Channel exit programs

 

Channel exit programs are programs that are called at defined places in the processing sequence of an MCA. Users and vendors can write their own channel exit programs. Some are supplied by IBM.

There are several types of channel exit program, but only four have a role in providing link level security:

• Security exit

• Message exit

• Send exit

• Receive exit

These four types of channel exit program are illustrated in Figure 1 and are described in the following sections:

• Security exit

• Message exit

• Send and receive exits

Figure 1. Security, message, send, and receive exits on a message channel

• Security exit
  

• Message exit
  

• Send and receive exits
  

• Obtaining more information
  

 

Parent topic:

Other link level security services

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