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Diffstat (limited to 'usr/src/lib/libcmd/common/tty.c')
| -rw-r--r-- | usr/src/lib/libcmd/common/tty.c | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/usr/src/lib/libcmd/common/tty.c b/usr/src/lib/libcmd/common/tty.c new file mode 100644 index 0000000000..22115b2343 --- /dev/null +++ b/usr/src/lib/libcmd/common/tty.c @@ -0,0 +1,94 @@ +/*********************************************************************** +* * +* This software is part of the ast package * +* Copyright (c) 1992-2007 AT&T Knowledge Ventures * +* and is licensed under the * +* Common Public License, Version 1.0 * +* by AT&T Knowledge Ventures * +* * +* A copy of the License is available at * +* http://www.opensource.org/licenses/cpl1.0.txt * +* (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) * +* * +* Information and Software Systems Research * +* AT&T Research * +* Florham Park NJ * +* * +* Glenn Fowler <gsf@research.att.com> * +* David Korn <dgk@research.att.com> * +* * +***********************************************************************/ +#pragma prototyped +/* + * David Korn + * AT&T Bell Laboratories + * + * tty + */ + +static const char usage[] = +"[-?\n@(#)$Id: tty (AT&T Research) 2007-03-11 $\n]" +USAGE_LICENSE +"[+NAME?tty - write the name of the terminal to standard output]" +"[+DESCRIPTION?\btty\b writes the name of the terminal that is connected " + "to standard input onto standard output. If the standard input is not " + "a terminal, \"\bnot a tty\b\" will be written to standard output.]" +"[l:line-number?Write the synchronous line number of the terminal on a " + "separate line following the terminal name line. If the standard " + "input is not a synchronous terminal then " + "\"\bnot on an active synchronous line\b\" is written.]" +"[s:silent|quiet?Disable the terminal name line. Use \b[[ -t 0 ]]]]\b instead.]" +"[+EXIT STATUS?]{" + "[+0?Standard input is a tty.]" + "[+1?Standard input is not a tty.]" + "[+2?Invalid arguments.]" + "[+3?A an error occurred.]" +"}" +; + + +#include <cmd.h> + +#if _mac_STWLINE +#include <sys/stermio.h> +#endif + +int +b_tty(int argc, char *argv[], void* context) +{ + register int n,sflag=0,lflag=0; + register char *tty; + + cmdinit(argc, argv, context, ERROR_CATALOG, 0); + while (n = optget(argv, usage)) switch (n) + { + case 'l': + lflag++; + break; + case 's': + sflag++; + break; + case ':': + error(2, "%s", opt_info.arg); + break; + case '?': + error(ERROR_usage(2), "%s", opt_info.arg); + break; + } + if(error_info.errors) + error(ERROR_usage(2), "%s", optusage(NiL)); + if(!(tty=ttyname(0))) + { + tty = ERROR_translate(0, 0, 0, "not a tty"); + error_info.errors++; + } + if(!sflag) + sfputr(sfstdout,tty,'\n'); +#if _mac_STWLINE + if(lflag && (n = ioctl(0, STWLINE, 0)) >= 0) + error(ERROR_OUTPUT, 1, "synchronous line %d", n); + else +#endif + error(ERROR_OUTPUT, 1, "not on an active synchronous line"); + return(error_info.errors); +} |