dg_csfctl(2)                   DG/UX R4.11MU05                  dg_csfctl(2)


NAME
       dgcsfctl - control class scheduling on the current node

SYNOPSIS
       #include <sys/dgcsfctl.h>

       int dgcsfctl (unsigned int cmd, void *arg);

   where:
       cmd       Specifies a particular operation for dgcsfctl to perform.

       arg       The address of an information packet by cmd.

DESCRIPTION
       Use dgcsfctl to modify/enable/disable node class scheduling on the
       current node. The class scheduling operation is determined by cmd.
       Additional information needed to support the command is pointed to by
       arg.  Operations done on one node will not affect any other nodes.
       The various commands and and the types of their corresponding
       arguments packets are described in <sys/dgcsfctl.h>.

       The commands you can specify are as follows:

        DG_CSFCTL_UPDATE_CIB
               Use this command to update the node's class scheduling
               database. Arg will point to a dgcsfcontrolblocktype (see
               <sys/dgcsfctl.h>).  The version of the new database,
               specified in the cibversion field of the
               dgcsfcontrolblocktype structure, must be the successive
               value of the current database version [see dgcsfinfo(2) to
               get the current database version].

        DG_CSFCTL_ENABLE_NODE_CSF
               Use this command to enable class scheduling. Arg is not used.

        DG_CSFCTL_DISABLE_NODE_CSF
               Use this command to disable class scheduling. Arg is not
               used.

        DG_CSFCTL_REHASH
               Use this command to rehash the class scheduling database.
               Arg is not used.  Rehashing the database will re-evaluate the
               program pathname component for any class instance.  The
               pathname is converted to a unique file identifier that allows
               any path to the program to result in the same unique file
               identifier.  If the program is modified or replaced, the
               unique file identifier will change and cause any instances
               that contained the old unique file identifier to become stale
               (the replaced/modified program will no longer satisfy the
               pathname component of the instance).  Rehashing the database
               will update the unique file identifier to its latest value.

        DG_CSFCTL_RESYNC
               Use this command to remove all class scheduling classes and
               instances.  Arg points to an unsigned integer to
               resynchronize the class scheduling database version number
               to.

        DG_CSFCTL_SET_GMT_OFFSET
               Use this command to set the Greenwich Mean Time offset used
               to evaluate class constraints.  Arg points to a signed
               integer that represents the number of seconds to adjust the
               system GMT by when evaluating class constraints [see
               dgcsfinfo(2) to get the current GMT offset].

        DG_CSFCTL_SET_LOCAL_EXEC_DEPTH
               Use this command to set the local execution depth for the
               current process.  Arg points to an unsigned integer that will
               be the new local execution depth.  A local execution depth
               greater than one will prevent class scheduling from
               redirecting an exec(2) done by the process to another node.
               The local execution depth of a process is decremented by one
               (provided it is greater than zero) each time the process does
               a successful exec(2).  A new process inherits its local
               execution depth from its parent at fork(1) time [see
               dgprocessinfo(2) to get the local execution depth for a
               process].

ACCESS CONTROL
       Any user may execute the DGCSFCTLSETLOCALEXECDEPTH command.

       To do the DGCSFCTLUPDATECIB, DGCSFCTLENABLENODECSF,
       DGCSFCTLDISABLENODECSF, DGCSFCTLREHASH, DGCSFCTLRESYNC, or
       DGCSFCTLSETGMTOFFSET commands you must have appropriate
       privilege.  On a generic DG/UX system, appropriate privilege is
       granted by having an effective UID of 0 (root). See the
       appropriateprivilege(5) man page for more information.

       On a system with DG/UX information security, appropriate privilege is
       granted by having one or more specific capabilities enabled in the
       effective capability set of the user.  See capdefaults(5) for the
       default capabilities for this command.

RETURN VALUE
       0      Successful completion.

       -1     An error occurred.  errno is set to indicate the error.

DIAGNOSTICS
       Errno may be set to one of the following error codes:

       EPERM   The caller does not have appropriate privilege.

       EINVAL  Cmd is not one of the valid commands.

       EINVAL  For the DGCSFCTLUPDATECIB command a component of the
               packet pointed to by arg is invalid.

       ENOMEM  There was insufficient kernel memory to execute cmd.

       EFAULT  Arg or a pointer in the packet points to an invalid address.

       EAGAIN  The node could not be enabled because resources are
               temporarily unavailable.

       ENOPKG  Clusters is not configured for the node.

SEE ALSO
       dgcsfinfo(2), dgcsfclassinfo(2), dgcsfclassinfo(2),
       dgprocessinfo(2), exec(2), fork(2).


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