fsOpenFiles() added open file descriptor count

lib/filesystem.js

@@ -76,7 +76,7 @@ function fsSize(callback) {
       }
       if (_windows) {
         try {
-          util.wmic('logicaldisk get Caption,FileSystem,FreeSpace,Size').then((stdout, error) => {
+          util.wmic('logicaldisk get Caption,FileSystem,FreeSpace,Size').then((stdout) => {
             let lines = stdout.split('\r\n').filter(line => line.trim() !== '').filter((line, idx) => idx > 0);
             lines.forEach(function (line) {
               if (line !== '') {
@@ -107,6 +107,66 @@ function fsSize(callback) {
 
 exports.fsSize = fsSize;
 
+// --------------------------
+// FS - open files count
+
+function fsOpenFiles(callback) {
+
+  return new Promise((resolve) => {
+    process.nextTick(() => {
+      const result = {
+        max: -1,
+        allocated: -1,
+        available: -1
+      };
+      if (_freebsd || _openbsd || _darwin) {
+        let cmd = 'sysctl -a | grep \'kern.*files\'';
+        exec(cmd, function (error, stdout) {
+          if (!error) {
+            let lines = stdout.toString().split('\n');
+            result.max = parseInt(util.getValue(lines, 'kern.maxfiles', ':'), 10);
+            result.allocated = parseInt(util.getValue(lines, 'kern.num_files', ':'), 10);
+          }
+          if (callback) {
+            callback(result);
+          }
+          resolve(result);
+        });
+      }
+      if (_linux) {
+        let cmd = 'cat /proc/sys/fs/file-nr';
+        exec(cmd, function (error, stdout) {
+          if (!error) {
+            let lines = stdout.toString().split('\n');
+            if (lines[0]) {
+              const parts = lines[0].replace(/\s+/g, ' ').split(' ');
+              if (parts.length === 3) {
+                result.allocated = parseInt(parts[0], 10);
+                result.available = parseInt(parts[1], 10);
+                result.max = parseInt(parts[2], 10);
+              }
+            }
+          }
+          if (callback) {
+            callback(result);
+          }
+          resolve(result);
+        });
+      }
+      if (_sunos) {
+        if (callback) { callback(result); }
+        resolve(result);
+      }
+      if (_windows) {
+        if (callback) { callback(result); }
+        resolve(result);
+      }
+    });
+  });
+}
+
+exports.fsOpenFiles = fsOpenFiles;
+
 // --------------------------
 // disks
 
@@ -638,9 +698,9 @@ function diskLayout(callback) {
     model = model.toUpperCase();
     diskManufacturers.forEach((manufacturer) => {
       const re = RegExp(manufacturer.pattern);
-      if (re.test(model)) { result = manufacturer.manufacturer }
-    })
-    return result
+      if (re.test(model)) { result = manufacturer.manufacturer; }
+    });
+    return result;
   }
 
   return new Promise((resolve) => {
@@ -656,7 +716,7 @@ function diskLayout(callback) {
               const out = stdout.toString().trim();
               const outJSON = JSON.parse(out);
               if (outJSON && outJSON.hasOwnProperty('blockdevices')) {
-                let devices = outJSON.blockdevices.filter(item => { return item.group === 'disk' && item.size > 0 && item.model !== null });
+                let devices = outJSON.blockdevices.filter(item => { return item.group === 'disk' && item.size > 0 && item.model !== null; });
                 devices.forEach((device) => {
                   let mediumType = '';
                   const BSDName = '/dev/' + device.name;

lib/index.d.ts

@@ -250,6 +250,12 @@ export namespace Systeminformation {
     mount: string;
   }
 
+  interface FsOpenFilesData {
+    max: number;
+    allocated: number;
+    available: number;
+  }
+
   interface BlockDevicesData {
     name: string;
     identifier: string;
@@ -511,6 +517,7 @@ export function battery(cb?: (data: Systeminformation.BatteryData) => any): Prom
 export function graphics(cb?: (data: Systeminformation.GraphicsData) => any): Promise<Systeminformation.GraphicsData>;
 
 export function fsSize(cb?: (data: Systeminformation.FsSizeData[]) => any): Promise<Systeminformation.FsSizeData[]>;
+export function fsOpenFiles(cb?: (data: Systeminformation.FsOpenFilesData[]) => any): Promise<Systeminformation.FsOpenFilesData[]>;
 export function blockDevices(cb?: (data: Systeminformation.BlockDevicesData[]) => any): Promise<Systeminformation.BlockDevicesData[]>;
 export function fsStats(cb?: (data: Systeminformation.FsStatsData) => any): Promise<Systeminformation.FsStatsData>;
 export function disksIO(cb?: (data: Systeminformation.DisksIoData) => any): Promise<Systeminformation.DisksIoData>;

lib/index.js

@@ -337,6 +337,7 @@ exports.battery = battery;
 exports.graphics = graphics.graphics;
 
 exports.fsSize = filesystem.fsSize;
+exports.fsOpenFiles = filesystem.fsOpenFiles;
 exports.blockDevices = filesystem.blockDevices;
 exports.fsStats = filesystem.fsStats;
 exports.disksIO = filesystem.disksIO;