DIGITAL TCP/IP Services for OpenVMS
System Services and C Socket Programming

Consider the following when using IO$M_READATTN:

There is a one-to-one correspondence between the number of times you enable an Attention AST and the number of times the AST is delivered. For example, for each enabled AST, one AST is delivered. If you enable an Attention AST several times, several ASTs are delivered for one event when an event occurs.
If an out-of-band (OOB) Attention AST is enabled, the OOB AST is delivered, regardless of the following:
- A Read Attention AST enabled
- The UCX$C_OOBINLINE socket option
- A READ $QIO waiting for completion on the socket

If the UCX$C_OOBINLINE option is set, then a waiting READ $QIO is completed and the OOB character is returned in the data stream.

If both an OOB AST and a Read Attention AST are enabled, only the OOB AST is delivered when an OOB character is received.
If a Read Attention AST is enabled and the UCX$C_OOBINLINE socket option is set, a waiting READ $QIO completes and the OOB character is returned in the data stream.
If a Read Attention AST is enabled and the UCX$C_OOBINLINE socket option is not set (clear), the Read Attention AST is delivered when an OOB character is received, regardless of whether a READ $QIO is waiting for completion. In this case, the OOB character is not returned in the data stream. Therefore, if the OOB character is the only character received, the READ $QIO does not complete.

Condition Values Returned

SS$_ABORT Programming, INET management, or hardware error. The route entry already exists, so your attempt to add a route entry using the IO$_SETMODE function failed.

SS$_ACCVIO Programming error. You attempted to access an invalid memory location or buffer.

SS$_BADPARAM Programming error. The parameter you specified for a $QIO function was invalid for one of the following reasons:

You attempted to execute the IO$_SETMODE subfunctions without specifying a device socket. Instead, create a device socket by issuing a $QIO with the IO$_SETMODE function and the proper parameters.
You made an error specifying a socket option.

SS$_DEVACTIVE INET management error. You attempted to change the static INET parameters. If you need new parameters, shut down the internet, reset the static parameters, and issue the START COMMUNICATION command.

SS$_DEVINACT INET management error. The driver was not started. Issue a UCX START COMMUNICATION command before issuing $QIO functions.

SS$_DEVNOTMOUNT INET management error. You improperly executed the startup procedure. The driver was loaded, but the INET_ACP was not activated. Execute the INET startup procedure again.

SS$_DUPLNAM Programming error. You attempted to bind a port already in use so the operation to bind the socket to the address and port failed.

SS$_EXQUOTA Programming or INET management error. The quota for the valid number of sockets caused an error for one of the following reasons:

You attempted to exceed the maximum number of sockets by creating new socket with the IO$_SETMODE function. Increase the maximum number of allowable sockets (INET parameter) before creating more sockets.
You specified a number of sockets with the IO$_SETMODE function that exceeds the maximum number of sockets allowed. Increase the maximum number of sockets (INET parameter) or reduce the number of sockets that the listener socket can create (listen parameter).

SS$_FILALRACC Programming error. You attempted to bind the socket to an address that is already in use and the operation failed.

SS$_INSFMEM Programming or system management error. Your system does not have enough resources to allocate new socket.

SS$_ILLCNTRFUNC Programming error. Operation is not supported.

Invalid IO$_SETMODE (IOCTL) function was used for the interface. The interface does not have an IOCTL routine.
An attempt was made to perform an IO$_SETMODE (IOCTL) function that required a socket, but the device did not have one. Create a socket and issue the IOCTL function.

SS$_IVADDR Programming error. The specified INET address is not in the system, and an invalid port number or an invalid INET address combination was specified with an IO$_SETMODE function (a bind).

An attempt to bind the address failed because the INET address is not in the system, port zero and INET address zero are not allowed, or port zero is not allowed when using an IO$_ACCESS or IO$_WRITEVBLK function.
An attempt to make a permanent entry in the ARP table failed because of lack of space. Too many permanent entries.
An attempt was made to bind an IP socket (raw IP) when there are no interfaces defined in the system.
An attempt was made to bind an IP socket (raw IP) to a null INET address.

SS$_IVBUFLEN Programming error. The socket option buffer has an invalid size.

SS$_NOLICENSE Programming or system management error. UCX license not present.

SS$_NOOPER Programming or INET management error. An attempt was made to execute an I/O function that needs the OPER privilege.

SS$_NOPRIV Programming or INET management error. Not enough privileges for the attempted operation.

Broadcasting an IP datagram was denied because the process does not have a system UIC, SYSPRV, BYPASS, or OPER privileges.
An attempt was made to use a reserved port number lower than 1024.
An operation accesses only processes that have a system UIC, SYSPRV, or BYPASS privilege.
Raw IP protocol can be used only on privileged sockets. The process must have a SYSPRV or BYPASS privilege.

SS$_NOSUCHDEV Programming error or INET management error. An INET address is not in the ARP table. An attempt to show or delete an ARP table entry failed.

SS$_NOSUCHNODE Programming error or INET management error. An attempt to delete a route from the routing table failed because a route entry was not found.

SS$_PROTOCOL Programming error.

The protocol type specified at socket creation is not valid.
The protocol is not supported.
The protocol type specified is not found in the internal tables. It is an invalid type.
The address family is not supported:

The address family specified with an IO$_SETMODE function (IOCTL subfunction) is not supported. The address family should be the UCX$C_AF_INET or UCX$C_UNSPEC address family.
The address family of the remote INET address specified with an IO$_ACCESS or IO$_WRITEVBLK function is not supported (UDP/IP or TCP/IP). The address family should be the UCX$C_AF_INET address family.
The address family of the local INET address specified with an IO$_SETMODE (bind) function is not supported. The address family should be the UCX$C_AF_INET address family.
The address family of the INET address that is specified in a request to the routing module is not supported. The address family should be the UCX$C_AF_INET address family.

SS$_SHUT The network is being shut down.

IO$_SETMODE|IO$M_WRTATTN

The IO$_SETMODE|IO$M_WRTATTN function/modifier combination (IO$M_WRTATTN is Enable Write Attention AST (asynchronous system trap)) requests that an Attention AST be delivered to the requesting process when a data packet can be queued to the socket. For TCP sockets, this occurs when the TCP transmit queue is available.

ARGUMENTS

p1

UCX usage procedure entry mask

type call without stack unwinding

access by reference

mechanism 0

To enable the AST, the p1 argument is the address of the Write Attention AST routine. To disable the AST, p1 is set to 0.
p2

UCX usage user_arg

type longword (unsigned)

access read only

mechanism by value

AST parameter to be delivered to the AST routine.
p3

UCX usage acmode

type longword (unsigned)

access read only

mechanism by value

Access mode to deliver the AST.

DESCRIPTION

The Enable Write Attention AST function enables an Attention AST to be delivered to the requesting process only once. After the AST occurs, the function must explicitly re-enable AST delivery before the AST can occur again. The function is subject to AST quotas.
There is a one-to-one correspondence between the number of times you enable an Attention AST and the number of times the AST is delivered. For example, for each enable AST, one AST is delivered. If you enable an Attention AST several times, several ASTs are delivered for one event when the event occurs.
You can use the UCX command SHOW DEVICE_SOCKET to display information on the socket's characteristics, options, and state.

Condition Values Returned

SS$_ABORT Programming error, INET management error, or hardware error. The route you specified with the IO$_SETMODE function already exists. Therefore, the operation failed.

SS$_ACCVIO Programming error. You attempted to access an invalid memory location or buffer.

SS$_BADPARAM Programming error. The parameter you specified for the $QIO I/O function was invalid for one of the following reasons:

You attempted to execute the IO$_SETMODE functions without specifying a device socket. Instead, create a device socket by issuing a $QIO with the IO$_SETMODE function and the proper parameters.
You made an error when specifying a socket option.

SS$_DEVACTIVE INET management error. You attempted to change the static INET parameters. If you need new parameters, shut down the internet, reset the static parameters, and issue the START COMMUNICATION command.

SS$_DEVINACT INET management error. The driver is not started. Issue a UCX START COMMUNICATION command before issuing $QIO functions.

SS$_DEVNOTMOUNT INET management error. The INET startup procedure was improperly executed. The driver was loaded, but the INET_ACP was not activated. Execute the INET startup procedure again.

SS$_DUPLNAM Programming error. Port that is being bound is already in use. An attempt to bind the socket to an address and port failed.

SS$_EXQUOTA Programming or INET management error.

You attempted to create a new socket with the IO$_SETMODE function and it failed because the maximum number of sockets was exceeded. Increase the maximum number of sockets (INET parameter) and then create a new socket.
The number of sockets you specified with the IO$_SETMODE function exceeds the allowable maximum number of sockets. Increase the maximum number of sockets (INET parameter) or reduce the number of sockets that the listener socket can create (listen parameter).

SS$_FILALRACC Programming error. Because the INET address is already in use, your attempt to bind the socket to an address and port failed.

SS$_INSFMEM Programming or system management error. There are not enough resources to allocate new socket.

SS$_ILLCNTRFUNC Programming error. You specified an operation that is unsupported for one of the following reasons:

You used an invalid IO$_SETMODE function for the interface. The interface does not have an IOCTL routine.
You attempted to execute an IO$_SETMODE function that required a socket, but the device did not have one. Instead, create a socket and issue the function.

SS$_IVADDR Programming error. You specified an invalid port number and INET address combination with the IO$_SETMODE bind function. This caused the operation to fail for one of the following reasons:

You specified an illegal combination of port zero and INET address zero.
You specified port zero when using an IO$_ACCESS or IO$_WRITEVBLK function.
When you attempted to make a permanent entry in the ARP table, the operation failed because of lack of space. There are too many permanent entries.
You attempted to bind a raw IP socket when there were no interfaces defined in the system.
You attempted to bind a raw IP socket to a null INET address.

SS$_IVBUFLEN Programming error. You specified an invalid size for the socket option buffer.

SS$_NOLICENSE Programming or system management error. There is no DIGITAL TCP/IP Services for OpenVMS license present.

SS$_NOOPER Programming or INET management error. You attempted to execute an I/O function that needs the OPER privilege.

SS$_NOPRIV Programming or INET management error. You attempted to execute an operation that failed for one of the following reasons:

You cannot broadcast an IP datagram for a process if you do not have system UIC, SYSPRV, BYPASS, or OPER privileges.
You attempted to use a reserved port number lower than 1024.
You attempted to access a process when you do not have system UIC, SYSPRV, or BYPASS privileges.
You attempted to use raw IP on a socket that is not a privileged sockets. To do this, the process must have SYSPRV or BYPASS privilege.

SS$_NOSUCHDEV Programming error or INET management error. You attempted to show or delete an entry in the ARP table. However, because the INET address was not in the ARP table, the operation failed.

SS$_NOSUCHNODE Programming error or INET management error. You attempted to delete a route from the routing information table (RIT). However, because the route was not found in the RIT, the operation failed.

SS$_PROTOCOL Programming error.

You specified an invalid protocol type when you created the socket.
You specified an unsupported protocol.
You specified a protocol type that is invalid because it is not found in the internal tables.
You specified an address family that is not supported for one of the following reasons:

You specified an address family with an IO$_SETMODE subfunction. Instead, specify the UCX$C_AF_INET or UCX$C_UNSPEC address family.
You specified an address family of the remote INET address for a datagram or stream socket with an IO$_ACCESS or IO$_WRITEVBLK function. Instead, specify the UCX$C_AF_INET address family.
You specified an address family of the local INET address with an IO$_SETMODE bind function. Instead, specify the UCX$C_AF_INET address family.
You made a request to the routing module by specifying the address family of the INET address. Instead, specify the UCX$C_AF_INET address family.

SS$_SHUT The network is being shut down.

IO$_WRITEVBLK

Write I/O functions provide direct transfer of data from the virtual address space of the user's process to an internet host or port. The DIGITAL TCP/IP Services for OpenVMS product provides the WRITE I/O function code IO$_WRITEVBLK, which writes a user buffer for stream sockets, datagrams, or raw IP.
If you specify multiple buffers, the system sends data from buffers in the order specified by the p5 list. For UDP and raw IP, the TCP/IP software sends the data in one datagram. The data to be sent is buffered by TCP/IP before being transmitted to the remote host.
For a TCP socket, if the socket transmit queue is full, the Write I/O operation will be blocked until the transmit queue has enough room for the user data.
For UDP and raw IP sockets, if the user data is greater than the transmit (send) socket quota, an error code is returned (SS$_TOOMUCHDATA).
The equivalent C Socket functions are recv*, send*(), sendto() and write().
Programming examples for the IO$_WRITEVBLK routine follow this command description. Example 4-12 uses the MACRO-32 programming language and Example 4-13 uses the C programming language to read a vectored buffer. Example 4-14 uses the C programming language to read from an INET driver.

ARGUMENTS

p1

UCX usage buffer

type longword (unsigned)

access read only

mechanism by reference

The p1 argument specifies the starting virtual address of the buffer containing the data to be transmitted.
p2

UCX usage buffer length

type longword (unsigned)

access read only

mechanism by value

The p2 argument specifies the size (in bytes) of the buffer containing the data to be transmitted.
p3

UCX usage remote socket name (message source)

type longword (unsigned)

access read only

mechanism by descriptor

The p3 argument specifies the address of a UCX item_list_2 descriptor. This descriptor points to a buffer that contains the remote port and remote host internet address (socket name) of the message destination.
p4

UCX usage flags

type longword (unsigned)

access read only

mechanism by value

The p4 argument specifies the flags for the Write operation. Table 4-18 describes the valid flags for this argument.

Table 4-18 Valid Write Flags for the p4 Argument
Flag Description

UCX$C_MSG_OOB Writes an out-of-band (OOB) byte.

UCX$C_MSG_DONTROUTE Sends the message directly without routing.

UCX$C_MSG_NBIO Completes the I/O operation and returns an error if a condition that would cause the I/O operation to be blocked. Similar to using IO$M_NOWAIT.

p5

UCX usage UCX item_list_2

type longword (unsigned)

access read only

mechanism by descriptor

The p5 argument specifies the address for the descriptor of an input parameter list. The maximum number of buffers you can specify with the p5 argument is 16.
The p1 and p2 arguments and the p5 argument are mutually exclusive. You either use p1 and p2 or you use p5. The software first checks to see if the p1 argument is being used. If p1 is not used, it checks to see if the p5 argument is being used. If neither the p1 nor the p5 argument is being used, an error code is produced.
The resulting transfer-length value of the I/O status block is the sum of the bytes transferred in the multiple buffers.

**Table 4-18 Valid Write Flags for the p4 Argument**
Flag	Description
UCX$C_MSG_OOB	Writes an out-of-band (OOB) byte.
UCX$C_MSG_DONTROUTE	Sends the message directly without routing.
UCX$C_MSG_NBIO	Completes the I/O operation and returns an error if a condition that would cause the I/O operation to be blocked. Similar to using IO$M_NOWAIT.

Function Modifiers

IO$M_INTERRUPT Sends an out-of-band byte to a target process. At the remote process, the byte is delivered to the user through the data receive mechanism.

IO$M_NOWAIT Regardless of a $QIO or $QIOW, if the system detects a condition that would cause the I/O operation to be blocked, the system completes the I/O operation and returns the error code SS$_SUSPENDED.
When using this function modifier, always check the message length in the IOSB to ensure that all data is transferred. If only 1 byte of data is transferred, the function returns a success status even if data is not completely transferred.

Condition Values Returned

SS$_ABORT Programming error, INET management error, or hardware error. The execution of the I/O was aborted.

SS$_ACCVIO Programming error. An attempt was made to access an invalid memory location or buffer.

SS$_BADPARAM Programming error. A $QIO I/O function was specified using an invalid parameter.

An attempt was made to execute an IO$_WRITEVBLK function without specifying a device socket. First create a device socket by issuing an IO$_SETMODE function and the proper arguments.
An attempt was made to issue an IO$_READVBLK or IO$_WRITEVBLK function that does not specify a correct buffer address ( p1, p5, or p6 is null).
An attempt was made to issue an IO$_READVBLK or IO$_WRITEVBLK that specifies an invalid vectored buffer ( p5 or p6 specifies an invalid address descriptor).

SS$_CANCEL Warning code. The I/O operation was canceled by issuing a $CANCEL system service.

SS$_DEVINACT INET management error. The driver was not started. A UCX START COMMUNICATION command must be executed before issuing any $QIO function.

SS$_DEVNOTMOUNT INET management error. The INET startup procedure was executed improperly. The driver was loaded, but the INET_ACP was not activated.

SS$_EXQUOTA Returned when process resource mode wait is disabled. There is no internet request packet (IRP) available for completing the request. Increase the buffered I/O quota.

SS$_FILALRACC Programming error.

INET address is already in use. An attempt was made to bind the socket to an address but the port failed.
IP protocol (raw socket). An attempt was made to specify a remote INET socket address with an IO$_WRITEVBLK function, while an INET address was already specified with an IO$_ACCESS function.
UDP/IP protocol. An attempt was made to specify a remote INET socket address with an IO$_WRITEVBLK function, while an INET address was already specified with the IO$_ACCESS function.

SS$_ILLCNTRFUNC Programming error. Unsupported operation on the protocol (IP, UDP/IP, TCP/IP).

SS$_INSFMEM INET management or programming error returned when process resource mode wait is disabled. Not enough system space for buffering user data. A higher quota for socket buffer space needs to be set, or the internet needs more dynamic buffer space (number of dynamic clusters should be increased).

SS$_IVADDR Programming error. The specified INET address is not in the system, and an invalid port number or an INET address combination was specified with an IO$_WRITEVBLK operation.

An attempt to bind the socket failed because the INET address is not in the system, port number zero and INET address zero are not allowed, or port zero is not allowed with an IO$_ACCESS or IO$_WRITEVBLK function.
An attempt to get an interface INET address, broadcast mask, or network mask failed.
A send request was made on a datagram-oriented protocol, but the destination address is unknown or not specified.

SS$_IVBUFLEN Programming error.

The size of the buffer for an I/O function is insufficient.
An attempt was made to issue an IO$_WRITEVBLK function that specifies a correct buffer address ( p1 valid), but does not specify a buffer length ( p2 is null).

SS$_LINKDISCON Notification. Connection completion return code. The virtual circuit (TCP/IP) was closed at the initiative of the peer. The application must stop sending data and shutdown or close the socket.

SS$_PROTOCOL Programming error. The address family of the remote INET address specified with an IO$_WRITEVBLK function is not supported (UDP/IP or TCP/IP). The address family should be the UCX$C_AF_INET address family.

SS$_NOLINKS Programming error. The socket was not connected (TCP/IP) or an INET port and address were not specified with an IO$_ACCESS (UDP/IP or IP).

An IO$_WRITEVBLK with no remote INET socket address was issued on a socket that was not the object of an IO$_ACCESS function (raw IP).
An IO$_WRITEVBLK with no remote INET socket address was issued on a socket that was not the object of an IO$_ACCESS function (UDP/IP).
An attempt was made to disconnect a socket that is not connected, or an attempt was made to issue an IO$_WRITEVBLK or IO$_READVBLK function on an unconnected socket (TCP/IP).

SS$_SHUT The network is being shut down.

SS$_SUSPENDED The operation was blocked. A send operation requires system buffer space that is not available. The socket is marked as performing nonblocking operations.

SS$_TIMEOUT Programming error, INET management error, or hardware error.

A TCP/IP connection timed out after several unsuccessful retransmissions.
On a TCP socket where KEEPALIVE is set, the connection was idle for longer than the timeout interval (10 minutes by default).

SS$_TOOMUCHDATA Programming or INET management error. The message size was too large.

An IP packet that is broadcast cannot be fragmented.
The Not Fragment IP flag was set and the IP datagram was too large to be sent without being fragmented.
Internal error. The length of the Ethernet datagram does not allow enough space for the minimum IP header.
The message to be sent on a UDP/IP or raw IP socket is larger than the socket buffer high water allows.
An attempt was made to send or receive more than 16 buffers specified with the p5 argument.

SS$_UNREACHABLE Programming error. Either the network address is invalid or the network is unreachable.
Hardware error. The data link adapter detected an error and shut itself off. The UCX software is waiting for the adapter to come back on line.

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SS$_ABORT	Programming, INET management, or hardware error. The route entry already exists, so your attempt to add a route entry using the IO$_SETMODE function failed.
SS$_ACCVIO	Programming error. You attempted to access an invalid memory location or buffer.
SS$_BADPARAM	Programming error. The parameter you specified for a $QIO function was invalid for one of the following reasons: You attempted to execute the IO$_SETMODE subfunctions without specifying a device socket. Instead, create a device socket by issuing a $QIO with the IO$_SETMODE function and the proper parameters. You made an error specifying a socket option.
SS$_DEVACTIVE	INET management error. You attempted to change the static INET parameters. If you need new parameters, shut down the internet, reset the static parameters, and issue the START COMMUNICATION command.
SS$_DEVINACT	INET management error. The driver was not started. Issue a UCX START COMMUNICATION command before issuing $QIO functions.
SS$_DEVNOTMOUNT	INET management error. You improperly executed the startup procedure. The driver was loaded, but the INET_ACP was not activated. Execute the INET startup procedure again.
SS$_DUPLNAM	Programming error. You attempted to bind a port already in use so the operation to bind the socket to the address and port failed.
SS$_EXQUOTA	Programming or INET management error. The quota for the valid number of sockets caused an error for one of the following reasons: You attempted to exceed the maximum number of sockets by creating new socket with the IO$_SETMODE function. Increase the maximum number of allowable sockets (INET parameter) before creating more sockets. You specified a number of sockets with the IO$_SETMODE function that exceeds the maximum number of sockets allowed. Increase the maximum number of sockets (INET parameter) or reduce the number of sockets that the listener socket can create (listen parameter).
SS$_FILALRACC	Programming error. You attempted to bind the socket to an address that is already in use and the operation failed.
SS$_INSFMEM	Programming or system management error. Your system does not have enough resources to allocate new socket.
SS$_ILLCNTRFUNC	Programming error. Operation is not supported. Invalid IO$_SETMODE (IOCTL) function was used for the interface. The interface does not have an IOCTL routine. An attempt was made to perform an IO$_SETMODE (IOCTL) function that required a socket, but the device did not have one. Create a socket and issue the IOCTL function.
SS$_IVADDR	Programming error. The specified INET address is not in the system, and an invalid port number or an invalid INET address combination was specified with an IO$_SETMODE function (a bind). An attempt to bind the address failed because the INET address is not in the system, port zero and INET address zero are not allowed, or port zero is not allowed when using an IO$_ACCESS or IO$_WRITEVBLK function. An attempt to make a permanent entry in the ARP table failed because of lack of space. Too many permanent entries. An attempt was made to bind an IP socket (raw IP) when there are no interfaces defined in the system. An attempt was made to bind an IP socket (raw IP) to a null INET address.
SS$_IVBUFLEN	Programming error. The socket option buffer has an invalid size.
SS$_NOLICENSE	Programming or system management error. UCX license not present.
SS$_NOOPER	Programming or INET management error. An attempt was made to execute an I/O function that needs the OPER privilege.
SS$_NOPRIV	Programming or INET management error. Not enough privileges for the attempted operation. Broadcasting an IP datagram was denied because the process does not have a system UIC, SYSPRV, BYPASS, or OPER privileges. An attempt was made to use a reserved port number lower than 1024. An operation accesses only processes that have a system UIC, SYSPRV, or BYPASS privilege. Raw IP protocol can be used only on privileged sockets. The process must have a SYSPRV or BYPASS privilege.
SS$_NOSUCHDEV	Programming error or INET management error. An INET address is not in the ARP table. An attempt to show or delete an ARP table entry failed.
SS$_NOSUCHNODE	Programming error or INET management error. An attempt to delete a route from the routing table failed because a route entry was not found.
SS$_PROTOCOL	Programming error. The protocol type specified at socket creation is not valid. The protocol is not supported. The protocol type specified is not found in the internal tables. It is an invalid type. The address family is not supported: The address family specified with an IO$_SETMODE function (IOCTL subfunction) is not supported. The address family should be the UCX$C_AF_INET or UCX$C_UNSPEC address family. The address family of the remote INET address specified with an IO$_ACCESS or IO$_WRITEVBLK function is not supported (UDP/IP or TCP/IP). The address family should be the UCX$C_AF_INET address family. The address family of the local INET address specified with an IO$_SETMODE (bind) function is not supported. The address family should be the UCX$C_AF_INET address family. The address family of the INET address that is specified in a request to the routing module is not supported. The address family should be the UCX$C_AF_INET address family.
SS$_SHUT	The network is being shut down.

UCX usage	procedure entry mask
type	call without stack unwinding
access	by reference
mechanism	0

UCX usage	user_arg
type	longword (unsigned)
access	read only
mechanism	by value

UCX usage	acmode
type	longword (unsigned)
access	read only
mechanism	by value

SS$_ABORT	Programming error, INET management error, or hardware error. The route you specified with the IO$_SETMODE function already exists. Therefore, the operation failed.
SS$_ACCVIO	Programming error. You attempted to access an invalid memory location or buffer.
SS$_BADPARAM	Programming error. The parameter you specified for the $QIO I/O function was invalid for one of the following reasons: You attempted to execute the IO$_SETMODE functions without specifying a device socket. Instead, create a device socket by issuing a $QIO with the IO$_SETMODE function and the proper parameters. You made an error when specifying a socket option.
SS$_DEVACTIVE	INET management error. You attempted to change the static INET parameters. If you need new parameters, shut down the internet, reset the static parameters, and issue the START COMMUNICATION command.
SS$_DEVINACT	INET management error. The driver is not started. Issue a UCX START COMMUNICATION command before issuing $QIO functions.
SS$_DEVNOTMOUNT	INET management error. The INET startup procedure was improperly executed. The driver was loaded, but the INET_ACP was not activated. Execute the INET startup procedure again.
SS$_DUPLNAM	Programming error. Port that is being bound is already in use. An attempt to bind the socket to an address and port failed.
SS$_EXQUOTA	Programming or INET management error. You attempted to create a new socket with the IO$_SETMODE function and it failed because the maximum number of sockets was exceeded. Increase the maximum number of sockets (INET parameter) and then create a new socket. The number of sockets you specified with the IO$_SETMODE function exceeds the allowable maximum number of sockets. Increase the maximum number of sockets (INET parameter) or reduce the number of sockets that the listener socket can create (listen parameter).
SS$_FILALRACC	Programming error. Because the INET address is already in use, your attempt to bind the socket to an address and port failed.
SS$_INSFMEM	Programming or system management error. There are not enough resources to allocate new socket.
SS$_ILLCNTRFUNC	Programming error. You specified an operation that is unsupported for one of the following reasons: You used an invalid IO$_SETMODE function for the interface. The interface does not have an IOCTL routine. You attempted to execute an IO$_SETMODE function that required a socket, but the device did not have one. Instead, create a socket and issue the function.
SS$_IVADDR	Programming error. You specified an invalid port number and INET address combination with the IO$_SETMODE bind function. This caused the operation to fail for one of the following reasons: You specified an illegal combination of port zero and INET address zero. You specified port zero when using an IO$_ACCESS or IO$_WRITEVBLK function. When you attempted to make a permanent entry in the ARP table, the operation failed because of lack of space. There are too many permanent entries. You attempted to bind a raw IP socket when there were no interfaces defined in the system. You attempted to bind a raw IP socket to a null INET address.
SS$_IVBUFLEN	Programming error. You specified an invalid size for the socket option buffer.
SS$_NOLICENSE	Programming or system management error. There is no DIGITAL TCP/IP Services for OpenVMS license present.
SS$_NOOPER	Programming or INET management error. You attempted to execute an I/O function that needs the OPER privilege.
SS$_NOPRIV	Programming or INET management error. You attempted to execute an operation that failed for one of the following reasons: You cannot broadcast an IP datagram for a process if you do not have system UIC, SYSPRV, BYPASS, or OPER privileges. You attempted to use a reserved port number lower than 1024. You attempted to access a process when you do not have system UIC, SYSPRV, or BYPASS privileges. You attempted to use raw IP on a socket that is not a privileged sockets. To do this, the process must have SYSPRV or BYPASS privilege.
SS$_NOSUCHDEV	Programming error or INET management error. You attempted to show or delete an entry in the ARP table. However, because the INET address was not in the ARP table, the operation failed.
SS$_NOSUCHNODE	Programming error or INET management error. You attempted to delete a route from the routing information table (RIT). However, because the route was not found in the RIT, the operation failed.
SS$_PROTOCOL	Programming error. You specified an invalid protocol type when you created the socket. You specified an unsupported protocol. You specified a protocol type that is invalid because it is not found in the internal tables. You specified an address family that is not supported for one of the following reasons: You specified an address family with an IO$_SETMODE subfunction. Instead, specify the UCX$C_AF_INET or UCX$C_UNSPEC address family. You specified an address family of the remote INET address for a datagram or stream socket with an IO$_ACCESS or IO$_WRITEVBLK function. Instead, specify the UCX$C_AF_INET address family. You specified an address family of the local INET address with an IO$_SETMODE bind function. Instead, specify the UCX$C_AF_INET address family. You made a request to the routing module by specifying the address family of the INET address. Instead, specify the UCX$C_AF_INET address family.
SS$_SHUT	The network is being shut down.

UCX usage	buffer
type	longword (unsigned)
access	read only
mechanism	by reference

UCX usage	buffer length
type	longword (unsigned)
access	read only
mechanism	by value

UCX usage	remote socket name (message source)
type	longword (unsigned)
access	read only
mechanism	by descriptor

UCX usage	flags
type	longword (unsigned)
access	read only
mechanism	by value

UCX usage	UCX item_list_2
type	longword (unsigned)
access	read only
mechanism	by descriptor

DIGITAL TCP/IP Services for OpenVMSSystem Services and C Socket Programming

Condition Values Returned

IO$_SETMODE|IO$M_WRTATTN

ARGUMENTS

p1

p2

p3

DESCRIPTION

Condition Values Returned

IO$_WRITEVBLK

ARGUMENTS

p1

p2

p3

p4

p5

Function Modifiers

Condition Values Returned

DIGITAL TCP/IP Services for OpenVMS
System Services and C Socket Programming