feat(storage): implement MMStorageTelemetryProvider for mounted volumes and capacity (Issue #9)

MacMonitor.xcodeproj/project.pbxproj

@@ -7,16 +7,22 @@
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+		78325870C7CD8312AECA2236 /* MMStorageTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MMStorageTests.swift; sourceTree = "<group>"; };
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@@ -79,6 +94,7 @@
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 				54787E6270EA7B9A1BE11359 /* Core */,
 				9844EC526E3527F6A582179F /* Hardware */,
+				8BF79E3BCB76E7A1669DC930 /* Telemetry */,
 				3E4A0B53C583BD0B7A68EACE /* UI */,
 			);
 			path = Sources;
@@ -112,6 +128,25 @@
 			path = Core;
 			sourceTree = "<group>";
 		};
+		78383CED205BCA772701AE48 /* CPU */ = {
+			isa = PBXGroup;
+			children = (
+				57845310A3D4EC67E48A3B11 /* MMCPULoadProvider.h */,
+				D68FC8100D08DB6202F46339 /* MMCPULoadProvider.m */,
+			);
+			path = CPU;
+			sourceTree = "<group>";
+		};
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+			isa = PBXGroup;
+			children = (
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+				EE2F5EFC9DC33CEDA79A131F /* Memory */,
+				B6EB3F6545276C40212C2992 /* Storage */,
+			);
+			path = Telemetry;
+			sourceTree = "<group>";
+		};
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 			isa = PBXGroup;
 			children = (
@@ -120,6 +155,15 @@
 			path = Hardware;
 			sourceTree = "<group>";
 		};
+		B6EB3F6545276C40212C2992 /* Storage */ = {
+			isa = PBXGroup;
+			children = (
+				46DE3AE12DAE26C4FE58034C /* MMStorageTelemetryProvider.h */,
+				6DCBCEA450103E2404761B78 /* MMStorageTelemetryProvider.m */,
+			);
+			path = Storage;
+			sourceTree = "<group>";
+		};
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 			isa = PBXGroup;
 			children = (
@@ -133,7 +177,10 @@
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 			children = (
 				2EC3EDFCD5C50CB352FCED87 /* MacMonitorTests.swift */,
+				4CE92B1A8D7FDBB6499448E1 /* MMCPULoadTests.swift */,
+				099DCF7EF03A58ADA40A94A1 /* MMMemoryTests.swift */,
 				940D608A1AF80F75584E744E /* MMSMCTests.swift */,
+				78325870C7CD8312AECA2236 /* MMStorageTests.swift */,
 			);
 			path = Tests;
 			sourceTree = "<group>";
@@ -159,6 +206,15 @@
 			name = Frameworks;
 			sourceTree = "<group>";
 		};
+		EE2F5EFC9DC33CEDA79A131F /* Memory */ = {
+			isa = PBXGroup;
+			children = (
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+				991AEEAF262F3C6BE930BC77 /* MMMemoryTelemetryProvider.m */,
+			);
+			path = Memory;
+			sourceTree = "<group>";
+		};
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@@ -234,7 +290,10 @@
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+				6201FD599FED061F6C736E8B /* MMMemoryTests.swift in Sources */,
 				EC9FA3E4A119277B89E73F8D /* MMSMCTests.swift in Sources */,
+				1B15F48F6B19E9EA4556ECD5 /* MMStorageTests.swift in Sources */,
 				9BCE74C5454F81EF80492E75 /* MacMonitorTests.swift in Sources */,
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 			runOnlyForDeploymentPostprocessing = 0;
@@ -245,7 +304,10 @@
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 				A9FCAEC0BF27A419DB148C4A /* ContentView.swift in Sources */,
 				CD91FC663B19DA1FEA3D49D7 /* MMAppleSMCClient.m in Sources */,
+				4419FE7554489B23976E2970 /* MMCPULoadProvider.m in Sources */,
+				B9C2D6574E808B517BA34C83 /* MMMemoryTelemetryProvider.m in Sources */,
 				1B3F1C8ABF0ADFAA290FF6F6 /* MMSMCParser.m in Sources */,
+				F2F7A141F2452EC1B4FB45D8 /* MMStorageTelemetryProvider.m in Sources */,
 				EAFAF5A10502D4ACC64F4720 /* MMTelemetryCoordinator.m in Sources */,
 				88387CDAE2AC1CC74EF89B57 /* MacMonitorApp.swift in Sources */,
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Sources/Bridging/MacMonitor-Bridging-Header.h

@@ -11,4 +11,9 @@
 #import "MMSMCParser.h"
 #import "MMAppleSMCClient.h"
 
+// Telemetry Providers
+#import "MMCPULoadProvider.h"
+#import "MMMemoryTelemetryProvider.h"
+#import "MMStorageTelemetryProvider.h"
+
 #endif /* MacMonitor_Bridging_Header_h */

Sources/Telemetry/CPU/MMCPULoadProvider.h

@@ -0,0 +1,31 @@
+#ifndef MMCPULoadProvider_h
+#define MMCPULoadProvider_h
+
+#import <Foundation/Foundation.h>
+#import <mach/mach.h>
+#import <mach/processor_info.h>
+#import "MMTelemetryProvider.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+/**
+ * MMCPULoadProvider
+ * Samples real-time Mach host processor CPU load ticks, per-core utilization percentages,
+ * and CPU operating frequency.
+ */
+@interface MMCPULoadProvider : NSObject <MMTelemetryProvider>
+
+@property (nonatomic, readonly) natural_t coreCount;
+
+/**
+ * Static calculator method facilitating deterministic unit testing with mock tick data.
+ */
++ (NSDictionary<NSString *, id> *)calculateLoadFromPreviousTicks:(const struct processor_cpu_load_info * _Nullable)prevTicks
+                                                    currentTicks:(const struct processor_cpu_load_info *)currTicks
+                                                       coreCount:(natural_t)coreCount;
+
+@end
+
+NS_ASSUME_NONNULL_END
+
+#endif /* MMCPULoadProvider_h */

Sources/Telemetry/CPU/MMCPULoadProvider.m

@@ -0,0 +1,201 @@
+#import "MMCPULoadProvider.h"
+#import <sys/sysctl.h>
+#import <os/lock.h>
+
+@interface MMCPULoadProvider () {
+    os_unfair_lock _lock;
+    processor_cpu_load_info_t _previousCpuInfo;
+    mach_msg_type_number_t _previousCpuInfoCount;
+    natural_t _coreCount;
+    uint64_t _maxFrequencyHz;
+}
+@end
+
+@implementation MMCPULoadProvider
+
+- (instancetype)init {
+    self = [super init];
+    if (self) {
+        _lock = OS_UNFAIR_LOCK_INIT;
+        _previousCpuInfo = NULL;
+        _previousCpuInfoCount = 0;
+        
+        // Read CPU core count
+        natural_t cCount = 1;
+        size_t size = sizeof(cCount);
+        sysctlbyname("hw.logicalcpu", &cCount, &size, NULL, 0);
+        _coreCount = cCount;
+        
+        // Read maximum frequency
+        uint64_t maxFreq = 0;
+        size = sizeof(maxFreq);
+        if (sysctlbyname("hw.cpufrequency_max", &maxFreq, &size, NULL, 0) != 0) {
+            sysctlbyname("hw.cpufrequency", &maxFreq, &size, NULL, 0);
+        }
+        _maxFrequencyHz = maxFreq;
+    }
+    return self;
+}
+
+- (void)dealloc {
+    if (_previousCpuInfo != NULL) {
+        free(_previousCpuInfo);
+        _previousCpuInfo = NULL;
+    }
+}
+
+- (MMTelemetryDomain)domain {
+    return MMTelemetryDomainCPU;
+}
+
+- (NSString *)providerIdentifier {
+    return @"com.i3omb.macmonitor.telemetry.cpuload";
+}
+
+- (BOOL)isAvailable {
+    return YES;
+}
+
+- (natural_t)coreCount {
+    return _coreCount;
+}
+
++ (NSDictionary<NSString *, id> *)calculateLoadFromPreviousTicks:(const struct processor_cpu_load_info * _Nullable)prevTicks
+                                                    currentTicks:(const struct processor_cpu_load_info *)currTicks
+                                                       coreCount:(natural_t)coreCount {
+    if (!currTicks || coreCount == 0) return @{};
+    
+    NSMutableArray<NSDictionary<NSString *, NSNumber *> *> *coresList = [NSMutableArray arrayWithCapacity:coreCount];
+    double totalUserPercent = 0.0;
+    double totalSystemPercent = 0.0;
+    double totalIdlePercent = 0.0;
+    double totalActivePercent = 0.0;
+    
+    for (natural_t i = 0; i < coreCount; i++) {
+        uint64_t user = currTicks[i].cpu_ticks[CPU_STATE_USER];
+        uint64_t system = currTicks[i].cpu_ticks[CPU_STATE_SYSTEM];
+        uint64_t idle = currTicks[i].cpu_ticks[CPU_STATE_IDLE];
+        uint64_t nice = currTicks[i].cpu_ticks[CPU_STATE_NICE];
+        
+        uint64_t deltaUser = 0;
+        uint64_t deltaSystem = 0;
+        uint64_t deltaIdle = 0;
+        uint64_t deltaNice = 0;
+        
+        if (prevTicks != NULL) {
+            deltaUser = (user >= prevTicks[i].cpu_ticks[CPU_STATE_USER]) ? (user - prevTicks[i].cpu_ticks[CPU_STATE_USER]) : 0;
+            deltaSystem = (system >= prevTicks[i].cpu_ticks[CPU_STATE_SYSTEM]) ? (system - prevTicks[i].cpu_ticks[CPU_STATE_SYSTEM]) : 0;
+            deltaIdle = (idle >= prevTicks[i].cpu_ticks[CPU_STATE_IDLE]) ? (idle - prevTicks[i].cpu_ticks[CPU_STATE_IDLE]) : 0;
+            deltaNice = (nice >= prevTicks[i].cpu_ticks[CPU_STATE_NICE]) ? (nice - prevTicks[i].cpu_ticks[CPU_STATE_NICE]) : 0;
+        }
+        
+        uint64_t deltaTotal = deltaUser + deltaSystem + deltaIdle + deltaNice;
+        double uPct = 0.0, sPct = 0.0, iPct = 100.0, aPct = 0.0;
+        
+        if (deltaTotal > 0) {
+            uPct = ((double)deltaUser / (double)deltaTotal) * 100.0;
+            sPct = ((double)deltaSystem / (double)deltaTotal) * 100.0;
+            iPct = ((double)deltaIdle / (double)deltaTotal) * 100.0;
+            aPct = 100.0 - iPct;
+            if (aPct < 0.0) aPct = 0.0;
+            if (aPct > 100.0) aPct = 100.0;
+        }
+        
+        totalUserPercent += uPct;
+        totalSystemPercent += sPct;
+        totalIdlePercent += iPct;
+        totalActivePercent += aPct;
+        
+        [coresList addObject:@{
+            @"coreIndex": @(i),
+            @"userPercent": @(uPct),
+            @"systemPercent": @(sPct),
+            @"idlePercent": @(iPct),
+            @"totalPercent": @(aPct)
+        }];
+    }
+    
+    double avgUser = coreCount > 0 ? (totalUserPercent / coreCount) : 0.0;
+    double avgSystem = coreCount > 0 ? (totalSystemPercent / coreCount) : 0.0;
+    double avgIdle = coreCount > 0 ? (totalIdlePercent / coreCount) : 100.0;
+    double avgTotal = coreCount > 0 ? (totalActivePercent / coreCount) : 0.0;
+    
+    return @{
+        @"cores": coresList,
+        @"coreCount": @(coreCount),
+        @"userPercent": @(avgUser),
+        @"systemPercent": @(avgSystem),
+        @"idlePercent": @(avgIdle),
+        @"totalPercent": @(avgTotal)
+    };
+}
+
+- (nullable NSDictionary<NSString *, id> *)sampleTelemetryWithError:(NSError **)error {
+    natural_t numCPUs = 0;
+    processor_info_array_t cpuInfo = NULL;
+    mach_msg_type_number_t numCpuInfo = 0;
+    
+    kern_return_t kr = host_processor_info(
+        mach_host_self(),
+        PROCESSOR_CPU_LOAD_INFO,
+        &numCPUs,
+        &cpuInfo,
+        &numCpuInfo
+    );
+    
+    if (kr != KERN_SUCCESS || cpuInfo == NULL) {
+        if (error) {
+            *error = [NSError errorWithDomain:@"com.i3omb.MacMonitor.CPU"
+                                         code:kr
+                                     userInfo:@{NSLocalizedDescriptionKey: @"host_processor_info failed to read CPU ticks"}];
+        }
+        return nil;
+    }
+    
+    os_unfair_lock_lock(&_lock);
+    
+    processor_cpu_load_info_t currentCpuInfo = (processor_cpu_load_info_t)cpuInfo;
+    NSDictionary<NSString *, id> *metrics = [MMCPULoadProvider calculateLoadFromPreviousTicks:_previousCpuInfo
+                                                                                 currentTicks:currentCpuInfo
+                                                                                    coreCount:numCPUs];
+    
+    // Free previous malloc buffer
+    if (_previousCpuInfo != NULL) {
+        free(_previousCpuInfo);
+        _previousCpuInfo = NULL;
+    }
+    
+    // Allocate new buffer to preserve state for the next delta
+    vm_size_t bufferSize = numCpuInfo * sizeof(integer_t);
+    _previousCpuInfo = (processor_cpu_load_info_t)malloc(bufferSize);
+    if (_previousCpuInfo != NULL) {
+        memcpy(_previousCpuInfo, cpuInfo, bufferSize);
+        _previousCpuInfoCount = numCpuInfo;
+    }
+    
+    // Deallocate the buffer returned by the kernel
+    vm_deallocate(mach_task_self(), (vm_address_t)cpuInfo, numCpuInfo * sizeof(integer_t));
+    
+    os_unfair_lock_unlock(&_lock);
+    
+    // Read current frequency
+    uint64_t currentFreq = 0;
+    size_t size = sizeof(currentFreq);
+    if (sysctlbyname("hw.cpufrequency", &currentFreq, &size, NULL, 0) != 0) {
+        currentFreq = _maxFrequencyHz;
+    }
+    
+    // Thermal State
+    NSProcessInfoThermalState thermalState = [NSProcessInfo processInfo].thermalState;
+    BOOL isThrottled = (thermalState >= NSProcessInfoThermalStateSerious);
+    
+    NSMutableDictionary<NSString *, id> *result = [metrics mutableCopy];
+    result[@"frequencyHz"] = @(currentFreq);
+    result[@"maxFrequencyHz"] = @(_maxFrequencyHz);
+    result[@"thermalState"] = @(thermalState);
+    result[@"isThrottled"] = @(isThrottled);
+    
+    return [result copy];
+}
+
+@end

Sources/Telemetry/Memory/MMMemoryTelemetryProvider.h

@@ -0,0 +1,32 @@
+#ifndef MMMemoryTelemetryProvider_h
+#define MMMemoryTelemetryProvider_h
+
+#import <Foundation/Foundation.h>
+#import <mach/mach.h>
+#import <sys/sysctl.h>
+#import "MMTelemetryProvider.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+/**
+ * MMMemoryTelemetryProvider
+ * Samples Mach virtual memory statistics, wired/active/inactive/compressed memory allocations,
+ * swap usage, and system-wide memory pressure levels.
+ */
+@interface MMMemoryTelemetryProvider : NSObject <MMTelemetryProvider>
+
+@property (nonatomic, readonly) uint64_t totalPhysicalMemoryBytes;
+
+/**
+ * Deterministic helper method for unit testing VM metric calculations.
+ */
++ (NSDictionary<NSString *, id> *)calculateMemoryMetricsWithVMInfo:(const vm_statistics64_data_t *)vmInfo
+                                                           pageSize:(vm_size_t)pageSize
+                                                   totalPhysicalRAM:(uint64_t)totalRAM
+                                                          swapUsage:(const struct xsw_usage * _Nullable)swap;
+
+@end
+
+NS_ASSUME_NONNULL_END
+
+#endif /* MMMemoryTelemetryProvider_h */

Sources/Telemetry/Memory/MMMemoryTelemetryProvider.m

@@ -0,0 +1,135 @@
+#import "MMMemoryTelemetryProvider.h"
+#import <sys/sysctl.h>
+
+@interface MMMemoryTelemetryProvider () {
+    uint64_t _totalPhysicalMemoryBytes;
+    vm_size_t _pageSize;
+}
+@end
+
+@implementation MMMemoryTelemetryProvider
+
+- (instancetype)init {
+    self = [super init];
+    if (self) {
+        // Read physical memory size
+        uint64_t memSize = 0;
+        size_t size = sizeof(memSize);
+        sysctlbyname("hw.memsize", &memSize, &size, NULL, 0);
+        _totalPhysicalMemoryBytes = memSize;
+        
+        // Read virtual memory page size
+        vm_size_t pSize = 4096;
+        host_page_size(mach_host_self(), &pSize);
+        _pageSize = pSize;
+    }
+    return self;
+}
+
+- (MMTelemetryDomain)domain {
+    return MMTelemetryDomainMemory;
+}
+
+- (NSString *)providerIdentifier {
+    return @"com.i3omb.macmonitor.telemetry.memory";
+}
+
+- (BOOL)isAvailable {
+    return YES;
+}
+
+- (uint64_t)totalPhysicalMemoryBytes {
+    return _totalPhysicalMemoryBytes;
+}
+
++ (NSDictionary<NSString *, id> *)calculateMemoryMetricsWithVMInfo:(const vm_statistics64_data_t *)vmInfo
+                                                           pageSize:(vm_size_t)pageSize
+                                                   totalPhysicalRAM:(uint64_t)totalRAM
+                                                          swapUsage:(const struct xsw_usage * _Nullable)swap {
+    if (!vmInfo) return @{};
+    
+    uint64_t appMemory = (vmInfo->internal_page_count > vmInfo->purgeable_count)
+        ? (uint64_t)(vmInfo->internal_page_count - vmInfo->purgeable_count) * pageSize
+        : 0;
+    uint64_t wired = (uint64_t)vmInfo->wire_count * pageSize;
+    uint64_t compressed = (uint64_t)vmInfo->compressor_page_count * pageSize;
+    uint64_t used = appMemory + wired + compressed;
+    
+    uint64_t freeRAM = (uint64_t)vmInfo->free_count * pageSize;
+    uint64_t purgeable = (uint64_t)vmInfo->purgeable_count * pageSize;
+    uint64_t active = (uint64_t)vmInfo->active_count * pageSize;
+    uint64_t inactive = (uint64_t)vmInfo->inactive_count * pageSize;
+    
+    // Calculate Memory Pressure percentage
+    uint64_t availableForUse = (uint64_t)(vmInfo->free_count + vmInfo->inactive_count) * pageSize;
+    double pressurePct = 0.0;
+    if (totalRAM > 0) {
+        pressurePct = (1.0 - ((double)availableForUse / (double)totalRAM)) * 100.0;
+        if (pressurePct < 0.0) pressurePct = 0.0;
+        if (pressurePct > 100.0) pressurePct = 100.0;
+    }
+    
+    NSString *pressureStatus = @"Normal";
+    if (pressurePct >= 80.0) {
+        pressureStatus = @"Critical";
+    } else if (pressurePct >= 60.0) {
+        pressureStatus = @"Warning";
+    }
+    
+    uint64_t swapTotal = swap ? swap->xsu_total : 0;
+    uint64_t swapUsed = swap ? swap->xsu_used : 0;
+    uint64_t swapFree = swap ? swap->xsu_avail : 0;
+    
+    return @{
+        @"totalBytes": @(totalRAM),
+        @"usedBytes": @(used),
+        @"freeBytes": @(freeRAM),
+        @"appMemoryBytes": @(appMemory),
+        @"wiredBytes": @(wired),
+        @"compressedBytes": @(compressed),
+        @"purgeableBytes": @(purgeable),
+        @"activeBytes": @(active),
+        @"inactiveBytes": @(inactive),
+        @"memoryPressurePercent": @(pressurePct),
+        @"memoryPressureStatus": pressureStatus,
+        @"swapTotalBytes": @(swapTotal),
+        @"swapUsedBytes": @(swapUsed),
+        @"swapFreeBytes": @(swapFree)
+    };
+}
+
+- (nullable NSDictionary<NSString *, id> *)sampleTelemetryWithError:(NSError **)error {
+    vm_statistics64_data_t vmInfo = {0};
+    mach_msg_type_number_t count = HOST_VM_INFO64_COUNT;
+    
+    kern_return_t kr = host_statistics64(
+        mach_host_self(),
+        HOST_VM_INFO64,
+        (host_info64_t)&vmInfo,
+        &count
+    );
+    
+    if (kr != KERN_SUCCESS) {
+        if (error) {
+            *error = [NSError errorWithDomain:@"com.i3omb.MacMonitor.Memory"
+                                         code:kr
+                                     userInfo:@{NSLocalizedDescriptionKey: @"host_statistics64 failed to sample VM metrics"}];
+        }
+        return nil;
+    }
+    
+    // Read swap usage
+    struct xsw_usage swap = {0};
+    size_t swapSize = sizeof(swap);
+    struct xsw_usage *swapPtr = NULL;
+    if (sysctlbyname("vm.swapusage", &swap, &swapSize, NULL, 0) == 0) {
+        swapPtr = &swap;
+    }
+    
+    return [MMMemoryTelemetryProvider calculateMemoryMetricsWithVMInfo:&vmInfo
+                                                              pageSize:_pageSize
+                                                      totalPhysicalRAM:_totalPhysicalMemoryBytes
+                                                             swapUsage:swapPtr];
+}
+
+@end

Sources/Telemetry/Storage/MMStorageTelemetryProvider.h

@@ -0,0 +1,26 @@
+#ifndef MMStorageTelemetryProvider_h
+#define MMStorageTelemetryProvider_h
+
+#import <Foundation/Foundation.h>
+#import <sys/mount.h>
+#import "MMTelemetryProvider.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+/**
+ * MMStorageTelemetryProvider
+ * Samples mounted disk volumes, APFS containers, used/free storage capacity,
+ * and mount filesystem attributes.
+ */
+@interface MMStorageTelemetryProvider : NSObject <MMTelemetryProvider>
+
+/**
+ * Static parser method for converting statfs structures into volume dictionaries.
+ */
++ (NSArray<NSDictionary<NSString *, id> *> *)parseStatFSBuffer:(const struct statfs *)buffer count:(int)count;
+
+@end
+
+NS_ASSUME_NONNULL_END
+
+#endif /* MMStorageTelemetryProvider_h */

Sources/Telemetry/Storage/MMStorageTelemetryProvider.m

@@ -0,0 +1,108 @@
+#import "MMStorageTelemetryProvider.h"
+
+@implementation MMStorageTelemetryProvider
+
+- (MMTelemetryDomain)domain {
+    return MMTelemetryDomainStorage;
+}
+
+- (NSString *)providerIdentifier {
+    return @"com.i3omb.macmonitor.telemetry.storage";
+}
+
+- (BOOL)isAvailable {
+    return YES;
+}
+
++ (NSArray<NSDictionary<NSString *, id> *> *)parseStatFSBuffer:(const struct statfs *)buffer count:(int)count {
+    if (!buffer || count <= 0) return @[];
+    
+    NSMutableArray<NSDictionary<NSString *, id> *> *volumes = [NSMutableArray arrayWithCapacity:count];
+    
+    for (int i = 0; i < count; i++) {
+        const struct statfs *mnt = &buffer[i];
+        
+        // Only include local mounts
+        if (!(mnt->f_flags & MNT_LOCAL)) {
+            continue;
+        }
+        
+        NSString *mountPoint = [NSString stringWithUTF8String:mnt->f_mntonname];
+        NSString *deviceName = [NSString stringWithUTF8String:mnt->f_mntfromname];
+        NSString *fsType = [NSString stringWithUTF8String:mnt->f_fstypename];
+        
+        // Exclude virtual/internal devfs, autodefs, and synthetic system roots
+        if ([fsType isEqualToString:@"devfs"] ||
+            [fsType isEqualToString:@"autofs"] ||
+            [mountPoint hasPrefix:@"/System/Volumes/Data/"] ||
+            [deviceName containsString:@"com.apple.os.update"]) {
+            continue;
+        }
+        
+        uint64_t blockSize = (uint64_t)mnt->f_bsize;
+        uint64_t totalBytes = (uint64_t)mnt->f_blocks * blockSize;
+        uint64_t freeBytes = (uint64_t)mnt->f_bfree * blockSize;
+        uint64_t availBytes = (uint64_t)mnt->f_bavail * blockSize;
+        uint64_t usedBytes = (totalBytes >= freeBytes) ? (totalBytes - freeBytes) : 0;
+        
+        if (totalBytes == 0) continue;
+        
+        double usedPercent = ((double)usedBytes / (double)totalBytes) * 100.0;
+        if (usedPercent < 0.0) usedPercent = 0.0;
+        if (usedPercent > 100.0) usedPercent = 100.0;
+        
+        NSString *volumeName = [mountPoint lastPathComponent];
+        if ([mountPoint isEqualToString:@"/"]) {
+            volumeName = @"Macintosh HD";
+        }
+        
+        BOOL isReadOnly = (mnt->f_flags & MNT_RDONLY) != 0;
+        
+        [volumes addObject:@{
+            @"volumeName": volumeName,
+            @"mountPoint": mountPoint,
+            @"devicePath": deviceName,
+            @"fsType": fsType,
+            @"totalBytes": @(totalBytes),
+            @"usedBytes": @(usedBytes),
+            @"freeBytes": @(freeBytes),
+            @"availableBytes": @(availBytes),
+            @"usedPercent": @(usedPercent),
+            @"isReadOnly": @(isReadOnly)
+        }];
+    }
+    
+    return [volumes copy];
+}
+
+- (nullable NSDictionary<NSString *, id> *)sampleTelemetryWithError:(NSError **)error {
+    struct statfs *mntbuf = NULL;
+    int count = getmntinfo(&mntbuf, MNT_WAIT);
+    
+    if (count <= 0 || mntbuf == NULL) {
+        if (error) {
+            *error = [NSError errorWithDomain:@"com.i3omb.MacMonitor.Storage"
+                                         code:-1
+                                     userInfo:@{NSLocalizedDescriptionKey: @"getmntinfo returned no mounted filesystems"}];
+        }
+        return nil;
+    }
+    
+    NSArray *volumes = [MMStorageTelemetryProvider parseStatFSBuffer:mntbuf count:count];
+    
+    uint64_t totalStorage = 0;
+    uint64_t totalUsed = 0;
+    for (NSDictionary *v in volumes) {
+        totalStorage += [v[@"totalBytes"] unsignedLongLongValue];
+        totalUsed += [v[@"usedBytes"] unsignedLongLongValue];
+    }
+    
+    return @{
+        @"volumes": volumes,
+        @"volumeCount": @(volumes.count),
+        @"aggregateTotalBytes": @(totalStorage),
+        @"aggregateUsedBytes": @(totalUsed)
+    };
+}
+
+@end

Tests/MMCPULoadTests.swift

@@ -0,0 +1,65 @@
+import XCTest
+@testable import MacMonitor
+
+final class MMCPULoadTests: XCTestCase {
+    
+    func testTickDeltaCalculation() {
+        var prevTicks = [processor_cpu_load_info_data_t]()
+        var currTicks = [processor_cpu_load_info_data_t]()
+        
+        // Setup mock Core 0: 20% user, 10% system, 70% idle
+        var core0Prev = processor_cpu_load_info_data_t()
+        core0Prev.cpu_ticks.0 = 100 // USER
+        core0Prev.cpu_ticks.1 = 50  // SYSTEM
+        core0Prev.cpu_ticks.2 = 850 // IDLE
+        core0Prev.cpu_ticks.3 = 0   // NICE
+        prevTicks.append(core0Prev)
+        
+        var core0Curr = processor_cpu_load_info_data_t()
+        core0Curr.cpu_ticks.0 = 300 // USER (+200)
+        core0Curr.cpu_ticks.1 = 150 // SYSTEM (+100)
+        core0Curr.cpu_ticks.2 = 1550 // IDLE (+700)
+        core0Curr.cpu_ticks.3 = 0   // NICE (+0)
+        currTicks.append(core0Curr)
+        
+        prevTicks.withUnsafeBufferPointer { prevBuf in
+            currTicks.withUnsafeBufferPointer { currBuf in
+                let metrics = MMCPULoadProvider.calculateLoad(
+                    fromPreviousTicks: prevBuf.baseAddress,
+                    currentTicks: currBuf.baseAddress!,
+                    coreCount: 1
+                )
+                
+                let totalPct = metrics["totalPercent"] as? Double ?? 0
+                let userPct = metrics["userPercent"] as? Double ?? 0
+                let systemPct = metrics["systemPercent"] as? Double ?? 0
+                let idlePct = metrics["idlePercent"] as? Double ?? 0
+                
+                // Total delta = 200 + 100 + 700 = 1000
+                // User = 20%, System = 10%, Idle = 70%, Total Active = 30%
+                XCTAssertEqual(totalPct, 30.0, accuracy: 0.1)
+                XCTAssertEqual(userPct, 20.0, accuracy: 0.1)
+                XCTAssertEqual(systemPct, 10.0, accuracy: 0.1)
+                XCTAssertEqual(idlePct, 70.0, accuracy: 0.1)
+            }
+        }
+    }
+    
+    func testLiveCPULoadProvider() throws {
+        let provider = MMCPULoadProvider()
+        XCTAssertTrue(provider.isAvailable)
+        XCTAssertEqual(provider.domain, .cpu)
+        XCTAssertGreaterThan(provider.coreCount, 0)
+        
+        // Initial sample establishes baseline
+        let sample1 = try provider.sampleTelemetry()
+        XCTAssertNotNil(sample1)
+        
+        // Second sample produces live deltas
+        usleep(100_000) // 100ms
+        let sample2 = try provider.sampleTelemetry()
+        let cores = sample2["cores"] as? [[String: Any]]
+        XCTAssertNotNil(cores)
+        XCTAssertEqual(cores?.count, Int(provider.coreCount))
+    }
+}

Tests/MMMemoryTests.swift

@@ -0,0 +1,64 @@
+import XCTest
+@testable import MacMonitor
+
+final class MMMemoryTests: XCTestCase {
+    
+    func testMemoryMetricCalculation() {
+        var vmInfo = vm_statistics64_data_t()
+        let pageSize: vm_size_t = 4096
+        let totalRAM: UInt64 = 16 * 1024 * 1024 * 1024 // 16 GB
+        
+        // 1GB wired (262144 pages), 2GB app (524288 pages), 1GB compressed (262144 pages)
+        vmInfo.wire_count = 262_144
+        vmInfo.internal_page_count = 524_288
+        vmInfo.purgeable_count = 0
+        vmInfo.compressor_page_count = 262_144
+        vmInfo.active_count = 524_288
+        vmInfo.inactive_count = 1_048_576 // 4GB
+        vmInfo.free_count = 2_097_152     // 8GB
+        
+        var swap = xsw_usage()
+        swap.xsu_total = 2 * 1024 * 1024 * 1024
+        swap.xsu_used = 512 * 1024 * 1024
+        swap.xsu_avail = swap.xsu_total - swap.xsu_used
+        
+        withUnsafePointer(to: vmInfo) { vmPtr in
+            withUnsafePointer(to: swap) { swapPtr in
+                let metrics = MMMemoryTelemetryProvider.calculateMemoryMetrics(
+                    withVMInfo: vmPtr,
+                    pageSize: pageSize,
+                    totalPhysicalRAM: totalRAM,
+                    swapUsage: swapPtr
+                )
+                
+                let wired = metrics["wiredBytes"] as? UInt64 ?? 0
+                let app = metrics["appMemoryBytes"] as? UInt64 ?? 0
+                let compressed = metrics["compressedBytes"] as? UInt64 ?? 0
+                let used = metrics["usedBytes"] as? UInt64 ?? 0
+                let pressureStatus = metrics["memoryPressureStatus"] as? String ?? ""
+                
+                XCTAssertEqual(wired, 1024 * 1024 * 1024)
+                XCTAssertEqual(app, 2 * 1024 * 1024 * 1024)
+                XCTAssertEqual(compressed, 1024 * 1024 * 1024)
+                XCTAssertEqual(used, 4 * 1024 * 1024 * 1024)
+                XCTAssertEqual(pressureStatus, "Normal")
+            }
+        }
+    }
+    
+    func testLiveMemoryProvider() throws {
+        let provider = MMMemoryTelemetryProvider()
+        XCTAssertTrue(provider.isAvailable)
+        XCTAssertEqual(provider.domain, .memory)
+        XCTAssertGreaterThan(provider.totalPhysicalMemoryBytes, 0)
+        
+        let sample = try provider.sampleTelemetry()
+        let total = sample["totalBytes"] as? UInt64 ?? 0
+        let used = sample["usedBytes"] as? UInt64 ?? 0
+        let free = sample["freeBytes"] as? UInt64 ?? 0
+        
+        XCTAssertGreaterThan(total, 0)
+        XCTAssertGreaterThan(used, 0)
+        XCTAssertGreaterThanOrEqual(free, 0)
+    }
+}

Tests/MMStorageTests.swift

@@ -0,0 +1,64 @@
+import XCTest
+@testable import MacMonitor
+
+final class MMStorageTests: XCTestCase {
+    
+    func testStatFSBufferParsing() {
+        var stat = statfs()
+        stat.f_bsize = 4096
+        stat.f_blocks = 125_000_000 // 500 GB
+        stat.f_bfree = 50_000_000   // 200 GB
+        stat.f_bavail = 45_000_000
+        stat.f_flags = UInt32(MNT_LOCAL)
+        
+        let mountPath = "/Volumes/External"
+        let devicePath = "/dev/disk2s1"
+        let fsType = "apfs"
+        
+        _ = mountPath.withCString { mntPtr in
+            strncpy(&stat.f_mntonname.0, mntPtr, Int(MNAMELEN))
+        }
+        _ = devicePath.withCString { devPtr in
+            strncpy(&stat.f_mntfromname.0, devPtr, Int(MNAMELEN))
+        }
+        _ = fsType.withCString { fsPtr in
+            strncpy(&stat.f_fstypename.0, fsPtr, Int(MFSTYPENAMELEN))
+        }
+        
+        withUnsafePointer(to: stat) { ptr in
+            let volumes = MMStorageTelemetryProvider.parseStatFSBuffer(ptr, count: 1)
+            XCTAssertEqual(volumes.count, 1)
+            
+            let vol = volumes.first!
+            XCTAssertEqual(vol["volumeName"] as? String, "External")
+            XCTAssertEqual(vol["mountPoint"] as? String, "/Volumes/External")
+            XCTAssertEqual(vol["devicePath"] as? String, "/dev/disk2s1")
+            XCTAssertEqual(vol["fsType"] as? String, "apfs")
+            
+            let total = vol["totalBytes"] as? UInt64 ?? 0
+            let free = vol["freeBytes"] as? UInt64 ?? 0
+            let used = vol["usedBytes"] as? UInt64 ?? 0
+            let pct = vol["usedPercent"] as? Double ?? 0
+            
+            XCTAssertEqual(total, 512_000_000_000)
+            XCTAssertEqual(free, 204_800_000_000)
+            XCTAssertEqual(used, 307_200_000_000)
+            XCTAssertEqual(pct, 60.0, accuracy: 0.1)
+        }
+    }
+    
+    func testLiveStorageProvider() throws {
+        let provider = MMStorageTelemetryProvider()
+        XCTAssertTrue(provider.isAvailable)
+        XCTAssertEqual(provider.domain, .storage)
+        
+        let sample = try provider.sampleTelemetry()
+        let volumes = sample["volumes"] as? [[String: Any]]
+        XCTAssertNotNil(volumes)
+        XCTAssertGreaterThan(volumes?.count ?? 0, 0)
+        
+        let firstVol = volumes?.first
+        XCTAssertNotNil(firstVol?["mountPoint"])
+        XCTAssertGreaterThan(firstVol?["totalBytes"] as? UInt64 ?? 0, 0)
+    }
+}