topic Re: How do I programmatically get the hardware address for a SCSI device? in Operating System - HP-UX

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

Philip A. Reyniers — Thu, 15 Jan 2004 22:30:16 GMT

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

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

Dietmar Konermann — Fri, 16 Jan 2004 03:44:37 GMT

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.

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

Laurent Menase — Fri, 16 Jan 2004 06:46:43 GMT

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);
}

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

Steve Shoecraft — Fri, 16 Jan 2004 07:00:57 GMT

Attached is something that might help

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

Philip A. Reyniers — Fri, 16 Jan 2004 10:11:49 GMT

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

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

Martha Mueller — Fri, 16 Jan 2004 11:02:43 GMT

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

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

Dietmar Konermann — Fri, 16 Jan 2004 11:29:51 GMT

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.

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

Steve Shoecraft — Fri, 16 Jan 2004 20:35:16 GMT

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

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

Philip A. Reyniers — Sat, 17 Jan 2004 11:52:59 GMT

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

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

Laurent Menase — Sat, 17 Jan 2004 17:23:06 GMT

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.