man/man3rsm/rsm_get_segmentid_range.3rsm

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 RSM_GET_SEGMENTID_RANGE 3RSM "May 8, 2003"
 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_segmentid_range() and by
reserving a range of segment IDs in the segment ID configuration file,
/etc/rsm/rsm.segmentid. The rsm_get_segmentid_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(7) 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 (7)