列表5.9.txt

klinux书籍的配套光盘。可以学习学习。

【列表5.9】ProcStuff单元代码。
unit ProcStuff;
interface
uses SysUtils, Classes, Libc;
const
  NO_ERR   =  0;
  NOT_FOUND = -1;
  PIPE ERR  = -2;
  MISC ERR  = -3;
 type
  PProcInfoRec = ^TProcInfoRec;
  TProcInfoRec =
    record
      PID : Integer; { process id }
      Status : String; { process status }
      uName : String; { name of process initiator }
      CmdName : String; [ name of process (no path) }
    end; { record }
 {
       - For a given process ID, return the process
        status, the login of the user who invoked the
        process, and the command line used to -invoke it.
         Return value indicates success.
}
function GetProcessStatus(    PID : Integer;
                           var Status : String;
                           var UName  : String;
                           var Cmd    : String) : Integer:
{
  - For a given process name. return a pointer
    to a list of records that contain the process
    ID, -its status and the name of the user who
    Initiated the process. If no matches were
    found, return nil.
}
function GetProcessListByName(Cmd : String)
  : TList;
impiementation
function ParseToSpace(var  InStr : String) : String;
var
 OutStr : String;
begin
 OutStr :=’ ‘;
 while (Length(lnstr) > 0) and (InStr[1] = ' ') do
   Delete(Instr, 1, 1):
  while (Length(lnstr) > 0) and (lnStr[1] <> ' ‘) do
   begin
    OutStr := OutStr + InStr[1];
    Deiete(InStr,1,1);
 end; { while }
  Result := OutStr;
 end; { ParseToSpace }
 function GetProcessStatus(    PID : Integer;
                            var Status : String;
                            var UNarne  : String;
                            var Cmd    : String) : Integer;
 const
  PIPE_CMD : PChar = 'ps -eo pid.stat,user,args | grep ';
  PIPE_TYPE : PChar = 'r'; {read from the pipe }
 var
  CmdArr : array[0. .512] of char;
  StrArr : array[0..1024] of char;
  F : PIOFile;
  s : String;
  ErrResult : Integer;
  PtrResuH : Pointer:
  Found : Boolean;
 PSLine : String;
begin
 ErrResult := NO_ERR;
 StrPCopy(CmdArr, PIPE_CMD);
 StrPCopy(StrArr, lntToStr(PID));
 StrCat(CmdArr, StrArr);
 F := popen(CmdArr, PIPE_TYPE):
 If F = nil
  then ErrResult := PIPE_ERR
  else begin
         Found := False;
         repeat
          PtrResult :=fgets(StrArr, 1024. F);
          if PtrResult <> nil
           then begin
                 PSLine := StrPas(StrArr);
                 PSLine := Copy(PSLine, 1. Length(PSLine) - 1)
                 s := ParseToSpace(PSLine):
                 Found := StrToInt(s) =PID:
                 if Found
                  then begin
                        { Parse out the values }
                        Status   := ParseToSpace(PSLine);
                        UName  := ParseToSpace(PSLine);
                        Cmd     := ParseToSpace(PSL1ne);
                       end;
                end;
         until Found or (PtrResult = nil);
         if (PtrResuU = nil) and (ErrResuH = NO_ERR)
          then ErrResult := NOT_FOUND;
         if (pclose(F) = -1) and (ErrResult = NO_ERR)
          then ErrResult := PIPE_ERR;
         end:
  Result := ErrResult;
 end;
 function GetProcessListByName(Cmd : String)
   : TList;
 const
  PIPE_CMD : PChar= 'ps -eo pid.stat,user,args| grep ';
  PIPE_TYPE : PChar ='r'; { read from the pipe }
 var
  CmdArr : array[0. .512] of char;
  StrArr : array[0..1024] of char;
  F : PIOFile;
PtrResult : Pointer;
AList : TList;
 Found : Boolean;
 PSLine : String;
 ProcRec : PProcInfoRec;
 PID : Integer;
 Status : String;
 UName : String;
 CmdName : String;
begin
 AList := TList.Create;
 StrPCopy(CmdArr, PIPE_CMD);
 StrPCopy(StrArr, Cmd);
 StrCat(CmdArr, StrArr);
  F := popen(CmdArr, PIPE_TYPE);
  if  F = nil
   then begin
            Result := nil;
            AList. Free;
             Exit;
           end;
  repeat
    PtrResult := fgets(StrArr, 1024, F);
    if PtrResult <> nil
     then begin
               PSLine := StrPas(StrArr);
               PSLine := Copy(PSLine, 1, Length(PSLine) - 1);
               PID := StrToInt(ParseToSpace(PSLine));
               Status := ParseToSpace(PSLine);
               UName := ParseToSpace(PSLine);
               CmdName := ParseToSpace(PSLine);
               CmdName := ExtractFileName(CmdName);
               Found := CmdName = Cmd;
               if Found
                 then begin
                          ProcRec := New(PProcInfoRec);
                          ProcRec. PID := PID;
                          ProcRec. Status := Status;
                          ProcRec.UName := UName;
                          ProcRec. CmdName := CmdName;
                          AList.Add(ProcRec);
                         end:
              end;
     until PtrResult= nil;
pclose(F);
 Result := AList;
end;
end.