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  man pages->Tru64 Unix man pages -> cfg_query (9r)              



NAME    [Toc]    [Back]

       cfg_query  -  General:  Determines  the values of selected
       subsystem attributes

SYNOPSIS    [Toc]    [Back]

       #include <sys/sysconfig.h> ); cfg_status_t cfg_query(
               char *subsys,
               cfg_attr_t *attributes,
               uint nattributes );

ARGUMENTS    [Toc]    [Back]

       Specifies the name of the subsystem to be  queried.   Contains
  information, such as attribute name, about the list
       of attributes being queried. The  array  must  have  (nattributes
  +  1)  cfg_attr_t  structures with the attribute
       name of the last one being set to a null  string.   Specifies
  the  number of attributes in the attributes argument
       being queried.

DESCRIPTION    [Toc]    [Back]

       The cfg_query( ) routine obtains information about a  list
       of  subsystem attributes. You can obtain information about
       one or more attributes. When your  application  calls  the
       cfg_query(  )  routine, it passes the subsystem name and a
       list of attribute names to the system.  The  system  reads
       this  information, determines the validity of the information
 about the named attributes, and returns the attribute
       value and a success status or an error status.

       When  your  application calls the cfg_query( ) routine, it
       passes a list of attribute names. The  application  passes
       this  information  in  an  array  of  structures  of  type
       cfg_attr_t. For information about this structure, see  the
       cfg_subsys_query(3) reference page.

RETURN VALUES    [Toc]    [Back]

       This routine returns 32-bit status values composed of subsystem
 status and framework status segments. The upper  16
       bits  is  the subsystem status (CFG_STATUS_SUBSYS) and the
       lower 16 bits is the frame status (CFG_STATUS_FRAME).  The
       return values are organized as follows:

       [Upper subsystem 16 bits][Lower framework 16 bits]

       The  subsystem  status is returned by the subsystem's configure
 routine and can be any error in errno.h. The framework
  status  is  returned by the configuration framework;
       the possible values are defined  in  <sys/sysconfig.h>  as
       CFG_FRAME_Exxx.  A  successful  operation has ESUCCESS (0)
       returned in both status segments.

       See the cfg_errno(9r) and  errno(2)  reference  pages  for
       more details about error numbers and status.

EXAMPLE    [Toc]    [Back]

       A  subsystem may be queried using the cfg_query routine as

              cfg_attr_t              attributes[2];
              cfg_status_t            retval;
              int                     i;
              int                     nattributes;

              /*   Initialize  attribute  names  for  the request

              strcpy (attributes[0].name, "maxmounts");
              attributes[0].type = CFG_ATTR_INTTYPE;
              attributes[0].attr.num.val = 30;
              nattributes = 1;
              attributes[1].name[0] = '\0';

              /*   Call the cfg_query() routine        */

              retval = cfg_query("lvm", attributes, nattributes);

              if (retval != CFG_SUCCESS)
                  print_error (retval);

              else {

                   for (i=0; i<1; i++) {
                      if (attributes[i].status  !=  CFG_ATTR_SUCCESS)
                          printf("%s:", attributes[i].name);
                          switch (attributes[i].status){
                           case CFG_ATTR_EEXISTS:
                             printf("unknown attribute\n");
                           case CFG_ATTR_EOP:
                             printf("attribute   does  not  allow
       this operation\n");
                             printf("unknown error\n");

       For extracting attribute values of error status, refer  to

SEE ALSO    [Toc]    [Back]

       Routines:      cfg_subsys_query(3),     cfg_configure(9r),
       cfg_errno(9r),   cfg_reconfigure(9r),    cfg_subsysop(9r),

       Other: errno(2),

[ Back ]
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