1*4887Schin /*********************************************************************** 2*4887Schin * * 3*4887Schin * This software is part of the ast package * 4*4887Schin * Copyright (c) 1992-2007 AT&T Knowledge Ventures * 5*4887Schin * and is licensed under the * 6*4887Schin * Common Public License, Version 1.0 * 7*4887Schin * by AT&T Knowledge Ventures * 8*4887Schin * * 9*4887Schin * A copy of the License is available at * 10*4887Schin * http://www.opensource.org/licenses/cpl1.0.txt * 11*4887Schin * (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) * 12*4887Schin * * 13*4887Schin * Information and Software Systems Research * 14*4887Schin * AT&T Research * 15*4887Schin * Florham Park NJ * 16*4887Schin * * 17*4887Schin * Glenn Fowler <gsf@research.att.com> * 18*4887Schin * David Korn <dgk@research.att.com> * 19*4887Schin * * 20*4887Schin ***********************************************************************/ 21*4887Schin #pragma prototyped 22*4887Schin /* 23*4887Schin * David Korn 24*4887Schin * AT&T Bell Laboratories 25*4887Schin * 26*4887Schin * tty 27*4887Schin */ 28*4887Schin 29*4887Schin static const char usage[] = 30*4887Schin "[-?\n@(#)$Id: tty (AT&T Research) 2007-03-11 $\n]" 31*4887Schin USAGE_LICENSE 32*4887Schin "[+NAME?tty - write the name of the terminal to standard output]" 33*4887Schin "[+DESCRIPTION?\btty\b writes the name of the terminal that is connected " 34*4887Schin "to standard input onto standard output. If the standard input is not " 35*4887Schin "a terminal, \"\bnot a tty\b\" will be written to standard output.]" 36*4887Schin "[l:line-number?Write the synchronous line number of the terminal on a " 37*4887Schin "separate line following the terminal name line. If the standard " 38*4887Schin "input is not a synchronous terminal then " 39*4887Schin "\"\bnot on an active synchronous line\b\" is written.]" 40*4887Schin "[s:silent|quiet?Disable the terminal name line. Use \b[[ -t 0 ]]]]\b instead.]" 41*4887Schin "[+EXIT STATUS?]{" 42*4887Schin "[+0?Standard input is a tty.]" 43*4887Schin "[+1?Standard input is not a tty.]" 44*4887Schin "[+2?Invalid arguments.]" 45*4887Schin "[+3?A an error occurred.]" 46*4887Schin "}" 47*4887Schin ; 48*4887Schin 49*4887Schin 50*4887Schin #include <cmd.h> 51*4887Schin 52*4887Schin #if _mac_STWLINE 53*4887Schin #include <sys/stermio.h> 54*4887Schin #endif 55*4887Schin 56*4887Schin int 57*4887Schin b_tty(int argc, char *argv[], void* context) 58*4887Schin { 59*4887Schin register int n,sflag=0,lflag=0; 60*4887Schin register char *tty; 61*4887Schin 62*4887Schin cmdinit(argc, argv, context, ERROR_CATALOG, 0); 63*4887Schin while (n = optget(argv, usage)) switch (n) 64*4887Schin { 65*4887Schin case 'l': 66*4887Schin lflag++; 67*4887Schin break; 68*4887Schin case 's': 69*4887Schin sflag++; 70*4887Schin break; 71*4887Schin case ':': 72*4887Schin error(2, "%s", opt_info.arg); 73*4887Schin break; 74*4887Schin case '?': 75*4887Schin error(ERROR_usage(2), "%s", opt_info.arg); 76*4887Schin break; 77*4887Schin } 78*4887Schin if(error_info.errors) 79*4887Schin error(ERROR_usage(2), "%s", optusage(NiL)); 80*4887Schin if(!(tty=ttyname(0))) 81*4887Schin { 82*4887Schin tty = ERROR_translate(0, 0, 0, "not a tty"); 83*4887Schin error_info.errors++; 84*4887Schin } 85*4887Schin if(!sflag) 86*4887Schin sfputr(sfstdout,tty,'\n'); 87*4887Schin #if _mac_STWLINE 88*4887Schin if(lflag && (n = ioctl(0, STWLINE, 0)) >= 0) 89*4887Schin error(ERROR_OUTPUT, 1, "synchronous line %d", n); 90*4887Schin else 91*4887Schin #endif 92*4887Schin error(ERROR_OUTPUT, 1, "not on an active synchronous line"); 93*4887Schin return(error_info.errors); 94*4887Schin } 95