Package: console-tools
Version: 1:0.2.3dbs-65
Severity: wishlist
The `chvt' utility takes a numeric argument and activates the
specified virtual terminal.
Suppose I want to temporarily activate a specific vt for a special
purpose, and then switch back to the previously active one when I've
finished. In order to do this, I first need to find out what the
_currently_ active vt is, then chvt to the new one, and finally chvt
back to the original one. So I need a program which will tell me
what the currently active vt is.
A quick search with `apropos' was unable to find such a program, and
console-tools in particular doesn't seem to contain one, which seems
odd because it struck me as an obvious thing to want (it is to
`read' as chvt is to `write') and because it's trivially implemented
by an existing ioctl.
Accordingly, I've written it, by hacking on a copy of chvt.c. I
attach the resulting source file, `whichvt.c', which ought to be
easy to slot into the existing console-tools source framework (in
the vttools subdirectory, alongside chvt.c). I'm afraid I didn't get
sufficiently to grips with the Debian packaging mechanism to be able
to prepare a full update to the source package.
I hope you'll consider incorporating this utility into a future
version of the console-tools package. (Of course, feel free to pass
it upstream if you think that's more sensible.)
Cheers,
Simon
--
Simon Tatham "My heart bleeds.
<[EMAIL PROTECTED]> (That's how it works.)" -- Gareth Taylor
/*
* whichvt.c - sgt - 2007-12-08 - detect current virtual terminal
*/
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <linux/vt.h>
#include <getopt.h>
#include <lct/local.h>
#include <lct/utils.h>
#include <lct/console.h>
static void usage(char *progname)
{
printf(_("Usage: %s\n"
"Find number of current virtual terminal\n"), progname);
OPTIONS_ARE();
OPT("-h --help ", HELPDESC);
OPT("-V --version ", VERSIONDESC);
}
void parse_args (int argc,char **argv)
{
char * progname = strip_path(argv[0]);
const struct option long_opts[] = {
{"help" , no_argument, NULL, 'h' },
{"version", no_argument, NULL, 'V' },
{ NULL, 0, NULL, 0}
};
int c, cons = -1;
while ( (c = getopt_long (argc, argv, "Vht:", long_opts, NULL)) != EOF) {
switch (c) {
case 'h':
usage(progname);
exit(0);
case 'V':
version(progname);
exit(0);
case '?':
default:
usage(progname);
exit(1);
}
}
if (argc != optind) {
fprintf(stderr,_("%s: Wrong number of args\n"), progname);
exit(1);
}
}
int main(int argc, char *argv[])
{
int fd, num;
struct vt_stat stat;
setuplocale();
parse_args (argc, argv);
if (-1 == (fd = get_console_fd(NULL))) exit (1);
if (ioctl(fd, VT_GETSTATE, &stat)) {
perror("chvt: VT_GETSTATE");
exit(1);
}
printf("%d\n", stat.v_active);
exit(0);
}
