/* Mammoth 2 Debug Buffer Dumper   Copyright 2000 Enhanced Software Technologies Inc.$Date: 2001/06/05 17:10:21 $$Revision: 1.1.1.1 $   Written by Eric Lee Green <eric@estinc.com>   Released under the terms of the GNU General Public License v2 or    above.   This is an example of how to use the mtx library file 'mtxl.c' to   do a special-purpose task -- dump the Mammoth2 debug buffer, in this case.    Note that this debug buffer is 1M-4M in size, thus may overwhelm the   SCSI generic subsystem on some supported platforms...   syntax:   mam2debug generic-filename output-filename.*/#include <stdio.h>#include <sys/types.h>#include <sys/stat.h>#include <fcntl.h>#include "mtx.h"#include "mtxl.h"/* This is a TOTALLY UNDOCUMENTED feature to read the debug data buffer * in an Exabyte Mammoth II and dump it to a file: */static RequestSense_T *DumpM2DebugBuff(DEVICE_TYPE MediumChangerFD, int outfile) {  RequestSense_T *RequestSense = xmalloc(sizeof(RequestSense_T));  CDB_T CDB;  unsigned char *databuffer;  unsigned char buff_descriptor[4];  int numbytes;  int testbytes;  CDB[0]=0x3c; /* command. */   CDB[1]=0x03;  /* mode - read buff_descriptor! */   CDB[2]=0x00;    /* page -- data. */   CDB[3]=0;   /* offset. */  CDB[4]=0;  CDB[5]=0;    CDB[6]=0;    /* length. */  CDB[7]=0;  CDB[8]=4;   /* the descriptor is 4 long. */   CDB[9]=0;    if ((testbytes=SCSI_ExecuteCommand(MediumChangerFD, Input, &CDB, 10,			  buff_descriptor, 4, RequestSense)) != 0){    fprintf(stderr,"mam2debug: could not read buff_descriptor. [%d]\n",testbytes);    return RequestSense;  /* couldn't do it. */   }  /* okay, read numbytes: */  numbytes=(buff_descriptor[1]<<16) + (buff_descriptor[2]<<8) + buff_descriptor[3];  databuffer=(unsigned char *) xmalloc(numbytes+1000000); /* see if this helps :-(. */  CDB[6]=buff_descriptor[1];  CDB[7]=buff_descriptor[2];  CDB[8]=buff_descriptor[3];  CDB[1]=0x02; /* mode -- read buffer! */    if (SCSI_ExecuteCommand(MediumChangerFD, Input, &CDB, 10,			  databuffer, numbytes, RequestSense) != 0){    fprintf(stderr,"mam2debug: could not read buffer.\n");    free(databuffer);    return RequestSense;  /* couldn't do it. */   }    write(outfile,databuffer,numbytes);  close(outfile);  free(databuffer);  free(RequestSense);  return NULL;  /* okay! */}static void usage(void) {  fprintf(stderr,"Usage: mam2debug scsi-generic-file output-file-name\n");  exit(1);}/* Now for the actual main() routine: */int main(int argc,char** argv) {  DEVICE_TYPE changer_fd;  static RequestSense_T *result;  int outfile;  if (argc != 3) {    usage();  }    changer_fd=SCSI_OpenDevice(argv[1]);    if (changer_fd <= 0) {    fprintf(stderr,"Could not open input device\n");    usage();  }  outfile=open(argv[2],O_CREAT|O_WRONLY);  if (outfile <=0) {    fprintf(stderr,"Could not open output file\n");    usage();  }  result=DumpM2DebugBuff(changer_fd, outfile);  if (result) {    PrintRequestSense(result);    exit(1);  }  exit(0);}