【列表5.18】幫助函數(shù) ProcReadLink和調(diào)用他的函數(shù)。
// ProcReadLink - return the name of the file that the
// link points to.
function  ProcReadLink (pid: __pid_t; const sFile: String): String;
var
   buf : array [0..1024] of char;
   iLen : Integer;
   sFilename : String;
begin
   sFilename := Format ('/proc/%d/%s', [pid, sFile]);
   iLen := readlink (PChar(sFilename), buf, 1024);
   if iLen = -1 then
      iLen := 0;
   buf[iLen] := #0;
   Result := buf;
end;
// ProcGetCwd - return the process's current working directory.
function  ProcGetCwd (pid: __pid_t): String;
begin
   Result := ProcReadLink (pid, 'cwd');
end;
// ProcGetExe - return the name of the process's executable.
function  ProcGetExe (pid: __pid_t): String;
begin
   Result := ProcReadLink (pid, 'exe');
end;
// ProcGetRoot - return the process's root directory
function  ProcGetRoot (pid: __pid_t): String;
begin
   Result := ProcReadLink (pid, 'root');
end;