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vconsole: Add generic is_*() functions

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is_allocated() and is_allocated_byfd():

Checks if the console is allocated by its index (first function) or
its open descriptor (second function).

is_settable():

Checks if the console is in xlate or unicode mode, so we can adjust
is safely without interfering with X.
This commit is contained in:
Michal Soltys 2016-07-27 00:57:01 +02:00
parent 042d7f5065
commit 03044059bf
1 changed files with 41 additions and 0 deletions
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41
src/vconsole/vconsole-setup.c
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@ -51,6 +51,37 @@ static bool is_vconsole(int fd) {
return ioctl(fd, TIOCLINUX, data) >= 0;
}
static bool is_allocated(unsigned int idx) {
char vcname[strlen("/dev/vcs") + DECIMAL_STR_MAX(int)];
xsprintf(vcname, "/dev/vcs%i", idx);
return access(vcname, F_OK) == 0;
}
static bool is_allocated_byfd(int fd) {
struct vt_stat vcs = {};
if (ioctl(fd, VT_GETSTATE, &vcs) < 0) {
log_warning_errno(errno, "VT_GETSTATE failed: %m");
return false;
}
return is_allocated(vcs.v_active);
}
static bool is_settable(int fd) {
int r, curr_mode;
r = ioctl(fd, KDGKBMODE, &curr_mode);
/*
* Make sure we only adjust consoles in K_XLATE or K_UNICODE mode.
* Oterwise we would (likely) interfere with X11's processing of the
* key events.
*
* http://lists.freedesktop.org/archives/systemd-devel/2013-February/008573.html
*/
return r == 0 && IN_SET(curr_mode, K_XLATE, K_UNICODE);
}
static int toggle_utf8(int fd, bool utf8) {
int r;
struct termios tc = {};
@ -262,6 +293,16 @@ int main(int argc, char **argv) {
return EXIT_FAILURE;
}
if (!is_allocated_byfd(fd)) {
log_error("Virtual console %s is not allocated.", vc);
return EXIT_FAILURE;
}
if (!is_settable(fd)) {
log_error("Virtual console %s is not in K_XLATE or K_UNICODE.", vc);
return EXIT_FAILURE;
}
utf8 = is_locale_utf8();
r = parse_env_file("/etc/vconsole.conf", NEWLINE,