class IO::FileDescriptor

Overview

An IO over a file descriptor.

Included Modules

Direct Known Subclasses

Defined in:

io/console.cr
io/file_descriptor.cr

Constructors

Class Method Summary

Instance Method Summary

Macro Summary

Instance methods inherited from module IO::Buffered

close : Nil close, flush flush, flush_on_newline=(flush_on_newline) flush_on_newline=, flush_on_newline? flush_on_newline?, peek : Bytes? peek, read(slice : Bytes) read, read_buffering=(read_buffering) read_buffering=, read_buffering? read_buffering?, rewind rewind, sync=(sync) sync=, sync? sync?, unbuffered_close unbuffered_close, unbuffered_flush unbuffered_flush, unbuffered_read(slice : Bytes) unbuffered_read, unbuffered_rewind unbuffered_rewind, unbuffered_write(slice : Bytes) unbuffered_write, write(slice : Bytes) write

Class methods inherited from module Crystal::System::FileDescriptor

fcntl(fd, cmd, arg = 0) fcntl, pipe(read_blocking, write_blocking) pipe, pread(fd, buffer, offset) pread

Instance methods inherited from module IO::Syscall

read_syscall_helper(slice : Bytes, errno_msg : String, &block) : Int32 read_syscall_helper, read_timeout : Time::Span? read_timeout, read_timeout=(read_timeout : Number) : Number
read_timeout=(timeout : Time::Span?) : Time::Span?
read_timeout=
, write_syscall_helper(slice : Bytes, errno_msg : String, &block) : Nil write_syscall_helper, write_timeout : Time::Span? write_timeout, write_timeout=(write_timeout : Number) : Number
write_timeout=(timeout : Time::Span?) : Time::Span?
write_timeout=

Instance methods inherited from class IO

<<(obj) : self <<, close close, closed? closed?, each_byte(&block) : Nil
each_byte
each_byte
, each_char(&block) : Nil
each_char
each_char
, each_line(*args, **options, &block) : Nil
each_line(*args, **options)
each_line
, encoding : String encoding, flush flush, gets(delimiter : Char, limit : Int, chomp = false) : String?
gets(delimiter : Char, chomp = false) : String?
gets(chomp = true) : String?
gets(limit : Int, chomp = false) : String?
gets(delimiter : String, chomp = false) : String?
gets
, gets_to_end : String gets_to_end, peek : Bytes? peek, pos pos, pos=(value) pos=, print(*objects : UNDERSCORE) : Nil
print(obj) : Nil
print
, printf(format_string, *args) : Nil
printf(format_string, args : Array | Tuple) : Nil
printf
, puts(*objects : UNDERSCORE) : Nil
puts : Nil
puts(obj) : Nil
puts(string : String) : Nil
puts
, read(slice : Bytes) read, read_at(offset, bytesize, &block) read_at, read_byte : UInt8? read_byte, read_bytes(type, format : IO::ByteFormat = IO::ByteFormat::SystemEndian) read_bytes, read_char : Char? read_char, read_fully(slice : Bytes) read_fully, read_fully?(slice : Bytes) read_fully?, read_line(*args, **options) : String read_line, read_string(bytesize : Int) : String read_string, read_utf8(slice : Bytes) read_utf8, read_utf8_byte read_utf8_byte, rewind rewind, seek(offset, whence : Seek = Seek::Set) seek, set_encoding(encoding : String, invalid : Symbol? = nil) set_encoding, skip(bytes_count : Int) : Nil skip, skip_to_end : Nil skip_to_end, tell tell, tty? : Bool tty?, write(slice : Bytes) : Nil write, write_byte(byte : UInt8) write_byte, write_bytes(object, format : IO::ByteFormat = IO::ByteFormat::SystemEndian) write_bytes, write_utf8(slice : Bytes) write_utf8

Class methods inherited from class IO

copy(src, dst, limit : Int)
copy(src, dst)
copy
, pipe(read_blocking = false, write_blocking = false) : Tuple(IO::FileDescriptor, IO::FileDescriptor)
pipe(read_blocking = false, write_blocking = false, &block)
pipe

Instance methods inherited from class Reference

==(other : self)
==(other : JSON::Any)
==(other : YAML::Any)
==(other)
==
, dup dup, hash(hasher) hash, inspect(io : IO) : Nil inspect, object_id : UInt64 object_id, pretty_print(pp) : Nil pretty_print, same?(other : Reference)
same?(other : Nil)
same?
, to_s(io : IO) : Nil to_s

Constructor methods inherited from class Reference

new new

Instance methods inherited from class Object

!=(other) !=, !~(other) !~, ==(other) ==, ===(other : JSON::Any)
===(other : YAML::Any)
===(other)
===
, =~(other) =~, class class, dup dup, hash(hasher)
hash
hash
, inspect(io : IO)
inspect
inspect
, itself itself, not_nil! not_nil!, pretty_inspect(width = 79, newline = "\n", indent = 0) : String pretty_inspect, pretty_print(pp : PrettyPrint) : Nil pretty_print, tap(&block) tap, to_json(io : IO)
to_json
to_json
, to_pretty_json(indent : String = " ")
to_pretty_json(io : IO, indent : String = " ")
to_pretty_json
, to_s
to_s(io : IO)
to_s
, to_yaml(io : IO)
to_yaml
to_yaml
, try(&block) try, unsafe_as(type : T.class) forall T unsafe_as

Constructor methods inherited from class Object

from_json(string_or_io, root : String) : self
from_json(string_or_io) : self
from_json
, from_yaml(string_or_io : String | IO) : self from_yaml

Constructor Detail

def self.new(fd, blocking = false) #

[View source]

Class Method Detail

def self.fcntl(fd, cmd, arg = 0) #

[View source]

Instance Method Detail

def blocking #

[View source]
def blocking=(value) #

[View source]
def close_on_exec=(value : Bool) #

[View source]
def close_on_exec? #

[View source]
def closed? : Bool #

[View source]
def cooked(&block) #

Enables character processing for the duration of the given block. The so called cooked mode is the standard behavior of a terminal, doing line wise editing by the terminal and only sending the input to the program on a newline. Only call this when this IO is a TTY, such as a not redirected stdin.


[View source]
def cooked! #

Enables character processing for this IO. The so called cooked mode is the standard behavior of a terminal, doing line wise editing by the terminal and only sending the input to the program on a newline. Only call this when this IO is a TTY, such as a not redirected stdin.


[View source]
def fcntl(cmd, arg = 0) #

[View source]
def fd : Int32 #

The raw file-descriptor. It is defined to be an Int, but its size is platform-specific.


[View source]
def finalize #

[View source]
def info #

[View source]
def inspect(io) #

[View source]
def noecho(&block) #

Turns off character echoing for the duration of the given block. This will prevent displaying back to the user what they enter on the terminal. Only call this when this IO is a TTY, such as a not redirected stdin.

print "Enter password: "
password = STDIN.noecho &.gets.try &.chomp
puts

[View source]
def noecho! #

Turns off character echoing for this IO. This will prevent displaying back to the user what they enter on the terminal. Only call this when this IO is a TTY, such as a not redirected stdin.


[View source]
def pos #

Returns the current position (in bytes) in this IO.

File.write("testfile", "hello")

file = File.new("testfile")
file.pos     # => 0
file.gets(2) # => "he"
file.pos     # => 2

[View source]
def pos=(value) #

Sets the current position (in bytes) in this IO.

File.write("testfile", "hello")

file = File.new("testfile")
file.pos = 3
file.gets_to_end # => "lo"

[View source]
def pretty_print(pp) #

[View source]
def raw(&block) #

Enables raw mode for the duration of the given block. In raw mode every keypress is directly sent to the program, no interpretation is done by the terminal. Only call this when this IO is a TTY, such as a not redirected stdin.


[View source]
def raw! #

Enables raw mode for this IO. In raw mode every keypress is directly sent to the program, no interpretation is done by the terminal. Only call this when this IO is a TTY, such as a not redirected stdin.


[View source]
def reopen(other : IO::FileDescriptor) #

[View source]
def seek(offset, whence : Seek = Seek::Set) #

Seeks to a given offset (in bytes) according to the whence argument. Returns self.

File.write("testfile", "abc")

file = File.new("testfile")
file.gets(3) # => "abc"
file.seek(1, IO::Seek::Set)
file.gets(2) # => "bc"
file.seek(-1, IO::Seek::Current)
file.gets(1) # => "c"

[View source]
def seek(offset, whence : Seek = Seek::Set, &block) #

Same as #seek but yields to the block after seeking and eventually seeks back to the original position when the block returns.


[View source]
def tty? #

[View source]

Macro Detail

macro cooked_from_tc_mode! #

[View source]
macro noecho_from_tc_mode! #

[View source]
macro raw_from_tc_mode! #

[View source]