Add support for MacOSX

Implements #2

.clang-format

@@ -0,0 +1 @@
+ColumnLimit: 140

README.md

@@ -5,6 +5,8 @@ Smart.go tries to match functionality provided by [smartctl](https://www.smartmo
 
 Currently this library support SATA, SCSI and NVMe drives. Different drive types provide different set of monitoring information and API reflects it.
 
+At this point the library works at Linux and partialy at MacOSX. We are looking for help with porting it to other platforms.
+
 ## Example
 
 Here is an example of code that demonstrates the library usage.

examples/nvme_darwin_test.go

@@ -0,0 +1,38 @@
+package test
+
+import (
+	"bytes"
+	"fmt"
+	"os/exec"
+	"testing"
+
+	"github.com/anatol/smart.go"
+	"github.com/stretchr/testify/require"
+)
+
+func TestNVMe(t *testing.T) {
+	path := "disk0"
+
+	out, err := exec.Command("smartctl", "-a", path).CombinedOutput()
+	fmt.Println(string(out))
+	//require.NoError(t, err)  it fails at macosx because of GetLogPage()
+
+	dev, err := smart.OpenNVMe(path)
+	require.NoError(t, err)
+	defer dev.Close()
+
+	c, ns, err := dev.Identify()
+	require.NoError(t, err)
+
+	require.Equal(t, 0x106b, int(c.VendorID))
+	require.Equal(t, 0x106b, int(c.Ssvid))
+	require.Contains(t, string(bytes.TrimSpace(c.ModelNumber[:])), "APPLE SSD")
+	require.Equal(t, 1, int(c.Nn))
+
+	require.Len(t, ns, 1)
+	require.Equal(t, 244276265, int(ns[0].Nsze))
+
+	sm, err := dev.ReadSMART()
+	require.NoError(t, err)
+	require.Less(t, uint16(300), sm.Temperature)
+}

examples/other_test.go

@@ -1,6 +1,6 @@
-// go:build !linux
-//go:build !linux
-// +build !linux
+// go:build !linux&& !darwin
+//go:build !linux && !darwin
+// +build !linux,!darwin
 
 package test
 

nvme.go

@@ -1188,10 +1188,29 @@ const (
 	nvmeLogDeviceSelftest    = 0x6
 )
 
-type NVMeDevice struct {
-	fd int
-}
-
 func (d *NVMeDevice) Type() string {
 	return "nvme"
 }
+
+func (d *NVMeDevice) Identify() (*NvmeIdentController, []NvmeIdentNamespace, error) {
+	controller, err := d.readControllerIdentifyData()
+	if err != nil {
+		return nil, nil, err
+	}
+
+	var ns []NvmeIdentNamespace
+	// QEMU has 256 namespaces for some reason, TODO: clarify
+	for i := 0; i < int(controller.Nn); i++ {
+		namespace, err := d.readNamespaceIdentifyData(i + 1)
+		if err != nil {
+			return nil, nil, err
+		}
+		if namespace.Nsze == 0 {
+			continue
+		}
+
+		ns = append(ns, *namespace)
+	}
+
+	return controller, ns, nil
+}

nvme_darwin.cpp

@@ -0,0 +1,89 @@
+// SPDX-License-Identifier: MIT
+
+#include "nvme_darwin.h"
+
+static bool is_smart_capable(io_object_t dev) {
+  CFTypeRef smartCapableKey = IORegistryEntryCreateCFProperty(dev, CFSTR(kIOPropertyNVMeSMARTCapableKey), kCFAllocatorDefault, 0);
+  if (smartCapableKey) {
+    CFRelease(smartCapableKey);
+    return true;
+  }
+
+  return false;
+}
+
+// *path is a string that has a format like "disk0".
+unsigned int smart_nvme_open_darwin(const char *path, smart_nvme_darwin *nvme) {
+  // see also https://gist.github.com/AlanQuatermain/250538
+  SInt32 score = 0;
+  IOReturn kr;
+  HRESULT hr;
+
+  CFMutableDictionaryRef matcher = IOBSDNameMatching(kIOMasterPortDefault, 0, path);
+  io_object_t disk = IOServiceGetMatchingService(kIOMasterPortDefault, matcher);
+
+  while (!is_smart_capable(disk)) {
+    io_object_t prevdisk = disk;
+
+    // Find this device's parent and try again.
+    IOReturn err = IORegistryEntryGetParentEntry(disk, kIOServicePlane, &disk);
+    if (err != kIOReturnSuccess || !disk) {
+      IOObjectRelease(prevdisk);
+      break;
+    }
+  }
+
+  if (!disk) {
+    printf("no disk found");
+    goto exit1;
+  }
+
+  nvme->disk = disk;
+
+  kr = IOCreatePlugInInterfaceForService(nvme->disk, kIONVMeSMARTUserClientTypeID, kIOCFPlugInInterfaceID, &nvme->plugin, &score);
+
+  if (kr != kIOReturnSuccess)
+    goto exit2;
+
+  hr = (*nvme->plugin)->QueryInterface(nvme->plugin, CFUUIDGetUUIDBytes(kIONVMeSMARTInterfaceID), (void **)&nvme->smartIfNVMe);
+  if (hr != S_OK)
+    goto exit3;
+
+  return 0;
+
+exit3:
+  IODestroyPlugInInterface(nvme->plugin);
+  nvme->plugin = NULL;
+exit2:
+  IOObjectRelease(nvme->disk);
+  nvme->disk = 0;
+exit1:
+  return -1;
+}
+
+unsigned int smart_nvme_identify_darwin(smart_nvme_darwin *nvme, void *buffer, unsigned int nsid) {
+  IOReturn err = (*nvme->smartIfNVMe)->GetIdentifyData(nvme->smartIfNVMe, buffer, nsid);
+  if (err)
+    return ENOSYS;
+
+  return 0;
+}
+
+unsigned int smart_nvme_readsmart_darwin(smart_nvme_darwin *nvme, void *buffer) {
+  IOReturn err = (*nvme->smartIfNVMe)->SMARTReadData(nvme->smartIfNVMe, (struct NVMeSMARTData *)buffer);
+  if (err)
+    return ENOSYS;
+
+  return 0;
+}
+
+void smart_nvme_close_darwin(smart_nvme_darwin *nvme) {
+  (*nvme->smartIfNVMe)->Release(nvme->smartIfNVMe);
+  nvme->smartIfNVMe = NULL;
+
+  IODestroyPlugInInterface(nvme->plugin);
+  nvme->plugin = NULL;
+
+  IOObjectRelease(nvme->disk);
+  nvme->disk = 0;
+}

nvme_darwin.go

@@ -0,0 +1,66 @@
+package smart
+
+// #cgo darwin LDFLAGS: -framework IOKit -framework CoreFoundation
+// #include "nvme_darwin.h"
+import "C"
+
+import (
+	"bytes"
+	"encoding/binary"
+	"fmt"
+	"unsafe"
+)
+
+type NVMeDevice struct {
+	data C.smart_nvme_darwin
+}
+
+func OpenNVMe(name string) (*NVMeDevice, error) {
+	dev := NVMeDevice{}
+
+	if res := C.smart_nvme_open_darwin(C.CString(name), &dev.data); res != 0 {
+		return nil, fmt.Errorf("open darwin device error: 0x%x", res)
+	}
+
+	return &dev, nil
+}
+
+func (d *NVMeDevice) Close() error {
+	C.smart_nvme_close_darwin(&d.data)
+	return nil
+}
+
+func (d *NVMeDevice) ReadSMART() (*NvmeSMARTLog, error) {
+	buf := make([]byte, 512)
+	if err := C.smart_nvme_readsmart_darwin(&d.data, unsafe.Pointer(&buf[0])); err != 0 {
+		return nil, fmt.Errorf("smart_nvme_readsmart_darwin: %v", err)
+	}
+	var sl NvmeSMARTLog
+	if err := binary.Read(bytes.NewBuffer(buf), binary.LittleEndian, &sl); err != nil {
+		return nil, err
+	}
+
+	return &sl, nil
+}
+
+func (d *NVMeDevice) readControllerIdentifyData() (*NvmeIdentController, error) {
+	buf := make([]byte, 4096)
+	if err := C.smart_nvme_identify_darwin(&d.data, unsafe.Pointer(&buf[0]), 0); err != 0 {
+		return nil, fmt.Errorf("smart_nvme_identify_darwin: %v", err)
+	}
+	var controller NvmeIdentController
+	if err := binary.Read(bytes.NewBuffer(buf), binary.LittleEndian, &controller); err != nil {
+		return nil, err
+	}
+
+	return &controller, nil
+}
+
+func (d *NVMeDevice) readNamespaceIdentifyData(nsid int) (*NvmeIdentNamespace, error) {
+	var n NvmeIdentNamespace
+	if err := C.smart_nvme_identify_darwin(&d.data, unsafe.Pointer(&n), C.uint(nsid)); err != 0 {
+		return nil, fmt.Errorf("smart_nvme_identify_darwin: %X", err)
+	}
+
+	return &n, nil
+}

nvme_darwin.h

@@ -0,0 +1,25 @@
+// SPDX-License-Identifier: MIT
+
+#include <CoreFoundation/CoreFoundation.h>
+#include <IOKit/IOCFPlugIn.h>
+#include <IOKit/IOKitLib.h>
+#include <IOKit/storage/nvme/NVMeSMARTLibExternal.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct smart_nvme_darwin {
+  IONVMeSMARTInterface **smartIfNVMe;
+  IOCFPlugInInterface **plugin;
+  io_object_t disk;
+} smart_nvme_darwin;
+
+unsigned int smart_nvme_open_darwin(const char *path, smart_nvme_darwin *nvme);
+unsigned int smart_nvme_identify_darwin(smart_nvme_darwin *nvme, void *buffer, unsigned int nsid);
+unsigned int smart_nvme_readsmart_darwin(smart_nvme_darwin *nvme, void *buffer);
+void smart_nvme_close_darwin(smart_nvme_darwin *nvme);
+
+#ifdef __cplusplus
+}
+#endif

nvme_linux.go

@@ -38,6 +38,10 @@ type nvmePassthruCmd64 struct {
 	result      uint64
 }
 
+type NVMeDevice struct {
+	fd int
+}
+
 func OpenNVMe(name string) (*NVMeDevice, error) {
 	fd, err := unix.Open(name, unix.O_RDWR, 0600)
 	if err != nil {
@@ -54,44 +58,13 @@ func (d *NVMeDevice) Close() error {
 	return unix.Close(d.fd)
 }
 
-func (d *NVMeDevice) Identify() (*NvmeIdentController, []NvmeIdentNamespace, error) {
-	buf := make([]byte, 4096)
-	if err := nvmeReadIdentify(d.fd, 0, 1, buf); err != nil {
-		return nil, nil, err
-	}
-	var controller NvmeIdentController
-	if err := binary.Read(bytes.NewBuffer(buf), binary.LittleEndian, &controller); err != nil {
-		return nil, nil, err
-	}
-
-	var ns []NvmeIdentNamespace
-	// QEMU has 256 namespaces for some reason, TODO: clarify
-	for i := 0; i < int(controller.Nn); i++ {
-		buf2 := make([]byte, 4096)
-		var n NvmeIdentNamespace
-		if err := nvmeReadIdentify(d.fd, uint32(i+1), 0, buf2); err != nil {
-			return nil, nil, err
-		}
-		if err := binary.Read(bytes.NewBuffer(buf2), binary.LittleEndian, &n); err != nil {
-			return nil, nil, err
-		}
-		if n.Nsze == 0 {
-			continue
-		}
-
-		ns = append(ns, n)
-	}
-
-	return &controller, ns, nil
-}
-
 func (d *NVMeDevice) ReadSMART() (*NvmeSMARTLog, error) {
-	buf3 := make([]byte, 512)
-	if err := nvmeReadLogPage(d.fd, nvmeLogSmartInformation, buf3); err != nil {
+	buf := make([]byte, 512)
+	if err := nvmeReadLogPage(d.fd, nvmeLogSmartInformation, buf); err != nil {
 		return nil, err
 	}
 	var sl NvmeSMARTLog
-	if err := binary.Read(bytes.NewBuffer(buf3), binary.LittleEndian, &sl); err != nil {
+	if err := binary.Read(bytes.NewBuffer(buf), binary.LittleEndian, &sl); err != nil {
 		return nil, err
 	}
 
@@ -116,14 +89,40 @@ func nvmeReadLogPage(fd int, logID uint8, buf []byte) error {
 	return ioctl(uintptr(fd), nvmeIoctlAdmin64Cmd, uintptr(unsafe.Pointer(&cmd)))
 }
 
-func nvmeReadIdentify(fd int, nsid, cns uint32, data []byte) error {
+func (d *NVMeDevice) readIdentifyData(nsid, cns int, data []byte) error {
 	cmd := nvmePassthruCmd64{
 		opcode:  nvmeAdminIdentify,
-		nsid:    nsid,
+		nsid:    uint32(nsid),
 		addr:    uint64(uintptr(unsafe.Pointer(&data[0]))),
 		dataLen: uint32(len(data)),
-		cdw10:   cns,
+		cdw10:   uint32(cns),
 	}
 
-	return ioctl(uintptr(fd), nvmeIoctlAdmin64Cmd, uintptr(unsafe.Pointer(&cmd)))
+	return ioctl(uintptr(d.fd), nvmeIoctlAdmin64Cmd, uintptr(unsafe.Pointer(&cmd)))
+}
+
+func (d *NVMeDevice) readControllerIdentifyData() (*NvmeIdentController, error) {
+	buf := make([]byte, 4096)
+	if err := d.readIdentifyData(0, 1, buf); err != nil {
+		return nil, err
+	}
+	var controller NvmeIdentController
+	if err := binary.Read(bytes.NewBuffer(buf), binary.LittleEndian, &controller); err != nil {
+		return nil, err
+	}
+
+	return &controller, nil
+}
+
+func (d *NVMeDevice) readNamespaceIdentifyData(nsid int) (*NvmeIdentNamespace, error) {
+	buf := make([]byte, 4096)
+	if err := d.readIdentifyData(nsid, 0, buf); err != nil {
+		return nil, err
+	}
+	var namespace NvmeIdentNamespace
+	if err := binary.Read(bytes.NewBuffer(buf), binary.LittleEndian, &namespace); err != nil {
+		return nil, err
+	}
+
+	return &namespace, nil
 }