1 files changed, 123 insertions, 0 deletions
diff --git a/systemunit.pas b/systemunit.pas
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index 0000000..645f09e
--- /dev/null
+++ b/systemunit.pas
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+unit systemunit;
+
+{$mode objfpc}{$H+}
+
+interface
+
+uses
+  Classes, SysUtils, Math;
+
+function cpuUtilization: extended;
+function numCpus: int64;
+function momentanFreieCpus: int64;
+function belegterSpeicher: int64;
+function minCache: int64;
+
+implementation
+
+var _cpuLastUsed,_cpuLastIdle: int64;
+
+function cpuUtilization: extended;
+var
+  procstat:  textfile;
+  s:         string;
+  used,idle: int64;
+  i:         integer;
+begin
+  result:=0;
+  s:='';
+  assignfile(procstat,'/proc/stat');
+  reset(procstat);
+  while not eof(procstat) do begin
+    readln(procstat,s);
+    if pos('cpu ',s)=1 then break;
+  end;
+  closefile(procstat);
+  if pos('cpu ',s)<>1 then exit;
+  delete(s,1,pos(' ',s));
+  s:=trim(s);
+  used:=0;
+  idle:=0;
+  for i:=0 to 3 do begin
+    used:=used+idle;
+    idle:=strtoint(copy(s,1,pos(' ',s)-1));
+    delete(s,1,pos(' ',s));
+    s:=trim(s);
+  end;
+  result:=(used-_cpuLastUsed)/max(1,used-_cpuLastUsed + idle-_cpuLastIdle);
+  _cpuLastUsed:=used;
+  _cpuLastIdle:=idle;
+end;
+
+function numCpus: int64;
+var
+  procstat:  textfile;
+  s:         string;
+begin
+  result:=0;
+  s:='';
+  assignfile(procstat,'/proc/stat');
+  reset(procstat);
+  while not eof(procstat) do begin
+    readln(procstat,s);
+    if (pos('cpu',s)=1) and
+       (pos('cpu ',s)<>1) then
+      inc(result);
+  end;
+  closefile(procstat);
+end;
+
+function momentanFreieCpus: int64;
+begin
+  result:=floor(numCpus*(1-cpuUtilization));
+end;
+
+function belegterSpeicher: int64;
+var f:    textFile;
+    s:    string;
+begin
+ s:='/proc/'+inttostr(getProcessId)+'/smaps';
+ result:=0;
+ if not fileexists(s) then exit;
+ assignfile(f,s);
+ reset(f);
+ while not eof(f) do begin
+   readln(f,s);
+   if (leftStr(s,4)='Rss:') and (rightStr(s,3)=' kB') then begin
+     delete(s,1,4);
+     delete(s,length(s)-2,3);
+     s:=trim(s);
+     result:=result+strtoint(s);
+   end;
+ end;
+ closefile(f);
+end;
+
+function minCache: int64;
+var f:    textFile;
+    s:    string;
+begin
+ s:='/proc/cpuinfo';
+ result:=0;
+ if not fileexists(s) then exit;
+ assignfile(f,s);
+ reset(f);
+ while not eof(f) do begin
+   readln(f,s);
+   if (leftStr(s,10)='cache size') and (rightStr(s,3)=' kB') then begin
+     delete(s,1,pos(':',s));
+     delete(s,length(s)-2,3);
+     s:=trim(s);
+     if result=0 then result:=strtoint(s)
+     else result:=min(result,strtoint(s));
+   end;
+ end;
+ closefile(f);
+end;
+
+begin
+  _cpuLastUsed:=0;
+  _cpuLastIdle:=0;
+  cpuUtilization;
+end.
+