150 lines
2.8 KiB
C
150 lines
2.8 KiB
C
#include <unistd.h> /* access */
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#include <stdlib.h> /* exit */
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#include <syslog.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <errno.h>
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#include <string.h> /* strcmp */
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/* Kernel module entry for the Apple Human Interface Device driver. */
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#define APPLE_HID_PATH "/sys/module/hid_apple"
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char file_exists(const char *filename)
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{
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return access(filename, F_OK) != -1;
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}
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int init_apple_hid_module()
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{
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int fd;
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if(!file_exists(APPLE_HID_PATH)) {
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syslog(LOG_WARNING, "Apple hid module is unloaded.");
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return -1;
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}
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fd = open(APPLE_HID_PATH"/parameters/fnmode", O_RDWR);
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if(fd == -1) {
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syslog(LOG_WARNING, "Failed to open %s.",
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APPLE_HID_PATH"/parameters/fnmode");
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return -1;
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}
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return fd;
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}
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int get_fn_lock()
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{
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int fd;
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char state;
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fd = init_apple_hid_module();
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if(fd != -1) {
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if(read(fd, &state, 1) != 1)
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state = '0';
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close(fd);
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}
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return state == '2';
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}
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void set_fn_lock_on()
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{
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int fd;
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fd = init_apple_hid_module();
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if(fd != -1) {
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if(write(fd, "2", 1) != 1)
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syslog(LOG_WARNING, "Failed to write to Apple HID driver.");
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else
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syslog(LOG_INFO, "Fn lock is on.");
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close(fd);
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}
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}
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void set_fn_lock_off()
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{
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int fd = init_apple_hid_module();
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if(fd != -1) {
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if(write(fd, "1", 1) != 1)
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syslog(LOG_WARNING, "Failed to write Apple HID driver.");
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else
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syslog(LOG_INFO, "Fn lock is off.");
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close(fd);
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}
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}
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void daemonize()
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{
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close(0);
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close(1);
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close(2);
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open("/dev/null", O_RDONLY); /* stdin */
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open("/dev/null", O_WRONLY); /* stdout */
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open("/dev/null", O_WRONLY); /* stderr */
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chdir("/");
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int pid = fork();
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if(pid > 0)
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exit(0);
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setsid();
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pid = fork();
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if(pid > 0)
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exit(0);
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}
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#if 1
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static volatile sig_atomic_t n = 0;
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void usr1hdl(int sig)
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{
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int save_errno = errno;
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signal(SIGUSR1, usr1hdl);
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n = 0;
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errno = save_errno;
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}
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void termhdl(int sig)
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{
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int save_errno = errno;
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signal(SIGTERM, termhdl);
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n = 1;
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errno = save_errno;
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}
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#endif
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int main(int argc, char *argv[])
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{
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/*daemonize();*/
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signal(SIGUSR1, usr1hdl);
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signal(SIGTERM, termhdl);
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openlog("hid_apple_fn_lock", 0, LOG_USER);
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syslog(LOG_INFO, "Daemon started, pid == %d", getpid());
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uid_t euid = geteuid();
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if(euid != 0) {
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syslog(LOG_WARNING, "Must have root priviliges. Quitting...");
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return 1;
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}
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for(;;) {
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pause();
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if(n == 0) {
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if(get_fn_lock())
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set_fn_lock_off();
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else
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set_fn_lock_on();
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} else if(n == 1) {
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syslog(LOG_INFO, "Shutting down...");
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break;
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} else {
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/* ignore */
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}
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}
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closelog();
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return 0;
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}
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