close_write()
public
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static VALUE
strio_close_write(VALUE self)
{
struct StringIO *ptr = StringIO(self);
if (!(ptr->flags & FMODE_WRITABLE)) {
rb_raise(rb_eIOError, "closing non-duplex IO for writing");
}
RBASIC(self)->flags &= ~STRIO_WRITABLE;
return Qnil;
}