OpenVMS System Services Reference Manual

Updated: 11 December 1998

OpenVMS System Services Reference Manual

Contents

Index

The OpenVMS Cluster management software assigns this system identification to the node. You can obtain this information by using the DCL command SHOW CLUSTER. Because the system identification is a 6-byte hexadecimal number, the buffer length field in the item descriptor should specify 6 (bytes).

SYI$_NODE_VOTES

When you specify SYI$_NODE_VOTES, $GETSYI returns the number (in decimal) of votes held by the node. This number is determined by the node's system parameter VOTES.

Because this number is a word in length, the buffer length field in the item descriptor should specify 2 (bytes).

SYI$_NODENAME

When you specify SYI$_NODENAME, $GETSYI returns, as a character string, the name of the node in the buffer specified in the item list.

Because this name can include up to 15 characters, the buffer length field in the item descriptor should specify 15 (bytes).

SYI$_PAGEFILE_FREE

When you specify SYI$_PAGEFILE_FREE, $GETSYI returns the number of free pages in the currently installed page files.

Because this number is a longword, the buffer length field in the item descriptor should specify 4 (bytes).

SYI$_PAGEFILE_PAGE

When you specify SYI$_PAGEFILE_PAGE, $GETSYI returns the number of pages in the currently installed page files.

Because this number is a longword, the buffer length field in the item descriptor should specify 4 (bytes).

SYI$_PAGE_SIZE

When you specify SYI$_PAGE_SIZE, $GETSYI returns the number of CPU-specific bytes per page in the system.

On VAX systems, when you specify SYI$_PAGE_SIZE, $GETSYI always returns 512.

On Alpha systems, CPU page size varies from system to system.

On Alpha and VAX systems, because this number is a longword, the buffer length field in the item descriptor should specify 4 (bytes).

SYI$_PFN_MEMORY_MAP

When you specify SYI$_PFN_MEMORY_MAP, $GETSYI returns a map describing the system's use of physical memory. The following figure shows an example of a physical memory map.

The first longword of the physical memory contains a count of descriptors. This number is equal to the value returned when the SYI$_PMD_COUNT item code is specified.

Each descriptor contains at least 3 longwords: a word containing the length of the descriptor (always use PMM$C_LENGTH when determining descriptor size); a flags word (whose bits are defined in the following table); and the starting PFN for that physical memory cluster and the number of PFNs in that cluster.

Bit Meaning When Set

PMM$V_CONSOLE The physical memory descriptor is in use by the console (hardware).

PMM$V_OPENVMS The physical memory descriptor is in use by OpenVMS.

PMM$V_AVAILABLE The physical descriptor is not in use by either the console (hardware) or OpenVMS.

Remaining bits The remaining bits in the PMM$W_FLAGS word are reserved for Compaq.

Bit	Meaning When Set
PMM$V_CONSOLE	The physical memory descriptor is in use by the console (hardware).
PMM$V_OPENVMS	The physical memory descriptor is in use by OpenVMS.
PMM$V_AVAILABLE	The physical descriptor is not in use by either the console (hardware) or OpenVMS.
Remaining bits	The remaining bits in the PMM$W_FLAGS word are reserved for Compaq.

The structure definition for the physical memory descriptor resides in PMMDEF.H.

Because the size of the physical memory map returned by $GETSYI can vary from system to system, Compaq recommends using the following steps when using this item code.

Call $GETSYI first using the SYI$_PMD_COUNT to obtain the number of physical memory descriptors.
Dynamically create a buffer to which $GETSYI can copy the physical memory map. The size of the buffer can be computed with the following formula:
map_buffer_size = (PMM$C_LENGTH * ret-val) + 4
where:
- PMM$C_LENGTH is the size of an individual physical memory descriptor.
- ret-val is the return value from a call to $GETSYI specifying the SYI$_PMD_COUNT item code.
- 4 is the number of bytes occupied by the descriptor count in the physical memory map.

SYI$_PHYSICALPAGES

When you specify SYI$_PHYSICALPAGES, $GETSYI returns the total number of PFNs that exist between the first PFN (typically PFN 0) and the highest numbered PFN.

Because this number is a longword, the buffer length field in the item descriptor should specify 4 (bytes).

SYI$_PMD_COUNT

When you specify SYI$_PMD_COUNT, $GETSYI returns the total number of physical memory descriptors defined by the system. The return value of this parameter can be used to determine the buffer size to use when specifying the SYI$_PFN_MEMORY_MAP item code.

Because this number is a longword, the buffer length field in the item descriptor should specify 4 (bytes).

SYI$_PRIMARY_CPUID

On Alpha systems, when you specify SYI$_PRIMARY_CPUID, $GETSYI returns the ID of the primary CPU in the current boot of the symmetric multiprocessing (SMP) system.

SYI$_PROCESS_SPACE_LIMIT

On Alpha systems, this item code returns the 64-bit virtual address succeeding the last available process private address. The value returned is the upper bound on the process private address space. The value returned is the same for every process on the system.

Because this number is a quadword, the buffer length field in the item descriptor should specify 8 (bytes).

SYI$_PSXFIFO_PRIO_MAX

On Alpha systems, when you specify SYI$_PSXFIFO_PRIO_MAX, $GETSYI returns the maximum priority for the POSIX FIFO scheduling policy.

Because this number is a longword, the buffer length field in the item descriptor should specify 4 (bytes).

SYI$_PSXFIFO_PRIO_MIN

On Alpha systems, when you specify SYI$_PSXFIFO_PRIO_MIN, $GETSYI returns the minimum priority for the POSIX FIFO scheduling policy.

Because this number is a longword, the buffer length field in the item descriptor should specify 4 (bytes).

SYI$_PSXRR_PRIO_MAX

On Alpha systems, when you specify SYI$_PSXRR_PRIO_MAX, $GETSYI returns the maximum priority for the POSIX round-robin scheduling policy.

Because this number is a longword, the buffer length field in the item descriptor should specify 4 (bytes).

SYI$_PSXRR_PRIO_MIN

On Alpha systems, when you specify SYI$_PSXRR_PRIO_MIN, $GETSYI returns the minimum priority for the POSIX round-robin scheduling policy.

Because this number is a longword, the buffer length field in the item descriptor should specify 4 (bytes).

SYI$_PT_BASE

On Alpha systems, when you specify SYI$_PT_BASE, $GETSYI returns the 64-bit virtual address of the base of the page tables. The value returned is the same for every process on the system.

Because this number is a quadword, the buffer length field in the item descriptor should specify 8 (bytes).

SYI$_PTES_PER_PAGE

On Alpha systems, when you specify SYI$_PTES_PER_PAGE, $GETSYI returns the maximum number of CPU-specific pages that can be mapped by one page table page.

Because this number is a longword, the buffer length field in the item descriptor should specify 4 (bytes).

SYI$_REAL_CPUTYPE

When you specify SYI$_REAL_CPUTYPE, $GETSYI returns the actual CPU type of the primary CPU of the system.

See the SYI$_CPUTYPE item code for a list of symbols and processors.

SYI$_SCS_EXISTS

When you specify SYI$_SCS_EXISTS, $GETSYI returns a longword value that is interpreted as Boolean. If the value is 1, the System Communication Subsystem (SCS) is currently loaded on the node; if the value is 0, the SCS is not currently loaded.

SYI$_SHARED_VA_PTES

On Alpha systems, when you specify SYI$_SHARED_VA_PTES, $GETSYI returns the 64-bit virtual address of the PTE that marks the boundary between process-private PTEs and system-shared PTEs. The value returned is the same for every process on the system.

Because this number is a quadword, the buffer length field in the item descriptor should specify 8 (bytes).

SYI$_SID

When you specify SYI$_SID, $GETSYI returns the contents of the system identification register of the node.

On Alpha systems, SYI$_SID returns a value in which all fields are 0 except the CPU-type field, which always contains the value 256.

Because the value of this register is a longword hexadecimal number, the buffer length field in the item descriptor should specify 4 (bytes).

SYI$_SWAPFILE_FREE

When you specify SYI$_SWAPFILE_FREE, $GETSYI returns the number of free pages in the currently installed swapping files.

Because this number is a longword, the buffer length field in the item descriptor should specify 4 (bytes).

SYI$_SWAPFILE_PAGE

When you specify SYI$_SWAPFILE_PAGE, $GETSYI returns the number of pages in the currently installed swapping files.

Because this number is a longword, the buffer length field in the item descriptor should specify 4 (bytes).

SYI$_SYSTEM_RIGHTS

When you specify SYI$_SYSTEM_RIGHTS, $GETSYI returns the system rights list as an array of quadword identifiers. Each entry consists of a longword identifier value and the following longword identifier attributes.

Bit Position	Meaning When Set
KGB$V_DYNAMIC	Allows holders of the identifier to remove it from or add it to the process rights list using the DCL command SET RIGHTS_LIST.
KGB$V_NOACCESS	Makes any access rights of the identifier null and void. This attribute is intended as a modifier for a resource identifier or the Subsystem attribute.
KGB$V_RESOURCE	Allows holders of an identifier to charge disk space to the identifier. It is used only for file objects.
KGB$V_SUBSYSTEM	Allows holders of the identifier to create and maintain protected subsystems by assigning the Subsystem ACE to the application images in the subsystem.

Allocate a buffer that is sufficient to hold the system rights list, because $GETSYI returns only as much of the list as will fit in the buffer.

SYI$_SYSTYPE

On Alpha systems, when you specify SYI$_SYSTYPE, $GETSYI returns the name of the family or system hardware platform. For example, the integer 2 represents a DEC 4000 processor, the integer 3 represents a DEC 7000 or DEC 10000 processor, and the integer 4 represents a DEC 3000 processor.

SYI$_VERSION

When you specify SYI$_VERSION, $GETSYI returns, as a character string, the software version number of the OpenVMS operating system running on the node.

Because the version number is 8-byte blank-filled, the buffer length field in the item descriptor should specify 8 (bytes).

SYI$_VECTOR_EMULATOR

When you specify SYI$_VECTOR_EMULATOR, $GETSYI returns a byte, the low-order bit of which, when set, indicates the presence of the Vector Instruction Emulator facility (VVIEF) in the system.

SYI$_VP_MASK

When you specify SYI$_VP_MASK, $GETSYI returns a longword mask, the bits of which, when set, indicate which processors in the system have vector coprocessors.

SYI$_VP_NUMBER

When you specify SYI$_VP_NUMBER, $GETSYI returns an unsigned longword containing the number of vector processors in the system.

SYI$_XCPU

When you specify SYI$_XCPU, $GETSYI returns the extended CPU processor type of the node.

You should obtain the general processor type value first by using the SYI$_CPU item code. For some of the general processor types, extended processor type information is provided by the item code, SYI$_XCPU. For other general processor types, the value returned by the SYI$_XCPU item code is currently undefined.

Because the processor type is a longword decimal number, the buffer length field in the item descriptor should specify 4 (bytes).

On VAX systems, the $PRDEF macro defines the following symbols for the extended processor types.

VAX
Processor
Type Symbol Extended
Processor
Type Extended
Processor
Symbol

PR$_SID_TYPUV MicroVAX II
VAXstation II PR$_XSID_UV_UV2

MicroVAX 2000
VAXstation 2000 PR$_XSID_UV_410

PR$_SID_TYPCV MicroVAX 3300, 3400, 3500, 3600, 3800, 3900 series PR$_XSID_CV_650

VAX 6000-200, 6000-300 series PR$_XSID_CV_9CC

VAXstation 3520, 3540 PR$_XSID_CV_60

VAXstation 3100 series PR$_XSID_CV_420

VAXft 3000 Model 310 PR$_XSID_CV_520

PR$_SID_TYP8NN VAX 8530 PRS$_XSID_N8500

VAX 8550 PRS$_XSID_N8550

VAX 8810 (8700) PRS$_XSID_N8700

VAX 8820-N (8800) PRS$_XSID_N8800

PR$_SID_TYPRV VAX 4000-300 PR$_XSID_RV_670

VAX 6000-400 series PR$_XSID_RV_9RR

VAX Processor Type Symbol	Extended Processor Type	Extended Processor Symbol
PR$_SID_TYPUV	MicroVAX II VAXstation II	PR$_XSID_UV_UV2
	MicroVAX 2000 VAXstation 2000	PR$_XSID_UV_410
PR$_SID_TYPCV	MicroVAX 3300, 3400, 3500, 3600, 3800, 3900 series	PR$_XSID_CV_650
	VAX 6000-200, 6000-300 series	PR$_XSID_CV_9CC
	VAXstation 3520, 3540	PR$_XSID_CV_60
	VAXstation 3100 series	PR$_XSID_CV_420
	VAXft 3000 Model 310	PR$_XSID_CV_520
PR$_SID_TYP8NN	VAX 8530	PRS$_XSID_N8500
	VAX 8550	PRS$_XSID_N8550
	VAX 8810 (8700)	PRS$_XSID_N8700
	VAX 8820-N (8800)	PRS$_XSID_N8800
PR$_SID_TYPRV	VAX 4000-300	PR$_XSID_RV_670
	VAX 6000-400 series	PR$_XSID_RV_9RR

SYI$_XSID

When you specify SYI$_XSID, $GETSYI returns processor-specific information. For the MicroVAX II system, this information is the contents of the system type register of the node. The system type register contains the full extended information used in determining the extended system type codes. For other processors, the data returned by SYI$_XSID is currently undefined.

Because the value of this register is a longword hexadecimal number, the buffer length field in the item descriptor should specify 4 (bytes).

SYI$_xxxx

When you specify SYI$_xxxx, $GETSYI returns the current value of the system parameter named xxxx for the node.

The buffer must specify a longword into which $GETSYI writes the value of the specified system parameter. For a list and description of all system parameters, refer to the OpenVMS System Manager's Manual.

Description

The Get Systemwide Information service returns information about the local system or about other systems in an OpenVMS Cluster configuration.
Required Access or Privileges

None
Required Quota

This service uses the process's AST limit quota (ASTLM).
Related Services

$ALLOC, $ASSIGN, $BRKTHRU, $BRKTHRUW, $CANCEL, $CREMBX, $DALLOC, $DASSGN, $DELMBX, $DEVICE_SCAN, $DISMOU, $GETDVI, $GETDVIW, $GETMSG, $GETQUI, $GETQUIW, $INIT_VOL, $MOUNT, $PUTMSG, $QIO, $QIOW, $SNDERR, $SNDJBC, $SNDJBCW, $SNDOPR

Condition Values Returned

SS$_NORMAL The service completed successfully.

SS$_ACCVIO The caller cannot read the item list, cannot write to the buffer specified by the buffer address field in an item descriptor, or cannot write to the return length address field in an item descriptor.

SS$_BADPARAM The item list contains an invalid item code.

SS$_EXASTLM The process has exceeded its AST limit quota.

SS$_NOMORENODE You requested a wildcard operation, and $GETSYI has returned information about all available nodes.

SS$_NOSUCHNODE The specified node does not exist or is not currently a member of the OpenVMS Cluster system.

Condition Values Returned in the I/O Status Block

Same as those returned in R0.

Example


/* Defining __NEW_STARLET enables the program to benefit from better type checking for prototypes and structures provided by OpenVMS. / #define __NEW_STARLET 1 #include <efndef> / No Event Flag Event Flag / #include <iledef> / Item List Entry Definitions / #include <iosbdef> / I/O Status Block Structure Definition / #include <starlet> / Function Prototypes for System Services / #include <stdio> / C Standard I/O Functions / #include <string> / memset Prototype / #include <syidef> / $GETSYI Item Code Definitions / #define NUM_ILE 3 #define BUFFER_SIZE 20 / Macro to initialize a 32-bit item_list_3. / #define init_ile32(ile, length, code, bufaddr, retlen_addr) \ { (ile)->ile3$w_length = (length); \ (ile)->ile3$w_code = (code); \ (ile)->ile3$ps_bufaddr = (bufaddr); \ (ile)->ile3$ps_retlen_addr = (retlen_addr); } / Simple status checking macro. / #define bad_status(status) (((status) & 1) != 1) main () { char node_name [BUFFER_SIZE], version_string [BUFFER_SIZE]; int status; unsigned short node_name_length, version_string_length; ILE3 syi_ile [NUM_ILE]; IOSB iosb; / Zeroing the item list has the effect of creating the terminating entry. / memset (syi_ile, 0, ILE3$K_LENGTHNUM_ILE); /* Initialize the item list entries to fetch the operating system version and the node name. / init_ile32 ( &syi_ile [0], BUFFER_SIZE, SYI$_VERSION, version_string, &version_string_length); init_ile32 ( &syi_ile [1], BUFFER_SIZE, SYI$_NODENAME, node_name, &node_name_length); status = sys$getsyiw ( EFN$C_ENF, NULL, NULL, &syi_ile, &iosb, NULL, 0); if (bad_status (status)) return status; if (bad_status (iosb.iosb$w_status)) return iosb.iosb$w_status; / Zero terminate the strings before displaying them. */ version_string [version_string_length] = '\0'; node_name [node_name_length] = '\0'; printf ("Version: %s Node Name: %s\n", version_string, node_name); }

/*  Defining __NEW_STARLET enables the program to benefit from better type 
    checking for prototypes and structures provided by OpenVMS.             */ 
 
#define     __NEW_STARLET       1 
 
#include    <efndef>            /*  No Event Flag Event Flag  */ 
#include    <iledef>            /*  Item List Entry Definitions  */ 
#include    <iosbdef>           /*  I/O Status Block Structure Definition  */ 
#include    <starlet>           /*  Function Prototypes for System Services  */ 
#include    <stdio>             /*  C Standard I/O Functions  */ 
#include    <string>            /*  memset Prototype  */ 
#include    <syidef>            /*  $GETSYI Item Code Definitions  */ 
 
#define     NUM_ILE              3 
#define     BUFFER_SIZE         20 
 
 
/*  Macro to initialize a 32-bit item_list_3.                               */ 
 
#define init_ile32(ile, length, code, bufaddr, retlen_addr) \
{   (ile)->ile3$w_length = (length);           \
    (ile)->ile3$w_code = (code);         \
    (ile)->ile3$ps_bufaddr = (bufaddr); \
    (ile)->ile3$ps_retlen_addr = (retlen_addr); } 
 
 
/*  Simple status checking macro.                                           */ 
 
#define bad_status(status) (((status) & 1) != 1) 
 
main () 
{ 
char 
    node_name [BUFFER_SIZE], 
    version_string [BUFFER_SIZE]; 
 
int 
    status; 
 
unsigned short 
    node_name_length, 
    version_string_length; 
 
ILE3 
    syi_ile [NUM_ILE]; 
 
IOSB 
    iosb; 
 
 
/*  Zeroing the item list has the effect of creating the terminating entry. */ 
 
    memset (syi_ile, 0, ILE3$K_LENGTH*NUM_ILE); 
 
 
/*  Initialize the item list entries to fetch the operating system version 
    and the node name.                                                      */ 
 
    init_ile32 ( 
        &syi_ile [0], 
        BUFFER_SIZE, 
        SYI$_VERSION, 
        version_string, 
        &version_string_length); 
 
    init_ile32 ( 
        &syi_ile [1], 
        BUFFER_SIZE, 
        SYI$_NODENAME, 
        node_name, 
        &node_name_length); 
 
    status = sys$getsyiw ( 
        EFN$C_ENF, 
        NULL, 
        NULL, 
        &syi_ile, 
        &iosb, 
        NULL, 
        0); 
 
    if (bad_status (status)) return status; 
    if (bad_status (iosb.iosb$w_status)) return iosb.iosb$w_status; 
 
 
/*  Zero terminate the strings before displaying them.                      */ 
 
    version_string [version_string_length] = '\0'; 
    node_name [node_name_length] = '\0'; 
 
    printf ("Version:  %s    Node Name:  %s\n", 
        version_string, 
        node_name); 
}

This example C program demonstrates how to use $GETSYIW to obtain the operating system version number string and the node name.

$GETSYIW

Returns information about the local system or about other systems in a cluster.
The $GETSYIW service completes synchronously; that is, it returns to the caller with the requested information. For asynchronous completion, use the Get Systemwide Information ($GETSYI) service; $GETSYI returns to the caller after queuing the information request, without waiting for the information to be returned. In all other respects, these services are identical; refer to the documentation about $GETSYI for information about the $GETSYIW service.
For additional information about system service completion, refer to the Synchronize ($SYNCH) service.
On Alpha systems, this service accepts 64-bit addresses.

Format

SYS$GETSYIW [efn] ,[csidadr] ,[nodename] ,itmlst [,iosb] [,astadr] [,astprm]

C Prototype

int sys$getsyiw (unsigned int efn, unsigned int *csidadr, void *nodename, void *itmlst, struct _iosb *iosb, void (*astadr)(__unknown_params), int astprm);

You must specify either the csidadr or the nodename argument, but not both. For wildcard operations, however, you must use the csidadr argument.

$GETTIM

Returns the current system time in a 64-bit format.
On Alpha systems, this service accepts 64-bit addresses.

Format

SYS$GETTIM timadr

C Prototype

int sys$gettim (struct _generic_64 *timadr);

Argument

timadr

OpenVMS usage: date_time

type: quadword (unsigned)

access: write only

mechanism: by 32- or 64-bit reference (Alpha)

mechanism: by 32-bit reference (VAX)

The 32- or 64-bit address (on Alpha systems) or the 32-bit address (on VAX systems) of a quadword to receive the current time in 64-bit format.

Description

The Get Time service returns the current system time in 64-bit format. The time is returned in 100-nanosecond units from the system base time.
On Alpha systems, the frequency at which system time is updated varies, depending on the clock frequency of the Alpha processor.
On VAX systems, system time is updated every 10 milliseconds.
Required Access or Privileges

None
Required Quota

None
Related Services

$ASCTIM, $BINTIM, $CANTIM, $CANWAK, $NUMTIM, $SCHDWK, $SETIME, $SETIMR
For additional information about the system time, see the OpenVMS System Manager's Manual.

Condition Values Returned

SS$_NORMAL The service completed successfully.

SS$_ACCVIO The quadword to receive the time cannot be written by the caller.

$GETUAI

Returns authorization information about a specified user.

Format

SYS$GETUAI [nullarg] ,[contxt] ,usrnam ,itmlst ,[nullarg] ,[nullarg] ,[nullarg]

C Prototype

int sys$getuai (unsigned int efn, unsigned int *contxt, void *usrnam, void *itmlst, struct _iosb *iosb, void (*astadr)(__unknown_params), int astprm);

Arguments

nullarg

OpenVMS usage: null_arg

type: longword (unsigned)

access: read only

mechanism: by value

Placeholding argument reserved to Compaq.
usrnam

OpenVMS usage: char_string

type: character-coded text string

access: read only

mechanism: by descriptor--fixed-length string descriptor

Name of the user about whom $GETUAI returns authorization information. The usrnam argument is the address of a descriptor pointing to a character text string containing the user name. The user name string can contain a maximum of 12 alphanumeric characters.
itmlst

OpenVMS usage: item_list_3

type: longword (unsigned)

access: read only

mechanism: by reference

Item list specifying which information from the specified user's user authorization file (UAF) record is to be returned. The itmlst argument is the address of a list of one or more item descriptors, each of which specifies an item code. The item list is terminated by an item code value of 0 or by a longword value of 0.
The following diagram depicts the structure of a single item descriptor.

The following table defines the item descriptor fields.

Descriptor Field Definition

Buffer length A word specifying the length (in bytes) of the buffer in which $GETUAI is to write the information. The length of the buffer varies, depending on the item code specified in the item code field of the item descriptor, and is given in the description of each item code. If the value of the buffer length field is too small, $GETUAI truncates the data.

Item code A word containing a user-supplied symbolic code specifying the item of information that $GETUAI is to return. The $UAIDEF macro defines these codes.

Buffer address A longword containing the user-supplied address of the buffer in which $GETUAI is to write the information.

Return length address A longword containing the user-supplied address of a word in which $GETUAI writes the length in bytes of the information it actually returned.

Descriptor Field	Definition
Buffer length	A word specifying the length (in bytes) of the buffer in which $GETUAI is to write the information. The length of the buffer varies, depending on the item code specified in the item code field of the item descriptor, and is given in the description of each item code. If the value of the buffer length field is too small, $GETUAI truncates the data.
Item code	A word containing a user-supplied symbolic code specifying the item of information that $GETUAI is to return. The $UAIDEF macro defines these codes.
Buffer address	A longword containing the user-supplied address of the buffer in which $GETUAI is to write the information.
Return length address	A longword containing the user-supplied address of a word in which $GETUAI writes the length in bytes of the information it actually returned.

The symbolic codes have the following format:

$UAI_code

See the Item Codes section for descriptions of the various $GETUAI item codes.

contxt

OpenVMS usage:	longword
type:	longword (unsigned)
access:	modify
mechanism:	by reference

On VAX systems, an optional longword used to maintain an open channel to the authorization file. The contxt argument is the address of a longword to receive a $GETUAI context value. If the contxt argument is specified on the initial call, this longword should contain the value --1, and on subsequent calls, the value of the contxt argument from the previous call should be passed back in.

Item Codes

UAI$_ACCOUNT
When you specify UAI$_ACCOUNT, $GETUAI returns, as a blank-filled 32-character string, the account name of the user.
An account name can include up to 8 characters. Because the account name is a blank-filled string, however, the buffer length field of the item descriptor should specify 32 (bytes).
UAI$_ASTLM
When you specify UAI$_ASTLM, $GETUAI returns the AST queue limit.
Because this decimal number is a word in length, the buffer length field in the item descriptor should specify 2 (bytes).
UAI$_BATCH_ACCESS_P
When you specify UAI$_BATCH_ACCESS_P, $GETUAI returns, as a 3-byte value, the range of times during which batch access is permitted for primary days. Each bit set represents a 1-hour period, from bit 0 as midnight to 1 a.m. to bit 23 as 11 p.m. to midnight.

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SS$_NORMAL	The service completed successfully.
SS$_ACCVIO	The caller cannot read the item list, cannot write to the buffer specified by the buffer address field in an item descriptor, or cannot write to the return length address field in an item descriptor.
SS$_BADPARAM	The item list contains an invalid item code.
SS$_EXASTLM	The process has exceeded its AST limit quota.
SS$_NOMORENODE	You requested a wildcard operation, and $GETSYI has returned information about all available nodes.
SS$_NOSUCHNODE	The specified node does not exist or is not currently a member of the OpenVMS Cluster system.

OpenVMS usage:	date_time
type:	quadword (unsigned)
access:	write only
mechanism:	by 32- or 64-bit reference (Alpha)
mechanism:	by 32-bit reference (VAX)

OpenVMS usage:	null_arg
type:	longword (unsigned)
access:	read only
mechanism:	by value

OpenVMS usage:	char_string
type:	character-coded text string
access:	read only
mechanism:	by descriptor--fixed-length string descriptor

OpenVMS usage:	item_list_3
type:	longword (unsigned)
access:	read only
mechanism:	by reference