cfg_query(9r) [osf1 man page]
cfg_query(9r) cfg_query(9r) NAME
cfg_query - General: Determines the values of selected subsystem attributes SYNOPSIS
#include <sys/sysconfig.h> ); cfg_status_t cfg_query( char *subsys, cfg_attr_t *attributes, uint nattributes ); ARGUMENTS
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
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 suc- cess 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
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
A subsystem may be queried using the cfg_query routine 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] = ' '; /***************************************************/ /* 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 "); break; case CFG_ATTR_EOP: printf("attribute does not allow this operation "); break; . . . default: printf("unknown error "); break; } } } } For extracting attribute values of error status, refer to /usr/examples/cfgmgr/sample_app.c. SEE ALSO
Routines: cfg_subsys_query(3), cfg_configure(9r), cfg_errno(9r), cfg_reconfigure(9r), cfg_subsysop(9r), cfg_unconfigure(9r) Other: errno(2), cfg_query(9r)
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cfg_reconfigure(9r) cfg_reconfigure(9r) NAME
cfg_reconfigure - General: Reconfigures the attribute values for a kernel subsystem SYNOPSIS
#include <sys/sysconfig.h> ); cfg_status_t cfg_reconfigure( char *subsys, cfg_attr_t *attributes, uint nattributes ); ARGUMENTS
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. DESCRIPTION
The cfg_reconfigure( ) routine is used to modify attribute values for a subsystem. The modifications made by this routine take effect imme- diately 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 information in an array of structures of type cfg_attr_t. For information about this structure, see the cfg_subsys_reconfig(3) reference page. RETURN VALUES
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_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 and 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
A subsystem may be reconfigured using the cfg_reconfigure kernel routine 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] = ' '; /***************************************************/ /* 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 "); break; case CFG_ATTR_EOP: printf("attribute does not allow this operation "); break; . . . default: printf("unknown error "); break; } } else printf(" successfully reconfigured "); } } SEE ALSO
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) cfg_reconfigure(9r)