggle source
each_child( dirname, encoding: enc ) {| filename | block } → nil
each_child( dirname ) → an_enumerator
each_child( dirname, encoding: enc ) → an_enumerator

Calls the block once for each entry except for “.” and “..” in the named directory, passing the filename of each entry as a parameter to the block.

If no block is given, an enumerator is returned instead.

    Dir.each_child("testdir") {|x| puts "Got #{x}" }

produces:

    Got config.h
    Got main.rb

    static VALUE
    dir_s_each_child(int argc, VALUE *argv, VALUE io)
    {
        VALUE dir;

        RETURN_ENUMERATOR(io, argc, argv);
        dir = dir_open_dir(argc, argv);
        rb_ensure(dir_each_child, dir, dir_close, dir);
        return Qnil;
    }

empty?(path_name) → true or false click to toggle source

Returns `true` if the named file is an empty directory, `false` if it is not a directory or non-empty.

    static VALUE
    rb_dir_s_empty_p(VALUE obj, VALUE dirname)
    {
        VALUE result, orig;
        const char *path;
        enum {false_on_notdir = 1};

        FilePathValue(dirname);
        orig = rb_str_dup_frozen(dirname);
        dirname = rb_str_encode_ospath(dirname);
        dirname = rb_str_dup_frozen(dirname);
        path = RSTRING_PTR(dirname);

    #if defined HAVE_GETATTRLIST && defined ATTR_DIR_ENTRYCOUNT
        {
            u_int32_t attrbuf[SIZEUP32(fsobj_tag_t)];
            struct attrlist al = {ATTR_BIT_MAP_COUNT, 0, ATTR_CMN_OBJTAG,};
            if (getattrlist(path, &al, attrbuf, sizeof(attrbuf), 0) != 0)
                rb_sys_fail_path(orig);
            if (*(const fsobj_tag_t *)(attrbuf+1) == VT_HFS) {
                al.commonattr = 0;
                al.dirattr = ATTR_DIR_ENTRYCOUNT;
                if (getattrlist(path, &al, attrbuf, sizeof(attrbuf), 0) == 0) {
                    if (attrbuf[0] >= 2 * sizeof(u_int32_t))
                        return attrbuf[1] ? Qfalse : Qtrue;
                    if (false_on_notdir) return Qfalse;
                }
                rb_sys_fail_path(orig);
            }
        }
    #endif

        result = (VALUE)rb_thread_call_without_gvl(nogvl_dir_empty_p, (void *)path,
                                                RUBY_UBF_IO, 0);
        if (result == Qundef) {
            rb_sys_fail_path(orig);
        }
        return result;
    }

entries( dirname ) → array click to toggle source
entries( dirname, encoding: enc ) → array

Returns an array containing all of the filenames in the given directory. Will raise a `SystemCallError` if the named directory doesn't exist.

The optional encoding keyword argument specifies the encoding of the directory. If not specified, the filesystem encoding is used.

    Dir.entries("testdir")   #=> [".", "..", "config.h", "main.rb"]

    static VALUE
    dir_entries(int argc, VALUE *argv, VALUE io)
    {
        VALUE dir;

        dir = dir_open_dir(argc, argv);
        return rb_ensure(dir_collect, dir, dir_close, dir);
    }

exist?(file_name) → true or false click to toggle source

Returns `true` if the named file is a directory, `false` otherwise.

    VALUE
    rb_file_directory_p(void)
    {
    }

foreach( dirname ) {| filename | block } → nil click to toggle source
foreach( dirname, encoding: enc ) {| filename | block } → nil
foreach( dirname ) → an_enumerator
foreach( dirname, encoding: enc ) → an_enumerator

Calls the block once for each entry in the named directory, passing the filename of each entry as a parameter to the block.

If no block is given, an enumerator is returned instead.

    Dir.foreach("testdir") {|x| puts "Got #{x}" }

produces:

    Got .
    Got ..
    Got config.h
    Got main.rb

    static VALUE
    dir_foreach(int argc, VALUE *argv, VALUE io)
    {
        VALUE dir;

        RETURN_ENUMERATOR(io, argc, argv);
        dir = dir_open_dir(argc, argv);
        rb_ensure(dir_each, dir, dir_close, dir);
        return Qnil;
    }

getwd → string click to toggle source
pwd → string

Returns the path to the current working directory of this process as a string.

    Dir.chdir("/tmp")   #=> 0
    Dir.getwd           #=> "/tmp"
    Dir.pwd             #=> "/tmp"

    static VALUE
    dir_s_getwd(VALUE dir)
    {
        return rb_dir_getwd();
    }

glob(pattern, _flags = 0, flags: _flags, base: nil, sort: true) click to toggle source

    Dir.glob( pattern, [flags], [base: path] [, sort: true] )                       -> array
    Dir.glob( pattern, [flags], [base: path] [, sort: true] ) { |filename| block }  -> nil

Expands `pattern`, which is a pattern string or an `Array` of pattern strings, and returns an array containing the matching filenames. If a block is given, calls the block once for each matching filename, passing the filename as a parameter to the block.

The optional `base` keyword argument specifies the base directory for interpreting relative pathnames instead of the current working directory. As the results are not prefixed with the base directory name in this case, you will need to prepend the base directory name if you want real paths.

The results which matched single wildcard or character set are sorted in binary ascending order, unless false is given as the optional `sort` keyword argument. The order of an `Array` of pattern strings and braces are preserved.

Note that the pattern is not a regexp, it's closer to a shell glob. See `File::fnmatch` for the meaning of the `flags` parameter. Case sensitivity depends on your system (File::FNM_CASEFOLD is ignored).

`*`

  Matches any file. Can be restricted by other values in the glob. Equivalent to `/ .* /mx` in regexp.

  `*`

    Matches all files

  `c*`

    Matches all files beginning with `c`

  `*c`

    Matches all files ending with `c`

  `*c*`

    Match all files that have `c` in them (including at the beginning or end).

  Note, this will not match Unix-like hidden files (dotfiles). In order to include those in the match results, you must use the File::FNM_DOTMATCH flag or something like `"{*,.*}"`.

`**`

  Matches directories recursively if followed by `/`. If this path segment contains any other characters, it is the same as the usual `*`.

`?`

  Matches any one character. Equivalent to `/.{1}/` in regexp.

`[set]`

  Matches any one character in `set`. Behaves exactly like character sets in `Regexp`, including set negation (`[^a-z]`).

`{p,q}`

  Matches either literal `p` or literal `q`. Equivalent to pattern alternation in regexp.

  Matching literals may be more than one character in length. More than two literals may be specified.

`\`

  Escapes the next metacharacter.

  Note that this means you cannot use backslash on windows as part of a glob, i.e. `Dir["c:\foo*"]` will not work, use `Dir["c:/foo*"]` instead.

Examples:

    Dir["config.?"]                     #=> ["config.h"]
    Dir.glob("config.?")                #=> ["config.h"]
    Dir.glob("*.[a-z][a-z]")            #=> ["main.rb"]
    Dir.glob("*.[^r]*")                 #=> ["config.h"]
    Dir.glob("*.{rb,h}")                #=> ["main.rb", "config.h"]
    Dir.glob("*")                       #=> ["config.h", "main.rb"]
    Dir.glob("*", File::FNM_DOTMATCH)   #=> [".", "..", "config.h", "main.rb"]
    Dir.glob(["*.rb", "*.h"])           #=> ["main.rb", "config.h"]

    Dir.glob("**/*.rb")                 #=> ["main.rb",
                                        #    "lib/song.rb",
                                        #    "lib/song/karaoke.rb"]

    Dir.glob("**/*.rb", base: "lib")    #=> ["song.rb",
                                        #    "song/karaoke.rb"]

    Dir.glob("**/lib")                  #=> ["lib"]

    Dir.glob("**/lib/**/*.rb")          #=> ["lib/song.rb",
                                        #    "lib/song/karaoke.rb"]

    Dir.glob("**/lib/*.rb")             #=> ["lib/song.rb"]

    # File dir.rb, line 133
    def self.glob(pattern, _flags = 0, flags: _flags, base: nil, sort: true)
      Primitive.dir_s_glob(pattern, flags, base, sort)
    end

home() → "/home/me" click to toggle source
home("root") → "/root"

Returns the home directory of the current user or the named user if given.

    static VALUE
    dir_s_home(int argc, VALUE *argv, VALUE obj)
    {
        VALUE user;
        const char *u = 0;

        rb_check_arity(argc, 0, 1);
        user = (argc > 0) ? argv[0] : Qnil;
        if (!NIL_P(user)) {
            SafeStringValue(user);
            rb_must_asciicompat(user);
            u = StringValueCStr(user);
            if (*u) {
                return rb_home_dir_of(user, rb_str_new(0, 0));
            }
        }
        return rb_default_home_dir(rb_str_new(0, 0));

    }

mkdir( string [, integer] ) → 0 click to toggle source

Makes a new directory named by string, with permissions specified by the optional parameter anInteger. The permissions may be modified by the value of `File::umask`, and are ignored on NT. Raises a `SystemCallError` if the directory cannot be created. See also the discussion of permissions in the class documentation for `File`.

    Dir.mkdir(File.join(Dir.home, ".foo"), 0700) #=> 0

    static VALUE
    dir_s_mkdir(int argc, VALUE *argv, VALUE obj)
    {
        struct mkdir_arg m;
        VALUE path, vmode;
        int r;

        if (rb_scan_args(argc, argv, "11", &path, &vmode) == 2) {
            m.mode = NUM2MODET(vmode);
        }
        else {
            m.mode = 0777;
        }

        path = check_dirname(path);
        m.path = RSTRING_PTR(path);
        r = (int)(VALUE)rb_thread_call_without_gvl(nogvl_mkdir, &m, RUBY_UBF_IO, 0);
        if (r < 0)
            rb_sys_fail_path(path);

        return INT2FIX(0);
    }

mktmpdir(prefix_suffix=nil, *rest, **options) { |dup| ... } click to toggle source

`Dir.mktmpdir` creates a temporary directory.

The directory is created with 0700 permission. Application should not change the permission to make the temporary directory accessible from other users.

The prefix and suffix of the name of the directory is specified by the optional first argument, prefix_suffix.

- If it is not specified or nil, “d” is used as the prefix and no suffix is used.

- If it is a string, it is used as the prefix and no suffix is used.

- If it is an array, first element is used as the prefix and second element is used as a suffix.

    Dir.mktmpdir {|dir| dir is ".../d..." }
    Dir.mktmpdir("foo") {|dir| dir is ".../foo..." }
    Dir.mktmpdir(["foo", "bar"]) {|dir| dir is ".../foo...bar" }

The directory is created under `Dir.tmpdir` or the optional second argument tmpdir if non-nil value is given.

    Dir.mktmpdir {|dir| dir is "#{Dir.tmpdir}/d..." }
    Dir.mktmpdir(nil, "/var/tmp") {|dir| dir is "/var/tmp/d..." }

If a block is given, it is yielded with the path of the directory. The directory and its contents are removed using `FileUtils.remove_entry` before `Dir.mktmpdir` returns. The value of the block is returned.

    Dir.mktmpdir {|dir|
      # use the directory...
      open("#{dir}/foo", "w") { ... }
    }

If a block is not given, The path of the directory is returned. In this case, `Dir.mktmpdir` doesn't remove the directory.

    dir = Dir.mktmpdir
    begin
      # use the directory...
      open("#{dir}/foo", "w") { ... }
    ensure
      # remove the directory.
      FileUtils.remove_entry dir
    end

    # File lib/tmpdir.rb, line 88
    def self.mktmpdir(prefix_suffix=nil, *rest, **options)
      base = nil
      path = Tmpname.create(prefix_suffix || "d", *rest, **options) {|path, _, _, d|
        base = d
        mkdir(path, 0700)
      }
      if block_given?
        begin
          yield path.dup
        ensure
          unless base
            stat = File.stat(File.dirname(path))
            if stat.world_writable? and !stat.sticky?
              raise ArgumentError, "parent directory is world writable but not sticky"
            end
          end
          FileUtils.remove_entry path
        end
      else
        path
      end
    end

new(name, encoding: nil) click to toggle source

    Dir.new( string ) -> aDir
    Dir.new( string, encoding: enc ) -> aDir

Returns a new directory object for the named directory.

The optional encoding keyword argument specifies the encoding of the directory. If not specified, the filesystem encoding is used.

    # File dir.rb, line 34
    def initialize(name, encoding: nil)
      Primitive.dir_initialize(name, encoding)
    end

open(name, encoding: nil) { |dir| ... } click to toggle source

    Dir.open( string ) -> aDir
    Dir.open( string, encoding: enc ) -> aDir
    Dir.open( string ) {| aDir | block } -> anObject
    Dir.open( string, encoding: enc ) {| aDir | block } -> anObject

The optional encoding keyword argument specifies the encoding of the directory. If not specified, the filesystem encoding is used.

With no block, `open` is a synonym for `Dir::new`. If a block is present, it is passed aDir as a parameter. The directory is closed at the end of the block, and `Dir::open` returns the value of the block.

    # File dir.rb, line 14
    def self.open(name, encoding: nil, &block)
      dir = Primitive.dir_s_open(name, encoding)
      if block
        begin
          yield dir
        ensure
          Primitive.dir_s_close(dir)
        end
      else
        dir
      end
    end

getwd → string click to toggle source
pwd → string

Returns the path to the current working directory of this process as a string.

    Dir.chdir("/tmp")   #=> 0
    Dir.getwd           #=> "/tmp"
    Dir.pwd             #=> "/tmp"

    static VALUE
    dir_s_getwd(VALUE dir)
    {
        return rb_dir_getwd();
    }

delete( string ) → 0 click to toggle source
rmdir( string ) → 0
unlink( string ) → 0

Deletes the named directory. Raises a subclass of `SystemCallError` if the directory isn't empty.

    static VALUE
    dir_s_rmdir(VALUE obj, VALUE dir)
    {
        const char *p;
        int r;

        dir = check_dirname(dir);
        p = RSTRING_PTR(dir);
        r = (int)(VALUE)rb_thread_call_without_gvl(nogvl_rmdir, (void *)p, RUBY_UBF_IO, 0);
        if (r < 0)
            rb_sys_fail_path(dir);

        return INT2FIX(0);
    }

tmpdir() click to toggle source

Returns the operating system's temporary file path.

    # File lib/tmpdir.rb, line 21
    def self.tmpdir
      tmp = nil
      ['TMPDIR', 'TMP', 'TEMP', ['system temporary path', @@systmpdir], ['/tmp']*2, ['.']*2].each do |name, dir = ENV[name]|
        next if !dir
        dir = File.expand_path(dir)
        stat = File.stat(dir) rescue next
        case
        when !stat.directory?
          warn "#{name} is not a directory: #{dir}"
        when !stat.writable?
          warn "#{name} is not writable: #{dir}"
        when stat.world_writable? && !stat.sticky?
          warn "#{name} is world-writable: #{dir}"
        else
          tmp = dir
          break
        end
      end
      raise ArgumentError, "could not find a temporary directory" unless tmp
      tmp
    end

delete( string ) → 0 click to toggle source
rmdir( string ) → 0
unlink( string ) → 0

Deletes the named directory. Raises a subclass of `SystemCallError` if the directory isn't empty.

    static VALUE
    dir_s_rmdir(VALUE obj, VALUE dir)
    {
        const char *p;
        int r;

        dir = check_dirname(dir);
        p = RSTRING_PTR(dir);
        r = (int)(VALUE)rb_thread_call_without_gvl(nogvl_rmdir, (void *)p, RUBY_UBF_IO, 0);
        if (r < 0)
            rb_sys_fail_path(dir);

        return INT2FIX(0);
    }

### Public Instance Methods

children → array click to toggle source

Returns an array containing all of the filenames except for “.” and “..” in this directory.

    d = Dir.new("testdir")
    d.children   #=> ["config.h", "main.rb"]

    static VALUE
    dir_collect_children(VALUE dir)
    {
        VALUE ary = rb_ary_new();
        dir_each_entry(dir, rb_ary_push, ary, TRUE);
        return ary;
    }

close → nil click to toggle source

Closes the directory stream. Calling this method on closed `Dir` object is ignored since Ruby 2.3.

    d = Dir.new("testdir")
    d.close   #=> nil

    static VALUE
    dir_close(VALUE dir)
    {
        struct dir_data *dirp;

        dirp = dir_get(dir);
        if (!dirp->dir) return Qnil;
        closedir(dirp->dir);
        dirp->dir = NULL;

        return Qnil;
    }

each { |filename| block } → dir click to toggle source
each → an_enumerator

Calls the block once for each entry in this directory, passing the filename of each entry as a parameter to the block.

If no block is given, an enumerator is returned instead.

    d = Dir.new("testdir")
    d.each  {|x| puts "Got #{x}" }

produces:

    Got .
    Got ..
    Got config.h
    Got main.rb

    static VALUE
    dir_each(VALUE dir)
    {
        RETURN_ENUMERATOR(dir, 0, 0);
        return dir_each_entry(dir, dir_yield, Qnil, FALSE);
    }

each_child {| filename | block } → dir click to toggle source
each_child → an_enumerator

Calls the block once for each entry except for “.” and “..” in this directory, passing the filename of each entry as a parameter to the block.

If no block is given, an enumerator is returned instead.

    d = Dir.new("testdir")
    d.each_child  {|x| puts "Got #{x}" }

produces:

    Got config.h
    Got main.rb

    static VALUE
    dir_each_child_m(VALUE dir)
    {
        RETURN_ENUMERATOR(dir, 0, 0);
        return dir_each_entry(dir, dir_yield, Qnil, TRUE);
    }

fileno → integer click to toggle source

Returns the file descriptor used in dir.

    d = Dir.new("..")
    d.fileno   #=> 8

This method uses dirfd() function defined by POSIX 2008. `NotImplementedError` is raised on other platforms, such as Windows, which doesn't provide the function.

    static VALUE
    dir_fileno(VALUE dir)
    {
        struct dir_data *dirp;
        int fd;

        GetDIR(dir, dirp);
        fd = dirfd(dirp->dir);
        if (fd == -1)
            rb_sys_fail("dirfd");
        return INT2NUM(fd);
    }

inspect → string click to toggle source

Return a string describing this `Dir` object.

    static VALUE
    dir_inspect(VALUE dir)
    {
        struct dir_data *dirp;

        TypedData_Get_Struct(dir, struct dir_data, &dir_data_type, dirp);
        if (!NIL_P(dirp->path)) {
            VALUE str = rb_str_new_cstr("#<");
            rb_str_append(str, rb_class_name(CLASS_OF(dir)));
            rb_str_cat2(str, ":");
            rb_str_append(str, dirp->path);
            rb_str_cat2(str, ">");
            return str;
        }
        return rb_funcallv(dir, idTo_s, 0, 0);
    }

path → string or nil click to toggle source

Returns the path parameter passed to dir's constructor.

    d = Dir.new("..")
    d.path   #=> ".."

    static VALUE
    dir_path(VALUE dir)
    {
        struct dir_data *dirp;

        TypedData_Get_Struct(dir, struct dir_data, &dir_data_type, dirp);
        if (NIL_P(dirp->path)) return Qnil;
        return rb_str_dup(dirp->path);
    }

Also aliased as: to_path
pos → integer

Returns the current position in dir. See also `Dir#seek`.

    d = Dir.new("testdir")
    d.tell   #=> 0
    d.read   #=> "."
    d.tell   #=> 12

Alias for: tell
pos = integer → integer click to toggle source

Synonym for `Dir#seek`, but returns the position parameter.

    d = Dir.new("testdir")   #=> #<Dir:0x401b3c40>
    d.read                   #=> "."
    i = d.pos                #=> 12
    d.read                   #=> ".."
    d.pos = i                #=> 12
    d.read                   #=> ".."

    static VALUE
    dir_set_pos(VALUE dir, VALUE pos)
    {
        dir_seek(dir, pos);
        return pos;
    }

read → string or nil click to toggle source

Reads the next entry from dir and returns it as a string. Returns `nil` at the end of the stream.

    d = Dir.new("testdir")
    d.read   #=> "."
    d.read   #=> ".."
    d.read   #=> "config.h"

    static VALUE
    dir_read(VALUE dir)
    {
        struct dir_data *dirp;
        struct dirent *dp;

        GetDIR(dir, dirp);
        errno = 0;
        if ((dp = READDIR(dirp->dir, dirp->enc)) != NULL) {
            return rb_external_str_new_with_enc(dp->d_name, NAMLEN(dp), dirp->enc);
        }
        else {
            int e = errno;
            if (e != 0) rb_syserr_fail(e, 0);
            return Qnil;           /* end of stream */
        }
    }

rewind → dir click to toggle source

Repositions dir to the first entry.

    d = Dir.new("testdir")
    d.read     #=> "."
    d.rewind   #=> #<Dir:0x401b3fb0>
    d.read     #=> "."

    static VALUE
    dir_rewind(VALUE dir)
    {
        struct dir_data *dirp;

        GetDIR(dir, dirp);
        rewinddir(dirp->dir);
        return dir;
    }

seek( integer ) → dir click to toggle source

Seeks to a particular location in dir. integer must be a value returned by `Dir#tell`.

    d = Dir.new("testdir")   #=> #<Dir:0x401b3c40>
    d.read                   #=> "."
    i = d.tell               #=> 12
    d.read                   #=> ".."
    d.seek(i)                #=> #<Dir:0x401b3c40>
    d.read                   #=> ".."

    static VALUE
    dir_seek(VALUE dir, VALUE pos)
    {
        struct dir_data *dirp;
        long p = NUM2LONG(pos);

        GetDIR(dir, dirp);
        seekdir(dirp->dir, p);
        return dir;
    }

tell → integer click to toggle source

Returns the current position in dir. See also `Dir#seek`.

    d = Dir.new("testdir")
    d.tell   #=> 0
    d.read   #=> "."
    d.tell   #=> 12

    static VALUE
    dir_tell(VALUE dir)
    {
        struct dir_data *dirp;
        long pos;

        GetDIR(dir, dirp);
        pos = telldir(dirp->dir);
        return rb_int2inum(pos);
    }

Also aliased as: pos
to_path → string or nil

Returns the path parameter passed to dir's constructor.

    d = Dir.new("..")
    d.path   #=> ".."

Alias for: path