ADIC Server - Manual (Page 192)

5-20 DAS ACI 3.0 Asynchronous Support Layer
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Return Values
The d_errno and d_text globals are copied to the d_errno and
d_text fields of the shared memory array entry. The process is
terminated by the exit call with the res exit code. If there are
problems with the shared memory attachment, the d_errno
global will be set to ENOSHARED.