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stty fails with a non-obvious error message if it's run on a non-tty

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stream, such as a rsh or vi pipeline.

The error message is:
stty: TIOCGETD: Operation not supported

It's immediately obvious to the knowledgable hacker type, but not
exactly comforting to the user who's not native to unix.  It's
especially confusing if there's a stty command in their .cshrc and
it's showing up on rsh output.

(Fixes PR #bin/573)

Submitted by:	peter@haywire.dialix.com (Peter Wemm)
This commit is contained in:
Joerg Wunsch 1995-07-02 08:54:27 +00:00
parent d700586c3a
commit 37712f2a7b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=9384
1 changed files with 5 additions and 3 deletions
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8
bin/stty/stty.c
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@ -30,7 +30,7 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: stty.c,v 1.3 1995/04/29 15:00:34 bde Exp $
* $Id: stty.c,v 1.4 1995/05/30 00:07:28 rgrimes Exp $
*/
#ifndef lint
@ -95,10 +95,12 @@ main(argc, argv)
args: argc -= optind;
argv += optind;
if (tcgetattr(i.fd, &i.t) < 0) {
warn("tcgetattr: not running on a terminal");
exit(1);
}
if (ioctl(i.fd, TIOCGETD, &i.ldisc) < 0)
err(1, "TIOCGETD");
if (tcgetattr(i.fd, &i.t) < 0)
err(1, "tcgetattr");
if (ioctl(i.fd, TIOCGWINSZ, &i.win) < 0)
warn("TIOCGWINSZ: %s\n", strerror(errno));