mrd_initialize - Send a SCSI Initialize Element Status command.
Windows NT mrd.dll
UNIX /usr/lib/libmrd.a
OpenVMS MRD$RTL.EXE
#include <mrd_common.h>
#include <mrd_message.h>
int mrd_initialize(
const char *robot_name,
char *log_info) ;
1 – Parameters
o robot_name - The name of the robot device to be opened. On
Digital UNIX, if the leading character of the name is not a
slash (/), /dev/ will be prepended to the name.
o log_info - This is a character array that should be at least
MRD_MAX_LOG_STRING in length. If this function fails as the
result of a SCSI error, this will be filled with the formatted
request sense data. If this function fails as the result
of an operating system error, the operating system message
particular to the error will be copied into the array.
2 – Description
The function sends a SCSI Initialize Element Status command to
the specified robot. This command is not supported by the TA and
TF loaders. On robots where this command is supported, it forces
a physical reinventory of the library or loader. On some library
systems this may take a long time.
Most library subsystems will perform an inventory when they are
powered on or have detected that the configuration may have
changed (doors opened, panels removed, etc). For this reason,
this routine is rarely needed.
3 – Example
/*
* Example of mrd_initialize(3mrd). The command usage is:
*
* mrd_init robot_name
*
* It has been observed on an empty TL820 with all the
* bin-packs in place that this command takes just under
* 23 minutes.
*/
#ifndef lint
static char SccsId[] = "@(#)mrd_init.c 1.2 3/5/97" ;
#endif
#include <stdio.h>
#include <stdlib.h>
#include <mrd_common.h>
#include <mrd_message.h>
main(int argc, char *argv[])
{
int status ; /* Status from mrd_inject(3mrd) */
char *robot ; /* The name of the robot */
char log_info[MRD_MAX_LOG_STRING+1] ; /* error string */
/*
* Accept one required argument; robot name
*/
if( argc < 2 ) {
printf("usage: %s robot\n", argv[0]) ;
exit(1) ;
}
/*
* Just use this directly from the command line.
*/
robot = argv[1] ;
/*
* Because this routine can take a long time we'll
* provide some positive feed-back that is doing
* something.
*/
printf("Reinventory library %s...", robot); fflush(stdout) ;
/*
* Call the function. Because this routine can take a
*/
status = mrd_initialize(robot, log_info) ;
/*
* Done.
*/
putchar('\n') ;
/*
* Print an error message if there is a failure. The
* routine mrd_strstatus(3mrd) will accept an MRD
* error status and return the corresponding string.
* If the log_info data has something other than a
* NULL as the first character print it as well. It
* typically be the SCSI sense data or a operating
* system specific message for the error.
*/
if( status != MRD_STATUS_SUCCESS )
printf("Initialize failed: %s: %s.\n", mrd_strstatus(status),
log_info[0] ? log_info : "none") ;
return 0 ;
}
4 – Return Values
Upon successful completion, the mrd_initialize(3mrd) function
returns the value MRD_STATUS_SUCCESS. If the mrd_initialize(3mrd)
fails the returned status value may be set to one of the
following values. Other values that correspond to specific SCSI
errors may also be possible, but these are the most likely.
4.1 – MRD_STATUS_PARAM
This error is returned if the robot_name or log_info arguments
are NULL pointers.
4.2 – MRD_STATUS_ROBOT_COMM_ERROR
This error code is used when an OpenVMS system service, such as
$ASSIGN or $QIO, fails with a status of SS$_DRVERR. Generally
SS$_DRVERR indicates a failure in the underlying device and the
MRD can get the detailed device failure and return the correct
MRD status code instead.
This error is also returned when a SCSI Test Unit Ready command
fails. The cause of the error can be determined by called mrd_
request_sense(3mrd). This error also occurs as the result of a
SCSI command failure, when the ASC is set to one of:
o 0x08 - Logical unit communcation errors.
o 0x43 - Message error
o 0x45 - Select or Reselect failure
o 0x47 - SCSI parity error
o 0x48 - Initiator detected error message received
o 0x49 - Invalid message error
o 0x4A - Command phase error
o 0x4B - Data phase error
o 0x4E - Overlapped commands attempted
o 0x54 - SCSI to host system interface failure
5 – Related Functions
o mrd(3mrd)
o mrd_initialize_element(3mrd)