The assembler calls the exit with a request type of 1 (OPEN) at the start of the assembly.
The exit may set the return code in the Exit Parameter List to one of the following:
The exit can set the record length for the terminal data set by setting the reason code to 4 and the buffer length field. The buffer length field can be set to any value from 1 to 255 on z/OS and CMS, or from 1 to 125 on z/VSE. If the value is zero or greater than 255 on z/OS and CMS, or zero or greater than 125 on z/VSE, the assembler issues message ASMA404W and does not call the exit for any further processing.
If you provide a character string in the str6 suboption of the EXIT assembler option, the buffer pointer field points to the character string, and the buffer length contains the length of the character string. The buffer length is set to zero if there is no character string.
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