diff --git a/kernel_darwin.go b/kernel_darwin.go
index b586896..3c003dd 100644
--- a/kernel_darwin.go
+++ b/kernel_darwin.go
@@ -1,5 +1,3 @@
-//+build darwin
-
 package sysinfo
 
 // Kernel information.
diff --git a/kernel_freebsd.go b/kernel_freebsd.go
new file mode 100644
index 0000000..3c003dd
--- /dev/null
+++ b/kernel_freebsd.go
@@ -0,0 +1,11 @@
+package sysinfo
+
+// Kernel information.
+type Kernel struct {
+	Release      string `json:"release,omitempty"`
+	Version      string `json:"version,omitempty"`
+	Architecture string `json:"architecture,omitempty"`
+}
+
+func (si *SysInfo) getKernelInfo() {
+}
diff --git a/kernel_linux.go b/kernel_linux.go
index 64e1b6c..b024215 100644
--- a/kernel_linux.go
+++ b/kernel_linux.go
@@ -2,8 +2,6 @@
 //
 // Use of this source code is governed by an MIT-style license that can be found in the LICENSE file.
 
-//+build linux
-
 package sysinfo
 
 import (
diff --git a/kernel_windows.go b/kernel_windows.go
new file mode 100644
index 0000000..3c003dd
--- /dev/null
+++ b/kernel_windows.go
@@ -0,0 +1,11 @@
+package sysinfo
+
+// Kernel information.
+type Kernel struct {
+	Release      string `json:"release,omitempty"`
+	Version      string `json:"version,omitempty"`
+	Architecture string `json:"architecture,omitempty"`
+}
+
+func (si *SysInfo) getKernelInfo() {
+}
diff --git a/network_darwin.go b/network_darwin.go
new file mode 100644
index 0000000..ecf210a
--- /dev/null
+++ b/network_darwin.go
@@ -0,0 +1,13 @@
+package sysinfo
+
+// NetworkDevice information.
+type NetworkDevice struct {
+	Name       string `json:"name,omitempty"`
+	Driver     string `json:"driver,omitempty"`
+	MACAddress string `json:"macaddress,omitempty"`
+	Port       string `json:"port,omitempty"`
+	Speed      uint   `json:"speed,omitempty"` // device max supported speed in Mbps
+}
+
+func (si *SysInfo) getNetworkInfo() {
+}
diff --git a/network_freebsd.go b/network_freebsd.go
new file mode 100644
index 0000000..ecf210a
--- /dev/null
+++ b/network_freebsd.go
@@ -0,0 +1,13 @@
+package sysinfo
+
+// NetworkDevice information.
+type NetworkDevice struct {
+	Name       string `json:"name,omitempty"`
+	Driver     string `json:"driver,omitempty"`
+	MACAddress string `json:"macaddress,omitempty"`
+	Port       string `json:"port,omitempty"`
+	Speed      uint   `json:"speed,omitempty"` // device max supported speed in Mbps
+}
+
+func (si *SysInfo) getNetworkInfo() {
+}
diff --git a/network.go b/network_linux.go
similarity index 100%
rename from network.go
rename to network_linux.go
diff --git a/network_windows.go b/network_windows.go
new file mode 100644
index 0000000..ecf210a
--- /dev/null
+++ b/network_windows.go
@@ -0,0 +1,13 @@
+package sysinfo
+
+// NetworkDevice information.
+type NetworkDevice struct {
+	Name       string `json:"name,omitempty"`
+	Driver     string `json:"driver,omitempty"`
+	MACAddress string `json:"macaddress,omitempty"`
+	Port       string `json:"port,omitempty"`
+	Speed      uint   `json:"speed,omitempty"` // device max supported speed in Mbps
+}
+
+func (si *SysInfo) getNetworkInfo() {
+}
diff --git a/node.go b/node.go
index 480ac0d..a59c8e8 100644
--- a/node.go
+++ b/node.go
@@ -40,21 +40,21 @@ func (si *SysInfo) getSetMachineID() {
 		}
 
 		// They both exist, but they don't match! Copy systemd machine id to DBUS machine id.
-		spewFile(pathDbusMachineID, systemdMachineID, 0444)
+		spewFile(pathDbusMachineID, systemdMachineID, 0o444)
 		si.Node.MachineID = systemdMachineID
 		return
 	}
 
 	// Copy DBUS machine id to non-existent systemd machine id.
 	if systemdMachineID == "" && dbusMachineID != "" {
-		spewFile(pathSystemdMachineID, dbusMachineID, 0444)
+		spewFile(pathSystemdMachineID, dbusMachineID, 0o444)
 		si.Node.MachineID = dbusMachineID
 		return
 	}
 
 	// Copy systemd machine id to non-existent DBUS machine id.
 	if systemdMachineID != "" && dbusMachineID == "" {
-		spewFile(pathDbusMachineID, systemdMachineID, 0444)
+		spewFile(pathDbusMachineID, systemdMachineID, 0o444)
 		si.Node.MachineID = systemdMachineID
 		return
 	}
@@ -68,8 +68,8 @@ func (si *SysInfo) getSetMachineID() {
 	}
 	newMachineID := fmt.Sprintf("%x%x", random, time.Now().Unix())
 
-	spewFile(pathSystemdMachineID, newMachineID, 0444)
-	spewFile(pathDbusMachineID, newMachineID, 0444)
+	spewFile(pathSystemdMachineID, newMachineID, 0o444)
+	spewFile(pathDbusMachineID, newMachineID, 0o444)
 	si.Node.MachineID = newMachineID
 }
 
diff --git a/sysinfo.go b/sysinfo.go
index 30b851d..f56ebb9 100644
--- a/sysinfo.go
+++ b/sysinfo.go
@@ -5,6 +5,8 @@
 // Package sysinfo is a Go library providing Linux OS / kernel / hardware system information.
 package sysinfo
 
+import "runtime"
+
 // SysInfo struct encapsulates all other information structs.
 type SysInfo struct {
 	Meta    Meta            `json:"sysinfo"`
@@ -23,6 +25,10 @@ type SysInfo struct {
 
 // GetSysInfo gathers all available system information.
 func (si *SysInfo) GetSysInfo() {
+	if runtime.GOOS != "linux" {
+		return
+	}
+
 	// Meta info
 	si.getMetaInfo()
 
diff --git a/util.go b/util.go
index cd499a4..3a9ad8b 100644
--- a/util.go
+++ b/util.go
@@ -21,6 +21,6 @@ func slurpFile(path string) string {
 }
 
 // Write one-liner text files, add newline, ignore errors (best effort).
-func spewFile(path string, data string, perm os.FileMode) {
+func spewFile(path, data string, perm os.FileMode) {
 	_ = ioutil.WriteFile(path, []byte(data+"\n"), perm)
 }