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vconsole: Add generic is_*() functions
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.
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@ -51,6 +51,37 @@ static bool is_vconsole(int fd) {
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return ioctl(fd, TIOCLINUX, data) >= 0;
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}
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static bool is_allocated(unsigned int idx) {
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char vcname[strlen("/dev/vcs") + DECIMAL_STR_MAX(int)];
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xsprintf(vcname, "/dev/vcs%i", idx);
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return access(vcname, F_OK) == 0;
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}
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static bool is_allocated_byfd(int fd) {
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struct vt_stat vcs = {};
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if (ioctl(fd, VT_GETSTATE, &vcs) < 0) {
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log_warning_errno(errno, "VT_GETSTATE failed: %m");
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return false;
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}
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return is_allocated(vcs.v_active);
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}
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static bool is_settable(int fd) {
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int r, curr_mode;
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r = ioctl(fd, KDGKBMODE, &curr_mode);
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/*
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* Make sure we only adjust consoles in K_XLATE or K_UNICODE mode.
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* Oterwise we would (likely) interfere with X11's processing of the
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* key events.
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*
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* http://lists.freedesktop.org/archives/systemd-devel/2013-February/008573.html
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*/
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return r == 0 && IN_SET(curr_mode, K_XLATE, K_UNICODE);
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}
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static int toggle_utf8(int fd, bool utf8) {
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int r;
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struct termios tc = {};
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@ -262,6 +293,16 @@ int main(int argc, char **argv) {
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return EXIT_FAILURE;
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}
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if (!is_allocated_byfd(fd)) {
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log_error("Virtual console %s is not allocated.", vc);
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return EXIT_FAILURE;
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}
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if (!is_settable(fd)) {
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log_error("Virtual console %s is not in K_XLATE or K_UNICODE.", vc);
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return EXIT_FAILURE;
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}
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utf8 = is_locale_utf8();
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r = parse_env_file("/etc/vconsole.conf", NEWLINE,
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