HP OpenVMS System Services Reference Manual


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These privileges are returned in a quadword privilege mask and are defined by the $PRVDEF macro.

JPI$_PERSONA_ID

On Alpha and I64 systems, returns, as a longword integer, the ID of the persona.

JPI$_PERSONA_PERMPRIV

On Alpha and I64 systems, returns the permanent (default) privilege mask of the persona. These privileges are returned in a quadword privilege mask and are defined by the $PRVDEF macro.

JPI$_PERSONA_RIGHTS

On Alpha and I64 systems, returns the binary content of the persona rights list as an array of quadword identifiers. Each entry consists of a longword identifier value and longword identifier attributes, as listed in Table SYS-43. The persona rights list is a set of identifiers associated with the process.

JPI$_PERSONA_RIGHTS_SIZE

On Alpha and I64 systems, returns a longword integer containing the number of bytes needed to store the persona rights.

JPI$_PERSONA_WORKPRIV

On Alpha and I64 systems, returns the privilege mask of the working (active) persona. These privileges are returned in a quadword privilege mask and are defined by the $PRVDEF macro.

JPI$_PGFLQUOTA

Returns the paging file quota (maximum virtual page count) of the process, which is a longword integer value, measured in pages (on VAX systems) or pagelets (on Alpha and I64 systems).

JPI$_PHDFLAGS

Returns the process header flags as a longword bit vector.

JPI$_PID

Returns the process identification (PID) of the process. The PID is a longword hexadecimal value.

JPI$_P0_FIRST_FREE_VA_64

On Alpha and I64 systems, this item code returns the 64-bit virtual address of the first free page at the end of the program region (P0 space) of the process.

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

JPI$_P1_FIRST_FREE_VA_64

On Alpha and I64 systems, this item code returns the 64-bit virtual address of the first free page at the end of the control region (P1 space) of the process.

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

JPI$_P2_FIRST_FREE_VA_64

On Alpha and I64 systems, this item code returns the 64-bit virtual address of the first free page at the end of P2 space of the process.

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

JPI$_PPGCNT

Returns the number of pages (on VAX systems) or pagelets (on Alpha and I64 systems) the process has in the working set. This is a longword integer value.

JPI$_PRCCNT

Returns, as a longword integer value, the number of subprocesses created by the process. The number returned by JPI$_PRCCNT does not include any subprocesses created by subprocesses of the process named in the procnam argument.

JPI$_PRCLM

Returns the subprocess quota of the process, which is a longword integer value.

JPI$_PRCNAM

Returns, as a character string, the name of the process. Because the process name can include up to 15 characters, the buffer length field of the item descriptor should specify at least 15 bytes.

JPI$_PRI

Returns the current priority of the process, which is a longword integer value.

JPI$_PRIB

Returns the base priority of the process, which is a longword integer value.

JPI$_PROCESS_RIGHTS

Returns the binary content of the process rights list as an array of quadword identifiers. Each entry consists of a longword identifier value and longword identifier attributes, as shown in Table SYS-43. Allocate a buffer that is sufficient to hold the process rights list because $GETJPI returns only as much of the list as will fit in the buffer.

JPI$_PROC_INDEX

Returns, as a longword integer value, the process index number of the process. The process index number is a number between 1 and the system parameter MAXPROCESSCNT, which identifies the process. Although process index numbers are reassigned to different processes over time, at any one instant, each process in the system has a unique process index number.

You can use the process index number as an index into system global sections. Because the process index number is unique for each process, its use as an index into system global sections guarantees no collisions with other system processes accessing those sections.

The process index is intended to serve users who formerly used the low-order word of the PID as an index number.

JPI$_PROCPRIV

Returns the default privileges of the process in a quadword bit mask.

JPI$_RIGHTSLIST

Returns, as an array of quadword identifiers, all identifiers applicable to the process. This includes the process rights list (JPI$_PROCESS_RIGHTS) and the system rights list (JPI$_SYSTEM_RIGHTS). Each entry consists of a longword identifier value and longword identifier attributes, shown in Table SYS-43. Allocate a buffer that is sufficient to hold the rights list because $GETJPI returns only as much of the list as will fit in the buffer.

JPI$_RIGHTS_SIZE

Returns the number of bytes required to buffer the rights list. The rights list includes both the system rights list and the process rights list. Because the space requirements for the rights list can change between the time you request the size of the rights list and the time you fetch the rights list with JPI$_RIGHTSLIST, you might want to allocate a buffer that is 10 percent larger than this item indicates.

JPI$_RMS_DFMBC

Returns the default multiblock count.

JPI$_RMS_DFMBFIDX

Returns the default multibuffer count for local buffers for indexed file operations.

JPI$_RMS_DFMBFREL

Returns the default multibuffer count for local buffers for relative file operations.

JPI$_RMS_DFMBFSDK

Returns the default multibuffer count for local buffers for sequential file operations on disk.

JPI$_RMS_DFMBFSMT

Returns the default multibuffer count for local buffers for sequential file operations on magnetic tape.

JPI$_RMS_DFMBFSUR

Returns the default multibuffer count for file operation on unit record devices.

JPI$_RMS_DFNBC

Returns the default block count for local buffers for network access to remote files.

JPI$_RMS_EXTEND_SIZE

Returns the default number of blocks used to extend a sequential file.

JPI$_RMS_FILEPROT

Returns the default file protection.

JPI$_RMS_PROLOGUE

Returns the default prolog level for indexed files.

JPI$_SCHED_CLASS_NAME

Returns the name of the scheduling class (as a character string) to which this process belongs. Because the class name can include up to 16 characters, the buffer length field of the item descriptor must specify at least 16 bytes. If the process is not class scheduled, then a return length of 0 is returned to the caller.

JPI$_SCHED_POLICY

On Alpha and I64 systems, returns the current scheduling policy of the specified process. Definitions of the policy values are in the $JPIDEF macro. The buffer length of the item descriptor should specify 4 (bytes).

JPI$_SHRFILLM

Returns the maximum number of open shared files allowed for the job to which the process specified in the call to $GETJPI belongs. This limit is set in the UAF record of the user who owns the process. The number is returned as a word decimal value. A value of 0 means that there is no limit on the number of open shared files for that job.

JPI$_SITESPEC

Returns the per-process, site-specific longword, which is a longword integer value.

JPI$_SLOW_VP_SWITCH

On VAX systems, returns an unsigned longword containing the number of times this process has issued a vector instruction that resulted in an inactive vector processor being enabled with a full vector context switch. This vector context switch involves the saving of the vector context of the process that last used the vector processor and the restoration of the vector context of the current process.

JPI$_STATE

Returns the state of the process, which is a longword integer value. Each state has a symbolic representation. If the process is currently executing, its state is always SCH$K_CUR. STATEDEF defines the following symbols, which identify the various possible states:
State Description
SCH$C_CEF Common event flag wait
SCH$C_COM Computable
SCH$C_COMO Computable, out of balance set
SCH$C_CUR Current process
SCH$C_COLPG Collided page wait
SCH$C_FPG Free page wait
SCH$C_HIB Hibernate wait
SCH$C_HIBO Hibernate wait, out of balance set
SCH$C_LEF Local event flag wait
SCH$C_LEFO Local event flag wait, out of balance set
SCH$C_MWAIT Mutex and miscellaneous resource wait
SCH$C_PFW Page fault wait
SCH$C_SUSP Suspended
SCH$C_SUSPO Suspended, out of balance set

JPI$_STS

Returns the first longword of the process status flags, which are contained in a longword bit vector. PCBDEF definitions include the following symbols for these flags:
Symbol Description
PCB$V_ASTPEN AST pending
PCB$V_BATCH Process is a batch job
PCB$V_DELPEN Delete pending
PCB$V_DISAWS Disable automatic working set adjustment
PCB$V_FORCPEN Force exit pending
PCB$V_HARDAFF Process bound to a particular CPU
PCB$V_HIBER Hibernate after initial image activate
PCB$V_INQUAN Initial quantum in progress
PCB$V_INTER Process is an interactive job
PCB$V_LOGIN Log in without reading authorization file
PCB$V_NETWRK Process is a network connect object
PCB$V_NOACNT No accounting for process
PCB$V_NODELET No delete
PCB$V_PHDRES Process header resident
PCB$V_PREEMPTED Kernel mode suspend has overridden supervisor mode suspend
PCB$V_PSWAPM Process swap mode (1=noswap)
PCB$V_PWRAST Power fail AST
PCB$V_RECOVER Process can recover locks
PCB$V_RES Resident, in balance set
PCB$V_RESPEN Resume pending, skip suspend
PCB$V_SECAUDIT Mandatory security auditing
PCB$V_SOFTSUSP Process is in supervisor mode suspend
PCB$V_SSFEXC System service exception enable (kernel)
PCB$V_SSFEXCE System service exception enable (exec)
PCB$V_SSFEXCS System service exception enable (super)
PCB$V_SSFEXCU System service exception enable (user)
PCB$V_SSRWAIT System service resource wait disable
PCB$V_SUSPEN Suspend pending
PCB$V_WAKEPEN Wake pending, skip hibernate
PCB$V_WALL Wait for all events in mask

JPI$_STS2

Returns the second longword of the process status flags, which are contained in a longword bit vector. PCBDEF defines the following symbol for these flags:
Symbol Description
PCB$V_NOUNSHELVE Process does not automatically unshelve files.

JPI$_SUBSYSTEM_RIGHTS

On Alpha and I64 systems, returns the binary content of the subsystem rights list as an array of quadword identifiers. Each entry consists of a longword identifier value and longword identifier attributes, as listed in Table SYS-43. The subsystem rights list is a set of identifiers associated with a protected subsystem image.

When a process runs a protected subsystem, the subsystem rights are automatically added to the process's image rights list. These identifiers are subsequently removed during image rundown. Allocate a buffer that is sufficient to hold the subsystem rights list, because $GETJPI returns only as much of the list as will fit in the buffer.

JPI$_SUBSYSTEM_RIGHTS_SIZE

On Alpha and I64 systems, returns a longword integer containing the number of bytes needed to store the subsystem rights.

JPI$_SWPFILLOC

Returns the location of the process's swapping file, which is a longword hexadecimal value. If the number returned is positive, the fourth byte of this value identifies a specific swapping file, and the lower three bytes contain the VBN within the swapping file. If the number returned is 0 or negative, the swap file location information is not currently available for the process.

JPI$_SYSTEM_RIGHTS

Returns the system rights list as an array of quadword identifiers. Each entry consists of a longword identifier value and longword identifier attributes, listed in Table SYS-43. Allocate a buffer that is sufficient to hold the system rights list because $GETJPI only returns as much of the list as will fit in the buffer.

JPI$_SYSTEM_RIGHTS_SIZE

On Alpha and I64 systems, returns a longword integer containing the number of bytes needed to store the system rights.

JPI$_TABLENAME

Returns the file specification of the process's current command language interpreter (CLI) table. Because the file specification can include up to 255 characters, the buffer length field in the item descriptor should specify 255 bytes.

JPI$_TERMINAL

Returns, for interactive users, the process's login terminal name as a character string. Because the terminal name can include up to 16 characters, the buffer length field in the item descriptor should specify at least 16 bytes. Trailing zeros are written to the output buffer if necessary.

JPI$_THREAD_INDEX

On Alpha and I64 systems, returns the kernel thread index for the target thread or process, which is a longword integer value.

JPI$_TMBU

Returns the termination mailbox unit number, which is a longword integer value.

JPI$_TQCNT

Returns the remaining timer queue entry quota of the process, which is a longword integer value.

JPI$_TQLM

Returns the process's limit on timer queue entries, which is a longword integer value.

JPI$_TT_ACCPORNAM

Returns the access port name for the terminal associated with the process. (The terminal name is returned by JPI$_TERMINAL.) This item code can return the following information:

JPI$_TT_PHYDEVNAM

Returns the physical device name of the terminal associated with the process. This name is the same as JPI$_TERMINAL unless virtual terminals are enabled, in which case JPI$_TERMINAL returns the name of the virtual terminal and JPI$_TT_PHYDEVNAM returns the name of the physical terminal. If JPI$_TERMINAL is null or if the virtual terminal is disconnected from the physical terminal, JPI$_TT_PHYDEVNAM returns a null string.

JPI$_UAF_FLAGS

Returns the UAF flags from the UAF record of the user who owns the process. The flags are returned as a longword bit vector. For a list of the symbolic names of these flags, see the UAI$_FLAGS item code under the $GETUAI system service.

JPI$_UIC

Returns the UIC of the process in the standard longword format.

JPI$_USERNAME

Returns the user name of the process as a 12-byte string. If the name is less than 12 bytes, $GETJPI fills out the 12 bytes with trailing blanks and always returns 12 as the string length.

JPI$_VIRTPEAK

Returns the peak virtual address size---in pages for VAX or pagelets for Alpha or I64---of the process.

On VAX systems, the value returned is a longword integer. On Alpha and I64 systems, the value returned requires a quadword of storage. If the buffer size supplied is not equal to 8 bytes, and the virtual peak exceeds the maximum value that can be represented in a longword, $GETJPI returns the largest positive 32-bit integer: 2147483647.

JPI$_VOLUMES

Returns the number of volumes that the process currently has mounted, which is a longword integer value.

JPI$_VP_CONSUMER

On VAX systems, returns a byte, the low-order bit of which, when set, indicates that the process is a vector consumer.

JPI$_VP_CPUTIM

On VAX systems, returns an unsigned longword that contains the total amount of time the process has accumulated as a vector consumer.

JPI$_WSAUTH

Returns the maximum authorized working set size, in pages (on VAX systems) or pagelets (on Alpha and I64 systems), of the process. This is a longword integer value.

JPI$_WSAUTHEXT

Returns, in pages (on VAX systems) or pagelets (on Alpha and I64 systems), the maximum authorized working set extent of the process as a longword integer value.

JPI$_WSEXTENT

Returns, in pages (on VAX systems) or pagelets (on Alpha and I64 systems), the current working set extent of the process as a longword integer value.

JPI$_WSPEAK

Returns, in pages (on VAX systems) or pagelets (on Alpha and I64 systems), the peak working set size of the process as a longword integer value.

JPI$_WSQUOTA

Returns, in pages (on VAX systems) or pagelets (on Alpha and I64 systems), the working set size quota of the process as a longword integer value.

JPI$_WSSIZE

Returns, in pages (on VAX systems) or pagelets (on Alpha and I64 systems), the current working set limit of the process as a longword integer value.

Description

The Get Job/Process Information service returns information about one or more processes on the system or across the cluster. Using $GETJPI with $PROCESS_SCAN, you can perform selective or clusterwide searches.

Getting information about another process is an asynchronous operation because the information might be contained in the virtual address space of the target process, and that process might be running at a lower priority, be outswapped, or be suspended in a miscellaneous or resource wait state. To allow your program to overlap other functions with the time needed to access the data in the other process, $GETJPI returns immediately after it has queued its information-gathering request to the other process. You can use the JPI$_GETJPI item code to control the processing of the $GETJPI call and the information-gathering interprocess request itself.

When performing an asynchronous system service call such as $GETJPI, the specifications of the iosb argument and a unique event flag are used in conjunction with mechanisms such as the $SYNCH system service to synchronize the final completion of the asynchronous system service call.

Required Access or Privileges

The calling process must have GROUP privilege to obtain information about other processes with the same group UIC number as the calling process. The calling process must have WORLD privilege to obtain information about other processes on the system that are not in the same group as the calling process.

Using prcnam and pidadr Arguments

Most process control services accept the prcnam or the pidadr argument or both. However, you should identify a process by its process identification number for the following reasons:

If you specify the PID address, the service uses the PID address. If you specify the process name without a PID address, the service uses the process name. If you specify both---the process name and PID address---it uses the PID address unless the contents of the PID is 0. In that case, the service uses the process name. If you specify a PID address of 0 without a process name, then the service is performed for the calling process.

If you specify neither the process name argument nor the process identification number argument, the service is performed for the calling process. If the PID address is specified, the service returns the PID of the target process in it. Table SYS-44 summarizes the possible combinations of these arguments and explains how the services interpret them.

Table SYS-44 Process Identification
Process
Name
Specified?
PID
Address
Specified?
Contents of
PID
Resultant
Action
by Services
No No -- The process identification of the calling process is used, but is not returned.
No Yes 0 The process identification of the calling process is used and returned.
No Yes PID The process identification is used and returned.
Yes No -- The process name is used. The process identification is not returned.
Yes Yes 0 The process name is used and the process identification is returned.
Yes Yes PID The process identification is used and returned; the process name is ignored.

Required Quota

None

Related Services

$GETJPIW, $HIBER, $PROCESS_SCAN, $RESUME, $SYNCH


Condition Values Returned

SS$_NORMAL The service completed successfully.
SS$_ACCVIO The item list cannot be read by the caller, or the buffer length or buffer cannot be written by the caller.
SS$_BADPARAM The item list contains an invalid identifier. Or, an item list containing both 32-bit and 64-bit item list entries was found.
SS$_INCOMPAT The remote node is running an incompatible version of the operating system.
SS$_IVLOGNAM The process name string has a length of 0 or has more than 15 characters.
SS$_NOMOREPROC In a wildcard operation, $GETJPI found no more processes.
SS$_NOMORETHREAD The search for kernel threads within a process is complete. This condition value is returned by $GETJPIW if you set the JPI$M_THREAD bit in JPI$_GETJPI_CONTROL_FLAGS.
SS$_NONEXPR The specified process does not exist, or an invalid process identification was specified.
SS$_NOPRIV The process does not have the privilege to obtain information about the specified process.
SS$_NOSUCHNODE The specified node is not currently a member of the cluster.
SS$_REMRSRC The remote node has insufficient resources to respond to the request. (Bring this error to the attention of your system manager.)
SS$_SUSPENDED The specified process is suspended or in a miscellaneous wait state, and the requested information cannot be obtained.
SS$_UNREACHABLE The remote node is a member of the cluster but is not accepting requests. This is normal for a brief period early in the system boot process.

Condition Values Returned in the I/O Status Block

1
Same as those returned in R0.


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