Setjmp

Save current execution point.

Declaration

Source position: setjumph.inc line 26

  function Setjmp(var S: jmp_buf) : LongInt;

Description

SetJmp fills env with the necessary data for a jump back to the point where it was called. It returns zero if called in this way. If the function returns nonzero, then it means that a call to LongJmp with env as an argument was made somewhere in the program.

Errors

None.

See also

Name	Description
LongJmp	Jump to address.

Example

program example79;
{ Program to demonstrate the setjmp, longjmp functions }
procedure dojmp(var env : jmp_buf; value : longint);
begin
  value:=2;
  Writeln ('Going to jump !');
  { This will return to the setjmp call,
    and return value instead of 0 }
  longjmp(env,value);
end;
var env : jmp_buf;
begin
  if setjmp(env)=0 then
    begin
    writeln ('Passed first time.');
    dojmp(env,2);
    end
  else
    writeln ('Passed second time.');
end.