On Thursday 27 September 2007 08:43, Vladimir Dronnikov wrote:
> In addition I want to share new "led" applet
> It prints (when no parameters given) or sets (when a number given) the
> keyboard leds state.
> When it recognizes the only parameter as valid file name it playbacks the
> sequence of states.
> Example of SOS sequence is given at the top of the file
+static int kfd = -1;
...
+ kfd = open("/dev/console", O_RDWR);
+ if (kfd < 0)
+ bb_perror_msg_and_die("can't open console device");
Code which is smaller and needs no statics:
enum { kfd = 3 };
...
xmove_fd(xopen("/dev/console", O_WRONLY), kfd);
+ // if no args specified -> dump current state
+ if (argc < 2) {
+ ioctl(kfd, KDGETLED, &state);
+ state = (state & 7) + '0';
+ write(1, &state, 1);
+ write(1, "\n", 1);
+ }
+ // if arg is not a file -> treat it as a new state
+ else if (stat(argv[1], &st)) {
+ ioctl(kfd, KDSETLED, atoi(argv[1]) & 7);
+ }
+ // if arg is a file -> read it char-by-char
+ else {
+ // open file
+ fd = open(argv[1], O_RDONLY);
+ if (fd < 0) {
+ bb_perror_msg("can't open input file");
+ goto clean_exit;
+ }
xopen().
+ // set cleanup
+ signal(SIGINT, sig_quit);
+ signal(SIGQUIT, sig_quit);
+ signal(SIGTERM, sig_quit);
+ // read and display data
+ while (1 == read(fd, &c, 1) || EINTR == errno) {
With safe_read() instead of read(), you don't need to check EINTR.
+ // . means 50 ms delay
+ if ('*' == c) { usleep(50000); continue; }
+ // - means 200 ms delay
+ if ( '.' == c ) { usleep(200000); continue; }
+ // * means 500 ms delay
+ if ( '-' == c ) { usleep(500000); continue; }
+ // ^ means rewind
+ if ( '^' == c ) { lseek(fd, 0, 0); continue; }
+ // 0-9 means new state
+ if ( c < '0' || c > '9' ) continue;
+ // set state
+ ioctl(kfd, KDSETLED, (c-'0') & 7);
+ }
+ close(fd);
only if (ENABLE_FEATURE_CLEAN_UP)...
--
vda
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