1 /* tty.c - Show stdin's terminal name 2 * 3 * Copyright 2011 Rob Landley <rob@landley.net> 4 * 5 * See http://opengroup.org/onlinepubs/9699919799/utilities/tty.html 6 7 USE_TTY(NEWTOY(tty, "s", TOYFLAG_USR|TOYFLAG_BIN)) 8 9 config TTY 10 bool "tty" 11 default y 12 help 13 usage: tty [-s] 14 15 Show filename of terminal connected to stdin. If none print "not a tty" 16 and exit with nonzero status. 17 18 -s Silent, exit code only 19 */ 20 21 #include "toys.h" 22 tty_main(void)23void tty_main(void) 24 { 25 char *tty = ttyname(0); 26 27 toys.exitval = !tty; 28 if (!toys.optflags) puts(tty ? : "not a tty"); 29 } 30