From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jonathan =?utf-8?Q?Neusch=C3=A4fer?= <j.neuschaefer@gmx.net>
Subject: Re: [PATCH] sparse: Reduce 'test-suite' run output
Date: Sat, 27 Aug 2011 13:39:59 +0200
Message-ID: <20110827113959.GA15022@debian.debian>
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To: Pekka Enberg <penberg@kernel.org>
Cc: Christopher Li <sparse@chrisli.org>, linux-sparse@vger.kernel.org, Linus Torvalds <torvalds@linux-foundation.org>

On Sat, Aug 27, 2011 at 11:13:17AM +0300, Pekka Enberg wrote:
> On Fri, 26 Aug 2011, Christopher Li wrote:
>=20
> >On Fri, Aug 26, 2011 at 6:50 AM, Pekka Enberg <penberg@kernel.org> w=
rote:
> >>There's more than 100 tests in the validation test suite. That make=
s it
> >>cumbersome to notice test breakage in because the results don't fit=
 on single
> >>page.
> >
> >Looks good in a terminal. But if the output is piped to a file, it w=
ill be hard
> >to read that file. We shouldn't do it for a non-terminal output.
>=20
> Right. How can I check if we're outputting to non-terminal?

You probably need a C helper, like this:

#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <errno.h>

int main(int argc, char **argv)
{
	int fd, tmp;

	if (argc < 2) {
		printf("usage: %s fd\n", argv[0]);
		return EXIT_FAILURE;
	}

	errno =3D 0;
	fd =3D (int) strtol(argv[1], NULL, 10);
	if (errno =3D=3D ERANGE) {
		perror("bad fd");
		return EXIT_FAILURE;
	}

	tmp =3D isatty(fd);
	if (!tmp && errno =3D=3D EBADF)
		perror("");

	return tmp ? EXIT_SUCCESS : EXIT_FAILURE;
}

HTH,
	Jonathan Neusch=C3=A4fer
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