59 lines
1.3 KiB
C
59 lines
1.3 KiB
C
/* tty - return terminal name */
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/* See Makefile for compilation details. */
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#include "config.h"
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#include <stdio.h>
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#include "builtins.h"
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#include "shell.h"
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#include "bashgetopt.h"
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extern char *ttyname ();
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tty_builtin (list)
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WORD_LIST *list;
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{
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int opt, sflag;
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char *t;
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reset_internal_getopt ();
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sflag = 0;
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while ((opt = internal_getopt (list, "s")) != -1)
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{
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switch (opt)
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{
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case 's':
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sflag = 1;
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break;
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default:
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builtin_usage ();
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return (EX_USAGE);
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}
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}
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list = loptend;
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t = ttyname (0);
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if (sflag == 0)
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puts (t ? t : "not a tty");
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return (t ? EXECUTION_SUCCESS : EXECUTION_FAILURE);
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}
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char *tty_doc[] = {
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"tty writes the name of the terminal that is opened for standard",
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"input to standard output. If the `-s' option is supplied, nothing",
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"is written; the exit status determines whether or not the standard",
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"input is connected to a tty.",
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(char *)NULL
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};
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/* The standard structure describing a builtin command. bash keeps an array
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of these structures. */
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struct builtin tty_struct = {
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"tty", /* builtin name */
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tty_builtin, /* function implementing the builtin */
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BUILTIN_ENABLED, /* initial flags for builtin */
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tty_doc, /* array of long documentation strings. */
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"tty [-s]", /* usage synopsis; becomes short_doc */
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0 /* reserved for internal use */
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};
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