Caché ObjectScript Reference - InterSystems Documentation

Setting $ZUTIL(69,4) overrides the default system-wide; it does not change the systemconfiguration setting. The configuration default cannot be changed using the System ManagementPortal.ParametersnA boolean switch that determines the system-wide default mode for the principal deviceassociated with jobbed processes. 0 = Use the null process (NL: or /dev/null) as the principaldevice. 1 = Use principal device of the parent process.NotesKeep the following points in mind when you use $ZUTIL(69,4,n):Windows SystemsThis function is a no-op. A call to $ZUTIL(69,4) returns 0. A call to $ZUTIL(69,4,1) doesnot issue an error message, but performs no operation and returns 0.UNIX Systems• You can use this function to maintain compatibility with prior releases. In UNIX versionsprior to 4.4.91-12, a child process retained the principal devices of its parent. If you haveenabled this compatibility mode and subsequently wish to disable it, issue $ZUTIL(69,4,0)to restore /dev/null as the default device for JOBbed process.• Reading from the null device returns the null string.OpenVMS/Alpha SystemsCaché opens the principal input and output devices with a timeout of 2 seconds.If you job a process that accesses its principal input device, and it cannot open that device,the process gets a error. Failing to open the principal output device does notgenerate a error; the error occurs only if the input device cannot be opened.Reading from the null device results in a error.OpenVMS/VAX Systems$ZUTIL(69,4)If you job a process that accesses its principal input device, and it cannot open that device,it hangs until it either opens the device or is killed by calling the RESJOB utility. Failing toopen the principal output device does not generate a error; the error occursonly if the input device cannot be opened.Caché ObjectScript Reference 641