_IONBF
setvbuf(stdin, 0, _IONBF, 0);
setvbuf(stdout, 0, _IONBF, 0);
setvbuf(stderr, 0, _IONBF, 0);
setvbuf(stderr, NULL, _IONBF, 0);
(void) setvbuf (stdout, (char *)NULL, _IONBF, 0);
if (setvbuf(fp, NULL, _IONBF, 0))
setvbuf(stdin, 0, _IONBF, 0);
setvbuf(stdout, NULL, _IONBF, 0);
setvbuf(f, 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)
_nonblock_eagain(_IONBF);
mode = _IONBF;
setvbuf(stdout, NULL, _IONBF, 0);
setvbuf(config.log, NULL, _IONBF, 0);
setvbuf(stdin, NULL, _IONBF, 0);
ATF_REQUIRE_EQ(0, setvbuf(pipestream, NULL, _IONBF, 0));
setvbuf(stdin, 0, _IONBF, 0);
setvbuf(stdout, 0, _IONBF, 0);
if(setvbuf(stdout, NULL, _IONBF, 0) != 0)
setvbuf(sockfp, NULL, _IONBF, 0);
setvbuf(stdin, NULL, _IONBF, 0);
setvbuf(out, (char *)NULL, _IONBF, (size_t)0);