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超全的iOS各种设备信息获取方法总结(包括iPhone8/iPhone X)

发布时间：2020-10-17 08:58:20 作者：si1ence
来源：脚本之家 阅读：282

前言

在开发中，有的时候为了统计用户信息、下发广告，服务器端往往需要手机用户设备及app的各种信息，这些信息的获取可以根据不同的设备或者App、系统版本来提供不同的功能或更好的用户体验，或者让开发者能更好的分析用户的问题原因。

下面讲述一下各种信息的获取方式：

超全的iOS各种设备信息获取方法总结(包括iPhone8/iPhone X)

超全的iOS各种设备信息获取方法总结(包括iPhone8/iPhone X)

超全的iOS各种设备信息获取方法总结(包括iPhone8/iPhone X)

超全的iOS各种设备信息获取方法总结(包括iPhone8/iPhone X)

点击下载以上展示效果的GitHub源码 ，大家也可以 本地下载

一行代码就搞定的统一来！

 // 这个方法后面会列出来
 NSString *deviceName = [self getDeviceName];
 NSLog(@"设备型号-->%@", deviceName); 
 NSString *iPhoneName = [UIDevice currentDevice].name;
 NSLog(@"iPhone名称-->%@", iPhoneName); 
 NSString *appVerion = [[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleShortVersionString"];
 NSLog(@"app版本号-->%@", appVerion); 
 CGFloat batteryLevel = [[UIDevice currentDevice] batteryLevel];
 NSLog(@"电池电量-->%f", batteryLevel); 
 NSString *localizedModel = [UIDevice currentDevice].localizedModel;
 NSLog(@"localizedModel-->%@", localizedModel); 
 NSString *systemName = [UIDevice currentDevice].systemName;
 NSLog(@"当前系统名称-->%@", systemName); 
 NSString *systemVersion = [UIDevice currentDevice].systemVersion;
 NSLog(@"当前系统版本号-->%@", systemVersion);
 struct utsname systemInfo;
 uname(&systemInfo);
 NSString *device_model = [NSString stringWithCString:systemInfo.machine encoding:NSUTF8StringEncoding];
 NSLog(@"device_model-->%@", device_model);
 // 这个方法后面会单独列出
 NSString *macAddress = [self getMacAddress];
 NSLog(@"macAddress-->%@", macAddress); 
 // 这个方法后面会单独列出
 NSString *deviceIP = [self getDeviceIPAddresses];
 NSLog(@"deviceIP-->%@", deviceIP);
 // 设备上次重启的时间
 NSTimeInterval time = [[NSProcessInfo processInfo] systemUptime];
 NSDate *lastRestartDate = [[NSDate alloc] initWithTimeIntervalSinceNow:(0 - time)];

广告位标识符：在同一个设备上的所有App都会取到相同的值，是苹果专门给各广告提供商用来追踪用户而设的，用户可以在 设置|隐私|广告追踪里重置此id的值，或限制此id的使用，故此id有可能会取不到值，但好在Apple默认是允许追踪的，而且一般用户都不知道有这么个设置，所以基本上用来监测推广效果，是戳戳有余了

 NSString *idfa = [[[ASIdentifierManager sharedManager] advertisingIdentifier] UUIDString];
 NSLog(@"广告位标识符idfa-->%@", idfa);

UUID是Universally Unique Identifier的缩写，中文意思是通用唯一识别码。它是让分布式系统中的所有元素，都能有唯一的辨识资讯，而不需要透过中央控制端来做辨识资讯的指 定。这样，每个人都可以建立不与其它人冲突的 UUID。在此情况下，就不需考虑数据库建立时的名称重复问题。苹果公司建议使用UUID为应用生成唯一标识字符串。

 NSString *uuid = [[[UIDevice currentDevice] identifierForVendor] UUIDString];
 NSLog(@"唯一识别码uuid-->%@", uuid);

获取设备型号

// 获取设备型号然后手动转化为对应名称
- (NSString *)getDeviceName
{
 // 需要#import "sys/utsname.h"
 #warning 题主呕心沥血总结！！最全面！亲测！全网独此一份！！
 struct utsname systemInfo;
 uname(&systemInfo);
 NSString *deviceString = [NSString stringWithCString:systemInfo.machine encoding:NSUTF8StringEncoding]; 
 if ([deviceString isEqualToString:@"iPhone3,1"]) return @"iPhone 4";
 if ([deviceString isEqualToString:@"iPhone3,2"]) return @"iPhone 4";
 if ([deviceString isEqualToString:@"iPhone3,3"]) return @"iPhone 4";
 if ([deviceString isEqualToString:@"iPhone4,1"]) return @"iPhone 4S";
 if ([deviceString isEqualToString:@"iPhone5,1"]) return @"iPhone 5";
 if ([deviceString isEqualToString:@"iPhone5,2"]) return @"iPhone 5 (GSM+CDMA)";
 if ([deviceString isEqualToString:@"iPhone5,3"]) return @"iPhone 5c (GSM)";
 if ([deviceString isEqualToString:@"iPhone5,4"]) return @"iPhone 5c (GSM+CDMA)";
 if ([deviceString isEqualToString:@"iPhone6,1"]) return @"iPhone 5s (GSM)";
 if ([deviceString isEqualToString:@"iPhone6,2"]) return @"iPhone 5s (GSM+CDMA)";
 if ([deviceString isEqualToString:@"iPhone7,1"]) return @"iPhone 6 Plus";
 if ([deviceString isEqualToString:@"iPhone7,2"]) return @"iPhone 6";
 if ([deviceString isEqualToString:@"iPhone8,1"]) return @"iPhone 6s";
 if ([deviceString isEqualToString:@"iPhone8,2"]) return @"iPhone 6s Plus";
 if ([deviceString isEqualToString:@"iPhone8,4"]) return @"iPhone SE";
 // 日行两款手机型号均为日本独占，可能使用索尼FeliCa支付方案而不是苹果支付
 if ([deviceString isEqualToString:@"iPhone9,1"]) return @"国行、日版、港行iPhone 7";
 if ([deviceString isEqualToString:@"iPhone9,2"]) return @"港行、国行iPhone 7 Plus";
 if ([deviceString isEqualToString:@"iPhone9,3"]) return @"美版、台版iPhone 7";
 if ([deviceString isEqualToString:@"iPhone9,4"]) return @"美版、台版iPhone 7 Plus";
 if ([deviceString isEqualToString:@"iPhone10,1"]) return @"国行(A1863)、日行(A1906)iPhone 8";
 if ([deviceString isEqualToString:@"iPhone10,4"]) return @"美版(Global/A1905)iPhone 8";
 if ([deviceString isEqualToString:@"iPhone10,2"]) return @"国行(A1864)、日行(A1898)iPhone 8 Plus";
 if ([deviceString isEqualToString:@"iPhone10,5"]) return @"美版(Global/A1897)iPhone 8 Plus";
 if ([deviceString isEqualToString:@"iPhone10,3"]) return @"国行(A1865)、日行(A1902)iPhone X";
 if ([deviceString isEqualToString:@"iPhone10,6"]) return @"美版(Global/A1901)iPhone X"; 
 if ([deviceString isEqualToString:@"iPod1,1"]) return @"iPod Touch 1G";
 if ([deviceString isEqualToString:@"iPod2,1"]) return @"iPod Touch 2G";
 if ([deviceString isEqualToString:@"iPod3,1"]) return @"iPod Touch 3G";
 if ([deviceString isEqualToString:@"iPod4,1"]) return @"iPod Touch 4G";
 if ([deviceString isEqualToString:@"iPod5,1"]) return @"iPod Touch (5 Gen)"; 
 if ([deviceString isEqualToString:@"iPad1,1"]) return @"iPad";
 if ([deviceString isEqualToString:@"iPad1,2"]) return @"iPad 3G";
 if ([deviceString isEqualToString:@"iPad2,1"]) return @"iPad 2 (WiFi)";
 if ([deviceString isEqualToString:@"iPad2,2"]) return @"iPad 2";
 if ([deviceString isEqualToString:@"iPad2,3"]) return @"iPad 2 (CDMA)";
 if ([deviceString isEqualToString:@"iPad2,4"]) return @"iPad 2";
 if ([deviceString isEqualToString:@"iPad2,5"]) return @"iPad Mini (WiFi)";
 if ([deviceString isEqualToString:@"iPad2,6"]) return @"iPad Mini";
 if ([deviceString isEqualToString:@"iPad2,7"]) return @"iPad Mini (GSM+CDMA)";
 if ([deviceString isEqualToString:@"iPad3,1"]) return @"iPad 3 (WiFi)";
 if ([deviceString isEqualToString:@"iPad3,2"]) return @"iPad 3 (GSM+CDMA)";
 if ([deviceString isEqualToString:@"iPad3,3"]) return @"iPad 3";
 if ([deviceString isEqualToString:@"iPad3,4"]) return @"iPad 4 (WiFi)";
 if ([deviceString isEqualToString:@"iPad3,5"]) return @"iPad 4";
 if ([deviceString isEqualToString:@"iPad3,6"]) return @"iPad 4 (GSM+CDMA)";
 if ([deviceString isEqualToString:@"iPad4,1"]) return @"iPad Air (WiFi)";
 if ([deviceString isEqualToString:@"iPad4,2"]) return @"iPad Air (Cellular)";
 if ([deviceString isEqualToString:@"iPad4,4"]) return @"iPad Mini 2 (WiFi)";
 if ([deviceString isEqualToString:@"iPad4,5"]) return @"iPad Mini 2 (Cellular)";
 if ([deviceString isEqualToString:@"iPad4,6"]) return @"iPad Mini 2";
 if ([deviceString isEqualToString:@"iPad4,7"]) return @"iPad Mini 3";
 if ([deviceString isEqualToString:@"iPad4,8"]) return @"iPad Mini 3";
 if ([deviceString isEqualToString:@"iPad4,9"]) return @"iPad Mini 3";
 if ([deviceString isEqualToString:@"iPad5,1"]) return @"iPad Mini 4 (WiFi)";
 if ([deviceString isEqualToString:@"iPad5,2"]) return @"iPad Mini 4 (LTE)";
 if ([deviceString isEqualToString:@"iPad5,3"]) return @"iPad Air 2";
 if ([deviceString isEqualToString:@"iPad5,4"]) return @"iPad Air 2";
 if ([deviceString isEqualToString:@"iPad6,3"]) return @"iPad Pro 9.7";
 if ([deviceString isEqualToString:@"iPad6,4"]) return @"iPad Pro 9.7";
 if ([deviceString isEqualToString:@"iPad6,7"]) return @"iPad Pro 12.9";
 if ([deviceString isEqualToString:@"iPad6,8"]) return @"iPad Pro 12.9";
 if ([machineString isEqualToString:@"iPad6,11"]) return @"iPad 5 (WiFi)";
 if ([machineString isEqualToString:@"iPad6,12"]) return @"iPad 5 (Cellular)";
 if ([machineString isEqualToString:@"iPad7,1"]) return @"iPad Pro 12.9 inch 2nd gen (WiFi)";
 if ([machineString isEqualToString:@"iPad7,2"]) return @"iPad Pro 12.9 inch 2nd gen (Cellular)";
 if ([machineString isEqualToString:@"iPad7,3"]) return @"iPad Pro 10.5 inch (WiFi)";
 if ([machineString isEqualToString:@"iPad7,4"]) return @"iPad Pro 10.5 inch (Cellular)"; 
 if ([deviceString isEqualToString:@"AppleTV2,1"]) return @"Apple TV 2";
 if ([deviceString isEqualToString:@"AppleTV3,1"]) return @"Apple TV 3";
 if ([deviceString isEqualToString:@"AppleTV3,2"]) return @"Apple TV 3";
 if ([deviceString isEqualToString:@"AppleTV5,3"]) return @"Apple TV 4";
 if ([deviceString isEqualToString:@"i386"]) return @"Simulator";
 if ([deviceString isEqualToString:@"x86_64"]) return @"Simulator";
 
 return deviceString;
}

获取 iPhone 设备颜色/外壳颜色

#warning 该方法是私有API，上线会被拒
// 由于每款手机同一颜色具体色号不一样，如 iPhone 6和 iPhone SE粉色的两个具体色值是不一样的，因此在这里只能返回一个色号
UIDevice *device = [UIDevice currentDevice];
SEL selector = NSSelectorFromString(@"deviceInfoForKey:");
if (![device respondsToSelector:selector]) {
 selector = NSSelectorFromString(@"_deviceInfoForKey:");
}
if ([device respondsToSelector:selector]) {
 // 消除警告“performSelector may cause a leak because its selector is unknown”
 IMP imp = [device methodForSelector:selector];
 NSString * (*func)(id, SEL, NSString *) = (void *)imp; 
 NSString *deviceColor = func(device, selector, @"DeviceColor");
 NSString *deviceEnclosureColor = func(device, selector, @"DeviceEnclosureColor");
 NSLog(@"deviceColor --> %@ \n @"deviceEnclosureColor --> %@ ", deviceColor, deviceEnclosureColor);
}

这里是一些已知的设备颜色

mac 地址

- (NSString *)getMacAddress {
 int mib[6];
 size_t len;
 char *buf;
 unsigned char *ptr;
 struct if_msghdr *ifm;
 struct sockaddr_dl *sdl; 
 mib[0] = CTL_NET;
 mib[1] = AF_ROUTE;
 mib[2] = 0;
 mib[3] = AF_LINK;
 mib[4] = NET_RT_IFLIST; 
 if ((mib[5] = if_nametoindex("en0")) == 0) {
 printf("Error: if_nametoindex error/n");
 return NULL;
 } 
 if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0) {
 printf("Error: sysctl, take 1/n");
 return NULL;
 } 
 if ((buf = malloc(len)) == NULL) {
 printf("Could not allocate memory. error!/n");
 return NULL;
 } 
 if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) {
 printf("Error: sysctl, take 2");
 return NULL;
 } 
 ifm = (struct if_msghdr *)buf;
 sdl = (struct sockaddr_dl *)(ifm + 1);
 ptr = (unsigned char *)LLADDR(sdl); 
 NSString *outstring = [NSString stringWithFormat:@"%02x%02x%02x%02x%02x%02x", *ptr, *(ptr+1), *(ptr+2), *(ptr+3), *(ptr+4), *(ptr+5)];
 free(buf); 
 return [outstring uppercaseString];
}

IP地址

- (NSString *)getDeviceIPAddresses { 
 int sockfd = socket(AF_INET, SOCK_DGRAM, 0); 
 NSMutableArray *ips = [NSMutableArray array]; 
 int BUFFERSIZE = 4096; 
 struct ifconf ifc; 
 char buffer[BUFFERSIZE], *ptr, lastname[IFNAMSIZ], *cptr; 
 struct ifreq *ifr, ifrcopy; 
 ifc.ifc_len = BUFFERSIZE;
 ifc.ifc_buf = buffer; 
 if (ioctl(sockfd, SIOCGIFCONF, &ifc) >= 0){ 
 for (ptr = buffer; ptr < buffer + ifc.ifc_len; ){  
  ifr = (struct ifreq *)ptr;
  int len = sizeof(struct sockaddr);
  
  if (ifr->ifr_addr.sa_len > len) {
  len = ifr->ifr_addr.sa_len;
  }  
  ptr += sizeof(ifr->ifr_name) + len;
  if (ifr->ifr_addr.sa_family != AF_INET) continue;
  if ((cptr = (char *)strchr(ifr->ifr_name, ':')) != NULL) *cptr = 0;
  if (strncmp(lastname, ifr->ifr_name, IFNAMSIZ) == 0) continue;
  
  memcpy(lastname, ifr->ifr_name, IFNAMSIZ);
  ifrcopy = *ifr;
  ioctl(sockfd, SIOCGIFFLAGS, &ifrcopy);
  
  if ((ifrcopy.ifr_flags & IFF_UP) == 0) continue;  
  NSString *ip = [NSString stringWithFormat:@"%s", inet_ntoa(((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr)];
  [ips addObject:ip];
 }
 } 
 close(sockfd);
 NSString *deviceIP = @""; 
 for (int i=0; i < ips.count; i++) {
 if (ips.count > 0) {
  deviceIP = [NSString stringWithFormat:@"%@",ips.lastObject];
 }
 }
 return deviceIP;
}

CPU

// CPU总数目
- (NSUInteger)getCPUCount {
 return [NSProcessInfo processInfo].activeProcessorCount;
}
// 已使用的CPU比例
- (float)getCPUUsage {
 float cpu = 0;
 NSArray *cpus = [self getPerCPUUsage];
 if (cpus.count == 0) return -1;
 for (NSNumber *n in cpus) {
 cpu += n.floatValue;
 }
 return cpu;
}
// 获取每个cpu的使用比例
- (NSArray *)getPerCPUUsage {
 processor_info_array_t _cpuInfo, _prevCPUInfo = nil;
 mach_msg_type_number_t _numCPUInfo, _numPrevCPUInfo = 0;
 unsigned _numCPUs;
 NSLock *_cpuUsageLock; 
 int _mib[2U] = { CTL_HW, HW_NCPU };
 size_t _sizeOfNumCPUs = sizeof(_numCPUs);
 int _status = sysctl(_mib, 2U, &_numCPUs, &_sizeOfNumCPUs, NULL, 0U);
 if (_status)
 _numCPUs = 1; 
 _cpuUsageLock = [[NSLock alloc] init]; 
 natural_t _numCPUsU = 0U;
 kern_return_t err = host_processor_info(mach_host_self(), PROCESSOR_CPU_LOAD_INFO, &_numCPUsU, &_cpuInfo, &_numCPUInfo);
 if (err == KERN_SUCCESS) {
 [_cpuUsageLock lock]; 
 NSMutableArray *cpus = [NSMutableArray new];
 for (unsigned i = 0U; i < _numCPUs; ++i) {
  Float32 _inUse, _total;
  if (_prevCPUInfo) {
  _inUse = (
    (_cpuInfo[(CPU_STATE_MAX * i) + CPU_STATE_USER] - _prevCPUInfo[(CPU_STATE_MAX * i) + CPU_STATE_USER])
    + (_cpuInfo[(CPU_STATE_MAX * i) + CPU_STATE_SYSTEM] - _prevCPUInfo[(CPU_STATE_MAX * i) + CPU_STATE_SYSTEM])
    + (_cpuInfo[(CPU_STATE_MAX * i) + CPU_STATE_NICE] - _prevCPUInfo[(CPU_STATE_MAX * i) + CPU_STATE_NICE])
    );
  _total = _inUse + (_cpuInfo[(CPU_STATE_MAX * i) + CPU_STATE_IDLE] - _prevCPUInfo[(CPU_STATE_MAX * i) + CPU_STATE_IDLE]);
  } else {
  _inUse = _cpuInfo[(CPU_STATE_MAX * i) + CPU_STATE_USER] + _cpuInfo[(CPU_STATE_MAX * i) + CPU_STATE_SYSTEM] + _cpuInfo[(CPU_STATE_MAX * i) + CPU_STATE_NICE];
  _total = _inUse + _cpuInfo[(CPU_STATE_MAX * i) + CPU_STATE_IDLE];
  }
  [cpus addObject:@(_inUse / _total)];
 } 
 [_cpuUsageLock unlock];
 if (_prevCPUInfo) {
  size_t prevCpuInfoSize = sizeof(integer_t) * _numPrevCPUInfo;
  vm_deallocate(mach_task_self(), (vm_address_t)_prevCPUInfo, prevCpuInfoSize);
 }
 return cpus;
 } else {
 return nil;
 }
}

Disk磁盘空间

// 获取磁盘总空间
- (int64_t)getTotalDiskSpace {
 NSError *error = nil;
 NSDictionary *attrs = [[NSFileManager defaultManager] attributesOfFileSystemForPath:NSHomeDirectory() error:&error];
 if (error) return -1;
 int64_t space = [[attrs objectForKey:NSFileSystemSize] longLongValue];
 if (space < 0) space = -1;
 return space;
}
// 获取未使用的磁盘空间
- (int64_t)getFreeDiskSpace {
 NSError *error = nil;
 NSDictionary *attrs = [[NSFileManager defaultManager] attributesOfFileSystemForPath:NSHomeDirectory() error:&error];
 if (error) return -1;
 int64_t space = [[attrs objectForKey:NSFileSystemFreeSize] longLongValue];
 if (space < 0) space = -1;
 return space;
}
// 获取已使用的磁盘空间
- (int64_t)getUsedDiskSpace {
 int64_t totalDisk = [self getTotalDiskSpace];
 int64_t freeDisk = [self getFreeDiskSpace];
 if (totalDisk < 0 || freeDisk < 0) return -1;
 int64_t usedDisk = totalDisk - freeDisk;
 if (usedDisk < 0) usedDisk = -1;
 return usedDisk;
}

Memory内存相关数据

// 系统总内存空间
- (int64_t)getTotalMemory {
 int64_t totalMemory = [[NSProcessInfo processInfo] physicalMemory];
 if (totalMemory < -1) totalMemory = -1;
 return totalMemory;
}
// 活跃的内存,正在使用或者很短时间内被使用过
- (int64_t)getActiveMemory {
 mach_port_t host_port = mach_host_self();
 mach_msg_type_number_t host_size = sizeof(vm_statistics_data_t) / sizeof(integer_t);
 vm_size_t page_size;
 vm_statistics_data_t vm_stat;
 kern_return_t kern; 
 kern = host_page_size(host_port, &page_size);
 if (kern != KERN_SUCCESS) return -1;
 kern = host_statistics(host_port, HOST_VM_INFO, (host_info_t)&vm_stat, &host_size);
 if (kern != KERN_SUCCESS) return -1;
 return vm_stat.active_count * page_size;
}
// 最近使用过,但是目前处于不活跃状态的内存
- (int64_t)getInActiveMemory {
 mach_port_t host_port = mach_host_self();
 mach_msg_type_number_t host_size = sizeof(vm_statistics_data_t) / sizeof(integer_t);
 vm_size_t page_size;
 vm_statistics_data_t vm_stat;
 kern_return_t kern; 
 kern = host_page_size(host_port, &page_size);
 if (kern != KERN_SUCCESS) return -1;
 kern = host_statistics(host_port, HOST_VM_INFO, (host_info_t)&vm_stat, &host_size);
 if (kern != KERN_SUCCESS) return -1;
 return vm_stat.inactive_count * page_size;
}
// 空闲的内存空间
- (int64_t)getFreeMemory {
 mach_port_t host_port = mach_host_self();
 mach_msg_type_number_t host_size = sizeof(vm_statistics_data_t) / sizeof(integer_t);
 vm_size_t page_size;
 vm_statistics_data_t vm_stat;
 kern_return_t kern; 
 kern = host_page_size(host_port, &page_size);
 if (kern != KERN_SUCCESS) return -1;
 kern = host_statistics(host_port, HOST_VM_INFO, (host_info_t)&vm_stat, &host_size);
 if (kern != KERN_SUCCESS) return -1;
 return vm_stat.free_count * page_size;
}
// 已使用的内存空间
- (int64_t)getUsedMemory {
 mach_port_t host_port = mach_host_self();
 mach_msg_type_number_t host_size = sizeof(vm_statistics_data_t) / sizeof(integer_t);
 vm_size_t page_size;
 vm_statistics_data_t vm_stat;
 kern_return_t kern; 
 kern = host_page_size(host_port, &page_size);
 if (kern != KERN_SUCCESS) return -1;
 kern = host_statistics(host_port, HOST_VM_INFO, (host_info_t)&vm_stat, &host_size);
 if (kern != KERN_SUCCESS) return -1;
 return page_size * (vm_stat.active_count + vm_stat.inactive_count + vm_stat.wire_count);
}
// 用来存放内核和数据结构的内存,framework、用户级别的应用无法分配
- (int64_t)getWiredMemory {
 mach_port_t host_port = mach_host_self();
 mach_msg_type_number_t host_size = sizeof(vm_statistics_data_t) / sizeof(integer_t);
 vm_size_t page_size;
 vm_statistics_data_t vm_stat;
 kern_return_t kern; 
 kern = host_page_size(host_port, &page_size);
 if (kern != KERN_SUCCESS) return -1;
 kern = host_statistics(host_port, HOST_VM_INFO, (host_info_t)&vm_stat, &host_size);
 if (kern != KERN_SUCCESS) return -1;
 return vm_stat.wire_count * page_size;
}
// 可释放的内存空间：内存吃紧自动释放，针对大对象存放所需的大块内存空间
- (int64_t)getPurgableMemory {
 mach_port_t host_port = mach_host_self();
 mach_msg_type_number_t host_size = sizeof(vm_statistics_data_t) / sizeof(integer_t);
 vm_size_t page_size;
 vm_statistics_data_t vm_stat;
 kern_return_t kern; 
 kern = host_page_size(host_port, &page_size);
 if (kern != KERN_SUCCESS) return -1;
 kern = host_statistics(host_port, HOST_VM_INFO, (host_info_t)&vm_stat, &host_size);
 if (kern != KERN_SUCCESS) return -1;
 return vm_stat.purgeable_count * page_size;
}

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