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/* openvt.c - Run a program on a new VT
*
* Copyright 2014 Vivek Kumar Bhagat <vivek.bhagat89@gmail.com>
*
* No Standard
USE_OPENVT(NEWTOY(openvt, "c#<1>63sw", TOYFLAG_BIN|TOYFLAG_NEEDROOT))
USE_DEALLOCVT(NEWTOY(deallocvt, ">1", TOYFLAG_USR|TOYFLAG_BIN|TOYFLAG_NEEDROOT))
config OPENVT
bool "openvt"
default n
depends on TOYBOX_FORK
help
usage: openvt [-c NUM] [-sw] [COMMAND...]
Start a program on a new virtual terminal.
-c NUM Use VT NUM
-s Switch to new VT
-w Wait for command to exit
Together -sw switch back to originating VT when command completes.
config DEALLOCVT
bool "deallocvt"
default n
help
usage: deallocvt [NUM]
Deallocate unused virtual terminals, either a specific /dev/ttyNUM, or all.
*/
#define FOR_openvt
#include "toys.h"
#include <linux/vt.h>
#include <linux/kd.h>
GLOBALS(
long c;
)
int open_console(void)
{
char arg = 0, *console_name[] = {"/dev/tty", "/dev/tty0", "/dev/console"};
int i, fd;
for (i = 0; i < ARRAY_LEN(console_name); i++) {
if (0>(fd = open(console_name[i], O_RDWR))) continue;
if (!ioctl(fd, KDGKBTYPE, &arg)) return fd;
close(fd);
}
for (fd = 0; fd < 3; fd++) if (!ioctl(fd, KDGKBTYPE, &arg)) return fd;
error_exit("can't open console");
}
void openvt_main(void)
{
struct vt_stat vstate;
int fd;
pid_t pid;
// find current console
if (-1 == (ioctl(fd = open_console(), VT_GETSTATE, &vstate)) ||
(!TT.c && 0>=(TT.c = xioctl(fd, VT_OPENQRY, &fd))))
perror_exit("can't find open VT");
sprintf(toybuf, "/dev/tty%ld", TT.c);
close(0); //new vt becomes stdin
dup2(dup2(xopen_stdio(toybuf, O_RDWR), 1), 2);
if (FLAG(s)) {
ioctl(0, VT_ACTIVATE, (int)TT.c);
ioctl(0, VT_WAITACTIVE, (int)TT.c);
}
if (!(pid = xfork())) {
setsid();
ioctl(0, TIOCSCTTY, 0);
if (fd>2) close(fd);
xexec(toys.optargs);
}
if (FLAG(w)) {
while (-1 == waitpid(pid, NULL, 0) && errno == EINTR);
if (FLAG(s)) {
ioctl(fd, VT_ACTIVATE, vstate.v_active);
ioctl(fd, VT_WAITACTIVE, vstate.v_active);
ioctl(fd, VT_DISALLOCATE, (int)TT.c);
}
}
close(fd);
}
void deallocvt_main(void)
{
int fd, vt_num = 0; // 0 = all
if (*toys.optargs) vt_num = atolx_range(*toys.optargs, 1, 63);
if (-1 == ioctl(fd = open_console(), VT_DISALLOCATE, vt_num))
perror_exit("%d", vt_num);
close(fd);
}
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