RSM_MEMSEG_IMPORT_CONNECT(3RSM) Remote Shared Memory Library Functions


NAME


rsm_memseg_import_connect, rsm_memseg_import_disconnect - create or break
logical connection between import and export segments

SYNOPSIS


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

int rsm_memseg_import_connect(
rsmapi_controller_handle_t controller,
rsm_node_id_t nodeid, rsm_memseg_id_t segment_id,
rsm_permission_t perm, rsm_memseg_import_handle_t *memseg);


int rsm_memseg_import_disconnect(
rsm_memseg_import_handle_t memseg);


DESCRIPTION


The rsm_memseg_import_connect() function provides a means of creating an
import segment called memseg and establishing a logical connection with
an export segment identified by the segment_id on the node specified by
node_id. The controller specified by controller must have a physical
connection with the controller (see rsm_get_interconnect_topology(3RSM))
used while exporting the segment identified by segment_id on node
specified by node_id. The perm argument specifies the mode of access that
the importer is requesting for this connection. In the connection
process, the mode of access and the importers userid and groupid are
compared with the access permissions specified by the exporter. If the
request mode is not valid, the connection request is denied. The perm
argument is limited to the following octal values:

0400
read mode


0200
write mode


0600
read/write mode


The rsm_memseg_import_disconnect() function breaks the logical connection
between the import segment and the exported segment and deallocates the
resources associated with the import segment handle memseg.

RETURN VALUES


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

ERRORS


The rsm_memseg_import_connect() and rsm_memseg_import_disconnect()
functions can return the following errors:

RSMERR_BAD_SEG_HNDL
Invalid segment handle.


The rsm_memseg_import_connect() function can return the following
errors:

RSMERR_BAD_CTLR_HNDL

Invalid controller handle.


RSMERR_CTLR_NOT_PRESENT

Controller not present.


RSMERR_PERM_DENIED

Permission denied.


RSMERR_INSUFFICIENT_MEM

Insufficient memory.


RSMERR_INSUFFICIENT_RESOURCES

Insufficient resources.


RSMERR_SEG_NOT_PUBLISHED_TO_NODE

Segment not published to node.


RSMERR_SEG_NOT_PUBLISHED

Segment not published at all.


RSMERR_BAD_ADDR

Bad address.


RSMERR_REMOTE_NODE_UNREACHABLE

Remote not not reachable.


RSMERR_INTERRUPTED

Connection interrupted.


The rsm_memseg_import_disconnect() function can return the following
errors:

RSMERR_SEG_STILL_MAPPED
Segment still mapped, need to unmap before
disconnect.


RSMERR_POLLFD_IN_USE
Poll file descriptor in use.


ATTRIBUTES


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


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

SEE ALSO


rsm_memseg_import_map(3RSM), attributes(5)


November 26, 2017
RSM_MEMSEG_IMPORT_CONNECT(3RSM)