os x bluetooth util to change and refer bluetooth power state

blueutil.m

/*
 * blueutil
 * Command-line utility to control Bluetooth.
 * Uses private API from IOBluetooth framework (i.e. IOBluetoothPreference*()).
 * http://www.frederikseiffert.de/blueutil
 * 
 * This software is public domain. It is provided without any warranty whatsoever,
 * and may be modified or used without attribution.
 *
 * Written by Frederik Seiffert <ego@frederikseiffert.de>
 * Last change: 2009-10-30
 */

#import <Foundation/Foundation.h>
// link against IOBluetooth.framework

void BTStatus();
int BTPowerState();

int BTPowerState()
{
        return IOBluetoothPreferenceGetControllerPowerState();
}

int BTSetPowerState(int powerState)
{
        IOBluetoothPreferenceSetControllerPowerState(powerState);

        usleep(2000000); // wait until BT has been set
        if (BTPowerState() != powerState) {
                printf("Error: unable to turn Bluetooth %s\n", powerState ? "on" : "off");
                return EXIT_FAILURE;
        }

        return EXIT_SUCCESS;
}

void BTStatus()
{
        printf("Status: %s\n", BTPowerState() ? "on" : "off");
}

int main(int argc, const char * argv[])
{
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
        int result = EXIT_SUCCESS;

    if (!IOBluetoothPreferencesAvailable()) {
                printf("Error: Bluetooth not available");
                result = EXIT_FAILURE;
        } else if (argc == 2 && strcmp(argv[1], "status") == 0) {
                BTStatus();
        } else if (argc == 2 && strcmp(argv[1], "on") == 0) {
                result = BTSetPowerState(1);
        } else if (argc == 2 && strcmp(argv[1], "off") == 0) {
                result = BTSetPowerState(0);
        } else {
                printf("Usage: %s [status|on|off]\n", argv[0]);
                result = EXIT_FAILURE;
        }

    [pool release];
    return result;
}