Parameter values returned to the application

ERRNO

A fullword binary field. If RETCODE is negative, the field contains an error number. See Socket call error return codes for information about ERRNO return codes.

RETCODE

A fullword binary field that returns one of the following values:

If COMMAND was set to 3 (query), a bit string is returned.
- If RETCODE contains X'00000004', the socket is nonblocking. (The FNDELAY flag is on.)
- If RETCODE contains X'00000000', the socket is blocking. (The FNDELAY flag is off.)
If COMMAND was set to 4 (set), a successful call is indicated by 0 in this field. In both cases, a RETCODE of -1 indicates an error (check the ERRNO field for the error number).