How do I programmatically get the hardware address for a SCSI device?

[Philip A. Reyniers]

I have a C++ program that obtains information about all the SCSI devices installed on a given 11.x server. However, I need to obtain the physical hardware address for a given device using C/C++. Now, I am not referring to using CSTM or ioscan, I am looking for a method of getting the physical hardware address ( i.e. 10/0/14/0.0.0 ) from the device name ( i.e. /dev/rdsk/c0t0d0 ) using C/C++.

Thanks in advance to all that reply.

Philip A. Reyniers

[Dietmar Konermann]

Philip,

tools like ioscan use the config driver (/dev/config) to obtain that kind of information. I'm afraid this API is not disclosed for general use.

Sorry...
Dietmar.

PS.: Maybe you should open a support call to get confirmation for this.

[Laurent Menase]

Hi Philip,

The best way to do it is a

#define BUFSZ 1024
int p[2];
char command[256];
char buf[BUFSZ];
int res;
FILE *f;
sprintf(command,"/usr/sbin/lssf %s 2>/dev/null",devfile);
f=popen(command,"r");
if (!f)
{
perror("popen");
}
if(fgets(buf,BUFSZ,f)!=0)
{
char *p,*q;
p=strstr(buf,"address");
if(p) p=strchr(p,' ');
if(p) q=strchr(++p,' ');
if(q) *q=0;

printf("%s\n",p);
} else
{
buf[0]=0;
if(ferror(f)) perror("fread");
else printf("nosuchdev?\n");
return -1
}
pclose(f);
}

[Steve Shoecraft · Accepted solution]

Attached is something that might help

[Philip A. Reyniers]

Steve,

Looking at souce you listed, I see that ioparmams.h has the following structure listed as such:

****************CODE LISTING****************
typedef struct ioconfig {
char name[MAX_NAME_LEN];
char class[MAX_NAME_LEN];
hw_path_t hw_path;
int instance;
} ioconfig_t;
***********STOP CODE LISTING****************

However, class is trated as a C++ keyword and thus will not compile. So, if I modify the source to the following:

****************CODE LISTING****************
typedef struct ioconfig {
char name[MAX_NAME_LEN];
char dclass[MAX_NAME_LEN];
hw_path_t hw_path;
int instance;
} ioconfig_t;
***********STOP CODE LISTING****************

The following compiles but cores when trying to create the union ioconfig_record rec:

****************CODE LISTING****************
#include
#include
#include
#include
#include
#include "ioparams.h"

int main( void ) {
FILE *fp;
union ioconfig_record rec;
unsigned long magic;
struct hw_path last_path;
char hw_path[14], *p;
int bytes, x;

cout << "DEBUG" << endl;

fp = fopen(IOCONFIG_FILE,"rb");
if ( !fp ) {
perror( "fopen" );
exit(0);
}
fclose(fp);
}
***********STOP CODE LISTING****************

Can you or anyone else provide some additional insight?

As always, Thanks In Advance.

Phil

[Martha Mueller]

try using lssf

lssf /dev/dsk/c6t4d0
sdisk card instance 6 SCSI target 4 SCSI LUN 0 section 0 at address 0/8/0/0.1.27.0.0.4.0 /dev/dsk/c6t4d0

[Dietmar Konermann]

Phil,

I hope you've seen the comment in ioparams.h... :)

NOTE:
This header file contains information specific to the internals of the HP-UX implementation. The contents of this header file are subject to change without notice. Such changes may affect source code, object code, or binary compatibility between releases of HP-UX. Code which uses the symbols contained within this header file is inherently non-portable (even between HP-UX implementations).

Best regards...
Dietmar.

[Steve Shoecraft]

Phil,

Just enclose your include for ioparms as an extern "C". This seems to work fine:

#ifdef __cplusplus
#define class ioclass
extern "C" {
#endif
#include "/usr/conf/io/ioparams.h"
#ifdef __cplusplus
};
#endif

[Philip A. Reyniers]

Steve and other available members,

I would like to start out by thanking you and the others that have replied to this question. All have provided solid direction and great snips of code.

There is a lot of information to gleem from these examples. However, unless I am not seeing the entire picture, it only appears to traverse the very top-level of hardware addresses. With this said, I think I have just few more questions on the subject that I hope that you might be able to shed some light on.

The ioparams.h include file procides some external (extern) functions:

*****************CODE SNIP******************
void *io_search __(( void *token, int type, int qual, ...));

void *io_search_array __(( void *token, int type, int qual, char *key[], void *dat[] ));

int io_query __(( void *token, int type, char *key, void *ptr ));

int io_get_key_info __(( int type, char *key, char *type_name, int *size ));

************STOP CODE SNIP******************

Do you know how these functions are used and can you provide an example?

I have included the external functions into my source but have not figured out how they should be called.

Thanks In Advance For Any All Assistance,

Phil

[Laurent Menase]

Hi Philip,

Those functions are defined in an internal lib
libIO.a which is not delivered.

really the only supportable way to do it is still to use lssf

In ioparms.h there is a
#ifdef _KERNEL
around the function proto. Which means those functions there a prototyped for kernel functions.