ACTIONPRO X7

Research

Research: File/Drive Access by Action Manager 1.3

Opening Drive/Device:

CreateFile():
Desired Access:	Generic Read/Write
Disposition:	Open
Options:	Synchronous IO Non-Alert, Non-Directory File
Attributes:	n/a
ShareMode:	Read, Write
AllocationSize:	n/a
OpenResult:	Opened

Sending Command: Windows Application sends IOCTL_SCSI_PASS_THROUGH with DeviceIoControl().

Research: Code Snippets using ioctl()

Code example #1:

#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.

#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <linux/usbdevice_fs.h>

void main(int argc, char **argv)
{
    const char *filename;
    int fd;

    filename = argv[1];

    fd = open(filename, O_WRONLY);
    ioctl(fd, USBDEVFS_RESET, 0);

    close(fd);

    return;
}

#define BUFF_SIZE 100 // - Buffersize

#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 *p = (struct sg_io_hdr *) malloc(sizeof(struct sg_io_hdr)); // - dynamic memory allocation - free() required somewhere

unsigned char cIOBuffer[BUFF_SIZE];
unsigned char replyBuffer[BUFF_SIZE]; // - dxfer buffer

// buffer initialization code omitted

memset(p, 0, sizeof(struct sg_io_hdr));
p->interface_id = 'S';
p->cmd_len = sizeof(turCmbBlk);
p->mx_sb_len = BUFF_SIZE;
p->dxfer_direction = SG_DXFER_NONE;
p->cmdp = turCmbBlk;
p->sbp = cIOBuffer;
p->timeout = DEF_TIMEOUT;
p->flags = SG_FLAG_DIRECT_IO; // - Does this help?
p->dxferp = replyBuffer; // - Set dxferp buffer - (A)
p->dxfer_len = BUFF_SIZE; // - buffersize

if (ioctl(fd, SG_IO, p) < 0)
{
  printf("ioctl error: errno=%d (%s)\n", errno, strerror(errno));
}

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

Use for scsi/sg.h and ioctl.