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31 lines
373 B
C
31 lines
373 B
C
/* See LICENSE file for copyright and license details. */
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#include <stdio.h>
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#include <unistd.h>
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#include "util.h"
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static void
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usage(void)
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{
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eprintf("usage: %s\n", argv0);
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}
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int
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main(int argc, char *argv[])
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{
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char *tty;
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ARGBEGIN {
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default:
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usage();
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} ARGEND;
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if (argc)
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usage();
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tty = ttyname(STDIN_FILENO);
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puts(tty ? tty : "not a tty");
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return !tty;
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}
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