cfg_reconfigure man page on DigitalUNIX

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cfg_reconfigure(9r)					   cfg_reconfigure(9r)

       cfg_reconfigure - General: Reconfigures the attribute values for a ker‐
       nel subsystem

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

       Specifies the name of the subsystem to be reconfigured.	Specifies  the
       name  of	 the  array containing a list of attribute names and their new
       values. 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 whose values you are changing.

       The cfg_reconfigure( ) routine is used to modify attribute values for a
       subsystem.  The	modifications made by this routine take effect immedi‐
       ately because they are made to the in-memory  copy  of  the  subsystem.
       Neither	the  kernel  nor  the subsystem stores a copy of the modifica‐
       tions, so if the system is rebooted or the subsystem  is	 unconfigured,
       the modifications are lost. When the subsystem is again configured into
       the kernel,  the	 value	of  its	 attributes  are  retrieved  from  the
       /etc/sysconfigtab  database  and	 the subsystem code. To make permanent
       changes to attribute values, store the  new  attribute  values  in  the
       /etc/sysconfigtab  database. See the sysconfigtab(4) reference page for
       information about the database.

       When your application calls the cfg_reconfigure( ) routine, it passes a
       list  of attribute names and values. The application passes this infor‐
       mation in an array of structures of type	 cfg_attr_t.  For  information
       about this structure, see the cfg_subsys_reconfig(3) reference page.

       This  routine  returns  32-bit  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_STA‐
       TUS_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 and the  possible  values  are  defined  in
       <sys/sysconfig.h>  as  CFG_FRAME_Exxx. A successful operation has ESUC‐
       CESS (0) returned in both status segments.

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

       A  subsystem  may be reconfigured using the cfg_reconfigure kernel rou‐
       tine as follows:

	      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_reconfigure() routine	     */

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

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

	      else {

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

       Routines:   cfg_subsys_reconfig(3),  cfg_configure(9r),	cfg_errno(9r),
       cfg_query(9r), cfg_subsysop(9r), cfg_unconfigure(9r)

       Other: errno(2), sysconfigtab(4)


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