I believe that you have to examine UCBDVCLS and UCBUNTYP (UCBTBYT3 and UCBTBYT4), and I vaguely recall that there is a mapping macro for them.
-- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Discussion List <[email protected]> on behalf of Mark Jacobs <[email protected]> Sent: Wednesday, September 23, 2020 3:56 PM To: [email protected] Subject: IEFDDSRV — DD service I'm reading the documentation and it's telling me this; In some cases, this service may not return a device UCB, but instead may return a zero UCB address or the address of a dummy UCB. This may occur for DDs that represent DD DUMMY requests, VIO data sets, SYSOUT data sets, in-stream data sets, and some SMS-managed data sets. A dummy UCB can be identified using the UCBDUMMY field in the UCB. A dummy UCB may not have all of the UCB segments that a device UCB may have and not all services that are used for processing device UCBs may support dummy UCBs. I don't see a UCBDUMMY field in mapping macro IEFUCBOB. Mark Jacobs Sent from [ProtonMail](https://secure-web.cisco.com/13bZRcYOz66_uaoS9FrZGIDFa-lw0uQqEHZFvXAxEX8Waw-gWYNQgc0Ix8uisZot60C5ZjO6NsMwhbe0HIEStAT0BOYaC2nubwbmFdALTO4pTGm0UT13vnFmxqNGhtf78KmOVI7gkTEa0WECEMkFMAZAIBssr7zeVB8lpsFuaIDhWkNTeQiR1xnDtGgpFC6W7i7HWXTk4LiZRpf3WSZu5IM0JEB5vU0dgRPLGCJxCNpFBl8XH4zS20mGgC-FEk8YeIKFOcoSaOXkUtX5pL-7pDnOmIf5I2nf56gCRjL8Fbrhzp4WfBS8p0fb_ofJ4rMAPc3BgTbBRTDUdX1H77ED7N7XuCo6MNIUoK4Q25xQPdmOrQ7OLcfP39YXTBGNjblwJ8N_QkQ0s0611j3oaCHt8M2qsvmz54RXeVjAyYp38tEg9_mbFYdx1F4u79UjgWDPh/https%3A%2F%2Fprotonmail.com), Swiss-based encrypted email. GPG Public Key - https://secure-web.cisco.com/1LWMSSaDWUlpY9gIzqXBpqUeduXaHVw7wSL1fxkzoPEp6ost7Tz4HLtoTrkq3WsGNB69Ba-cB7JZRryVy6EFfT2xx5gvcQfgJmfYlq5LEDbCSTyTliEHg0EFLcax8x4fF6dO22S_p5J2J-n1d-Hi-NR6nKSGOhyBN4h1R2f3spletxjRUzvmhnlnuiN5ubY5v7enJ4NsYPYNHZcZOkebLtvKTIXXJ8ucI5HEvvx_9vh-KHbanQtCgORB2QQDYAFH9LUuWgRYQZQo1CrhK10uAybzFwUICusdQsBkSBdgTk-FwRV4TiIpGVFyBloU_U5WDsnRixnWTI9auZ0Pbwy0Pm1XyJNyXuTEJ4GsH_phBOEXUFTppYUf0J1nA6WP2kqy5U7vzWTrbw5adToJjmRKK7qb8e_a-ElI1i2qFt8a0qV2026r2FftMz6bYFmnM6h32/https%3A%2F%2Fapi.protonmail.ch%2Fpks%2Flookup%3Fop%3Dget%26search%3Dmarkjacobs%40protonmail.com ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
