widget/src/cocoa/nsIdleServiceX.mm
author David Anderson <danderson@mozilla.com>
Wed, 05 Oct 2011 18:37:11 -0700
changeset 112094 cad26d2fb5af799dfe030fd2a8948d617eac2f52
parent 40944 57f0bc3d9edb5fe79bea5ee65b3c2457684dc560
permissions -rw-r--r--
Backout merge.

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 * for the specific language governing rights and limitations under the
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 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is
 * Shawn Wilsher <me@shawnwilsher.com>
 * Portions created by the Initial Developer are Copyright (C) 2007
 * the Initial Developer. All Rights Reserved.
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 *
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#include "nsIdleServiceX.h"
#include "nsObjCExceptions.h"
#include "nsIServiceManager.h"
#import <Foundation/Foundation.h>

NS_IMPL_ISUPPORTS2(nsIdleServiceX, nsIIdleService, nsIdleService)

bool
nsIdleServiceX::PollIdleTime(PRUint32 *aIdleTime)
{
  NS_OBJC_BEGIN_TRY_ABORT_BLOCK_RETURN;

  kern_return_t rval;
  mach_port_t masterPort;

  rval = IOMasterPort(kIOMasterPortDefault, &masterPort);
  if (rval != KERN_SUCCESS)
    return false;

  io_iterator_t hidItr;
  rval = IOServiceGetMatchingServices(masterPort,
                                      IOServiceMatching("IOHIDSystem"),
                                      &hidItr);

  if (rval != KERN_SUCCESS)
    return false;
  NS_ASSERTION(hidItr, "Our iterator is null, but it ought not to be!");

  io_registry_entry_t entry = IOIteratorNext(hidItr);
  NS_ASSERTION(entry, "Our IO Registry Entry is null, but it shouldn't be!");

  IOObjectRelease(hidItr);

  NSMutableDictionary *hidProps;
  rval = IORegistryEntryCreateCFProperties(entry,
                                           (CFMutableDictionaryRef*)&hidProps,
                                           kCFAllocatorDefault, 0);
  if (rval != KERN_SUCCESS)
    return false;
  NS_ASSERTION(hidProps, "HIDProperties is null, but no error was returned.");
  [hidProps autorelease];

  id idleObj = [hidProps objectForKey:@"HIDIdleTime"];
  NS_ASSERTION([idleObj isKindOfClass: [NSData class]] ||
               [idleObj isKindOfClass: [NSNumber class]],
               "What we got for the idle object is not what we expect!");

  uint64_t time;
  if ([idleObj isKindOfClass: [NSData class]])
    [idleObj getBytes: &time];
  else
    time = [idleObj unsignedLongLongValue];

  IOObjectRelease(entry);

  // convert to ms from ns
  time /= 1000000;
  if (time > PR_UINT32_MAX) // Overflow will occur
    return false;

  *aIdleTime = static_cast<PRUint32>(time);

  return true;

  NS_OBJC_END_TRY_ABORT_BLOCK_RETURN(false);
}

bool
nsIdleServiceX::UsePollMode()
{
  return true;
}