z/OS UNIX System Services File System Interface Reference
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Specific processing notes

z/OS UNIX System Services File System Interface Reference
SA23-2285-00

The following UIO fields are provided by the LFS:
UIO.u_hdr.cbid
Contains UIO_ID (from the BPXYVFSI header file).
UIO.u_hdr.cblen
Specifies the length of the UIO.
UIO.u_buffadr
Specifies the address of the user's buffer.
UIO.u_count
Specifies the size of the user's buffer.If this value is 0, no read is done, and vn_anr is functionally equivalent to vn_accept. In this case, the rest of the UIO fields should be ignored.
UIO.u_asid
Specifies the ASID of the user.
UIO.u_rw
Set to 0, specifying a read request.
UIO.u_key
Specifies the storage key of the caller.

The Remote_sockaddr, Local_sockaddr, and data buffer are all optional.

Parent topic: vn_anr — Accept a socket connection and read the first block of data

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