/* vi: set sw=4 ts=4: */ /* * tty implementation for busybox * * Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org> * * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. */ /* BB_AUDIT SUSv3 compliant */ /* http://www.opengroup.org/onlinepubs/007904975/utilities/tty.html */ #include "libbb.h" int tty_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; int tty_main(int argc, char **argv SKIP_INCLUDE_SUSv2(UNUSED_PARAM)) { const char *s; USE_INCLUDE_SUSv2(int silent;) /* Note: No longer relevant in SUSv3. */ int retval; xfunc_error_retval = 2; /* SUSv3 requires > 1 for error. */ USE_INCLUDE_SUSv2(silent = getopt32(argv, "s");) USE_INCLUDE_SUSv2(argc -= optind;) SKIP_INCLUDE_SUSv2(argc -= 1;) /* gnu tty outputs a warning that it is ignoring all args. */ bb_warn_ignoring_args(argc); retval = 0; s = xmalloc_ttyname(0); if (s == NULL) { /* According to SUSv3, ttyname can fail with EBADF or ENOTTY. * We know the file descriptor is good, so failure means not a tty. */ s = "not a tty"; retval = 1; } USE_INCLUDE_SUSv2(if (!silent) puts(s);) SKIP_INCLUDE_SUSv2(puts(s);) fflush_stdout_and_exit(retval); }