Method: IO#closed?

Defined in:
io.c

#closed? ⇒ Boolean

Returns true if the stream is closed for both reading and writing, false otherwise. See Open and Closed Streams.

IO.popen('ruby', 'r+') do |pipe|
  puts pipe.closed?
  pipe.close_read
  puts pipe.closed?
  pipe.close_write
  puts pipe.closed?
end

Output:

false
false
true

Related: IO#close_read, IO#close_write, IO#close.

Returns:

  • (Boolean) 

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# File 'io.c', line 5865

VALUE
rb_io_closed_p(VALUE io)
{
    rb_io_t *fptr;
    VALUE write_io;
    rb_io_t *write_fptr;

    write_io = GetWriteIO(io);
    if (io != write_io) {
        write_fptr = RFILE(write_io)->fptr;
        if (write_fptr && 0 <= write_fptr->fd) {
            return Qfalse;
        }
    }

    fptr = rb_io_get_fptr(io);
    return RBOOL(0 > fptr->fd);
}