c++ - 使用 SCSI 传递的 ioctrl

Question

使用 Windows，我可以使用以下简化代码轻松地与我的 USB 设备通信:

DWORD dwJunk;    // discard results from DeviceIOControl()
int   iReply;
char  cBuffer[100];
// cBuffer is initialized here.
HANDLE hDevice; // handle to the drive to be examined 
CString sDrive = _T(\\\\.\\H:); // drive H: for this test
hDevice = CreateFile(sDrive,            // drive to open
   GENERIC_READ | GENERIC_WRITE,        // read and write access to the drive
   FILE_SHARE_READ | FILE_SHARE_WRITE,  // share mode           
   NULL,                                // default security attributes
   OPEN_EXISTING,                       // disposition
   0,                                   // file attributes
   NULL);                               // do not copy file attributes

iReply = DeviceIoControl(hDevice, IOCTL_SCSI_PASS_THROUGH_DIRECT, &cBuffer, sizeof(cBuffer), &cBuffer, sizeof(cBuffer), &dwJunk, (LPOVERLAPPED)NULL);

我试图在 Linux 中做同样的事情，但无法找出 ioctrl() 参数，或者更好地放置结构。代码片段将非常感激。谢谢。

Answer 1

不幸的是，我使用您的链接修改的代码没有返回任何结果。这是我使用的剥离代码。 ioctl() 返回没有错误:

#define DEF_TIMEOUT 5000 // 5 seconds
char cDiskName[] = "/dev/sg3";
int fd = open(cDiskName, O_RDWR);
if (fd < 0)
{
  printf("Open error: %s, errno=%d (%s)\n", cDiskName, errno, strerror(errno));
  return 1;
}

unsigned char turCmbBlk[] = {0x00, 0, 0, 0, 0, 0};
struct sg_io_hdr io_hdr;

unsigned char cIOBuffer[100];

// buffer initialization code omitted

memset(&io_hdr, 0, sizeof(struct sg_io_hdr));
io_hdr.interface_id = 'S';
io_hdr.cmd_len = sizeof(turCmbBlk);
io_hdr.mx_sb_len = sizeof(cIOBuffer);
io_hdr.dxfer_direction = SG_DXFER_NONE;
io_hdr.cmdp = turCmbBlk;
io_hdr.sbp = cIOBuffer;
io_hdr.timeout = DEF_TIMEOUT;
if (ioctl(fd, SG_IO, &io_hdr) < 0)
{
  printf("ioctl error: errno=%d (%s)\n", errno, strerror(errno));
}

// Code returned here without any errors but cIOBuffer remains unchanged.

也许调用需要不同的请求代码？