scsicmds.h

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/*
 * scsicmds.h
 *
 * Home page of code is: https://www.smartmontools.org
 *
 * Copyright (C) 2002-8 Bruce Allen
 * Copyright (C) 2000 Michael Cornwell <cornwell@acm.org>
 * Copyright (C) 2003-18 Douglas Gilbert <dgilbert@interlog.com>
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 *
 *
 * N.B. What was formerly known as "SMART" are now called "informational
 * exceptions" in recent t10.org drafts (i.e. recent SCSI).
 *
 */
 
 
#ifndef SCSICMDS_H_
#define SCSICMDS_H_
 
#define SCSICMDS_H_CVSID "$Id: scsicmds.h 5302 2022-01-14 20:11:03Z dpgilbert $\n"
 
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
 
/* #define SCSI_DEBUG 1 */ /* Comment out to disable command debugging */
 
/* Following conditional defines just in case OS already has them defined.
 * If they are defined we hope they are defined correctly (for SCSI). */
#ifndef TEST_UNIT_READY
#define TEST_UNIT_READY 0x0
#endif
#ifndef LOG_SELECT
#define LOG_SELECT 0x4c
#endif
#ifndef LOG_SENSE
#define LOG_SENSE 0x4d
#endif
#ifndef MODE_SENSE
#define MODE_SENSE 0x1a
#endif
#ifndef MODE_SENSE_10
#define MODE_SENSE_10 0x5a
#endif
#ifndef MODE_SELECT
#define MODE_SELECT 0x15
#endif
#ifndef MODE_SELECT_10
#define MODE_SELECT_10 0x55
#endif
#ifndef INQUIRY
#define INQUIRY 0x12
#endif
#ifndef REQUEST_SENSE
#define REQUEST_SENSE  0x03
#endif
#ifndef RECEIVE_DIAGNOSTIC
#define RECEIVE_DIAGNOSTIC  0x1c
#endif
#ifndef SEND_DIAGNOSTIC
#define SEND_DIAGNOSTIC  0x1d
#endif
#ifndef READ_DEFECT_10
#define READ_DEFECT_10  0x37
#endif
#ifndef READ_DEFECT_12
#define READ_DEFECT_12  0xb7
#endif
#ifndef START_STOP_UNIT         /* SSU */
#define START_STOP_UNIT  0x1b
#endif
#ifndef REPORT_LUNS
#define REPORT_LUNS  0xa0
#endif
#ifndef READ_CAPACITY_10
#define READ_CAPACITY_10  0x25
#endif
#ifndef READ_CAPACITY_16
#define READ_CAPACITY_16  0x9e
#endif
#ifndef SAI_READ_CAPACITY_16    /* service action for READ_CAPACITY_16 */
#define SAI_READ_CAPACITY_16  0x10
#endif
 
#ifndef SAT_ATA_PASSTHROUGH_12
#define SAT_ATA_PASSTHROUGH_12 0xa1
#endif
#ifndef SAT_ATA_PASSTHROUGH_16
#define SAT_ATA_PASSTHROUGH_16 0x85
#endif
 
 
#define DXFER_NONE        0
#define DXFER_FROM_DEVICE 1
#define DXFER_TO_DEVICE   2
 
struct scsi_cmnd_io
{
    uint8_t * cmnd;     /* [in]: ptr to SCSI command block (cdb) */
    size_t  cmnd_len;   /* [in]: number of bytes in SCSI command */
    int dxfer_dir;      /* [in]: DXFER_NONE, DXFER_FROM_DEVICE, or
                                 DXFER_TO_DEVICE */
    uint8_t * dxferp;   /* [in]: ptr to outgoing or incoming data buffer */
    size_t dxfer_len;   /* [in]: bytes to be transferred to/from dxferp */
    uint8_t * sensep;   /* [in]: ptr to sense buffer, filled when
                                 CHECK CONDITION status occurs */
    size_t max_sense_len; /* [in]: max number of bytes to write to sensep */
    unsigned timeout;   /* [in]: seconds, 0-> default timeout (60 seconds?) */
    size_t resp_sense_len;  /* [out]: sense buffer length written */
    uint8_t scsi_status;  /* [out]: 0->ok, 2->CHECK CONDITION, etc ... */
    int resid;          /* [out]: Number of bytes requested to be transferred
                                  less actual number transferred (0 if not
                                   supported) */
};
 
struct scsi_sense_disect {
    uint8_t resp_code;
    uint8_t sense_key;
    uint8_t asc;
    uint8_t ascq;
    int progress; /* -1 -> N/A, 0-65535 -> available */
};
 
/* Useful data from Informational Exception Control mode page (0x1c) */
#define SCSI_IECMP_RAW_LEN 64
struct scsi_iec_mode_page {
    uint8_t requestedCurrent;
    uint8_t gotCurrent;
    uint8_t requestedChangeable;
    uint8_t gotChangeable;
    uint8_t modese_len;   /* 0 (don't know), 6 or 10 */
    uint8_t raw_curr[SCSI_IECMP_RAW_LEN];
    uint8_t raw_chg[SCSI_IECMP_RAW_LEN];
};
 
/* Carrier for Error counter log pages (e.g. read, write, verify ...) */
struct scsiErrorCounter {
    uint8_t gotPC[7];
    uint8_t gotExtraPC;
    uint64_t counter[8];
};
 
/* Carrier for Non-medium error log page */
struct scsiNonMediumError {
    uint8_t gotPC0;
    uint8_t gotExtraPC;
    uint64_t counterPC0;
    uint8_t gotTFE_H;
    uint64_t counterTFE_H; /* Track following errors [Hitachi] */
    uint8_t gotPE_H;
    uint64_t counterPE_H;  /* Positioning errors [Hitachi] */
};
 
struct scsi_readcap_resp {
    uint64_t num_lblocks;       /* Number of Logical Blocks on device */
    uint32_t lb_size;   /* should be available in all non-error cases */
    /* following fields from READ CAPACITY(16) or set to 0 */
    uint8_t prot_type;  /* 0, 1, 2 or 3 protection type, deduced from
                         * READ CAPACITY(16) P_TYPE and PROT_EN fields */
    uint8_t p_i_exp;    /* Protection information Intervals Exponent */
    uint8_t lb_p_pb_exp;/* Logical Blocks per Physical Block Exponent */
    bool lbpme;         /* Logical Block Provisioning Management Enabled */
    bool lbprz;         /* Logical Block Provisioning Read Zeros */
    uint16_t l_a_lba;   /* Lowest Aligned Logical Block Address */
};
 
struct scsi_supp_log_pages {
    uint8_t page_code;
    uint8_t subpage_code;
};
 
/* SCSI Peripheral types (of interest) */
#define SCSI_PT_DIRECT_ACCESS           0x0
#define SCSI_PT_SEQUENTIAL_ACCESS       0x1
#define SCSI_PT_CDROM                   0x5
#define SCSI_PT_MEDIUM_CHANGER          0x8
#define SCSI_PT_ENCLOSURE               0xd
#define SCSI_PT_HOST_MANAGED            0x14    /* Zoned disk */
 
/* Transport protocol identifiers or just Protocol identifiers */
#define SCSI_TPROTO_FCP 0
#define SCSI_TPROTO_SPI 1
#define SCSI_TPROTO_SSA 2
#define SCSI_TPROTO_1394 3
#define SCSI_TPROTO_SRP 4            /* SCSI over RDMA */
#define SCSI_TPROTO_ISCSI 5
#define SCSI_TPROTO_SAS 6
#define SCSI_TPROTO_ADT 7
#define SCSI_TPROTO_ATA 8
#define SCSI_TPROTO_UAS 9            /* USB attached SCSI */
#define SCSI_TPROTO_SOP 0xa          /* SCSI over PCIe */
#define SCSI_TPROTO_PCIE 0xb         /* includes NVMe */
#define SCSI_TPROTO_NONE 0xf
 
 
/* SCSI Log Pages retrieved by LOG SENSE. 0x0 to 0x3f, 0x30 to 0x3e vendor */
#define SUPPORTED_LPAGES                    0x00
#define BUFFER_OVERRUN_LPAGE                0x01
#define WRITE_ERROR_COUNTER_LPAGE           0x02
#define READ_ERROR_COUNTER_LPAGE            0x03
#define READ_REVERSE_ERROR_COUNTER_LPAGE    0x04
#define VERIFY_ERROR_COUNTER_LPAGE          0x05
#define NON_MEDIUM_ERROR_LPAGE              0x06
#define LAST_N_ERROR_EVENTS_LPAGE           0x07
#define FORMAT_STATUS_LPAGE                 0x08
#define LAST_N_DEFERRED_LPAGE               0x0b   /* or async events */
#define LB_PROV_LPAGE                       0x0c   /* SBC-3 */
#define TEMPERATURE_LPAGE                   0x0d
#define STARTSTOP_CYCLE_COUNTER_LPAGE       0x0e
#define APPLICATION_CLIENT_LPAGE            0x0f
#define SELFTEST_RESULTS_LPAGE              0x10
#define SS_MEDIA_LPAGE                      0x11   /* SBC-3 */
#define DEVICE_STATS_LPAGE                  0x14   /* SSC-5 */
#define BACKGROUND_RESULTS_LPAGE            0x15   /* SBC-3 */
#define ATA_PT_RESULTS_LPAGE                0x16   /* SAT */
#define NONVOL_CACHE_LPAGE                  0x17   /* SBC-3 */
#define PROTOCOL_SPECIFIC_LPAGE             0x18
#define GEN_STATS_PERF_LPAGE                0x19
#define POWER_COND_TRANS_LPAGE              0x1a
#define IE_LPAGE                            0x2f
 
/* SCSI Log subpages (8 bits), added spc4r05 2006, standardized SPC-4 2015 */
#define NO_SUBPAGE_L_SPAGE              0x0     /* 0x0-0x3f,0x0 */
#define LAST_N_INQ_DAT_L_SPAGE          0x1     /* 0xb,0x1 */
#define LAST_N_MODE_PG_L_SPAGE          0x2     /* 0xb,0x2 */
#define ENVIRO_REP_L_SPAGE              0x1     /* 0xd,0x1 */
#define ENVIRO_LIMITS_L_SPAGE           0x2     /* 0xd,0x2 */
#define UTILIZATION_L_SPAGE             0x1     /* 0xe,0x1 */
#define ZB_DEV_STATS_L_SPAGE            0x1     /* 0x14,0x1 */
#define PEND_DEFECTS_L_SPAGE            0x1     /* 0x15,0x1 */
#define BACKGROUND_OP_L_SPAGE           0x2     /* 0x15,0x2 */
#define LPS_MISALIGN_L_SPAGE            0x3     /* 0x15,0x3 */
#define SUPP_SPAGE_L_SPAGE              0xff    /* 0x0,0xff pages+subpages */
 
/* Seagate vendor specific log pages. */
#define SEAGATE_CACHE_LPAGE                 0x37
#define SEAGATE_FACTORY_LPAGE               0x3e
 
/* Log page response lengths */
#define LOG_RESP_SELF_TEST_LEN 0x194
 
/* See the SSC-2 document at www.t10.org . Earlier note: From IBM
Documentation, see http://www.storage.ibm.com/techsup/hddtech/prodspecs.htm */
#define TAPE_ALERTS_LPAGE                        0x2e
 
/* ANSI SCSI-3 Mode Pages */
#define VENDOR_UNIQUE_PAGE                       0x00
#define READ_WRITE_ERROR_RECOVERY_PAGE           0x01
#define DISCONNECT_RECONNECT_PAGE                0x02
#define FORMAT_DEVICE_PAGE                       0x03
#define RIGID_DISK_DRIVE_GEOMETRY_PAGE           0x04
#define FLEXIBLE_DISK_PAGE                       0x05
#define VERIFY_ERROR_RECOVERY_PAGE               0x07
#define CACHING_PAGE                             0x08
#define PERIPHERAL_DEVICE_PAGE                   0x09
#define XOR_CONTROL_MODE_PAGE                    0x10
#define CONTROL_MODE_PAGE                        0x0a
#define MEDIUM_TYPES_SUPPORTED_PAGE              0x0b
#define NOTCH_PAGE                               0x0c
#define CD_DEVICE_PAGE                           0x0d
#define CD_AUDIO_CONTROL_PAGE                    0x0e
#define DATA_COMPRESSION_PAGE                    0x0f
#define ENCLOSURE_SERVICES_MANAGEMENT_PAGE       0x14
#define PROTOCOL_SPECIFIC_LUN_PAGE               0x18
#define PROTOCOL_SPECIFIC_PORT_PAGE              0x19
#define POWER_CONDITION_PAGE                     0x1a
#define INFORMATIONAL_EXCEPTIONS_CONTROL_PAGE    0x1c
#define FAULT_FAILURE_REPORTING_PAGE             0x1c
 
/* Background control mode subpage is [0x1c,0x1] */
#define BACKGROUND_CONTROL_M_SUBPAGE             0x1   /* SBC-2 */
 
#define ALL_MODE_PAGES                           0x3f
 
/* Mode page control field */
#define MPAGE_CONTROL_CURRENT               0
#define MPAGE_CONTROL_CHANGEABLE            1
#define MPAGE_CONTROL_DEFAULT               2
#define MPAGE_CONTROL_SAVED                 3
 
/* SCSI Vital Product Data (VPD) pages */
#define SCSI_VPD_SUPPORTED_VPD_PAGES    0x0
#define SCSI_VPD_UNIT_SERIAL_NUMBER     0x80
#define SCSI_VPD_DEVICE_IDENTIFICATION  0x83
#define SCSI_VPD_EXTENDED_INQUIRY_DATA  0x86
#define SCSI_VPD_ATA_INFORMATION        0x89
#define SCSI_VPD_POWER_CONDITION        0x8a
#define SCSI_VPD_POWER_CONSUMPTION      0x8d
#define SCSI_VPD_BLOCK_LIMITS           0xb0
#define SCSI_VPD_BLOCK_DEVICE_CHARACTERISTICS   0xb1
#define SCSI_VPD_LOGICAL_BLOCK_PROVISIONING     0xb2
#define SCSI_VPD_ZONED_BLOCK_DEV_CHAR   0xb6
 
/* defines for useful SCSI Status codes */
#define SCSI_STATUS_CHECK_CONDITION     0x2
 
/* defines for useful Sense Key codes */
#define SCSI_SK_NO_SENSE                0x0
#define SCSI_SK_RECOVERED_ERR           0x1
#define SCSI_SK_NOT_READY               0x2
#define SCSI_SK_MEDIUM_ERROR            0x3
#define SCSI_SK_HARDWARE_ERROR          0x4
#define SCSI_SK_ILLEGAL_REQUEST         0x5
#define SCSI_SK_UNIT_ATTENTION          0x6
#define SCSI_SK_ABORTED_COMMAND         0xb
 
/* defines for useful Additional Sense Codes (ASCs) */
#define SCSI_ASC_NOT_READY              0x4     /* more info in ASCQ code */
#define SCSI_ASC_NO_MEDIUM              0x3a    /* more info in ASCQ code */
#define SCSI_ASC_UNKNOWN_OPCODE         0x20
#define SCSI_ASC_INVALID_FIELD          0x24
#define SCSI_ASC_UNKNOWN_PARAM          0x26
#define SCSI_ASC_WARNING                0xb
#define SCSI_ASC_IMPENDING_FAILURE      0x5d
 
#define SCSI_ASCQ_ATA_PASS_THROUGH      0x1d
 
/* Simplified error code (negative values as per errno) */
#define SIMPLE_NO_ERROR                 0
#define SIMPLE_ERR_NOT_READY            1
#define SIMPLE_ERR_BAD_OPCODE           2
#define SIMPLE_ERR_BAD_FIELD            3       /* in cbd */
#define SIMPLE_ERR_BAD_PARAM            4       /* in data */
#define SIMPLE_ERR_BAD_RESP             5       /* response fails sanity */
#define SIMPLE_ERR_NO_MEDIUM            6       /* no medium present */
#define SIMPLE_ERR_BECOMING_READY       7       /* device will be ready soon */
#define SIMPLE_ERR_TRY_AGAIN            8       /* some warning, try again */
#define SIMPLE_ERR_MEDIUM_HARDWARE      9       /* medium or hardware error */
#define SIMPLE_ERR_UNKNOWN              10      /* unknown sense value */
#define SIMPLE_ERR_ABORTED_COMMAND      11      /* probably transport error */
 
 
/* defines for functioncode parameter in SENDDIAGNOSTIC function */
#define SCSI_DIAG_NO_SELF_TEST          0x00
#define SCSI_DIAG_DEF_SELF_TEST         0xff
#define SCSI_DIAG_BG_SHORT_SELF_TEST    0x01
#define SCSI_DIAG_BG_EXTENDED_SELF_TEST 0x02
#define SCSI_DIAG_FG_SHORT_SELF_TEST    0x05
#define SCSI_DIAG_FG_EXTENDED_SELF_TEST 0x06
#define SCSI_DIAG_ABORT_SELF_TEST       0x04
 
/* Defines for power_cond in scsiSetPowerCondition() (SSU command) */
#define SCSI_POW_COND_ACTIVE            0x1
#define SCSI_POW_COND_IDLE              0x2
#define SCSI_POW_COND_STANDBY           0x3
 
 
/* SCSI command timeout values (units are seconds) */
#define SCSI_TIMEOUT_DEFAULT    60  // should be longer than the spin up time
                                    // of a disk in JBOD.
 
#define SCSI_TIMEOUT_SELF_TEST  (5 * 60 * 60)   /* allow max 5 hours for */
                                            /* extended foreground self test */
 
 
 
#define LOGPAGEHDRSIZE  4
 
class scsi_device;
 
// Set of supported SCSI VPD pages. Constructor fetches Supported VPD pages
// VPD page and remembers the response for later queries.
class supported_vpd_pages
{
public:
    explicit supported_vpd_pages(scsi_device * device);
 
    bool is_supported(int vpd_page_num) const;
 
private:
    int num_valid;      /* 0 or less for invalid */
    unsigned char pages[256];
};
 
extern supported_vpd_pages * supported_vpd_pages_p;
 
/* This is a heuristic that takes into account the command bytes and length
 * to decide whether the presented unstructured sequence of bytes could be
 * a SCSI command. If so it returns true otherwise false. Vendor specific
 * SCSI commands (i.e. opcodes from 0xc0 to 0xff), if presented, are assumed
 * to follow SCSI conventions (i.e. length of 6, 10, 12 or 16 bytes). The
 * only SCSI commands considered above 16 bytes of length are the Variable
 * Length Commands (opcode 0x7f) and the XCDB wrapped commands (opcode 0x7e).
 * Both have an inbuilt length field which can be cross checked with clen.
 * No NVMe commands (64 bytes long plus some extra added by some OSes) have
 * opcodes 0x7e or 0x7f yet. ATA is register based but SATA has FIS
 * structures that are sent across the wire. The FIS register structure is
 * used to move a command from a SATA host to device, but the ATA 'command'
 * is not the first byte. So it is harder to say what will happen if a
 * FIS structure is presented as a SCSI command, hopefully there is a low
 * probability this function will yield true in that case. */
bool is_scsi_cdb(const uint8_t * cdbp, int clen);
 
// Print SCSI debug messages?
extern unsigned char scsi_debugmode;
 
void scsi_do_sense_disect(const struct scsi_cmnd_io * in,
                          struct scsi_sense_disect * out);
 
int scsiSimpleSenseFilter(const struct scsi_sense_disect * sinfo);
 
const char * scsiErrString(int scsiErr);
 
/* Yield string associated with sense_key value. Returns 'buff'. */
char * scsi_get_sense_key_str(int sense_key, int buff_len, char * buff);
 
int scsi_vpd_dev_id_iter(const unsigned char * initial_desig_desc,
                         int page_len, int * off, int m_assoc,
                         int m_desig_type, int m_code_set);
 
int scsi_decode_lu_dev_id(const unsigned char * b, int blen, char * s,
                          int slen, int * transport);
 
 
/* STANDARD SCSI Commands  */
int scsiTestUnitReady(scsi_device * device);
 
int scsiStdInquiry(scsi_device * device, uint8_t *pBuf, int bufLen);
 
int scsiInquiryVpd(scsi_device * device, int vpd_page, uint8_t *pBuf,
                   int bufLen);
 
int scsiLogSense(scsi_device * device, int pagenum, int subpagenum,
                 uint8_t *pBuf, int bufLen, int known_resp_len);
 
int scsiLogSelect(scsi_device * device, int pcr, int sp, int pc, int pagenum,
                  int subpagenum, uint8_t *pBuf, int bufLen);
 
int scsiModeSense(scsi_device * device, int pagenum, int subpagenum, int pc,
                  uint8_t *pBuf, int bufLen);
 
int scsiModeSelect(scsi_device * device, int sp, uint8_t *pBuf, int bufLen);
 
int scsiModeSense10(scsi_device * device, int pagenum, int subpagenum, int pc,
                    uint8_t *pBuf, int bufLen);
 
int scsiModeSelect10(scsi_device * device, int sp, uint8_t *pBuf, int bufLen);
 
int scsiModePageOffset(const uint8_t * resp, int len, int modese_len);
 
int scsiRequestSense(scsi_device * device,
                     struct scsi_sense_disect * sense_info);
 
int scsiSetPowerCondition(scsi_device * device, int power_cond,
                          int pcond_modifier = 0);
 
int scsiSendDiagnostic(scsi_device * device, int functioncode, uint8_t *pBuf,
                       int bufLen);
 
bool scsi_pass_through_with_retry(scsi_device * device, scsi_cmnd_io * iop);
 
int scsiReadDefect10(scsi_device * device, int req_plist, int req_glist,
                     int dl_format, uint8_t *pBuf, int bufLen);
 
int scsiReadDefect12(scsi_device * device, int req_plist, int req_glist,
                     int dl_format, int addrDescIndex, uint8_t *pBuf,
                     int bufLen);
 
int scsiReadCapacity10(scsi_device * device, unsigned int * last_lbp,
                       unsigned int * lb_sizep);
 
int scsiReadCapacity16(scsi_device * device, uint8_t *pBuf, int bufLen);
 
/* SMART specific commands */
int scsiCheckIE(scsi_device * device, int hasIELogPage, int hasTempLogPage,
                uint8_t *asc, uint8_t *ascq, uint8_t *currenttemp,
                uint8_t *triptemp);
 
int scsiFetchIECmpage(scsi_device * device, struct scsi_iec_mode_page *iecp,
                      int modese_len);
int scsi_IsExceptionControlEnabled(const struct scsi_iec_mode_page *iecp);
int scsi_IsWarningEnabled(const struct scsi_iec_mode_page *iecp);
int scsiSetExceptionControlAndWarning(scsi_device * device, int enabled,
                            const struct scsi_iec_mode_page *iecp);
void scsiDecodeErrCounterPage(unsigned char * resp,
                              struct scsiErrorCounter *ecp);
void scsiDecodeNonMediumErrPage(unsigned char * resp,
                                struct scsiNonMediumError *nmep);
int scsiFetchExtendedSelfTestTime(scsi_device * device, int * durationSec,
                                  int modese_len);
int scsiCountFailedSelfTests(scsi_device * device, int noisy);
int scsiSelfTestInProgress(scsi_device * device, int * inProgress);
int scsiFetchControlGLTSD(scsi_device * device, int modese_len, int current);
int scsiSetControlGLTSD(scsi_device * device, int enabled, int modese_len);
int scsiFetchTransportProtocol(scsi_device * device, int modese_len);
int scsiGetRPM(scsi_device * device, int modese_len, int * form_factorp,
               int * haw_zbcp);
int scsiGetSetCache(scsi_device * device,  int modese_len, short int * wce,
                    short int * rcd);
uint64_t scsiGetSize(scsi_device * device, bool avoid_rcap16,
                     struct scsi_readcap_resp * srrp);
 
/* T10 Standard IE Additional Sense Code strings taken from t10.org */
const char* scsiGetIEString(uint8_t asc, uint8_t ascq);
int scsiGetTemp(scsi_device * device, uint8_t *currenttemp, uint8_t *triptemp);
 
 
int scsiSmartDefaultSelfTest(scsi_device * device);
int scsiSmartShortSelfTest(scsi_device * device);
int scsiSmartExtendSelfTest(scsi_device * device);
int scsiSmartShortCapSelfTest(scsi_device * device);
int scsiSmartExtendCapSelfTest(scsi_device * device);
int scsiSmartSelfTestAbort(scsi_device * device);
 
const char * scsiTapeAlertsTapeDevice(unsigned short code);
const char * scsiTapeAlertsChangerDevice(unsigned short code);
 
const char * scsi_get_opcode_name(uint8_t opcode);
void scsi_format_id_string(char * out, const uint8_t * in, int n);
 
void dStrHex(const uint8_t * up, int len, int no_ascii);
 
/* Attempt to find the first SCSI sense data descriptor that matches the
   given 'desc_type'. If found return pointer to start of sense data
   descriptor; otherwise (including fixed format sense data) returns NULL. */
const unsigned char * sg_scsi_sense_desc_find(const unsigned char * sensep,
                                              int sense_len, int desc_type);
 
 
/* SCSI command transmission interface function declaration. Its
 * definition is target OS specific (see os_<OS>.c file).
 * Returns 0 if SCSI command successfully launched and response
 * received. Even when 0 is returned the caller should check
 * scsi_cmnd_io::scsi_status for SCSI defined errors and warnings
 * (e.g. CHECK CONDITION). If the SCSI command could not be issued
 * (e.g. device not present or not a SCSI device) or some other problem
 * arises (e.g. timeout) then returns a negative errno value. */
// Moved to C++ interface
//int do_scsi_cmnd_io(int dev_fd, struct scsi_cmnd_io * iop, int report);
 
 
 
#endif