rsm_get_segmentid_range(3RSM)			      Remote Shared Memory Library Functions			     rsm_get_segmentid_range(3RSM)

NAME

       rsm_get_segmentid_range - get segment ID range

SYNOPSIS

       cc [ flag... ] file... -lrsm [ library... ]
       #include <rsmapi.h>

       int rsm_get_segmentid_range(const char *appid,
	    rsm_memseg_id_t *baseid, uint32_t *length);

DESCRIPTION

       RSM  segment IDs can be either specified by the application or generated by the system using the  rsm_memseg_export_publish(3RSM) function.
       Applications that specify segment IDs require a reserved range of segment IDs that they can use. This can be achieved by using rsm_get_seg-
       mentid_range()  and  by	reserving a range of segment IDs in the segment ID configuration file, /etc/rsm/rsm.segmentid. The rsm_get_segmen-
       tid_range() function can be used by applications to obtain the segment ID range reserved for them. The appid argument is a  null-terminated
       string  that  identifies the application. The baseid argument points to the location where the starting segment ID of the reserved range is
       returned. The length argument points to the location where the number of reserved segment IDs is returned.

       The application can use any value starting at baseid and less than baseid+length. The application should use an offset within the range	of
       reserved segment IDs to obtain a segment ID such that if the baseid or length is modified, it will still be within its reserved range.

       It  is the responsibility of the system administrator to make sure that the segment ID ranges are properly administered (such that they are
       non-overlapping, the file on various nodes of the cluster have identical entries, and so forth.) Entries in the /etc/rsm/rsm.segmentid file
       are of the form:

	 #keyword	appid	 baseid    length
	 reserved     SUNWfoo  0x600000  1000

       The  fields in the file are separated by tabs or blanks. The first string is a keyword "reserve", followed by the application identifier (a
       string without spaces), the baseid (the starting segment ID of the reserved range in hexadecimal), and the length (the number of segmentids
       reserved).  Comment lines contain a "#" in the first column. The file should not contain blank or empty lines. Segment IDs reserved for the
       system are defined in the </usr/include/rsm/rsm_common.h> header and cannot be used by the applications.

RETURN VALUES

       Upon successful completion, these functions return 0. Otherwise, an error value is returned to indicate the error.

ERRORS

       The rsm_get_segmentid_range() function can return the following errors:

       RSMERR_BAD_ADDR	    The address passed is invalid.

       RSMERR_BAD_APPID     The appid is not defined in configuration file.

       RSMERR_BAD_CONF	    The configuration file is not present or not readable, or the configuration file format is incorrect.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |ATTRIBUTE TYPE		     |ATTRIBUTE VALUE		   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Unstable			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       rsm_memseg_export_publish(3RSM), attributes(5)

SunOS 5.11							    8 May 2003					     rsm_get_segmentid_range(3RSM)