HP OpenVMS Systems Documentation

Enables or disables specified user privileges. The F$SETPRV function returns a list of keywords indicating user privileges; this list shows the status of the specified privileges before F$SETPRV was executed.

Your process must be authorized to set the specified privilege.

For detailed information on privilege restrictions, see the description of the $SETPRV system service in the HP OpenVMS System Services Reference Manual.

Format

F$SETPRV (priv-states)

Return Value

Argument

priv-states

Specifies a character string defining a privilege, or a list of privileges separated by commas (,).

For a list of process privileges, see the OpenVMS User's Manual.

Description

The lexical function F$SETPRV invokes the $SETPRV system service to enable or disable specified user privileges. The F$SETPRV function returns a list of keywords indicating user privileges; this list shows the status of the specified privileges before F$SETPRV was executed.

The F$SETPRV function returns keywords for your current privileges, whether or not you are authorized to change the privileges listed in the priv-states argument; however, the F$SETPRV function enables or disables only the privileges you are authorized to change.

When you run programs or execute procedures that include the F$SETPRV function, be sure that F$SETPRV restores your process to its proper privileged state. For additional information, see the examples that follow.

Examples

$ OLDPRIV = F$SETPRV("OPER,NOTMPMBX")
$ SHOW SYMBOL OLDPRIV
  OLDPRIV = "NOOPER,TMPMBX"
      

In this example, the process is authorized to change the OPER (operator) and TMPMBX (temporary mailbox) privileges. The F$SETPRV function enables the OPER privilege and disables the TMPMBX privilege. In addition, the F$SETPRV function returns the keywords NOOPER and TMPMBX, showing the state of these privileges before they were changed.

You must place quotation marks (" ") around the list of privilege keywords because it is a string literal.

$ SHOW PROCESS/PRIVILEGE
 
05-JUN-2001 15:55:09.60   RTA1:              User: HELRIEGEL 
 
Process privileges: 
 
Process rights identifiers: 
 INTERACTIVE 
 LOCAL 
$ NEWPRIVS = F$SETPRV("ALL, NOOPER")
$ SHOW SYMBOL NEWPRIVS
  NEWPRIVS = "NOCMKRNL,NOCMEXEC,NOSYSNAM,NOGRPNAM,NOALLSPOOL, 
      NOIMPERSONATE,NODIAGNOSE,NOLOG_IO,NOGROUP,NOACNT,NOPRMCEB, 
      NOPRMMBX,NOPSWAPM,NOALTPRI,NOSETPRV,NOTMPMBX,NOWORLD,NOMOUNT, 
      NOOPER,NOEXQUOTA,NONETMBX,NOVOLPRO,NOPHY_IO,NOBUGCHK,NOPRMGBL, 
      NOSYSGBL,NOPFNMAP,NOSHMEM,NOSYSPRV,NOBYPASS,NOSYSLCK,NOSHARE, 
      NOUPGRADE,NODOWNGRADE,NOGRPPRV,NOREADALL,NOSECURITY,OPER" 
$ SHOW PROCESS/PRIVILEGE
 
05-JUN-2001 10:21:18.32   User: INAZU      Process ID: 00000F24 
                          Node: TOKNOW     Process name: "_FTA23:" 
 
Authorized privileges: 
 NETMBX    SETPRV    SYSPRV    TMPMBX 
 
Process privileges: 
 ACNT                 may suppress accounting messages 
 ALLSPOOL             may allocate spooled device 
 ALTPRI               may set any priority value 
 AUDIT                may direct audit to system security audit log 
 BUGCHK               may make bug check log entries 
 BYPASS               may bypass all object access controls 
 CMEXEC               may change mode to exec 
 CMKRNL               may change mode to kernel 
 DIAGNOSE             may diagnose devices 
 DOWNGRADE            may downgrade object secrecy 
 EXQUOTA              may exceed disk quota 
 GROUP                may affect other processes in same group 
 GRPNAM               may insert in group logical name table 
 GRPPRV               may access group objects via system protection 
 IMPERSONATE          may impersonate another user 
 IMPORT               may set classification for unlabeled object 
 LOG_IO               may do logical i/o 
 MOUNT                may execute mount acp function 
 NETMBX               may create network device 
 OPER                 may perform operator functions 
 PFNMAP               may map to specific physical pages 
 PHY_IO               may do physical i/o 
 PRMCEB               may create permanent common event clusters 
 PRMGBL               may create permanent global sections 
 PRMMBX               may create permanent mailbox 
 PSWAPM               may change process swap mode 
 READALL              may read anything as the owner 
 SECURITY             may perform security administration functions 
 SETPRV               may set any privilege bit 
 SHARE                may assign channels to non-shared devices 
 SHMEM                may create/delete objects in shared memory 
 SYSGBL               may create system wide global sections 
 SYSLCK               may lock system wide resources 
 SYSNAM               may insert in system logical name table 
 SYSPRV               may access objects via system protection 
 TMPMBX               may create temporary mailbox 
 UPGRADE              may upgrade object integrity 
 VOLPRO               may override volume protection 
 WORLD                may affect other processes in the world 
 
Process rights: 
 INTERACTIVE 
 LOCAL 
 
System rights: 
 SYS$NODE_TOKNOW 
 
$ NEWPRIVS = F$SETPRV(NEWPRIVS)
$ SHOW PROCESS/PRIVILEGE
 
05-JUN-2001 16:05:07.23   RTA1:              User: JERROM        
 
Process privileges: 
 OPER                 operator privilege            
 
Process rights identifiers: 
 INTERACTIVE 
 LOCAL 
      

In this example, the DCL command SHOW PROCESS/PRIVILEGE is used to determine the current process privileges. Note that the process has no privileges enabled.

The F$SETPRV function is then used to process the ALL keyword and enable all privileges recording the previous state of each privilege in the symbol NEWPRIVS. Next, F$SETPRV processes the NOOPER keyword and disables the OPER (operator) privilege, recording the previous state of OPER in NEWPRIVS. Note that the OPER privilege appears in the returned string twice: first as NOOPER and then as OPER.

Entering the command SHOW PROCESS/PRIVILEGE now shows that the current process has all privileges enabled except OPER.

If the returned string is used as the parameter to F$SETPRV, the process has the OPER privilege enabled. This occurs because the OPER command was present twice in the symbol NEWPRIVS. As a result, F$SETPRV looked at the first keyword NOOPER and disabled the privilege. Finally, after processing several other keywords in the NEWPRIVS string, the OPER keyword is presented, allowing F$SETPRV to enable the OPER privilege.

If you are using the ALL or NOALL keywords to save your current privilege environment, HP recommends that you perform the following procedure to modify the process for a command procedure:

$ CURRENT_PRIVS = F$SETPRV("ALL") $ TEMP = F$SETPRV("NOOPER")

If you use this procedure, you can then specify the following command statement at the end of your command procedure so that the original privilege environment is restored:

$ TEMP = F$SETPRV(CURRENT_PRIVS)

$ SAVPRIV = F$SETPRV("NOGROUP")
$ SHOW SYMBOL SAVPRIV
  SAVPRIV = "GROUP"
$ TEST = F$PRIVILEGE("GROUP")
$ SHOW SYMBOL TEST
  TEST = "TRUE"
      

In this example, the process is not authorized to change the GROUP privilege; however, the F$SETPRV function still returns the current setting for the GROUP privilege.

The F$PRIVILEGE function is used to see whether the process has GROUP privilege. The return string, TRUE, indicates that the process has GROUP privilege, even though the F$SETPRV function attempted to disable the privilege.