The SIOCSPARTNERINFO ioctl sets an indicator to retrieve the partner security credentials during connection setup and saves the information. You must issue the SIOCSPARTNERINFO ioctl first to allow an application to issue a SIOCGPARTNERINFO ioctl without suspending the application, or at least to minimize the time needed to retrieve the information.

Result in a common INET environment: In a common INET (CINET) environment, which enables multiple TCP/IP stacks to run in a single logical partition (LPAR), the SIOCSPARTNERINFO ioctl is sent to all active stacks.