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我最近一直在玩一些硬盘驱动器的东西。现在我要做的是打印出硬盘的型号和序列号。使用 ioctl 非常容易使用 Sata 驱动器。另一方面，scsi 我必须发送查询命令。我找到了一个非常有用的网站，它解释了一切，甚至还有一个示例程序：http ://tldp.org/HOWTO/archived/SCSI-Programming-HOWTO/SCSI-Programming-HOWTO-24.html

但如果我把它打印出来，我只会得到什么或乱码。我什至不得不修复程序，因为没有包含 stdlib 并且函数 Inquiry 返回了一个局部变量。但我不知道如何解决它......

#define DEVICE "/dev/sdb"
/* Example program to demonstrate the generic SCSI interface */
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include <scsi/sg.h>

#define SCSI_OFF sizeof(struct sg_header)
static unsigned char cmd[SCSI_OFF + 18];      /* SCSI command buffer */
int fd;                               /* SCSI device/file descriptor */

/* process a complete scsi cmd. Use the generic scsi interface. */
static int handle_scsi_cmd(unsigned cmd_len,         /* command length */
                           unsigned in_size,         /* input data size */
                           unsigned char *i_buff,    /* input buffer */
                           unsigned out_size,        /* output data size */
                           unsigned char *o_buff     /* output buffer */
                           )
{
int status = 0;
struct sg_header *sg_hd;

/* safety checks */
if (!cmd_len) return -1;            /* need a cmd_len != 0 */
if (!i_buff) return -1;             /* need an input buffer != NULL */
#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;

/* generic scsi device header construction */
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; /* not necessary */
sg_hd->pack_id;     /* not used */
sg_hd->other_flags; /* not used */
#endif

/* send command */
status = write( fd, i_buff, SCSI_OFF + cmd_len + in_size );
if ( status < 0 || status != SCSI_OFF + cmd_len + in_size ||
                   sg_hd->result ) {
    /* some error happened */
    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;       /* buffer pointer check */

/* retrieve result */
status = read( fd, o_buff, SCSI_OFF + out_size);
if ( status < 0 || status != SCSI_OFF + out_size || sg_hd->result ) {
    /* some error happened */
    fprintf( stderr, "read(generic) result = 0x%x cmd = 0x%x\n", 
            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 < 0)
        perror("");
}
/* Look if we got what we expected to get */
if (status == SCSI_OFF + out_size) status = 0; /* got them all */

return status;  /* 0 means no error */
}

#define INQUIRY_CMD     0x12
#define INQUIRY_CMDLEN  6
#define INQUIRY_REPLY_LEN 96
#define INQUIRY_VENDOR  8       /* Offset in reply data to vendor name */

/* request vendor brand and model */
static unsigned char *Inquiry ( void )
{
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 | <- cmd
 * +------------------+
 * | copy of cmdblk   | <- 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);
}

void main( void )
{
  fd = open(DEVICE, O_RDWR);
  if (fd < 0) {
    fprintf( stderr, "Need read/write permissions for "DEVICE".\n" );
    exit(1);
  }

/* print some fields of the Inquiry result */
printf( "||%s||", Inquiry() + INQUIRY_VENDOR );

}

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