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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
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<H2><A NAME="s9">9.</A> <A HREF="SCSI-Programming-HOWTO.html#toc9">Inquiry[$B>H2q(B]$B%3%^%s%I$NNc(B</A></H2>


<P>$B$b$C$H$b4pK\E*$J(B SCSI $B%3%^%s%I$N0l$D$,(B <CODE>INQUIRY</CODE> $B%3%^%s%I$G!"AuCV$N(B
$B<oN`$H9=@.$rL@$i$+$K$9$k$?$a$K;HMQ$5$l$^$9!#0J2<$O(BSCSI-2 $B;EMM=q$+$i$N(B
$BDj5A$G$9(B($B>\:Y$O(B SCSI-2 $BI8=`5,3J$r;2>H$N$3$H(B)$B!#(B</P>
<P>
<BLOCKQUOTE><CODE>
<PRE>
                            Table 44: INQUIRY Command
+=====-========-========-========-========-========-========-========-========+
|  Bit|   7    |   6    |   5    |   4    |   3    |   2    |   1    |   0    |
|Byte |        |        |        |        |        |        |        |        |
|=====+=======================================================================|
| 0   |                           Operation Code (12h)                        |
|-----+-----------------------------------------------------------------------|
| 1   | Logical Unit Number      |                  Reserved         |  EVPD  |
|-----+-----------------------------------------------------------------------|
| 2   |                           Page Code                                   |
|-----+-----------------------------------------------------------------------|
| 3   |                           Reserved                                    |
|-----+-----------------------------------------------------------------------|
| 4   |                           Allocation Length                           |
|-----+-----------------------------------------------------------------------|
| 5   |                           Control                                     |
+=============================================================================+
</PRE>
</CODE></BLOCKQUOTE>
</P>
<P>$B=PNO%G!<%?$O0J2<$NDL$j!'(B
<BLOCKQUOTE><CODE>
<PRE>
                     Table 45: Standard INQUIRY Data Format
+=====-========-========-========-========-========-========-========-========+
|  Bit|   7    |   6    |   5    |   4    |   3    |   2    |   1    |   0    |
|Byte |        |        |        |        |        |        |        |        |
|=====+==========================+============================================|
| 0   | Peripheral Qualifier     |           Peripheral Device Type           |
|-----+-----------------------------------------------------------------------|
| 1   |  RMB   |                  Device-Type Modifier                        |
|-----+-----------------------------------------------------------------------|
| 2   |   ISO Version   |       ECMA Version       |  ANSI-Approved Version   |
|-----+-----------------+-----------------------------------------------------|
| 3   |  AENC  | TrmIOP |     Reserved    |         Response Data Format      |
|-----+-----------------------------------------------------------------------|
| 4   |                           Additional Length (n-4)                     |
|-----+-----------------------------------------------------------------------|
| 5   |                           Reserved                                    |
|-----+-----------------------------------------------------------------------|
| 6   |                           Reserved                                    |
|-----+-----------------------------------------------------------------------|
| 7   | RelAdr | WBus32 | WBus16 |  Sync  | Linked |Reserved| CmdQue | SftRe  |
|-----+-----------------------------------------------------------------------|
| 8   | (MSB)                                                                 |
|- - -+---                        Vendor Identification                    ---|
| 15  |                                                                 (LSB) |
|-----+-----------------------------------------------------------------------|
| 16  | (MSB)                                                                 |
|- - -+---                        Product Identification                   ---|
| 31  |                                                                 (LSB) |
|-----+-----------------------------------------------------------------------|
| 32  | (MSB)                                                                 |
|- - -+---                        Product Revision Level                   ---|
| 35  |                                                                 (LSB) |
|-----+-----------------------------------------------------------------------|
| 36  |                                                                       |
|- - -+---                        Vendor Specific                          ---|
| 55  |                                                                       |
|-----+-----------------------------------------------------------------------|
| 56  |                                                                       |
|- - -+---                        Reserved                                 ---|
| 95  |                                                                       |
|=====+=======================================================================|
|     |                       Vendor-Specific Parameters                      |
|=====+=======================================================================|
| 96  |                                                                       |
|- - -+---                        Vendor Specific                          ---|
| n   |                                                                       |
+=============================================================================+
</PRE>
</CODE></BLOCKQUOTE>
</P>

<P>$B<!$NNc$ODc%l%Y%k4X?t(B <CODE>handle_SCSI_cmd</CODE> $B$r(B Inquiry SCSI $B%3%^%s%I$r(B
$B<B9T$9$k$?$a$K;HMQ$7$^$9!#(B</P>
<P>$B:G=i$K6&DL%X%C%@$K%3%^%s%IIt$rDI2C$7!"$=$l$+$i(B <CODE>handle_SCSI_cmd</CODE>
$B$r8F$S=P$7$^$9!#(B<CODE>handle_SCSI_cmd</CODE> $B$N8F$S=P$7$KBP$9$k=PNO%P%C%U%!%5%$%:(B
$B$N0z?t$O6&DL%X%C%@$N%5%$%:$r=|30$7$F$$$k$3$H$KCm0U$7$F$/$@$5$$!#(B
$B%(%i!<$,H/@8$7$J$+$C$?$J$i$P!"%3%^%s%I$,407k$7$?8e$K=PNO%P%C%U%!$OMW5a(B
$B$5$l$?%G!<%?$rJ]M-$9$k$3$H$K$J$j$^$9!#(B</P>
<P>
<BLOCKQUOTE><CODE>
<PRE>
#define INQUIRY_CMD     0x12
#define INQUIRY_CMDLEN  6
#define INQUIRY_REPLY_LEN 96
#define INQUIRY_VENDOR  8       /* $BJVEz%G!<%?Fb$N%Y%s%@L>$N%*%U%;%C%H(B */

/* $B%Y%s%@$N%V%i%s%I$H%b%G%k$rMW5a(B */
static unsigned char *Inquiry ( void )
{
  static unsigned char Inqbuffer[ SCSI_OFF + INQUIRY_REPLY_LEN ];
  unsigned char cmdblk [ INQUIRY_CMDLEN ] = 
      { INQUIRY_CMD,  /* command */
                  0,  /* lun/reserved */
                  0,  /* page code */
                  0,  /* reserved */
  INQUIRY_REPLY_LEN,  /* allocation length */
                  0 };/* reserved/flag/link */

  memcpy( cmd + SCSI_OFF, cmdblk, sizeof(cmdblk) );

  /*
   * +------------------+
   * | struct sg_header | &lt;- cmd
   * +------------------+
   * | copy of cmdblk   | &lt;- cmd + SCSI_OFF
   * +------------------+
   */

  if (handle_SCSI_cmd(sizeof(cmdblk), 0, cmd, 
                      sizeof(Inqbuffer) - SCSI_OFF, Inqbuffer )) {
      fprintf( stderr, "Inquiry failed\n" );
      exit(2);
  }
  return (Inqbuffer + SCSI_OFF);
}
</PRE>
</CODE></BLOCKQUOTE>
</P>

<P>$B>e$NNc$O<!$N$h$&$J9=B$$K$J$C$F$$$^$9!#(BInquiry $B4X?t$O$=$N%3%^%s%IIt$r(B
$B6&DL%X%C%@$N$"$H(B(<CODE>SCSI_OFF</CODE>$B$K$h$C$FM?$($i$l$^$9(B)$B$K%3%T!<$7$^$9!#(B
$BF~NO%G!<%?$O$3$N%3%^%s%I$KBP$7$F$OB8:_$7$^$;$s!#(B
<CODE>Handle_SCSI_cmd</CODE> $B$,%X%C%@9=B$BN$rDj5A$7$^$9!#(B
$B:#$d4X?t(B <CODE>main</CODE> $B$r<BAu$7!"$3$N:n6HCf$N8+K\%W%m%0%i%`$r40@.$G$-$^$9!#(B</P>
<P>
<BLOCKQUOTE><CODE>
<PRE>
void main( void )
{
  fd = open(DEVICE, O_RDWR);
  if (fd &lt; 0) {
    fprintf( stderr, "Need read/write permissions for "DEVICE".\n" );
    exit(1);
  }

  /* Inquiry $B$N7k2L$N0lIt$N%U%#!<%k%I$rI=<((B */
  printf( "%s\n", Inquiry() + INQUIRY_VENDOR );
}
</PRE>
</CODE></BLOCKQUOTE>
</P>

<P>$B:G=i$K%G%P%$%9%*!<%W%s$7!"%(%i!<$r%A%'%C%/$7$F$+$i!"9b0L$N%5%V%k!<%A%s(B
$B$r8F$S=P$7$^$9!#$=$N8e!"%Y%s%@!"@=IJ5Z$S%j%S%8%g%s$J$I$N7k2L$r?M4V$,FI(B
$B$a$k7A<0$GI=<($7$^$9!#(B</P>

<P>$BCm0U(B: Inquiry $B$N7k2L$K$O$3$N>.$5$J%W%m%0%i%`$,6!$9$k$h$j$b$b$C$HB?$/$N(B
$B>pJs$,$"$j$^$9!#$3$N%W%m%0%i%`$r%G%P%$%9$N<oN`$d(B ANSI $B$N%P!<%8%g%s$J$I(B
$B$r=P$9$h$&$K3HD%$7$?$/$J$k$+$b$7$l$^$;$s!#%G%P%$%9$N<oN`$K$OFCJL$J=EMW(B
$B@-$,$"$j$^$9!#$H$$$&$N$O$3$l$,$=$NAuCV$KBP$9$kI,?\$*$h$S%*%W%7%g%s$N%3(B
$B%^%s%I%;%C%H$r7hDj$9$k$+$i$G$9!#<+J,$G$3$l$r%W%m%0%i%`$7$?$/$J$$$N$G$"(B
$B$l$P!"(BEric Youngdale $B$K$h$k(B scsiinfo $B%W%m%0%i%`$r;HMQ$9$k$3$H$b$G$-$^(B
$B$9!#(Bscsiinfo $B$O(B SCSI $BAuCV$K$D$$$F$N$[$H$s$IA4$F$N>pJs$rMW5a$9$k$b$N$G(B
$B$9!#(Btsx-11.mit.edu $B$N(B pub/Linux/ALPHA/scsi $B$r8+$F$/$@$5$$!#(B</P>

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