[Overview][Constants][Types][Procedures and functions][Index] | Reference for unit 'BaseUnix' (#rtl)

# FpNanoSleep

Suspend process for a short time

## Declaration

Source position: bunxh.inc line 99

`function FpNanoSleep(`
`req: ptimespec;`
`rem: ptimespec`
`):cint;`

## Description

FpNanoSleep suspends the process till a time period as specified in req has passed. Then the function returns. If the call was interrupted (e.g. by some signal) then the function may return earlier, and rem will contain the remaining time till the end of the intended period. In this case the return value will be -1, and ErrNo will be set to EINTR

If the function returns without error, the return value is zero.

## Errors

If an error occurred or the call was interrupted, -1 is returned. Extended error information can be retrieved using fpGetErrno.

## See also

FpPause |  | Wait for a signal to arrive
FpAlarm |  | Schedule an alarm signal to be delivered

## Example

    program example72;

    { Program to demonstrate the NanoSleep function. }

    uses BaseUnix;

    Var
      Req,Rem : TimeSpec;
      Res : Longint;

    begin
      With Req do
        begin
        tv_sec:=10;
        tv_nsec:=100;
        end;
      Write('NanoSleep returned : ');
      Flush(Output);
      Res:=(fpNanoSleep(@Req,@rem));
      Writeln(res);
      If (res<>0) then
        With rem do
          begin
          Writeln('Remaining seconds     : ',tv_sec);
          Writeln('Remaining nanoseconds : ',tv_nsec);
          end;
    end.

Documentation generated on: May 14 2021