API Guide
601355 Rev A API Functions 2-667
Functions
When the API software is operating in asynchronous mode,
client software must call VS_Select to receive intermediate
and final status on command requests submitted through the
API interface to the VolServ system.
Two levels of default parameter settings are used in the API
software—global defaults and command-specific defaults.
• Global defaults are initialized at startup and can be set or
retrieved using VS_Global_SetFields and
VS_Global_GetFields function calls.
• Command-specific parameter defaults for the Export
command are set with VSCMD_Export_SetDefaults. If
command-specific defaults are set for all commands, they
override the global defaults for all commands.
The following fields can be retrieved from the status handle
after a successful Export request:
•VSID_ERROR_CODE,
•VSID_ERROR_CODE_ENTRY,
•VSID_ERROR_CODE_TABLE,
•VSID_MEDIA_ID,
•VSID_MEDIA_ID_ENTRY,
•VSID_MEDIA_ID_TABLE,
•VSID_SEQUENCE_NUM,
Tip
To override a default (global or command-specific)
parameter value for a specific instance of an Export
command, the parameter identifier and the value to be
used for the parameter can be submitted on the command
itself.