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int f = open("/dev/plcm_drv", O_RDWR);
printf("%x\n", ioctl(f, 0xC, 0) );

sysopen(DEVICE, "/dev/plcm_drv", O_RDWR);
print sprintf("%x", ioctl(DEVICE, 0xC, 0)) . "\n";

Working (C, ioctl 0xC):

...
fcntl64(3, F_SETFD, FD_CLOEXEC)         = 0
ioctl(3, 0xc, 0)                        = -1 EINVAL (Invalid argument)
close(3)                                = 0