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[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * tty implementation for busybox
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| 4 | *
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| 5 | * Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
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| 6 | *
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[1765] | 7 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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[821] | 8 | */
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| 9 |
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| 10 | /* BB_AUDIT SUSv3 compliant */
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| 11 | /* http://www.opengroup.org/onlinepubs/007904975/utilities/tty.html */
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| 12 |
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[1765] | 13 | #include "libbb.h"
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[821] | 14 |
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[1765] | 15 | int tty_main(int argc, char **argv);
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[821] | 16 | int tty_main(int argc, char **argv)
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| 17 | {
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| 18 | const char *s;
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[1765] | 19 | USE_INCLUDE_SUSv2(int silent;) /* Note: No longer relevant in SUSv3. */
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[821] | 20 | int retval;
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| 21 |
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[1765] | 22 | xfunc_error_retval = 2; /* SUSv3 requires > 1 for error. */
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[821] | 23 |
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[1765] | 24 | USE_INCLUDE_SUSv2(silent = getopt32(argv, "s");)
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[821] | 25 |
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| 26 | /* gnu tty outputs a warning that it is ignoring all args. */
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| 27 | bb_warn_ignoring_args(argc - optind);
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| 28 |
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| 29 | retval = 0;
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| 30 |
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[1765] | 31 | s = ttyname(0);
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| 32 | if (s == NULL) {
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[821] | 33 | /* According to SUSv3, ttyname can on fail with EBADF or ENOTTY.
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| 34 | * We know the file descriptor is good, so failure means not a tty. */
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| 35 | s = "not a tty";
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| 36 | retval = 1;
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| 37 | }
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[1765] | 38 | USE_INCLUDE_SUSv2(if (!silent) puts(s);)
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| 39 | SKIP_INCLUDE_SUSv2(puts(s);)
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[821] | 40 |
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[1765] | 41 | fflush_stdout_and_exit(retval);
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[821] | 42 | }
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