home *** CD-ROM | disk | FTP | other *** search
- #include <unistd.h>
- #include <fcntl.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <errno.h>
- #include <sys/ioctl.h>
- #include <sys/types.h>
- #include <sys/stat.h>
- #include "sg_linux_inc.h"
-
- /* This is a simple program executing a SCSI INQUIRY command and a
- TEST UNIT READY command using the SCSI generic (sg) driver.
- There is another variant of this program called "sg_simple1"
- which includes the sg_lib.h header and logic and so has more
- advanced error processing.
- This version demonstrates the "sg3" interface.
- In the lk 2.6 series devices nodes such as /dev/sda also support
- the SG_IO ioctl.
-
- * Copyright (C) 1999-2007 D. Gilbert
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2, or (at your option)
- * any later version.
-
- Invocation: sg_simple2 [-x] <scsi_device>
-
- Version 03.58 (20070312)
-
- 6 byte INQUIRY command:
- [0x12][ |lu][pg cde][res ][al len][cntrl ]
-
- 6 byte TEST UNIT READY command:
- [0x00][ |lu][res ][res ][res ][res ]
-
- */
-
- #define INQ_REPLY_LEN 96 /* logic assumes >= sizeof(inqCmdBlk) */
- #define INQ_CMD_LEN 6
- #define TUR_CMD_LEN 6
-
- #define EBUFF_SZ 256
-
-
- int main(int argc, char * argv[])
- {
- int sg_fd, k;
- unsigned char inqCmdBlk [INQ_CMD_LEN] =
- {0x12, 0, 0, 0, INQ_REPLY_LEN, 0};
- unsigned char turCmdBlk [TUR_CMD_LEN] =
- {0x00, 0, 0, 0, 0, 0};
- unsigned char inqBuff[INQ_REPLY_LEN];
- sg_io_hdr_t io_hdr;
- char * file_name = 0;
- char ebuff[EBUFF_SZ];
- unsigned char sense_buffer[32];
- int do_extra = 0;
-
- for (k = 1; k < argc; ++k) {
- if (0 == memcmp("-x", argv[k], 2))
- do_extra = 1;
- else if (*argv[k] == '-') {
- printf("Unrecognized switch: %s\n", argv[k]);
- file_name = 0;
- break;
- }
- else if (0 == file_name)
- file_name = argv[k];
- else {
- printf("too many arguments\n");
- file_name = 0;
- break;
- }
- }
- if (0 == file_name) {
- printf("Usage: 'sg_simple2 [-x] <sg_device>'\n");
- return 1;
- }
-
- /* N.B. An access mode of O_RDWR is required for some SCSI commands */
- if ((sg_fd = open(file_name, O_RDONLY)) < 0) {
- snprintf(ebuff, EBUFF_SZ,
- "sg_simple2: error opening file: %s", file_name);
- perror(ebuff);
- return 1;
- }
- /* Just to be safe, check we have a new sg device by trying an ioctl */
- if ((ioctl(sg_fd, SG_GET_VERSION_NUM, &k) < 0) || (k < 30000)) {
- printf("sg_simple2: %s doesn't seem to be an new sg device\n",
- file_name);
- close(sg_fd);
- return 1;
- }
-
- /* Prepare INQUIRY command */
- memset(&io_hdr, 0, sizeof(sg_io_hdr_t));
- io_hdr.interface_id = 'S';
- io_hdr.cmd_len = sizeof(inqCmdBlk);
- /* io_hdr.iovec_count = 0; */ /* memset takes care of this */
- io_hdr.mx_sb_len = sizeof(sense_buffer);
- io_hdr.dxfer_direction = SG_DXFER_FROM_DEV;
- io_hdr.dxfer_len = INQ_REPLY_LEN;
- io_hdr.dxferp = inqBuff;
- io_hdr.cmdp = inqCmdBlk;
- io_hdr.sbp = sense_buffer;
- io_hdr.timeout = 20000; /* 20000 millisecs == 20 seconds */
- /* io_hdr.flags = 0; */ /* take defaults: indirect IO, etc */
- /* io_hdr.pack_id = 0; */
- /* io_hdr.usr_ptr = NULL; */
-
- if (ioctl(sg_fd, SG_IO, &io_hdr) < 0) {
- perror("sg_simple2: Inquiry SG_IO ioctl error");
- close(sg_fd);
- return 1;
- }
-
- /* now for the error processing */
- if ((io_hdr.info & SG_INFO_OK_MASK) != SG_INFO_OK) {
- if (io_hdr.sb_len_wr > 0) {
- printf("INQUIRY sense data: ");
- for (k = 0; k < io_hdr.sb_len_wr; ++k) {
- if ((k > 0) && (0 == (k % 10)))
- printf("\n ");
- printf("0x%02x ", sense_buffer[k]);
- }
- printf("\n");
- }
- if (io_hdr.masked_status)
- printf("INQUIRY SCSI status=0x%x\n", io_hdr.status);
- if (io_hdr.host_status)
- printf("INQUIRY host_status=0x%x\n", io_hdr.host_status);
- if (io_hdr.driver_status)
- printf("INQUIRY driver_status=0x%x\n", io_hdr.driver_status);
- }
- else { /* output result if it is available */
- char * p = (char *)inqBuff;
- int f = (int)*(p + 7);
- printf("Some of the INQUIRY command's results:\n");
- printf(" %.8s %.16s %.4s ", p + 8, p + 16, p + 32);
- printf("[wide=%d sync=%d cmdque=%d sftre=%d]\n",
- !!(f & 0x20), !!(f & 0x10), !!(f & 2), !!(f & 1));
- }
- /* Extra info, not necessary to look at */
- if (do_extra)
- printf("INQUIRY duration=%u millisecs, resid=%d, msg_status=%d\n",
- io_hdr.duration, io_hdr.resid, (int)io_hdr.msg_status);
-
- /* Prepare TEST UNIT READY command */
- memset(&io_hdr, 0, sizeof(sg_io_hdr_t));
- io_hdr.interface_id = 'S';
- io_hdr.cmd_len = sizeof(turCmdBlk);
- io_hdr.mx_sb_len = sizeof(sense_buffer);
- io_hdr.dxfer_direction = SG_DXFER_NONE;
- io_hdr.cmdp = turCmdBlk;
- io_hdr.sbp = sense_buffer;
- io_hdr.timeout = 20000; /* 20000 millisecs == 20 seconds */
-
- if (ioctl(sg_fd, SG_IO, &io_hdr) < 0) {
- perror("sg_simple2: Test Unit Ready SG_IO ioctl error");
- close(sg_fd);
- return 1;
- }
-
- /* now for the error processing */
- if ((io_hdr.info & SG_INFO_OK_MASK) != SG_INFO_OK) {
- if (io_hdr.sb_len_wr > 0) {
- printf("TEST UNIT READY sense data: ");
- for (k = 0; k < io_hdr.sb_len_wr; ++k) {
- if ((k > 0) && (0 == (k % 10)))
- printf("\n ");
- printf("0x%02x ", sense_buffer[k]);
- }
- printf("\n");
- }
- else if (io_hdr.masked_status)
- printf("TEST UNIT READY SCSI status=0x%x\n", io_hdr.status);
- else if (io_hdr.host_status)
- printf("TEST UNIT READY host_status=0x%x\n", io_hdr.host_status);
- else if (io_hdr.driver_status)
- printf("TEST UNIT READY driver_status=0x%x\n",
- io_hdr.driver_status);
- else
- printf("TEST UNIT READY unexpected error\n");
- printf("Test Unit Ready failed so unit may _not_ be ready!\n");
- }
- else
- printf("Test Unit Ready successful so unit is ready!\n");
- /* Extra info, not necessary to look at */
- if (do_extra)
- printf("TEST UNIT READY duration=%u millisecs, resid=%d, msg_status=%d\n",
- io_hdr.duration, io_hdr.resid, (int)io_hdr.msg_status);
-
- close(sg_fd);
- return 0;
- }
-