1*da2e3ebdSchin /*********************************************************************** 2*da2e3ebdSchin * * 3*da2e3ebdSchin * This software is part of the ast package * 4*da2e3ebdSchin * Copyright (c) 1992-2007 AT&T Knowledge Ventures * 5*da2e3ebdSchin * and is licensed under the * 6*da2e3ebdSchin * Common Public License, Version 1.0 * 7*da2e3ebdSchin * by AT&T Knowledge Ventures * 8*da2e3ebdSchin * * 9*da2e3ebdSchin * A copy of the License is available at * 10*da2e3ebdSchin * http://www.opensource.org/licenses/cpl1.0.txt * 11*da2e3ebdSchin * (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) * 12*da2e3ebdSchin * * 13*da2e3ebdSchin * Information and Software Systems Research * 14*da2e3ebdSchin * AT&T Research * 15*da2e3ebdSchin * Florham Park NJ * 16*da2e3ebdSchin * * 17*da2e3ebdSchin * Glenn Fowler <gsf@research.att.com> * 18*da2e3ebdSchin * David Korn <dgk@research.att.com> * 19*da2e3ebdSchin * * 20*da2e3ebdSchin ***********************************************************************/ 21*da2e3ebdSchin #pragma prototyped 22*da2e3ebdSchin /* 23*da2e3ebdSchin * David Korn 24*da2e3ebdSchin * AT&T Bell Laboratories 25*da2e3ebdSchin * 26*da2e3ebdSchin * tty 27*da2e3ebdSchin */ 28*da2e3ebdSchin 29*da2e3ebdSchin static const char usage[] = 30*da2e3ebdSchin "[-?\n@(#)$Id: tty (AT&T Research) 2007-03-11 $\n]" 31*da2e3ebdSchin USAGE_LICENSE 32*da2e3ebdSchin "[+NAME?tty - write the name of the terminal to standard output]" 33*da2e3ebdSchin "[+DESCRIPTION?\btty\b writes the name of the terminal that is connected " 34*da2e3ebdSchin "to standard input onto standard output. If the standard input is not " 35*da2e3ebdSchin "a terminal, \"\bnot a tty\b\" will be written to standard output.]" 36*da2e3ebdSchin "[l:line-number?Write the synchronous line number of the terminal on a " 37*da2e3ebdSchin "separate line following the terminal name line. If the standard " 38*da2e3ebdSchin "input is not a synchronous terminal then " 39*da2e3ebdSchin "\"\bnot on an active synchronous line\b\" is written.]" 40*da2e3ebdSchin "[s:silent|quiet?Disable the terminal name line. Use \b[[ -t 0 ]]]]\b instead.]" 41*da2e3ebdSchin "[+EXIT STATUS?]{" 42*da2e3ebdSchin "[+0?Standard input is a tty.]" 43*da2e3ebdSchin "[+1?Standard input is not a tty.]" 44*da2e3ebdSchin "[+2?Invalid arguments.]" 45*da2e3ebdSchin "[+3?A an error occurred.]" 46*da2e3ebdSchin "}" 47*da2e3ebdSchin ; 48*da2e3ebdSchin 49*da2e3ebdSchin 50*da2e3ebdSchin #include <cmd.h> 51*da2e3ebdSchin 52*da2e3ebdSchin #if _mac_STWLINE 53*da2e3ebdSchin #include <sys/stermio.h> 54*da2e3ebdSchin #endif 55*da2e3ebdSchin 56*da2e3ebdSchin int 57*da2e3ebdSchin b_tty(int argc, char *argv[], void* context) 58*da2e3ebdSchin { 59*da2e3ebdSchin register int n,sflag=0,lflag=0; 60*da2e3ebdSchin register char *tty; 61*da2e3ebdSchin 62*da2e3ebdSchin cmdinit(argc, argv, context, ERROR_CATALOG, 0); 63*da2e3ebdSchin while (n = optget(argv, usage)) switch (n) 64*da2e3ebdSchin { 65*da2e3ebdSchin case 'l': 66*da2e3ebdSchin lflag++; 67*da2e3ebdSchin break; 68*da2e3ebdSchin case 's': 69*da2e3ebdSchin sflag++; 70*da2e3ebdSchin break; 71*da2e3ebdSchin case ':': 72*da2e3ebdSchin error(2, "%s", opt_info.arg); 73*da2e3ebdSchin break; 74*da2e3ebdSchin case '?': 75*da2e3ebdSchin error(ERROR_usage(2), "%s", opt_info.arg); 76*da2e3ebdSchin break; 77*da2e3ebdSchin } 78*da2e3ebdSchin if(error_info.errors) 79*da2e3ebdSchin error(ERROR_usage(2), "%s", optusage(NiL)); 80*da2e3ebdSchin if(!(tty=ttyname(0))) 81*da2e3ebdSchin { 82*da2e3ebdSchin tty = ERROR_translate(0, 0, 0, "not a tty"); 83*da2e3ebdSchin error_info.errors++; 84*da2e3ebdSchin } 85*da2e3ebdSchin if(!sflag) 86*da2e3ebdSchin sfputr(sfstdout,tty,'\n'); 87*da2e3ebdSchin #if _mac_STWLINE 88*da2e3ebdSchin if(lflag && (n = ioctl(0, STWLINE, 0)) >= 0) 89*da2e3ebdSchin error(ERROR_OUTPUT, 1, "synchronous line %d", n); 90*da2e3ebdSchin else 91*da2e3ebdSchin #endif 92*da2e3ebdSchin error(ERROR_OUTPUT, 1, "not on an active synchronous line"); 93*da2e3ebdSchin return(error_info.errors); 94*da2e3ebdSchin } 95