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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
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 <TITLE>The Linux SCSI programming HOWTO: $B%X%C%@9=B$BN(B</TITLE>
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<A HREF="SCSI-Programming-HOWTO-9.html">$B<!$N%Z!<%8(B</A>
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<H2><A NAME="s8">8.</A> <A HREF="SCSI-Programming-HOWTO.html#toc8">$B%X%C%@9=B$BN(B</A></H2>


<P>
<A NAME="sec-header"></A> 
$B%X%C%@9=B$BN(B <CODE>struct sg_header</CODE> $B$O%"%W%j%1!<%7%g%s$H%+!<%M%k%I%i%$%P$N(B
$B4V$ND4@0AX$r$D$H$a$^$9!#(B
$B$G$O9=@.MWAG$K$D$$$F>\$7$/O@$8$k$3$H$K$7$^$7$g$&!#(B</P>
<P>
<DL>
<DT><B>int pack_len</B><DD><P>$B$O%I%i%$%P$K=q$+$l$k%V%m%C%/$N%5%$%:$rDj5A$7$^$9!#(B
$B$3$l$O%+!<%M%k$K$*$$$FFbIt$G$N;HMQ$N$?$a$KDj5A$5$l$^$9!#(B</P>
<DT><B>int reply_len</B><DD><P>$B$O1~Ez$G<u$1<h$i$l$k%V%m%C%/$N%5%$%:$rDj5A$7$^$9!#(B
$B$3$l$O%"%W%j%1!<%7%g%s$NB&$+$iDj5A$5$l$^$9!#(B</P>

<DT><B>int pack_id</B><DD><P>$B$3$N%U%#!<%k%I$OMW5a$KBP$9$k2sEz$r3dEv$F$k$N$KLrN)$A$^$9!#(B
$B%"%W%j%1!<%7%g%s$O3FMW5a$KBP$7$F0l0U$N(Bid$B$rM?$($k$3$H$,$G$-$^$9!#(B
$B?t8D$N%3%^%s%I(B($BNc$($P(B 4$B$D(B)$B$r0l$D$N%G%P%$%9$K(B write $B$7$?$H$7$^$7$g$&!#(B
$B$=$l$i$N%3%^%s%I$OJBNs$KF0:n$7!"$I$l$+0l$D$,:G$bB.$$$G$7$g$&!#(B
4$B2s$N(B read $B$K$h$C$F2sEz$r<u$1<h$k:]!"2sEz$OMW5a$7$?DL$j=gHV$G$"$kI,MW$O$"$j$^$;$s!#(B
$BM?$($?MW5a$KBP$9$k@5$7$$2sEz$rFCDj$9$k$?$a$K(B <CODE>pack_id</CODE> $B%U%#!<%k%I$r;HMQ$9$k$3$H$,(B
$B$G$-$^$9!#E57?E*$K$O$=$NCM$O3FMW5a$4$H$K2CA}$5$l$^$9(B($B$=$7$F$D$$$K$O0l<~$7$^$9(B)$B!#(B
$BL$2r7h$NMW5a$N:GBgNL$O%+!<%M%k$K$h$C$F(B SG_MAX_QUEUE ($BNc$($P(B 4)$B$K@)8B$5$l$F$$$^$9!#(B</P>

<DT><B>int result</B><DD><P><CODE>read</CODE> $B$"$k$$$O(B <CODE>write</CODE> $B8F$S=P$7$N7k2L%3!<%I!#(B
$B$3$l$O(B($B$?$^$K(B)$BHFMQ%I%i%$%P(B($B%+!<%M%k(B)$BB&$+$iDj5A$5$l$^$9!#(B
<CODE>write</CODE> $B$r8F=P$9A0$K$O(B NULL $B$K$7$F$*$/$N$,0BA4$G$9!#(B
$B$3$l$i$N%3!<%I$O(B <CODE>errno.h</CODE> $B$K$*$$$FDj5A$5$l$F$$$^$9(B(0 $B$O%(%i!<$J$7$r0UL#(B)$B!#(B</P>

<DT><B>unsigned int twelve_byte:1</B><DD><P>$B$3$N%U%#!<%k%I$OHsI8=`$N%Y%s%@8GM-$N%3%^%s%I$r;HMQ$9$k;~$K$@$1I,MW$G$9(B
(0xf0 - 0xff $B$NHO0O(B)$B!#$3$l$i$N%3%^%s%I$N%3%^%s%ID9$,(B 10 $B$G$O$J$/(B 12 $B$N(B
$B$H$-$O!"$3$N%U%#!<%k%I$O(B write $B$N8F$S=P$7$NA0$K(B 1 $B$K%;%C%H$5$l$M$P$J$j$^$;$s!#(B
$B$=$l0J30%3%^%s%ID9$O%5%]!<%H$5$l$F$$$^$;$s!#$3$l$O%"%W%j%1!<%7%g%sB&$+$i(B
$BDj5A$5$l$^$9!#(B</P>

<DT><B>unsigned char sense_buffer[16]</B><DD><P>$B$3$N%P%C%U%!$O%3%^%s%I$,40?k$7$?8e(B(<CODE>read()</CODE> $B$N8F$S=P$7$N8e(B)$B$G%;%C%H$5$l(B
SCSI $B$N%;%s%9%3!<%I$r4^$s$G$$$^$9!#%3%^%s%I$N7k2L$K$h$C$F$O$3$3$+$i(B
$BFI$_=P$5$M$P$J$i$J$$$b$N$b$"$j$^$9(B($BNc$($P(B <CODE>TESTUNITREADY</CODE>)$B!#(B
$BDL>o$O(B 0 $B%P%$%H$7$+$"$j$^$;$s!#$3$N%U%#!<%k%I$NCM$OHFMQ%I%i%$%P(B
($B%+!<%M%k(B)$BB&$+$i%;%C%H$5$l$^$9!#(B</P>
</DL>
</P>


<P>$B<!$N8+K\$N4X?t$OD>@\HFMQ%+!<%M%k%I%i%$%P$K:nMQ$7$^$9!#%X%C%@9=B$BN$rDj5A$7!"(B
<CODE>write</CODE> $B$rMQ$$$F%3%^%s%I$rAw=P$7!"(B<CODE>read</CODE> $B$K$h$C$F7k2L$r<u$1<h$j!"(B
$BB?>/$N(B($B8B$i$l$?(B)$B%(%i!<%A%'%C%/$r9T$$$^$9!#%;%s%9%P%C%U%!%G!<%?$O(B
$B=PNO%P%C%U%!$NCf$G<j$KF~$l$k$3$H$,$G$-$^$9(B($B%L%k%]%$%s%?$,M?$($i$l$F$$$J$$(B
$B8B$j!"$=$N>l9g$OF~NO%P%C%U%!Fb$K$"$j$^$9(B)$B!#$3$l$r0J2<$NNc$NCf$GMQ$$$k(B
$B$3$H$K$7$^$9!#(B</P>

<P>$BCm0U!'(B<CODE>DEVICE</CODE>$B$NCM$r$"$J$?$N%G%P%$%9$r5-=R$9$k$b$N$K@_Dj$7$F$/$@$5$$!#(B
<BLOCKQUOTE><CODE>
<PRE>
#define DEVICE "/dev/sgc"

/* $BHFMQ(B SCSI $B%$%s%?!<%U%'!<%9$r<B:]$KF0$+$7$F$_$k8+K\%W%m%0%i%`(B */
#include &lt;stdio.h>
#include &lt;unistd.h>
#include &lt;string.h>
#include &lt;fcntl.h>
#include &lt;errno.h>
#include &lt;scsi/sg.h>


#define SCSI_OFF sizeof(struct sg_header)
static unsigned char cmd[SCSI_OFF + 18];      /* SCSI $B%3%^%s%I(B $B%P%C%U%!(B */
int fd;                               /* SCSI $B%G%P%$%9(B/$B%U%!%$%k(B $B%G%#%9%/%j%W%?(B */

/* $B407k$7$?(B SCSI $B%3%^%s%I$r=hM}!#(B $BHFMQ(B SCSI $B%$%s%?!<%U%'!<%9$r;HMQ(B */
static int handle_SCSI_cmd(unsigned cmd_len,         /* $B%3%^%s%ID9(B */
                           unsigned in_size,         /* $BF~NO%G!<%?%5%$%:(B */
                           unsigned char *i_buff,    /* $BF~NO%P%C%U%!(B */
                           unsigned out_size,        /* $B=PNO%G!<%?%5%$%:(B */
                           unsigned char *o_buff     /* $B=PNO%P%C%U%!(B */
                           )
{
    int status = 0;
    struct sg_header *sg_hd;

    /* $B0BA4@-8!::(B */
    if (!cmd_len) return -1;            /* cmd_len != 0 $B$,I,MW(B */
    if (!i_buff) return -1;             /* $BF~NO%P%C%U%!$,(B NULL $B$G$J$$$3$H(B */
#ifdef SG_BIG_BUFF
    if (SCSI_OFF + cmd_len + in_size > SG_BIG_BUFF) return -1;
    if (SCSI_OFF + out_size > SG_BIG_BUFF) return -1;
#else
    if (SCSI_OFF + cmd_len + in_size > 4096) return -1;
    if (SCSI_OFF + out_size > 4096) return -1;
#endif

    if (!o_buff) out_size = 0;      /* $B=PNO%P%C%U%!$J$7!"=PNO%5%$%:$J$7(B */

    /* $BHFMQ(B SCSI $B%G%P%$%9%X%C%@$N9=C[(B */
    sg_hd = (struct sg_header *) i_buff;
    sg_hd->reply_len   = SCSI_OFF + out_size;
    sg_hd->twelve_byte = cmd_len == 12;
    sg_hd->result = 0;
#if     0
    sg_hd->pack_len    = SCSI_OFF + cmd_len + in_size; /* $BITMW(B */
    sg_hd->pack_id;     /* $BL$;HMQ(B */
    sg_hd->other_flags; /* $BL$;HMQ(B */
#endif

    /* $B%3%^%s%IAw=P(B */
    status = write( fd, i_buff, SCSI_OFF + cmd_len + in_size );
    if ( status &lt; 0 || status != SCSI_OFF + cmd_len + in_size || 
                       sg_hd->result ) {
        /* $B$J$s$i$+$N%(%i!<$,H/@8(B */
        fprintf( stderr, "write(generic) result = 0x%x cmd = 0x%x\n",
                    sg_hd->result, i_buff[SCSI_OFF] );
        perror("");
        return status;
    }
    
    if (!o_buff) o_buff = i_buff;       /* $B%P%C%U%!$N%]%$%s%?$r%A%'%C%/(B */

    /* $B7k2L$r2s<}(B */
    status = read( fd, o_buff, SCSI_OFF + out_size);
    if ( status &lt; 0 || status != SCSI_OFF + out_size || sg_hd->result ) {
        /* $B$J$s$i$+$N%(%i!<$,H/@8(B */
        fprintf( stderr, "read(generic) status = 0x%x, result = 0x%x, "
                         "cmd = 0x%x\n", 
                         status, sg_hd->result, o_buff[SCSI_OFF] );
        fprintf( stderr, "read(generic) sense "
                "%x %x %x %x %x %x %x %x %x %x %x %x %x %x %x %x\n", 
                sg_hd->sense_buffer[0],         sg_hd->sense_buffer[1],
                sg_hd->sense_buffer[2],         sg_hd->sense_buffer[3],
                sg_hd->sense_buffer[4],         sg_hd->sense_buffer[5],
                sg_hd->sense_buffer[6],         sg_hd->sense_buffer[7],
                sg_hd->sense_buffer[8],         sg_hd->sense_buffer[9],
                sg_hd->sense_buffer[10],        sg_hd->sense_buffer[11],
                sg_hd->sense_buffer[12],        sg_hd->sense_buffer[13],
                sg_hd->sense_buffer[14],        sg_hd->sense_buffer[15]);
        if (status &lt; 0)
            perror("");
    }
    /* $B<u$1<h$k$Y$-$b$N$r<u$1<h$C$?$+$I$&$+$r$_$k(B */
    if (status == SCSI_OFF + out_size) status = 0; /* $BA4It$b$i$C$?(B */

    return status;  /* 0 $B$O%(%i!<$J$7$r0UL#(B */
}
</PRE>
</CODE></BLOCKQUOTE>
</P>

<P>$B$3$l$O:G=i$O$$$/$V$s$+J#;($K$_$($k$+$b$7$l$^$;$s$,!"%3!<%I$N$[$H$s$I(B
$B$O%(%i!<$N%A%'%C%/$HJs9p$G$9(B($B$3$l$O%3!<%I$,F0:n$9$k$h$&$K$J$C$?$"$H$G$b(B
$BLr$KN)$A$^$9(B)$B!#(B</P>

<P><CODE>Handle_SCSI_cmd</CODE> $B$OA4$F$N(B SCSI $B%3%^%s%I$N<oN`$KBP$7$F$N0lHLE*$J(B
$B7A<0$rHw$($F$$$F!"0J2<$N$h$&$KJ,N`$5$l$^$9!'(B</P>

<P>
<BLOCKQUOTE><CODE>
<PRE>
$B!!!!!!!!%G!<%?%b!<%I!!!!!!!!!!(B| $B%3%^%s%I$NNc(B
===============================================
$B!!F~NO!&=PNO%G!<%?$H$b$K$J$7!!(B| test unit ready
$BF~NO%G!<%?$J$7!"=PNO%G!<%?$"$j(B| inquiry, read
$BF~NO%G!<%?$"$j!"=PNO%G!<%?$J$7(B| mode select, write
$B!!F~NO!&=PNO%G!<%?$H$b$K$"$j!!(B| mode sense
</PRE>
</CODE></BLOCKQUOTE>
</P>

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