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1. Sockets

Product Information

Environment Specification

Temporary Waivers

None

1.1 Supported Features

1.1.1 Socket Domains

Question 1: Which socket domains are supported by the implementation?

Response

Domain	Type	Protocol

Rationale

The CAE Specification, Networking Services, Issue 4, defines that the domains, socket types and protocols supported by a conforming system are implementation-dependent. Component Definitions, Issue 2, states that products conforming to the Sockets Product Standard definition shall be available in configurations that support the following socket domains:

• AF_INET, with at least SOCK_STREAM and SOCK_DGRAM socket types
• AF_UNIX, with at least the SOCK_STREAM socket type.

Reference

CAE Specification, Networking Services, Issue 4, Chapter 8, Sockets Interfaces, socket().

Sockets Product Standard Definition.

1.2 Limits

1.2.1 Listen Queues

Question 2: What is the limit the implementation places on the length of a socket's listen queue?

Response

Rationale

The specification states that an implementation may limit the length of a socket's listen queue, and that this limit may be imposed if the setting of the backlog argument exceeds an implementation-dependent maximum value.

Reference

CAE Specification, Networking Services, Issue 4, Chapter 8, Sockets Interfaces, listen().

1.3 Reference Manual Pages

1.3.1 Error Numbers

Question 3: Which of the following optional errors listed in the Reference Manual Pages are detected in the circumstances specified?

Response

Function	Error	Detected
accept()	ENOMEM	Yes   No
	ENOBUFS	Yes   No
	ENOSR	Yes   No
	EPROTO	Yes   No
bind()	EINVAL	Yes   No
	EISCONN	Yes   No
	ENAMETOOLONG	Yes   No
	ENOBUFS	Yes   No
	ENOSR	Yes   No
connect()	EADDRINUSE	Yes   No
	ECONNRESET	Yes   No
	EHOSTUNREACH	Yes   No
	EINVAL	Yes   No
	ENAMETOOLONG	Yes   No
	ENETDOWN	Yes   No
	ENOBUFS	Yes   No
	ENOSR	Yes   No
	EOPNOTSUPP	Yes   No
fgetpos()	ESPIPE	Yes   No
fsetpos()	ESPIPE	Yes   No
ftell()	ESPIPE	Yes   No
getpeername()	ENOBUFS	Yes   No
	ENOSR	Yes   No
getsockname()	EINVAL	Yes   No
	ENOBUFS	Yes   No
	ENOSR	Yes   No
getsockopt()	EINVAL	Yes   No
	ENOBUFS	Yes   No
	ENOSR	Yes   No
listen()	EINVAL	Yes   No
	ENOBUFS	Yes   No
recv()	EIO	Yes   No
	ENOBUFS	Yes   No
	ENOMEM	Yes   No
	ENOSR	Yes   No
recvfrom()	EIO	Yes   No
	ENOBUFS	Yes   No
	ENOMEM	Yes   No
	ENOSR	Yes   No
recvmsg()	EINVAL	Yes   No
	EIO	Yes   No
	ENOBUFS	Yes   No
	ENOMEM	Yes   No
	ENOSR	Yes   No
send()	ENETDOWN	Yes   No
	EHOSTUNREACH	Yes   No
	ENOBUFS	Yes   No
	ENOSR	Yes   No
	EIO	Yes   No
sendmsg()	EDESTADDRREQ	Yes   No
	EHOSTUNREACH	Yes   No
	EINVAL	Yes   No
	EIO	Yes   No
	EISCONN	Yes   No
	ENAMETOOLONG	Yes   No
	ENETDOWN	Yes   No
	ENETUNREACH	Yes   No
	ENOBUFS	Yes   No
	ENOMEM	Yes   No
	ENOSR	Yes   No
sendto()	EDESTADDRREQ	Yes   No
	EHOSTUNREACH	Yes   No
	EINVAL	Yes   No
	EIO	Yes   No
	EISCONN	Yes   No
	ENAMETOOLONG	Yes   No
	ENETDOWN	Yes   No
	ENETUNREACH	Yes   No
	ENOBUFS	Yes   No
	ENOMEM	Yes   No
	ENOSR	Yes   No
setsockopt()	ENOMEM	Yes   No
	ENOBUFS	Yes   No
	ENOSR	Yes   No
shutdown()	ENOBUFS	Yes   No
	ENOSR	Yes   No
socket()	ENOBUFS	Yes   No
	EMNOMEM	Yes   No
	ENOSR	Yes   No
socketpair()	EACCES	Yes   No
	ENOMEM	Yes   No
	ENOBUFS	Yes   No
	ENOSR	Yes   No

Rationale

Each of the above error conditions is marked as optional in the Reference Manual Pages and an implementation may return this error in the circumstances specified or may not provide the error indication.

Reference

CAE Specification, Networking Services, Issue 4, Chapter 8, Sockets Interfaces, ERRORS.

2. Appendix

Hardware environment:
	•The z15/8561 configured with 88 CPs, 2 IFLs and 8 zIIPs. Model 788.
	•62 LPAR images are defined with an additional 5 CFs.
	•With the exception of a performance oriented LPAR and a CF, all processors are shared.
	•z15 Total Installed Storage : 5120 GB
	•z15 Hardware System Area : 256 GB
	•z15 Customer Storage : 4864 GB
	•Mode : General
	•J16 : 16GB Central Storage with 4 shared CPs
	•J17 : 16GB Central Storage with 4 shared CPs
	•Shared OSA connection on each LPAR image to Eastern Region LAN for console access
	•Shared OSA connection on each LPAR image to Eastern Region LAN for system access
	•Storage Units used :  
DS8880-2831 - Two logical control units with 200 volumes (3390)
Shared Pool DASD (P1 Pool) : DS8900 (5331-996)
Shared Pool DASD (P2 Pool) : DS8870 (2421-961)

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3. Change History

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