#include "config.h"
#include <stdio.h>
#include "builtins.h"
#include "shell.h"
#include "bashgetopt.h"
extern char *ttyname ();
tty_builtin (list)
WORD_LIST *list;
{
int opt, sflag;
char *t;
reset_internal_getopt ();
sflag = 0;
while ((opt = internal_getopt (list, "s")) != -1)
{
switch (opt)
{
case 's':
sflag = 1;
break;
default:
builtin_usage ();
return (EX_USAGE);
}
}
list = loptend;
t = ttyname (0);
if (sflag == 0)
puts (t ? t : "not a tty");
return (t ? EXECUTION_SUCCESS : EXECUTION_FAILURE);
}
char *tty_doc[] = {
"tty writes the name of the terminal that is opened for standard",
"input to standard output. If the `-s' option is supplied, nothing",
"is written; the exit status determines whether or not the standard",
"input is connected to a tty.",
(char *)NULL
};
struct builtin tty_struct = {
"tty",
tty_builtin,
BUILTIN_ENABLED,
tty_doc,
"tty [-s]",
0
};