SYS$ - SYS$ Interface Routines

Overview

VX/SYS$ provides a call-compatible implementation of OpenVMS system service calls for x86 and ARM Linux. It ensures that OpenVMS applications can perform system-level operations such as resource allocation, privilege management, process control, and interprocess communication while maintaining execution compatibility on Linux.

Key Features

• Fully compatible with OpenVMS SYS$ APIs.

• Supports device and resource management, process creation, privilege checking, and system messaging.

• Allows seamless migration of OpenVMS applications that rely on SYS$ routines.

• Integrates with VX/RT to provide full OpenVMS system service capabilities on x86 and ARM Linux.

• Maintains OpenVMS system behavior, ensuring applications execute as expected without modification.

VX/SYS$ Callable Routines

SYS$ API	Function
SYS$ABORT_RU	Aborts a recovery unit transaction
SYS$ABORT_TRANSW	Aborts a transaction with wait synchronization
SYS$ADJWSL	Adjust working set limit
SYS$ALLOC	Allocate a device or resource
SYS$ASCEFC	Convert ASCII to event flag
SYS$ASCTIM	Convert time to ASCII format
SYS$ASCTOID	Convert ASCII to ID format
SYS$ASSIGN	Assign device to logical name
SYS$BINTIM	Convert binary to time format
SYS$BINTIM_UNIX	Converts Unix timestamp to binary format
SYS$BRDCST	Broadcast a system message
SYS$BRKTHRU	Send break-through message
SYS$BRKTHRUW	Break-through message with wait
SYS$CANCEL	Cancel I/O request
SYS$CANEXH	Cancel exception handler
SYS$CANTIM	Cancel a timer request
SYS$CANWAK	Cancel wake request
SYS$CHECK_PRIVILEGE	Verifies if a process has a specific privilege
SYS$CHECK_PRIVILEGEW	Checks for privileges with a wait option
SYS$CLOSE	Close a device or file
SYS$CLREF	Clear reference bit
SYS$CMEXEC	Execute in executive mode
SYS$CONNECT	Connect to a device
SYS$COPY	Copies a file or resource within the system
SYS$CREATE	Create an object or resource
SYS$CREATE_REGION_64	Creates a 64-bit memory region
SYS$CREATE_UID	Generates a unique identifier
SYS$CRELNM	Create a logical name
SYS$CRELNT	Create a logical name table
SYS$CRELOG	Create a login entry
SYS$CREMBX	Create a mailbox
SYS$CREPRC	Create a process
SYS$CRETVA	Create a virtual address
SYS$CRETVA_64	Creates a 64-bit virtual address space
SYS$CRMPSC	Create a memory section
SYS$CRMPSC_GFILE_64	Creates and maps a 64-bit global file section
SYS$DACEFC	Deallocate event flag cluster
SYS$DALLOC	Deallocates a previously allocated resource
SYS$DASSGN	Deassigns a system resource
SYS$DCLAST	Declares the last system call in a sequence
SYS$DCLEXH	Declares an exception handling routine
SYS$DELETE	Deletes a file or system object
SYS$DELETE_REGION_64	Deletes a 64-bit memory region
SYS$DELLNM	Deletes a logical name from the system
SYS$DELLOG	Deletes a logical definition
SYS$DELMBX	Deletes a mailbox device
SYS$DELPRC	Deletes a process from the system
SYS$DELTVA	Deletes a virtual address space allocation
SYS$DELTVA_64	Deletes a 64-bit virtual address allocation
SYS$DEQ	Dequeues a lock request
SYS$DEQW	Dequeues a lock request and waits for completion
SYS$DGBLSC	Deletes a global section
SYS$DISCONNECT	Disconnects a process from a session
SYS$DISMOU	Dismounts a disk volume
SYS$DISPLAY	Displays system or process information
SYS$DLCEFC	Declares an exception flag condition
SYS$END_RU	Ends a recovery unit transaction
SYS$END_TRANSW	Ends a transaction with wait synchronization
SYS$ENQ	Enqueue a lock request
SYS$ENQW	Enqueue lock with wait
SYS$ERASE	Erase a file
SYS$EXIT	Exit current process
SYS$EXPREG	Expand register space
SYS$EXTEND	Extend file or region
SYS$FAO	Format and output a string
SYS$FAOL	Format output with logging
SYS$FILESCAN	Scan file for attributes
SYS$FIND	Find a file or record
SYS$FIND_HELD	Find held resource
SYS$FLUSH	Flush buffers
SYS$FORCEX	Force exit of process
SYS$FREE	Free allocated resource
SYS$FREELIST	Frees allocated list structures
SYS$GET	Retrieve system information
SYS$GET_REGION_INFO	Retrieves information about memory regions
SYS$GET_SECURITY	Retrieves security attributes of an object
SYS$GETCHN	Get channel number
SYS$GETDVI	Get device information
SYS$GETDVIW	Get device info with wait
SYS$GETJPI	Get job/process info
SYS$GETJPIW	Get job info with wait
SYS$GETLKI	Get lock information
SYS$GETLKIW	Get lock info with wait
SYS$GETMSG	Retrieve system message
SYS$GETQUI	Get queue information
SYS$GETQUIW	Get queue info with wait
SYS$GETRMI	Retrieves resource management information
SYS$GETSYI	Get system information
SYS$GETSYIW	Get system info with wait
SYS$GETTIM	Retrieve system time
SYS$GETUAI	Get user account info
SYS$HIBER	Put process in hibernation
SYS$IDTOASC	Convert ID to ASCII
SYS$LCKPAG	Lock page in memory
SYS$MGBLSC	Manage global section
SYS$MGBLSC_64	Manages a 64-bit global section
SYS$MOUNT	Mount a disk or volume
SYS$NUMTIM	Convert number to time
SYS$OPEN	Open a file or device
SYS$PARSE	Parse file specification
SYS$PROCESS_SCAN	Scans and retrieves process information
SYS$PUT	Write system data
SYS$PUTMSG	Send a system message
SYS$QIO	Queue an I/O request
SYS$QIOW	Queue I/O with wait
SYS$READ	Read data from device
SYS$READEF	Read event flag
SYS$RELEASE	Release a resource
SYS$RENAME	Rename a file
SYS$RESUME	Resume a process
SYS$REWIND	Rewind a device
SYS$RUNDOWN	Handles process rundown operations
SYS$SCHDWK	Schedule a work request
SYS$SEARCH	Search for a file
SYS$SELECT_CHAN	Select I/O channel
SYS$SET_RESOURCE_DOMAIN	Sets the resource domain for a process
SYS$SET_SECURITY	Sets security attributes for an object
SYS$SETAST	Set AST state
SYS$SETDDIR	Set default directory
SYS$SETDFPROT	Sets default protection attributes
SYS$SETEF	Set event flag
SYS$SETIME	Set system time
SYS$SETIMR	Set interval timer
SYS$SETPRI	Set process priority
SYS$SETPRN	Set print attributes
SYS$SETPRV	Set process privileges
SYS$SETRWM	Set read/write mode
SYS$SETSFM	Set file mask
SYS$SNDJBC	Send job control message
SYS$SNDJBCW	Send job control with wait
SYS$SNDOPR	Send message to operator
SYS$SNDSMB	Send message to system mailbox
SYS$START_RU	Starts a recovery unit transaction
SYS$START_TRANSW	Starts a transaction with wait synchronization
SYS$SUSPND	Suspend process execution
SYS$SYNCH	Synchronizes a process with another operation
SYS$TRNLNM	Translates a logical name
SYS$TRNLOG	Translates system log file entries
SYS$TRUNCATE	Truncates a file or memory object
SYS$UNWIND	Unwinds the call stack after an exception
SYS$UPDATE	Updates a file or system resource
SYS$UPDSEC	Updates security settings for an object
SYS$UPDSEC_64	Updates 64-bit security settings
SYS$UPDSEC_64W	Updates 64-bit security settings with wait
SYS$UPDSECW	Updates security settings with wait synchronization
SYS$WAIT	Suspends execution until an event occurs
SYS$WAITFR	Waits for an event flag to be set
SYS$WAKE	Wakes up a suspended process
SYS$WFLAND	Waits for a logical AND condition on flags
SYS$WFLOR	Waits for a logical OR condition on flags
SYS$WRITE	Writes data to a file or device

Why Use VX/SYS$?

• Preserves OpenVMS system service logic, enabling direct porting of applications.

• Provides full compatibility with OpenVMS SYS$ functions, ensuring seamless execution of system operations on Linux.

• Supports key OpenVMS system service tasks, including device assignment, time conversion, privilege validation, and interprocess communication.

• Seamlessly integrates into the VX/RT ecosystem for OpenVMS compatibility on x86 and ARM Linux.

VX/SYS$ ensures that OpenVMS applications requiring SYS$ services can be migrated without major modifications, preserving productivity and minimizing development costs.

SYS$ - SYS$ Interface Routines

Overview

Key Features

VX/SYS$ Callable Routines

Why Use VX/SYS$?

Frequently Asked Questions

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