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| Document revision date: 30 March 2001 | |
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Enables or disables the delivery of asynchronous system traps (ASTs) for the access mode from which the service call was issued.
SYS$SETAST enbflg
int sys$setast (char enbflg);
enbflg
OpenVMS usage: boolean type: byte (unsigned) access: read only mechanism: by value
Value specifying whether ASTs are to be enabled. The enbflg argument is a byte containing this value. The value 1 enables AST delivery for the calling access mode; the value 0 disables AST delivery.
The Set AST Enable service enables or disables the delivery of ASTs for the access mode from which the service call was issued.When an image is executing in user mode, ASTs are always enabled for more privileged access modes. If ASTs are disabled for a more privileged access mode, the operating system cannot deliver ASTs for less privileged access modes until ASTs are enabled once again for the more privileged access mode. Therefore, a process that has disabled ASTs for a more privileged access mode must reenable ASTs for that mode before returning to a less privileged access mode.
None
$DCLAST, $SETPRA
SS$_WASCLR The service completed successfully. AST delivery was previously disabled for the calling access mode. SS$_WASSET The service completed successfully. AST delivery was previously enabled for the calling access mode.
Establishes a request for notification when an OpenVMS Cluster configuration event occurs.
SYS$SETCLUEVT event ,astadr ,[astprm] ,[acmode] ,[handle]
int sys$setcluevt (unsigned int event, void (*astadr)(__unknown_params), int astprm, unsigned int acmode, struct _generic_64 *handle);
event
OpenVMS usage: event_code type: longword (unsigned) access: read only mechanism: by value
Event code indicating the type of cluster configuration event for which an AST is to be delivered. The event argument is a value indicating which type of event is of interest.Each event type has a symbolic name. The $CLUEVTDEF macro defines the following symbolic names:
Symbolic Name Description CLUEVT$C_ADD One or more OpenVMS nodes have been added to the OpenVMS Cluster system. CLUEVT$C_REMOVE One or more OpenVMS nodes have been removed from the OpenVMS Cluster system. astadr
OpenVMS usage: ast_procedure type: procedure value access: call without stack unwinding mechanism: by reference
Notification AST routine to receive control after a change in OpenVMS Cluster configuration occurs.astprm
OpenVMS usage: user_arg type: longword (unsigned) access: read only mechanism: by value
Optional AST parameter to be passed to the AST service routine. The astprm argument is a longword value containing the AST parameter.acmode
OpenVMS usage: access_mode type: longword (unsigned) access: read only mechanism: by value
Optional access mode at which the configuration event AST is to execute. The acmode argument is a longword containing the access mode.Each access mode has a symbolic name. The $PSLDEF macro defines the following symbols for the four access modes:
Symbol Access Mode PSL$C_KERNEL Kernel PSL$C_EXEC Executive PSL$C_SUPER Supervisor PSL$C_USER User The value of the access mode must not be more privileged than the access mode of the caller.
handle
OpenVMS usage: identifier type: quadword (unsigned) access: write only mechanism: by reference
Optional identifier to receive a value that uniquely identifies this AST request. $SETCLUEVT sets this handle to a unique value so that it can later be used to identify the request in the $CLRCLUEVT and $TSTCLUEVT services.
The Set Cluster Event service establishes a request for notification when a cluster configuration event occurs. The service establishes only one AST notification for a configuration event. To receive AST notification for all cluster configuration events, the $SETCLUEVT service must be reissued within the notification AST routine.The service will verify that the input parameters specify a valid request, allocate appropriate data structures to hold the request, and enqueue the request for notification.
You must specify an event type and an AST address. You can specify an AST parameter, the access mode, and an address into which to place the handle of this request.
Errors will be returned in the following cases:
- If quotas are exceeded, an error identifying the specific quota will be returned. It is important to note that this routine will return an error and will not retry an attempt to get quota if quota is exhausted on the first attempt. See the Condition Values Returned section for types of errors that can be returned.
- If the astadr argument is omitted, SS$_BADPARAM will be returned.
- If the event argument is omitted or incorrectly specified, SS$_BADPARAM will be returned.
- If the access mode parameter is more privileged than the mode of the caller, the mode of the caller will be used.
- If specified, the handle argument must be readable and writable from the mode of the caller. SS$_ACCVIO is returned if this is not the case.
None
None
$CLRCLUEVT, $TSTCLUEVT
SS$_NORMAL The service completed successfully. SS$_ACCVIO Unable to process parameters for improper use. SS$_BADPARAM The event was improperly specified. SS$_EXASTLM The process exceeded its quota for outstanding AST requests. SS$_INSFMEM The system dynamic memory is insufficient to complete the service.
Allows you to read and change the default directory string for the process.
SYS$SETDDIR [new-dir-addr] ,[length-addr] ,[cur-dir-addr]
int sys$setddir (void *newdiraddr, unsigned short int *lengthaddr, void *curdiraddr);
new-dir-addr
OpenVMS usage: char_string type: character-coded text string access: read only mechanism: by descriptor--fixed-length string descriptor
A descriptor of the new default directory. The new-dir-addr argument is the address of the descriptor that points to the buffer containing the new directory specification that RMS will use to set the new process-default directory. If the default directory is not to be changed, the value of the new-dir-addr argument should be 0.length-addr
OpenVMS usage: word_unsigned type: word (unsigned) access: write only mechanism: by reference
A word that is to receive the length of the current default directory. The length-addr argument is the address of the word that will receive the length. If you do not want this value returned, specify the value 0.cur-dir-addr
OpenVMS usage: char_string type: character-coded text string access: write only mechanism: by descriptor--fixed-length string descriptor
A descriptor of a buffer that is to receive the current default directory string. The cur-dir-addr argument is the address of the descriptor that points to the buffer area that is to receive the current directory string.
The Set Default Directory service allows you to read and change the default directory string for the process. You should restore the previous default directory string to its original state unless you want the changed default directory string to last beyond the exit of your image. The new directory name string is checked for correct syntax.There is no predefined macro of the form $SETDDIR_G or $SETDDIR_S to call this service.
On Alpha systems, the Set Default Directory service attempts to replace the default directory string with a DID abbreviation if the length of the resulting default directory exceeds 255 characters. If this happens, then in addition to the normal syntax check, the entire path to that specification, including the device, is verified and must exist for the call to succeed.
None
None
$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, $SNDOPR
RMS$_NORMAL The service completed successfully. RMS$_DIR The directory name contains an error. RMS$_IAL The argument list is invalid.
Allows you to read and write the default file protection for the process.
SYS$SETDFPROT [new-def-prot-addr] ,[cur-def-prot-addr]
int sys$setdfprot (unsigned short int *newdefprotaddr, unsigned short int *curdefprotaddr);
new-def-prot-addr
OpenVMS usage: file_protection type: word (unsigned) access: read only mechanism: by reference
A word that specifies the new default file protection specification. The new-def-prot-addr argument is the address of the word that specifies the desired protection. If you do not want the process-default file protection to be changed, specify the value 0.cur-def-prot-addr
OpenVMS usage: file_protection type: word (unsigned) access: write only mechanism: by reference
A word that is to receive the current default file protection specification. The cur-def-prot-addr argument is the address of the word that receives the current process-default protection. If you do not want the current default file protection, specify the value 0.
The Set Default File Protection service allows you to read and write the default file protection for the process. You should restore the old default file protection specification unless you want the changed default to last beyond the exit of your image.There is no predefined macro of the form $SETDEFPROT_G or $SETDEFPROT_S to call this service.
None
None
$ALLOC, $ASSIGN, $BRKTHRU, $BRKTHRUW, $CANCEL, $CREMBX, $DALLOC, $DASSGN, $DELMBX, $DEVICE_SCAN, $DISMOU, $GETDVI, $GETDVIW, $GETMSG, $GETQUI, $GETQUIW, $GET_SECURITY, $INIT_VOL, $MOUNT, $PUTMSG, $QIO, $QIOW, $SET_SECURITY, $SNDERR, $SNDJBC, $SNDJBCW, $SNDOPR
RMS$_NORMAL The service completed successfully. RMS$_IAL The argument list is invalid.
Sets an event flag in a local or common event flag cluster. The condition value returned by $SETEF indicates whether the specified flag was previously set or clear. After the event flag is set, processes waiting for the event flag to be set resume execution.
SYS$SETEF efn
int sys$setef (unsigned int efn);
efn
OpenVMS usage: ef_number type: longword (unsigned) access: read only mechanism: by value
Number of the event flag to be set. The efn argument is a longword containing this number; however, $SETEF uses only the low-order byte.Two local event flag clusters are local to the process: cluster 0 and cluster 1. Cluster 0 contains event flag numbers 0 to 31, and cluster 1 contains event flag numbers 32 to 63.
There are two common event flag clusters: cluster 2 and cluster 3. Cluster 2 contains event flag numbers 64 to 95, and cluster 3 contains event flag numbers 96 to 127.
SS$_WASCLR The service completed successfully. The specified event flag was previously 0. SS$_WASSET The service completed successfully. The specified event flag was previously 1. SS$_ILLEFC You specified an illegal event flag number. SS$_UNASEFC The process is not associated with the cluster containing the specified event flag.
Assigns a condition handler address to the primary, secondary, or last chance exception vectors, or removes a previously assigned handler address from any of these three vectors.
SYS$SETEXV [vector] ,[addres] ,[acmode] ,[prvhnd]
int sys$setexv (unsigned int vector, int (*addres)(__unknown_params), unsigned int acmode, void *(*(prvhnd)));
vector
OpenVMS usage: longword_unsigned type: longword (unsigned) access: read only mechanism: by value
Vector for which a condition handler is to be established or removed. The vector argument is a longword value. The value 0 (the default) specifies the primary exception vector; the value 1, the secondary vector; and the value 2, the last chance exception vector.addres
OpenVMS usage: procedure type: procedure value access: call without stack unwinding mechanism: by reference
Condition handler address to be established for the exception vector specified by the vector argument. The addres argument is a longword value containing the address of the condition handler routine.If you do not specify addres or specify it as the value 0, the condition handler address already established for the specified vector is removed; that is, the contents of the longword vector is set to 0.
acmode
OpenVMS usage: access_mode type: longword (unsigned) access: read only mechanism: by value
Access mode for which the exception vector is to be modified. The acmode argument is a longword containing the access mode. The $PSLDEF macro defines symbols for the four access modes.The most privileged access mode used is the access mode of the caller. Exception vectors for access modes more privileged than the caller's access mode cannot be modified.
prvhnd
OpenVMS usage: procedure value type: longword (unsigned) access: write only mechanism: by reference
Previous condition handler address contained by the specified exception vector. The prvhnd argument is the address of a longword into which $SETEXV writes the handler's procedure value.
The Set Exception Vector service (1) assigns a condition handler address to the primary, secondary, or last chance exception vectors or (2) removes a previously assigned handler address from any of these three vectors. A process cannot modify a vector associated with a more privileged access mode.The operating system provides two different methods for establishing condition handlers:
- Using the call stack associated with each access mode. Each call frame includes a longword to contain the address of a condition handler associated with that frame.
- On VAX systems, the RTL routine LIB$ESTABLISH establishes a condition handler; the RTL routine LIB$REVERT removes a handler.
- Using the software exception vectors (by using $SETEXV) associated with each access mode. These vectors are set aside in the control region (P1 space) of the process.
The modular properties associated with the first method do not apply to the second. The software exception vectors are intended primarily for performance monitors and debuggers. For example, the primary exception vector and the last chance exception vector are used by the OpenVMS Debugger for user mode access, and DCL uses the last chance exception vector for supervisor mode access.
User mode exception vectors are canceled at image exit.
None
None
$DCLCMH, $SETSFM, $UNWIND
SS$_NORMAL The service completed successfully. SS$_ACCVIO The longword to receive the previous contents of the vector cannot be written by the caller.
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