_IONBF
if (setvbuf(fp, NULL, _IONBF, 0)) {
(void)setvbuf(fp, buf, buf ? _IOFBF : _IONBF, BUFSIZ);
(void)setvbuf(fp, buf, buf ? _IOFBF : _IONBF, (size_t)size);
if (mode != _IONBF)
if (mode == _IONBF)
setvbuf(stdout, NULL, _IONBF, 0);
setvbuf(stdout, NULL, _IONBF, 0);
setvbuf(stdout, NULL, _IONBF, 0);
setvbuf(stdout, NULL, _IONBF, 0);
setvbuf(stdout, NULL, _IONBF, 0);
case 0: return _IONBF;
opts.btype = _IONBF;
{ "IONBF", _IONBF },
setvbuf(stdout, NULL, _IONBF, 0);
setvbuf(stderr, NULL, _IONBF, 0);
setvbuf(stdout, NULL, _IONBF, 0);
setvbuf(stderr, NULL, _IONBF, 0);
setvbuf(stdout, NULL, _IONBF, 0);
setvbuf(stderr, NULL, _IONBF, 0);
if (setvbuf(stdout, NULL, _IONBF, 0) != 0)
setvbuf(stdout, NULL, _IONBF, 0);
setvbuf(opts.debug_file, NULL, _IONBF, 0);
#ifdef _IONBF
c = setvbuf(stdout, NULL, _IONBF, 0);
setvbuf(stdout, NULL, _IONBF, 0);