#include #include #include #include #include #include #include #include #include #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) 1999-2016 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] Version 03.59 (20160528) 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(inq_cdb) */ #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 inq_cdb[INQ_CMD_LEN] = {0x12, 0, 0, 0, INQ_REPLY_LEN, 0}; unsigned char tur_cdb[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] '\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(inq_cdb); /* 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 = inq_cdb; 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(tur_cdb); io_hdr.mx_sb_len = sizeof(sense_buffer); io_hdr.dxfer_direction = SG_DXFER_NONE; io_hdr.cmdp = tur_cdb; 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; }