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instance method

IO#closed?

() -> bool

closed? → true or false

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);
}

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

Example

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

Output:

Example

false
false
true

See also #close #close_on_exec= #clear_screen #close_on_exec? also in 4.0 · 3.4 · 3.3 · 3.2 · 3.1 · 3.0

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