usr/src/lib/libcmd/common/tty.c

   1 /***********************************************************************
   2 *                                                                      *
   3 *               This software is part of the ast package               *
   4 *          Copyright (c) 1992-2010 AT&T Intellectual Property          *
   5 *                      and is licensed under the                       *
   6 *                  Common Public License, Version 1.0                  *
   7 *                    by AT&T Intellectual Property                     *
   8 *                                                                      *
   9 *                A copy of the License is available at                 *
  10 *            http://www.opensource.org/licenses/cpl1.0.txt             *
  11 *         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
  12 *                                                                      *
  13 *              Information and Software Systems Research               *
  14 *                            AT&T Research                             *
  15 *                           Florham Park NJ                            *
  16 *                                                                      *
  17 *                 Glenn Fowler <gsf@research.att.com>                  *
  18 *                  David Korn <dgk@research.att.com>                   *
  19 *                                                                      *
  20 ***********************************************************************/
  21 #pragma prototyped
  22 /*
  23  * David Korn
  24  * AT&T Bell Laboratories
  25  *
  26  * tty
  27  */
  28
  29 static const char usage[] =
  30 "[-?\n@(#)$Id: tty (AT&T Research) 2008-03-13 $\n]"
  31 USAGE_LICENSE
  32 "[+NAME?tty - write the name of the terminal to standard output]"
  33 "[+DESCRIPTION?\btty\b writes the name of the terminal that is connected "
  34         "to standard input onto standard output.  If the standard input is not "
  35         "a terminal, \"\bnot a tty\b\" will be written to standard output.]"
  36 "[l:line-number?Write the synchronous line number of the terminal on a "
  37         "separate line following the terminal name line. If the standard "
  38         "input is not a synchronous  terminal then "
  39         "\"\bnot on an active synchronous line\b\" is written.]"
  40 "[s:silent|quiet?Disable the terminal name line. Use \b[[ -t 0 ]]]]\b instead.]"
  41 "[+EXIT STATUS?]{"
  42         "[+0?Standard input is a tty.]"
  43         "[+1?Standard input is not a tty.]"
  44         "[+2?Invalid arguments.]"
  45         "[+3?A an error occurred.]"
  46 "}"
  47 ;
  48
  49
  50 #include <cmd.h>
  51
  52 #if _mac_STWLINE
  53 #include <sys/stermio.h>
  54 #endif
  55
  56 int
  57 b_tty(int argc, char *argv[], void* context)
  58 {
  59         register int n,sflag=0,lflag=0;
  60         register char *tty;
  61
  62         cmdinit(argc, argv, context, ERROR_CATALOG, 0);
  63         while (n = optget(argv, usage)) switch (n)
  64         {
  65         case 'l':
  66                 lflag++;
  67                 break;
  68         case 's':
  69                 sflag++;
  70                 break;
  71         case ':':
  72                 error(2, "%s", opt_info.arg);
  73                 break;
  74         case '?':
  75                 error(ERROR_usage(2), "%s", opt_info.arg);
  76                 break;
  77         }
  78         if(error_info.errors)
  79                 error(ERROR_usage(2), "%s", optusage(NiL));
  80         if(!(tty=ttyname(0)))
  81         {
  82                 tty = ERROR_translate(0, 0, 0, "not a tty");
  83                 error_info.errors++;
  84         }
  85         if(!sflag)
  86                 sfputr(sfstdout,tty,'\n');
  87         if(lflag)
  88         {
  89 #if _mac_STWLINE
  90                 if (n = ioctl(0, STWLINE, 0)) >= 0)
  91                         error(ERROR_OUTPUT, 1, "synchronous line %d", n);
  92                 else
  93 #endif
  94                         error(ERROR_OUTPUT, 1, "not on an active synchronous line");
  95         }
  96         return(error_info.errors);
  97 }