Mercurial > hg > toybox
changeset 380:782859fadd20
Implement tty command.
author | Rob Landley <rob@landley.net> |
---|---|
date | Tue, 15 Nov 2011 00:57:45 -0600 |
parents | 74526fc22c25 |
children | 5d4dacab7be0 |
files | toys/tty.c |
diffstat | 1 files changed, 32 insertions(+), 0 deletions(-) [+] |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/toys/tty.c Tue Nov 15 00:57:45 2011 -0600 @@ -0,0 +1,32 @@ +/* vi: set sw=4 ts=4: + * + * tty.c - Show stdin's terminal name + * + * Copyright 2011 Rob Landley <rob@landley.net> + * + * See http://opengroup.org/onlinepubs/9699919799/utilities/tty.html + +USE_TTY(NEWTOY(tty, "s", TOYFLAG_USR|TOYFLAG_BIN)) + +config TTY + bool "tty" + default y + help + Show filename of terminal connected to stdin. + + Prints "not a tty" and exits with nonzero status if no terminal + is connected to stdin. + + -s silent mode +*/ + +#include "toys.h" + +void tty_main(void) +{ + char *tty = ttyname(0); + + if (!toys.optflags) puts(tty ? tty : "not a tty"); + + toys.exitval = !tty; +}