sysread

/*
 * call-seq:
 *   strio.sysread(integer[, outbuf])    -> string
 *
 * Similar to #read, but raises +EOFError+ at end of string instead of
 * returning +nil+, as well as IO#sysread does.
 */
static VALUE
strio_sysread(argc, argv, self)
    int argc;
    VALUE *argv;
    VALUE self;
{
    VALUE val = strio_read(argc, argv, self);
    if (NIL_P(val) || RSTRING(val)->len == 0) {
        rb_eof_error();
    }
    return val;
}