User login request routine of the login exit

This routine is called when the mvslogin command or PCNFSD request or RPCSEC_GSS user session request is used. The installation security system should be called to determine if the user is properly authorized. Table 1 shows the codes and fields:

Table 1. Codes and fields for user login request
When Invoked	Field Name	Description	Contents
On entry	LEDSRQ	Request code	16
On entry	LEDSM	Client machine name	Character string
On entry	LEDSIA	Client IP address	Number
On entry	LEDSU	UNIX Client User ID number	Number
On entry	LEDSG	UNIX Client Group ID number	Number
On entry	LEDSMU	z/OS User ID	Character string
On entry	LEDSMG	z/OS Group Name	Character string
On entry	LEDSXS	User Exit Block	Address or 0
On entry	LEDSXG	Global Exit Block	Address
On entry	LEDSIA6	Client IP address	Number (128-bit Internet address, for Internet Protocol V6 users)
On exit	LEDSXD	Exit-supplied error message	Message Structure
On exit	LEDSRC	Return code	0 Login successful 4 Login failed
On exit	LEDSXS	User Exit Block	Value