| #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; |
| } |
