int showkey_main(int argc UNUSED_PARAM, char **argv)
{
enum {
OPT_a = (1<<0), // display the decimal/octal/hex values of the keys
OPT_k = (1<<1), // display only the interpreted keycodes (default)
OPT_s = (1<<2), // display only the raw scan-codes
};
INIT_G();
// FIXME: aks are all mutually exclusive
getopt32(argv, "aks");
// prepare for raw mode
xget1(&tio, &tio0);
// put stdin in raw mode
xset1(&tio);
#define press_keys "Press any keys, program terminates %s:\r\n\n"
if (option_mask32 & OPT_a) {
// just read stdin char by char
unsigned char c;
printf(press_keys, "on EOF (ctrl-D)");
// read and show byte values
while (1 == read(STDIN_FILENO, &c, 1)) {
printf("%3u 0%03o 0x%02x\r\n", c, c, c);
if (04 /*CTRL-D*/ == c)
break;
}
} else {
// we assume a PC keyboard
xioctl(STDIN_FILENO, KDGKBMODE, &kbmode);
printf("Keyboard mode was %s.\r\n\n",
kbmode == K_RAW ? "RAW" :
(kbmode == K_XLATE ? "XLATE" :
(kbmode == K_MEDIUMRAW ? "MEDIUMRAW" :
(kbmode == K_UNICODE ? "UNICODE" : "UNKNOWN")))
);
// set raw keyboard mode
xioctl(STDIN_FILENO, KDSKBMODE, (void *)(ptrdiff_t)((option_mask32 & OPT_k) ? K_MEDIUMRAW : K_RAW));
// we should exit on any signal; signals should interrupt read
bb_signals_recursive_norestart(BB_FATAL_SIGS, record_signo);
// inform user that program ends after time of inactivity
printf(press_keys, "10s after last keypress");
// read and show scancodes
while (!bb_got_signal) {
char buf[18];
int i, n;
// setup 10s watchdog
alarm(10);
// read scancodes
n = read(STDIN_FILENO, buf, sizeof(buf));
i = 0;
while (i < n) {
if (option_mask32 & OPT_s) {
// show raw scancodes
printf("0x%02x ", buf[i++]);
} else {
// show interpreted scancodes (default)
char c = buf[i];
int kc;
if (i+2 < n
&& (c & 0x7f) == 0
&& (buf[i+1] & 0x80) != 0
&& (buf[i+2] & 0x80) != 0
) {
kc = ((buf[i+1] & 0x7f) << 7) | (buf[i+2] & 0x7f);
i += 3;
} else {
kc = (c & 0x7f);
i++;
}
printf("keycode %3u %s", kc, (c & 0x80) ? "release" : "press");
}
}
puts("\r");
}
// restore keyboard mode
xioctl(STDIN_FILENO, KDSKBMODE, (void *)(ptrdiff_t)kbmode);
}
// restore console settings
xset1(&tio0);
return EXIT_SUCCESS;
}
int microcom_main(int argc UNUSED_PARAM, char **argv)
{
int sfd;
int nfd;
struct pollfd pfd[2];
struct termios tio0, tiosfd, tio;
char *device_lock_file;
enum {
OPT_X = 1 << 0, // do not respect Ctrl-X, Ctrl-@
OPT_s = 1 << 1, // baudrate
OPT_d = 1 << 2, // wait for device response, ms
OPT_t = 1 << 3, // timeout, ms
};
speed_t speed = 9600;
int delay = -1;
int timeout = -1;
unsigned opts;
// fetch options
opt_complementary = "=1:s+:d+:t+"; // exactly one arg, numeric options
opts = getopt32(argv, "Xs:d:t:", &speed, &delay, &timeout);
// argc -= optind;
argv += optind;
// try to create lock file in /var/lock
device_lock_file = (char *)bb_basename(argv[0]);
device_lock_file = xasprintf("/var/lock/LCK..%s", device_lock_file);
sfd = open(device_lock_file, O_CREAT | O_WRONLY | O_TRUNC | O_EXCL, 0644);
if (sfd < 0) {
// device already locked -> bail out
if (errno == EEXIST)
bb_perror_msg_and_die("can't create %s", device_lock_file);
// can't create lock -> don't care
if (ENABLE_FEATURE_CLEAN_UP)
free(device_lock_file);
device_lock_file = NULL;
} else {
// %4d to make concurrent mgetty (if any) happy.
// Mgetty treats 4-bytes lock files as binary,
// not text, PID. Making 5+ char file. Brrr...
fdprintf(sfd, "%4d\n", getpid());
close(sfd);
}
// setup signals
bb_signals(0
+ (1 << SIGHUP)
+ (1 << SIGINT)
+ (1 << SIGTERM)
+ (1 << SIGPIPE)
, signal_handler);
// error exit code if we fail to open the device
signalled = 1;
// open device
sfd = open_or_warn(argv[0], O_RDWR | O_NOCTTY | O_NONBLOCK);
if (sfd < 0)
goto done;
fcntl(sfd, F_SETFL, 0);
// put device to "raw mode"
xget1(sfd, &tio, &tiosfd);
// set device speed
cfsetspeed(&tio, tty_value_to_baud(speed));
if (xset1(sfd, &tio, argv[0]))
goto done;
// put stdin to "raw mode" (if stdin is a TTY),
// handle one character at a time
if (isatty(STDIN_FILENO)) {
xget1(STDIN_FILENO, &tio, &tio0);
if (xset1(STDIN_FILENO, &tio, "stdin"))
goto done;
}
// main loop: check with poll(), then read/write bytes across
pfd[0].fd = sfd;
pfd[0].events = POLLIN;
pfd[1].fd = STDIN_FILENO;
pfd[1].events = POLLIN;
signalled = 0;
nfd = 2;
while (!signalled && safe_poll(pfd, nfd, timeout) > 0) {
if (nfd > 1 && pfd[1].revents) {
char c;
// read from stdin -> write to device
if (safe_read(STDIN_FILENO, &c, 1) < 1) {
// don't poll stdin anymore if we got EOF/error
nfd--;
goto skip_write;
}
// do we need special processing?
if (!(opts & OPT_X)) {
// ^@ sends Break
if (VINTR == c) {
tcsendbreak(sfd, 0);
goto skip_write;
}
// ^X exits
if (24 == c)
break;
}
write(sfd, &c, 1);
if (delay >= 0)
safe_poll(pfd, 1, delay);
skip_write: ;
}
if (pfd[0].revents) {
#define iobuf bb_common_bufsiz1
ssize_t len;
// read from device -> write to stdout
len = safe_read(sfd, iobuf, sizeof(iobuf));
if (len > 0)
full_write(STDOUT_FILENO, iobuf, len);
else {
// EOF/error -> bail out
signalled = SIGHUP;
break;
}
}
}
// restore device mode
tcsetattr(sfd, TCSAFLUSH, &tiosfd);
if (isatty(STDIN_FILENO))
tcsetattr(STDIN_FILENO, TCSAFLUSH, &tio0);
done:
if (device_lock_file)
unlink(device_lock_file);
return signalled;
}