add uptime()

Author: scivision

+stdlib/+dotnet/uptime.m

@@ -0,0 +1,14 @@
+%% DOTNET.UPTIME get system uptime
+
+function t = uptime()
+
+try
+  tms = System.Environment.TickCount64;
+  ts = System.TimeSpan.FromMilliseconds(tms);
+  t = ts.TotalSeconds;
+catch e
+  dotnetException(e)
+  t = [];
+end
+
+end

+stdlib/+python/uptime.m

@@ -0,0 +1,10 @@
+function t = uptime()
+
+try
+  t0 = py.psutil.boot_time();
+  t = py.time.time() - t0;
+catch
+  t = [];
+end
+
+end

+stdlib/+sys/uptime.m

@@ -0,0 +1,23 @@
+%% SYS.UPTIME
+
+function t = uptime()
+
+t = [];
+
+if ispc()
+  [s, m] = system('pwsh -c "(Get-Uptime).TotalSeconds"');
+elseif ismac()
+  [s, m] = system('sysctl -n kern.boottime | awk ''{print $4}'' | sed ''s/,//g''');
+else
+  [s, m] = system('cat /proc/uptime | awk ''{print $1}''');
+end
+
+if s == 0
+  t = str2double(m);
+end
+
+if ismac()
+  t = posixtime(datetime('now', 'TimeZone', 'UTC')) - t;
+end
+
+end

+stdlib/uptime.m

@@ -0,0 +1,35 @@
+%% UPTIME get system uptime in seconds
+%
+%%% Outputs
+% * t: system uptime
+% * b: backend used
+
+function [r, b] = uptime(backend)
+if nargin < 1
+  backend = {'dotnet', 'python', 'sys'};
+else
+  backend = cellstr(backend);
+end
+
+r = '';
+
+for i = 1:numel(backend)
+  b = backend{i};
+  switch b
+    case 'dotnet'
+      r = stdlib.dotnet.uptime();
+    case 'python'
+      if stdlib.matlabOlderThan('R2022a'), continue, end
+      r = stdlib.python.uptime();
+    case 'sys'
+      r = stdlib.sys.uptime();
+    otherwise
+      error('stdlib:hostname:ValueError', 'Unknown backend: %s', b)
+  end
+
+  if ~isempty(r)
+    return
+  end
+end
+
+end

test/TestTime.m

@@ -3,7 +3,8 @@
     TestTime < matlab.unittest.TestCase
 
 properties (TestParameter)
-B_set_modtime = {'java', 'python', 'sys'}
+B_jps = {'java', 'python', 'sys'}
+B_dps = {'dotnet', 'python', 'sys'}
 end
 
 
@@ -21,16 +22,16 @@ function test_get_modtime(tc)
 end
 
 
-function test_touch_modtime(tc, B_set_modtime)
+function test_touch_modtime(tc, B_jps)
 
 fn = 'touch.txt';
 
 tc.assertTrue(stdlib.touch(fn))
 t0 = stdlib.get_modtime(fn);
 
-ok = stdlib.set_modtime(fn, datetime('tomorrow'), B_set_modtime);
+ok = stdlib.set_modtime(fn, datetime('tomorrow'), B_jps);
 
-if ismember(B_set_modtime, stdlib.Backend().select('set_modtime'))
+if ismember(B_jps, stdlib.Backend().select('set_modtime'))
   tc.assertTrue(ok)
   t1 = stdlib.get_modtime(fn);
   tc.verifyGreaterThanOrEqual(t1, t0)
@@ -39,6 +40,18 @@ function test_touch_modtime(tc, B_set_modtime)
 end
 end
 
+
+function test_uptime(tc, B_dps)
+
+if ismember(B_dps, stdlib.Backend().select('uptime'))
+  t1 = stdlib.uptime(B_dps);
+  tc.verifyGreaterThanOrEqual(t1, 0);
+  tc.verifyClass(t1, 'double')
+else
+  t1 = stdlib.uptime(B_dps);
+  tc.verifyEmpty(t1)
+end
 end
 
 end
+end