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SetJmp

Declaration:
Function SetJmp (Var Env : 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 (530) with env as an argument was made somewhere in the program.

Errors:
None.
See also:
LongJmp (530)

Listing: refex/ex79.pp

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.

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