1 /* vi: set sw=4 ts=4: */
5 * Copyright (C) many different people. If you wrote this, please
6 * acknowledge your work.
8 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
13 /* From <linux/kd.h> */
14 enum { KDGKBTYPE
= 0x4B33 }; /* get keyboard type */
16 static int open_a_console(const char *fnam
)
21 fd
= open(fnam
, O_RDWR
);
23 /* if failed, try read-only */
24 if (fd
< 0 && errno
== EACCES
)
25 fd
= open(fnam
, O_RDONLY
);
27 /* if failed, try write-only */
28 if (fd
< 0 && errno
== EACCES
)
29 fd
= open(fnam
, O_WRONLY
);
35 * Get an fd for use with kbd/console ioctls.
36 * We try several things because opening /dev/console will fail
37 * if someone else used X (which does a chown on /dev/console).
39 int FAST_FUNC
get_console_fd_or_die(void)
41 static const char *const console_names
[] = {
42 DEV_CONSOLE
, CURRENT_VC
, CURRENT_TTY
47 for (fd
= 2; fd
>= 0; fd
--) {
52 fd4name
= open_a_console(console_names
[fd
]);
54 choice_fd
= (fd4name
>= 0 ? fd4name
: fd
);
57 if (ioctl(choice_fd
, KDGKBTYPE
, &arg
) == 0)
66 bb_error_msg_and_die("can't open console");
67 /*return fd; - total failure */
70 /* From <linux/vt.h> */
72 VT_ACTIVATE
= 0x5606, /* make vt active */
73 VT_WAITACTIVE
= 0x5607 /* wait for vt active */
76 void FAST_FUNC
console_make_active(int fd
, const int vt_num
)
78 xioctl(fd
, VT_ACTIVATE
, (void *)(ptrdiff_t)vt_num
);
79 xioctl(fd
, VT_WAITACTIVE
, (void *)(ptrdiff_t)vt_num
);