close_read()
public
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static VALUE
strio_close_read(VALUE self)
{
struct StringIO *ptr = StringIO(self);
if (!(ptr->flags & FMODE_READABLE)) {
rb_raise(rb_eIOError, "closing non-duplex IO for reading");
}
RBASIC(self)->flags &= ~STRIO_READABLE;
return Qnil;
}