Request codes to the login exit

Table 1 shows the login installation-wide exit request codes and their meanings:

Table 1. Request codes to the login exit
Code	Meaning
4 (X'04')	System initialization
8 (X'08')	System termination
12 (X'0C')	Start of new user session
16 (X'10')	User login request
20 (X'14')	User logout request

IBM might add new request codes in a future level of the server. To provide for this, consider making your exit set a return code 0 if it does not recognize the request code.