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Comment:Add the VFS-trace shim.
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SHA1: f49a9ef3387bd4453f5654ebe83fea445c03cf4d
User & Date: drh 2011-03-16 16:56:29
Context
2011-03-16
17:05
Add the -vfstrace option to the usage error message in the shell. check-in: baca45c5 user: drh tags: trunk
16:56
Add the VFS-trace shim. check-in: f49a9ef3 user: drh tags: trunk
2011-03-15
19:08
Make the "unix-excl" VFS work exactly like "unix" if the database file is read-only. check-in: d9846834 user: drh tags: trunk
Changes
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Changes to src/shell.c.

  2633   2633   int main(int argc, char **argv){
  2634   2634     char *zErrMsg = 0;
  2635   2635     struct callback_data data;
  2636   2636     const char *zInitFile = 0;
  2637   2637     char *zFirstCmd = 0;
  2638   2638     int i;
  2639   2639     int rc = 0;
         2640  +
  2640   2641   
  2641   2642     Argv0 = argv[0];
  2642   2643     main_init(&data);
  2643   2644     stdin_is_interactive = isatty(0);
  2644   2645   
  2645   2646     /* Make sure we have a valid signal handler early, before anything
  2646   2647     ** else is done.
................................................................................
  2682   2683           if( c=='K' ){ szHeap *= 1000; break; }
  2683   2684           if( c=='G' ){ szHeap *= 1000000000; break; }
  2684   2685         }
  2685   2686         if( szHeap>0x7fff0000 ) szHeap = 0x7fff0000;
  2686   2687   #if defined(SQLITE_ENABLE_MEMSYS3) || defined(SQLITE_ENABLE_MEMSYS5)
  2687   2688         sqlite3_config(SQLITE_CONFIG_HEAP, malloc((int)szHeap), (int)szHeap, 64);
  2688   2689   #endif
         2690  +#ifdef SQLITE_ENABLE_VFSTRACE
         2691  +    }else if( strcmp(argv[i],"-vfstrace")==0 ){
         2692  +      extern int vfstrace_register(
         2693  +         const char *zTraceName,
         2694  +         const char *zOldVfsName,
         2695  +         int (*xOut)(const char*,void*),
         2696  +         void *pOutArg,
         2697  +         int makeDefault
         2698  +      );
         2699  +      vfstrace_register("trace",0,(int(*)(const char*,void*))fputs, stderr, 1);
         2700  +#endif
  2689   2701       }else if( strcmp(argv[i],"-vfs")==0 ){
  2690   2702         sqlite3_vfs *pVfs = sqlite3_vfs_find(argv[++i]);
  2691   2703         if( pVfs ){
  2692   2704           sqlite3_vfs_register(pVfs, 1);
  2693   2705         }else{
  2694   2706           fprintf(stderr, "no such VFS: \"%s\"\n", argv[i]);
  2695   2707           exit(1);
................................................................................
  2799   2811       }else if( strcmp(z,"-interactive")==0 ){
  2800   2812         stdin_is_interactive = 1;
  2801   2813       }else if( strcmp(z,"-batch")==0 ){
  2802   2814         stdin_is_interactive = 0;
  2803   2815       }else if( strcmp(z,"-heap")==0 ){
  2804   2816         i++;
  2805   2817       }else if( strcmp(z,"-vfs")==0 ){
         2818  +      i++;
         2819  +    }else if( strcmp(z,"-vfstrace")==0 ){
  2806   2820         i++;
  2807   2821       }else if( strcmp(z,"-help")==0 || strcmp(z, "--help")==0 ){
  2808   2822         usage(1);
  2809   2823       }else{
  2810   2824         fprintf(stderr,"%s: Error: unknown option: %s\n", Argv0, z);
  2811   2825         fprintf(stderr,"Use -help for a list of options.\n");
  2812   2826         return 1;

Added src/test_vfstrace.c.

            1  +/*
            2  +** 2011 March 16
            3  +**
            4  +** The author disclaims copyright to this source code.  In place of
            5  +** a legal notice, here is a blessing:
            6  +**
            7  +**    May you do good and not evil.
            8  +**    May you find forgiveness for yourself and forgive others.
            9  +**    May you share freely, never taking more than you give.
           10  +**
           11  +******************************************************************************
           12  +**
           13  +** This file contains code implements a VFS shim that writes diagnostic
           14  +** output for each VFS call, similar to "strace".
           15  +*/
           16  +#include <stdlib.h>
           17  +#include <string.h>
           18  +#include "sqlite3.h"
           19  +
           20  +/*
           21  +** An instance of this structure is attached to the each trace VFS to
           22  +** provide auxiliary information.
           23  +*/
           24  +typedef struct vfstrace_info vfstrace_info;
           25  +struct vfstrace_info {
           26  +  sqlite3_vfs *pRootVfs;              /* The underlying real VFS */
           27  +  int (*xOut)(const char*, void*);    /* Send output here */
           28  +  void *pOutArg;                      /* First argument to xOut */
           29  +  const char *zVfsName;               /* Name of this trace-VFS */
           30  +  sqlite3_vfs *pTraceVfs;             /* Pointer back to the trace VFS */
           31  +};
           32  +
           33  +/*
           34  +** The sqlite3_file object for the trace VFS
           35  +*/
           36  +typedef struct vfstrace_file vfstrace_file;
           37  +struct vfstrace_file {
           38  +  sqlite3_file base;        /* Base class.  Must be first */
           39  +  vfstrace_info *pInfo;     /* The trace-VFS to which this file belongs */
           40  +  const char *zFName;       /* Base name of the file */
           41  +  sqlite3_file *pReal;      /* The real underlying file */
           42  +};
           43  +
           44  +/*
           45  +** Method declarations for vfstrace_file.
           46  +*/
           47  +static int vfstraceClose(sqlite3_file*);
           48  +static int vfstraceRead(sqlite3_file*, void*, int iAmt, sqlite3_int64 iOfst);
           49  +static int vfstraceWrite(sqlite3_file*,const void*,int iAmt, sqlite3_int64);
           50  +static int vfstraceTruncate(sqlite3_file*, sqlite3_int64 size);
           51  +static int vfstraceSync(sqlite3_file*, int flags);
           52  +static int vfstraceFileSize(sqlite3_file*, sqlite3_int64 *pSize);
           53  +static int vfstraceLock(sqlite3_file*, int);
           54  +static int vfstraceUnlock(sqlite3_file*, int);
           55  +static int vfstraceCheckReservedLock(sqlite3_file*, int *);
           56  +static int vfstraceFileControl(sqlite3_file*, int op, void *pArg);
           57  +static int vfstraceSectorSize(sqlite3_file*);
           58  +static int vfstraceDeviceCharacteristics(sqlite3_file*);
           59  +static int vfstraceShmLock(sqlite3_file*,int,int,int);
           60  +static int vfstraceShmMap(sqlite3_file*,int,int,int, void volatile **);
           61  +static void vfstraceShmBarrier(sqlite3_file*);
           62  +static int vfstraceShmUnmap(sqlite3_file*,int);
           63  +
           64  +/*
           65  +** Method declarations for vfstrace_vfs.
           66  +*/
           67  +static int vfstraceOpen(sqlite3_vfs*, const char *, sqlite3_file*, int , int *);
           68  +static int vfstraceDelete(sqlite3_vfs*, const char *zName, int syncDir);
           69  +static int vfstraceAccess(sqlite3_vfs*, const char *zName, int flags, int *);
           70  +static int vfstraceFullPathname(sqlite3_vfs*, const char *zName, int, char *);
           71  +static void *vfstraceDlOpen(sqlite3_vfs*, const char *zFilename);
           72  +static void vfstraceDlError(sqlite3_vfs*, int nByte, char *zErrMsg);
           73  +static void (*vfstraceDlSym(sqlite3_vfs*,void*, const char *zSymbol))(void);
           74  +static void vfstraceDlClose(sqlite3_vfs*, void*);
           75  +static int vfstraceRandomness(sqlite3_vfs*, int nByte, char *zOut);
           76  +static int vfstraceSleep(sqlite3_vfs*, int microseconds);
           77  +static int vfstraceCurrentTime(sqlite3_vfs*, double*);
           78  +static int vfstraceGetLastError(sqlite3_vfs*, int, char*);
           79  +static int vfstraceCurrentTimeInt64(sqlite3_vfs*, sqlite3_int64*);
           80  +static int vfstraceSetSystemCall(sqlite3_vfs*, const char *zName, void *pFunc);
           81  +static void *vfstraceGetSystemCall(sqlite3_vfs*, const char *zName);
           82  +static const char *vfstraceNextSystemCall(sqlite3_vfs*, const char *zName);
           83  +
           84  +/*
           85  +** Return a pointer to the tail of the pathname.  Examples:
           86  +**
           87  +**     /home/drh/xyzzy.txt -> xyzzy.txt
           88  +**     xyzzy.txt           -> xyzzy.txt
           89  +*/
           90  +static const char *fileTail(const char *z){
           91  +  int i;
           92  +  if( z==0 ) return 0;
           93  +  i = strlen(z)-1;
           94  +  while( i>0 && z[i-1]!='/' ){ i--; }
           95  +  return &z[i];
           96  +}
           97  +
           98  +/*
           99  +** Send trace output defined by zFormat and subsequent arguments.
          100  +*/
          101  +static void vfstrace_printf(
          102  +  vfstrace_info *pInfo,
          103  +  const char *zFormat,
          104  +  ...
          105  +){
          106  +  va_list ap;
          107  +  char *zMsg;
          108  +  va_start(ap, zFormat);
          109  +  zMsg = sqlite3_vmprintf(zFormat, ap);
          110  +  va_end(ap);
          111  +  pInfo->xOut(zMsg, pInfo->pOutArg);
          112  +  sqlite3_free(zMsg);
          113  +}
          114  +
          115  +/*
          116  +** Convert value rc into a string and print it using zFormat.  zFormat
          117  +** should have exactly one %s
          118  +*/
          119  +static void vfstrace_print_errcode(
          120  +  vfstrace_info *pInfo,
          121  +  const char *zFormat,
          122  +  int rc
          123  +){
          124  +  char zBuf[50];
          125  +  char *zVal;
          126  +  switch( rc ){
          127  +    case SQLITE_OK:         zVal = "SQLITE_OK";          break;
          128  +    case SQLITE_ERROR:      zVal = "SQLITE_ERROR";       break;
          129  +    case SQLITE_PERM:       zVal = "SQLITE_PERM";        break;
          130  +    case SQLITE_ABORT:      zVal = "SQLITE_ABORT";       break;
          131  +    case SQLITE_BUSY:       zVal = "SQLITE_BUSY";        break;
          132  +    case SQLITE_NOMEM:      zVal = "SQLITE_NOMEM";       break;
          133  +    case SQLITE_READONLY:   zVal = "SQLITE_READONLY";    break;
          134  +    case SQLITE_INTERRUPT:  zVal = "SQLITE_INTERRUPT";   break;
          135  +    case SQLITE_IOERR:      zVal = "SQLITE_IOERR";       break;
          136  +    case SQLITE_CORRUPT:    zVal = "SQLITE_CORRUPT";     break;
          137  +    case SQLITE_FULL:       zVal = "SQLITE_FULL";        break;
          138  +    case SQLITE_CANTOPEN:   zVal = "SQLITE_CANTOPEN";    break;
          139  +    case SQLITE_PROTOCOL:   zVal = "SQLITE_PROTOCOL";    break;
          140  +    case SQLITE_EMPTY:      zVal = "SQLITE_EMPTY";       break;
          141  +    case SQLITE_SCHEMA:     zVal = "SQLITE_SCHEMA";      break;
          142  +    case SQLITE_CONSTRAINT: zVal = "SQLITE_CONSTRAINT";  break;
          143  +    case SQLITE_MISMATCH:   zVal = "SQLITE_MISMATCH";    break;
          144  +    case SQLITE_MISUSE:     zVal = "SQLITE_MISUSE";      break;
          145  +    case SQLITE_NOLFS:      zVal = "SQLITE_NOLFS";       break;
          146  +    case SQLITE_IOERR_READ:         zVal = "SQLITE_IOERR_READ";         break;
          147  +    case SQLITE_IOERR_SHORT_READ:   zVal = "SQLITE_IOERR_SHORT_READ";   break;
          148  +    case SQLITE_IOERR_WRITE:        zVal = "SQLITE_IOERR_WRITE";        break;
          149  +    case SQLITE_IOERR_FSYNC:        zVal = "SQLITE_IOERR_FSYNC";        break;
          150  +    case SQLITE_IOERR_DIR_FSYNC:    zVal = "SQLITE_IOERR_DIR_FSYNC";    break;
          151  +    case SQLITE_IOERR_TRUNCATE:     zVal = "SQLITE_IOERR_TRUNCATE";     break;
          152  +    case SQLITE_IOERR_FSTAT:        zVal = "SQLITE_IOERR_FSTAT";        break;
          153  +    case SQLITE_IOERR_UNLOCK:       zVal = "SQLITE_IOERR_UNLOCK";       break;
          154  +    case SQLITE_IOERR_RDLOCK:       zVal = "SQLITE_IOERR_RDLOCK";       break;
          155  +    case SQLITE_IOERR_DELETE:       zVal = "SQLITE_IOERR_DELETE";       break;
          156  +    case SQLITE_IOERR_BLOCKED:      zVal = "SQLITE_IOERR_BLOCKED";      break;
          157  +    case SQLITE_IOERR_NOMEM:        zVal = "SQLITE_IOERR_NOMEM";        break;
          158  +    case SQLITE_IOERR_ACCESS:       zVal = "SQLITE_IOERR_ACCESS";       break;
          159  +    case SQLITE_IOERR_CHECKRESERVEDLOCK:
          160  +                               zVal = "SQLITE_IOERR_CHECKRESERVEDLOCK"; break;
          161  +    case SQLITE_IOERR_LOCK:         zVal = "SQLITE_IOERR_LOCK";         break;
          162  +    case SQLITE_IOERR_CLOSE:        zVal = "SQLITE_IOERR_CLOSE";        break;
          163  +    case SQLITE_IOERR_DIR_CLOSE:    zVal = "SQLITE_IOERR_DIR_CLOSE";    break;
          164  +    case SQLITE_IOERR_SHMOPEN:      zVal = "SQLITE_IOERR_SHMOPEN";      break;
          165  +    case SQLITE_IOERR_SHMSIZE:      zVal = "SQLITE_IOERR_SHMSIZE";      break;
          166  +    case SQLITE_IOERR_SHMLOCK:      zVal = "SQLITE_IOERR_SHMLOCK";      break;
          167  +    case SQLITE_LOCKED_SHAREDCACHE: zVal = "SQLITE_LOCKED_SHAREDCACHE"; break;
          168  +    case SQLITE_BUSY_RECOVERY:      zVal = "SQLITE_BUSY_RECOVERY";      break;
          169  +    case SQLITE_CANTOPEN_NOTEMPDIR: zVal = "SQLITE_CANTOPEN_NOTEMPDIR"; break;
          170  +    default: {
          171  +       sqlite3_snprintf(sizeof(zBuf), zBuf, "%d", rc);
          172  +       zVal = zBuf;
          173  +       break;
          174  +    }
          175  +  }
          176  +  vfstrace_printf(pInfo, zFormat, zVal);
          177  +}
          178  +
          179  +/*
          180  +** Close an vfstrace-file.
          181  +*/
          182  +static int vfstraceClose(sqlite3_file *pFile){
          183  +  vfstrace_file *p = (vfstrace_file *)pFile;
          184  +  vfstrace_info *pInfo = p->pInfo;
          185  +  int rc;
          186  +  vfstrace_printf(pInfo, "%s.xClose(%s)", pInfo->zVfsName, p->zFName);
          187  +  rc = p->pReal->pMethods->xClose(p->pReal);
          188  +  vfstrace_print_errcode(pInfo, " -> %s\n", rc);
          189  +  if( rc==SQLITE_OK ){
          190  +    sqlite3_free((void*)p->base.pMethods);
          191  +    p->base.pMethods = 0;
          192  +  }
          193  +  return rc;
          194  +}
          195  +
          196  +/*
          197  +** Read data from an vfstrace-file.
          198  +*/
          199  +static int vfstraceRead(
          200  +  sqlite3_file *pFile, 
          201  +  void *zBuf, 
          202  +  int iAmt, 
          203  +  sqlite_int64 iOfst
          204  +){
          205  +  vfstrace_file *p = (vfstrace_file *)pFile;
          206  +  vfstrace_info *pInfo = p->pInfo;
          207  +  int rc;
          208  +  vfstrace_printf(pInfo, "%s.xRead(%s,*,%d,%lld)", pInfo->zVfsName, p->zFName,
          209  +                  iAmt, iOfst);
          210  +  rc = p->pReal->pMethods->xRead(p->pReal, zBuf, iAmt, iOfst);
          211  +  vfstrace_print_errcode(pInfo, " -> %s\n", rc);
          212  +  return rc;
          213  +}
          214  +
          215  +/*
          216  +** Write data to an vfstrace-file.
          217  +*/
          218  +static int vfstraceWrite(
          219  +  sqlite3_file *pFile, 
          220  +  const void *zBuf, 
          221  +  int iAmt, 
          222  +  sqlite_int64 iOfst
          223  +){
          224  +  vfstrace_file *p = (vfstrace_file *)pFile;
          225  +  vfstrace_info *pInfo = p->pInfo;
          226  +  int rc;
          227  +  vfstrace_printf(pInfo, "%s.xWrite(%s,*,%d,%lld)", pInfo->zVfsName, p->zFName,
          228  +                  iAmt, iOfst);
          229  +  rc = p->pReal->pMethods->xWrite(p->pReal, zBuf, iAmt, iOfst);
          230  +  vfstrace_print_errcode(pInfo, " -> %s\n", rc);
          231  +  return rc;
          232  +}
          233  +
          234  +/*
          235  +** Truncate an vfstrace-file.
          236  +*/
          237  +static int vfstraceTruncate(sqlite3_file *pFile, sqlite_int64 size){
          238  +  vfstrace_file *p = (vfstrace_file *)pFile;
          239  +  vfstrace_info *pInfo = p->pInfo;
          240  +  int rc;
          241  +  vfstrace_printf(pInfo, "%s.xTruncate(%s,%lld)", pInfo->zVfsName, p->zFName,
          242  +                  size);
          243  +  rc = p->pReal->pMethods->xTruncate(p->pReal, size);
          244  +  vfstrace_printf(pInfo, " -> %d\n", rc);
          245  +  return rc;
          246  +}
          247  +
          248  +/*
          249  +** Sync an vfstrace-file.
          250  +*/
          251  +static int vfstraceSync(sqlite3_file *pFile, int flags){
          252  +  vfstrace_file *p = (vfstrace_file *)pFile;
          253  +  vfstrace_info *pInfo = p->pInfo;
          254  +  int rc;
          255  +  vfstrace_printf(pInfo, "%s.xSync(%s,%d)", pInfo->zVfsName, p->zFName, flags);
          256  +  rc = p->pReal->pMethods->xSync(p->pReal, flags);
          257  +  vfstrace_printf(pInfo, " -> %d\n", rc);
          258  +  return rc;
          259  +}
          260  +
          261  +/*
          262  +** Return the current file-size of an vfstrace-file.
          263  +*/
          264  +static int vfstraceFileSize(sqlite3_file *pFile, sqlite_int64 *pSize){
          265  +  vfstrace_file *p = (vfstrace_file *)pFile;
          266  +  vfstrace_info *pInfo = p->pInfo;
          267  +  int rc;
          268  +  vfstrace_printf(pInfo, "%s.xFileSize(%s)", pInfo->zVfsName, p->zFName);
          269  +  rc = p->pReal->pMethods->xFileSize(p->pReal, pSize);
          270  +  vfstrace_print_errcode(pInfo, " -> %s,", rc);
          271  +  vfstrace_printf(pInfo, " size=%lld\n", *pSize);
          272  +  return rc;
          273  +}
          274  +
          275  +/*
          276  +** Lock an vfstrace-file.
          277  +*/
          278  +static int vfstraceLock(sqlite3_file *pFile, int eLock){
          279  +  vfstrace_file *p = (vfstrace_file *)pFile;
          280  +  vfstrace_info *pInfo = p->pInfo;
          281  +  int rc;
          282  +  vfstrace_printf(pInfo, "%s.xLock(%s,%d)", pInfo->zVfsName, p->zFName, eLock);
          283  +  rc = p->pReal->pMethods->xLock(p->pReal, eLock);
          284  +  vfstrace_print_errcode(pInfo, " -> %s\n", rc);
          285  +  return rc;
          286  +}
          287  +
          288  +/*
          289  +** Unlock an vfstrace-file.
          290  +*/
          291  +static int vfstraceUnlock(sqlite3_file *pFile, int eLock){
          292  +  vfstrace_file *p = (vfstrace_file *)pFile;
          293  +  vfstrace_info *pInfo = p->pInfo;
          294  +  int rc;
          295  +  vfstrace_printf(pInfo, "%s.xUnlock(%s,%d)", pInfo->zVfsName, p->zFName,eLock);
          296  +  rc = p->pReal->pMethods->xUnlock(p->pReal, eLock);
          297  +  vfstrace_print_errcode(pInfo, " -> %s\n", rc);
          298  +  return rc;
          299  +}
          300  +
          301  +/*
          302  +** Check if another file-handle holds a RESERVED lock on an vfstrace-file.
          303  +*/
          304  +static int vfstraceCheckReservedLock(sqlite3_file *pFile, int *pResOut){
          305  +  vfstrace_file *p = (vfstrace_file *)pFile;
          306  +  vfstrace_info *pInfo = p->pInfo;
          307  +  int rc;
          308  +  vfstrace_printf(pInfo, "%s.xCheckReservedLock(%s,%d)", 
          309  +                  pInfo->zVfsName, p->zFName);
          310  +  rc = p->pReal->pMethods->xCheckReservedLock(p->pReal, pResOut);
          311  +  vfstrace_print_errcode(pInfo, " -> %s", rc);
          312  +  vfstrace_printf(pInfo, ", out=%d\n", *pResOut);
          313  +  return rc;
          314  +}
          315  +
          316  +/*
          317  +** File control method. For custom operations on an vfstrace-file.
          318  +*/
          319  +static int vfstraceFileControl(sqlite3_file *pFile, int op, void *pArg){
          320  +  vfstrace_file *p = (vfstrace_file *)pFile;
          321  +  vfstrace_info *pInfo = p->pInfo;
          322  +  int rc;
          323  +  vfstrace_printf(pInfo, "%s.xFileControl(%s,op=%d)",
          324  +                  pInfo->zVfsName, p->zFName, op);
          325  +  rc = p->pReal->pMethods->xFileControl(p->pReal, op, pArg);
          326  +  vfstrace_print_errcode(pInfo, " -> %s\n", rc);
          327  +  return rc;
          328  +}
          329  +
          330  +/*
          331  +** Return the sector-size in bytes for an vfstrace-file.
          332  +*/
          333  +static int vfstraceSectorSize(sqlite3_file *pFile){
          334  +  vfstrace_file *p = (vfstrace_file *)pFile;
          335  +  vfstrace_info *pInfo = p->pInfo;
          336  +  int rc;
          337  +  vfstrace_printf(pInfo, "%s.xSectorSize(%s)", pInfo->zVfsName, p->zFName);
          338  +  rc = p->pReal->pMethods->xSectorSize(p->pReal);
          339  +  vfstrace_printf(pInfo, " -> %d\n", rc);
          340  +  return rc;
          341  +}
          342  +
          343  +/*
          344  +** Return the device characteristic flags supported by an vfstrace-file.
          345  +*/
          346  +static int vfstraceDeviceCharacteristics(sqlite3_file *pFile){
          347  +  vfstrace_file *p = (vfstrace_file *)pFile;
          348  +  vfstrace_info *pInfo = p->pInfo;
          349  +  int rc;
          350  +  vfstrace_printf(pInfo, "%s.xDeviceCharacteristics(%s)",
          351  +                  pInfo->zVfsName, p->zFName);
          352  +  rc = p->pReal->pMethods->xDeviceCharacteristics(p->pReal);
          353  +  vfstrace_printf(pInfo, " -> 0x%08x\n", rc);
          354  +  return rc;
          355  +}
          356  +
          357  +/*
          358  +** Shared-memory operations.
          359  +*/
          360  +static int vfstraceShmLock(sqlite3_file *pFile, int ofst, int n, int flags){
          361  +  vfstrace_file *p = (vfstrace_file *)pFile;
          362  +  vfstrace_info *pInfo = p->pInfo;
          363  +  int rc;
          364  +  vfstrace_printf(pInfo, "%s.xShmLock(%s,ofst=%d,n=%d,flags=%d)",
          365  +                  pInfo->zVfsName, p->zFName, ofst, n, flags);
          366  +  rc = p->pReal->pMethods->xShmLock(p->pReal, ofst, n, flags);
          367  +  vfstrace_print_errcode(pInfo, " -> %s\n", rc);
          368  +  return rc;
          369  +}
          370  +static int vfstraceShmMap(
          371  +  sqlite3_file *pFile, 
          372  +  int iRegion, 
          373  +  int szRegion, 
          374  +  int isWrite, 
          375  +  void volatile **pp
          376  +){
          377  +  vfstrace_file *p = (vfstrace_file *)pFile;
          378  +  vfstrace_info *pInfo = p->pInfo;
          379  +  int rc;
          380  +  vfstrace_printf(pInfo, "%s.xShmMap(%s,iRegion=%d,szRegion=%d,isWrite=%d,*)",
          381  +                  pInfo->zVfsName, p->zFName, iRegion, szRegion, isWrite);
          382  +  rc = p->pReal->pMethods->xShmMap(p->pReal, iRegion, szRegion, isWrite, pp);
          383  +  vfstrace_print_errcode(pInfo, " -> %s\n", rc);
          384  +  return rc;
          385  +}
          386  +static void vfstraceShmBarrier(sqlite3_file *pFile){
          387  +  vfstrace_file *p = (vfstrace_file *)pFile;
          388  +  vfstrace_info *pInfo = p->pInfo;
          389  +  vfstrace_printf(pInfo, "%s.xShmBarrier(%s)\n", pInfo->zVfsName, p->zFName);
          390  +  p->pReal->pMethods->xShmBarrier(p->pReal);
          391  +}
          392  +static int vfstraceShmUnmap(sqlite3_file *pFile, int delFlag){
          393  +  vfstrace_file *p = (vfstrace_file *)pFile;
          394  +  vfstrace_info *pInfo = p->pInfo;
          395  +  int rc;
          396  +  vfstrace_printf(pInfo, "%s.xShmUnmap(%s,delFlag=%d)",
          397  +                  pInfo->zVfsName, p->zFName, delFlag);
          398  +  rc = p->pReal->pMethods->xShmUnmap(p->pReal, delFlag);
          399  +  vfstrace_print_errcode(pInfo, " -> %s\n", rc);
          400  +  return rc;
          401  +}
          402  +
          403  +
          404  +
          405  +/*
          406  +** Open an vfstrace file handle.
          407  +*/
          408  +static int vfstraceOpen(
          409  +  sqlite3_vfs *pVfs,
          410  +  const char *zName,
          411  +  sqlite3_file *pFile,
          412  +  int flags,
          413  +  int *pOutFlags
          414  +){
          415  +  int rc;
          416  +  vfstrace_file *p = (vfstrace_file *)pFile;
          417  +  vfstrace_info *pInfo = (vfstrace_info*)pVfs->pAppData;
          418  +  sqlite3_vfs *pRoot = pInfo->pRootVfs;
          419  +  p->pInfo = pInfo;
          420  +  p->zFName = fileTail(zName);
          421  +  p->pReal = (sqlite3_file *)&p[1];
          422  +  rc = pRoot->xOpen(pRoot, zName, p->pReal, flags, pOutFlags);
          423  +  vfstrace_printf(pInfo, "%s.xOpen(%s,flags=0x%x)",
          424  +                  pInfo->zVfsName, p->zFName, flags);
          425  +  if( p->pReal->pMethods ){
          426  +    sqlite3_io_methods *pNew = sqlite3_malloc( sizeof(*pNew) );
          427  +    const sqlite3_io_methods *pSub = p->pReal->pMethods;
          428  +    memset(pNew, 0, sizeof(*pNew));
          429  +    pNew->iVersion = pSub->iVersion;
          430  +    pNew->xClose = vfstraceClose;
          431  +    pNew->xRead = vfstraceRead;
          432  +    pNew->xWrite = vfstraceWrite;
          433  +    pNew->xTruncate = vfstraceTruncate;
          434  +    pNew->xSync = vfstraceSync;
          435  +    pNew->xFileSize = vfstraceFileSize;
          436  +    pNew->xLock = vfstraceLock;
          437  +    pNew->xUnlock = vfstraceUnlock;
          438  +    pNew->xCheckReservedLock = vfstraceCheckReservedLock;
          439  +    pNew->xFileControl = vfstraceFileControl;
          440  +    pNew->xSectorSize = vfstraceSectorSize;
          441  +    pNew->xDeviceCharacteristics = vfstraceDeviceCharacteristics;
          442  +    if( pNew->iVersion>=2 ){
          443  +      pNew->xShmMap = pSub->xShmMap ? vfstraceShmMap : 0;
          444  +      pNew->xShmLock = pSub->xShmLock ? vfstraceShmLock : 0;
          445  +      pNew->xShmBarrier = pSub->xShmBarrier ? vfstraceShmBarrier : 0;
          446  +      pNew->xShmUnmap = pSub->xShmUnmap ? vfstraceShmUnmap : 0;
          447  +    }
          448  +    pFile->pMethods = pNew;
          449  +  }
          450  +  vfstrace_print_errcode(pInfo, " -> %s", rc);
          451  +  vfstrace_printf(pInfo, ", outFlags=0x%x\n", *pOutFlags);
          452  +  return rc;
          453  +}
          454  +
          455  +/*
          456  +** Delete the file located at zPath. If the dirSync argument is true,
          457  +** ensure the file-system modifications are synced to disk before
          458  +** returning.
          459  +*/
          460  +static int vfstraceDelete(sqlite3_vfs *pVfs, const char *zPath, int dirSync){
          461  +  vfstrace_info *pInfo = (vfstrace_info*)pVfs->pAppData;
          462  +  sqlite3_vfs *pRoot = pInfo->pRootVfs;
          463  +  int rc;
          464  +  vfstrace_printf(pInfo, "%s.xDelete(\"%s\",%d)",
          465  +                  pInfo->zVfsName, zPath, dirSync);
          466  +  rc = pRoot->xDelete(pRoot, zPath, dirSync);
          467  +  vfstrace_print_errcode(pInfo, " -> %s\n", rc);
          468  +  return rc;
          469  +}
          470  +
          471  +/*
          472  +** Test for access permissions. Return true if the requested permission
          473  +** is available, or false otherwise.
          474  +*/
          475  +static int vfstraceAccess(
          476  +  sqlite3_vfs *pVfs, 
          477  +  const char *zPath, 
          478  +  int flags, 
          479  +  int *pResOut
          480  +){
          481  +  vfstrace_info *pInfo = (vfstrace_info*)pVfs->pAppData;
          482  +  sqlite3_vfs *pRoot = pInfo->pRootVfs;
          483  +  int rc;
          484  +  vfstrace_printf(pInfo, "%s.xDelete(\"%s\",%d)",
          485  +                  pInfo->zVfsName, zPath, flags);
          486  +  rc = pRoot->xAccess(pRoot, zPath, flags, pResOut);
          487  +  vfstrace_print_errcode(pInfo, " -> %s", rc);
          488  +  vfstrace_printf(pInfo, ", out=%d\n", *pResOut);
          489  +  return rc;
          490  +}
          491  +
          492  +/*
          493  +** Populate buffer zOut with the full canonical pathname corresponding
          494  +** to the pathname in zPath. zOut is guaranteed to point to a buffer
          495  +** of at least (DEVSYM_MAX_PATHNAME+1) bytes.
          496  +*/
          497  +static int vfstraceFullPathname(
          498  +  sqlite3_vfs *pVfs, 
          499  +  const char *zPath, 
          500  +  int nOut, 
          501  +  char *zOut
          502  +){
          503  +  vfstrace_info *pInfo = (vfstrace_info*)pVfs->pAppData;
          504  +  sqlite3_vfs *pRoot = pInfo->pRootVfs;
          505  +  int rc;
          506  +  vfstrace_printf(pInfo, "%s.xFullPathname(\"%s\")",
          507  +                  pInfo->zVfsName, zPath);
          508  +  rc = pRoot->xFullPathname(pRoot, zPath, nOut, zOut);
          509  +  vfstrace_print_errcode(pInfo, " -> %s", rc);
          510  +  vfstrace_printf(pInfo, ", out=\"%.*s\"\n", nOut, zOut);
          511  +  return rc;
          512  +}
          513  +
          514  +/*
          515  +** Open the dynamic library located at zPath and return a handle.
          516  +*/
          517  +static void *vfstraceDlOpen(sqlite3_vfs *pVfs, const char *zPath){
          518  +  vfstrace_info *pInfo = (vfstrace_info*)pVfs->pAppData;
          519  +  sqlite3_vfs *pRoot = pInfo->pRootVfs;
          520  +  vfstrace_printf(pInfo, "%s.xDlOpen(\"%s\")\n", pInfo->zVfsName, zPath);
          521  +  return pRoot->xDlOpen(pRoot, zPath);
          522  +}
          523  +
          524  +/*
          525  +** Populate the buffer zErrMsg (size nByte bytes) with a human readable
          526  +** utf-8 string describing the most recent error encountered associated 
          527  +** with dynamic libraries.
          528  +*/
          529  +static void vfstraceDlError(sqlite3_vfs *pVfs, int nByte, char *zErrMsg){
          530  +  vfstrace_info *pInfo = (vfstrace_info*)pVfs->pAppData;
          531  +  sqlite3_vfs *pRoot = pInfo->pRootVfs;
          532  +  vfstrace_printf(pInfo, "%s.xDlError(%d)", pInfo->zVfsName, nByte);
          533  +  pRoot->xDlError(pRoot, nByte, zErrMsg);
          534  +  vfstrace_printf(pInfo, " -> \"%s\"", zErrMsg);
          535  +}
          536  +
          537  +/*
          538  +** Return a pointer to the symbol zSymbol in the dynamic library pHandle.
          539  +*/
          540  +static void (*vfstraceDlSym(sqlite3_vfs *pVfs,void *p,const char *zSym))(void){
          541  +  vfstrace_info *pInfo = (vfstrace_info*)pVfs->pAppData;
          542  +  sqlite3_vfs *pRoot = pInfo->pRootVfs;
          543  +  vfstrace_printf(pInfo, "%s.xDlSym(\"%s\")\n", pInfo->zVfsName, zSym);
          544  +  return pRoot->xDlSym(pRoot, p, zSym);
          545  +}
          546  +
          547  +/*
          548  +** Close the dynamic library handle pHandle.
          549  +*/
          550  +static void vfstraceDlClose(sqlite3_vfs *pVfs, void *pHandle){
          551  +  vfstrace_info *pInfo = (vfstrace_info*)pVfs->pAppData;
          552  +  sqlite3_vfs *pRoot = pInfo->pRootVfs;
          553  +  vfstrace_printf(pInfo, "%s.xDlOpen()\n", pInfo->zVfsName);
          554  +  pRoot->xDlClose(pRoot, pHandle);
          555  +}
          556  +
          557  +/*
          558  +** Populate the buffer pointed to by zBufOut with nByte bytes of 
          559  +** random data.
          560  +*/
          561  +static int vfstraceRandomness(sqlite3_vfs *pVfs, int nByte, char *zBufOut){
          562  +  vfstrace_info *pInfo = (vfstrace_info*)pVfs->pAppData;
          563  +  sqlite3_vfs *pRoot = pInfo->pRootVfs;
          564  +  vfstrace_printf(pInfo, "%s.xRandomness(%d)\n", pInfo->zVfsName, nByte);
          565  +  return pRoot->xRandomness(pRoot, nByte, zBufOut);
          566  +}
          567  +
          568  +/*
          569  +** Sleep for nMicro microseconds. Return the number of microseconds 
          570  +** actually slept.
          571  +*/
          572  +static int vfstraceSleep(sqlite3_vfs *pVfs, int nMicro){
          573  +  vfstrace_info *pInfo = (vfstrace_info*)pVfs->pAppData;
          574  +  sqlite3_vfs *pRoot = pInfo->pRootVfs;
          575  +  return pRoot->xSleep(pRoot, nMicro);
          576  +}
          577  +
          578  +/*
          579  +** Return the current time as a Julian Day number in *pTimeOut.
          580  +*/
          581  +static int vfstraceCurrentTime(sqlite3_vfs *pVfs, double *pTimeOut){
          582  +  vfstrace_info *pInfo = (vfstrace_info*)pVfs->pAppData;
          583  +  sqlite3_vfs *pRoot = pInfo->pRootVfs;
          584  +  return pRoot->xCurrentTime(pRoot, pTimeOut);
          585  +}
          586  +static int vfstraceCurrentTimeInt64(sqlite3_vfs *pVfs, sqlite3_int64 *pTimeOut){
          587  +  vfstrace_info *pInfo = (vfstrace_info*)pVfs->pAppData;
          588  +  sqlite3_vfs *pRoot = pInfo->pRootVfs;
          589  +  return pRoot->xCurrentTimeInt64(pRoot, pTimeOut);
          590  +}
          591  +
          592  +/*
          593  +** Return th3 emost recent error code and message
          594  +*/
          595  +static int vfstraceGetLastError(sqlite3_vfs *pVfs, int iErr, char *zErr){
          596  +  vfstrace_info *pInfo = (vfstrace_info*)pVfs->pAppData;
          597  +  sqlite3_vfs *pRoot = pInfo->pRootVfs;
          598  +  return pRoot->xGetLastError(pRoot, iErr, zErr);
          599  +}
          600  +
          601  +/*
          602  +** Override system calls.
          603  +*/
          604  +static int vfstraceSetSystemCall(
          605  +  sqlite3_vfs *pVfs,
          606  +  const char *zName,
          607  +  void *pFunc
          608  +){
          609  +  vfstrace_info *pInfo = (vfstrace_info*)pVfs->pAppData;
          610  +  sqlite3_vfs *pRoot = pInfo->pRootVfs;
          611  +  return pRoot->xSetSystemCall(pRoot, zName, pFunc);
          612  +}
          613  +static void *vfstraceGetSystemCall(sqlite3_vfs *pVfs, const char *zName){
          614  +  vfstrace_info *pInfo = (vfstrace_info*)pVfs->pAppData;
          615  +  sqlite3_vfs *pRoot = pInfo->pRootVfs;
          616  +  return pRoot->xGetSystemCall(pRoot, zName);
          617  +}
          618  +static const char *vfstraceNextSystemCall(sqlite3_vfs *pVfs, const char *zName){
          619  +  vfstrace_info *pInfo = (vfstrace_info*)pVfs->pAppData;
          620  +  sqlite3_vfs *pRoot = pInfo->pRootVfs;
          621  +  return pRoot->xNextSystemCall(pRoot, zName);
          622  +}
          623  +
          624  +
          625  +/*
          626  +** Clients invoke this routine to construct a new trace-vfs shim.
          627  +**
          628  +** Return SQLITE_OK on success.  
          629  +**
          630  +** SQLITE_NOMEM is returned in the case of a memory allocation error.
          631  +** SQLITE_NOTFOUND is returned if zOldVfsName does not exist.
          632  +*/
          633  +int vfstrace_register(
          634  +   const char *zTraceName,           /* Name of the newly constructed VFS */
          635  +   const char *zOldVfsName,          /* Name of the underlying VFS */
          636  +   int (*xOut)(const char*,void*),   /* Output routine.  ex: fputs */
          637  +   void *pOutArg,                    /* 2nd argument to xOut.  ex: stderr */
          638  +   int makeDefault                   /* True to make the new VFS the default */
          639  +){
          640  +  sqlite3_vfs *pNew;
          641  +  sqlite3_vfs *pRoot;
          642  +  vfstrace_info *pInfo;
          643  +  int nName;
          644  +  int nByte;
          645  +
          646  +  pRoot = sqlite3_vfs_find(zOldVfsName);
          647  +  if( pRoot==0 ) return SQLITE_NOTFOUND;
          648  +  nName = strlen(zTraceName);
          649  +  nByte = sizeof(*pNew) + sizeof(*pInfo) + nName + 1;
          650  +  pNew = sqlite3_malloc( nByte );
          651  +  if( pNew==0 ) return SQLITE_NOMEM;
          652  +  memset(pNew, 0, nByte);
          653  +  pInfo = (vfstrace_info*)&pNew[1];
          654  +  pNew->iVersion = pRoot->iVersion;
          655  +  pNew->szOsFile = pRoot->szOsFile + sizeof(vfstrace_file);
          656  +  pNew->mxPathname = pRoot->mxPathname;
          657  +  pNew->zName = (char*)&pInfo[1];
          658  +  memcpy((char*)&pInfo[1], zTraceName, nName+1);
          659  +  pNew->pAppData = pInfo;
          660  +  pNew->xOpen = vfstraceOpen;
          661  +  pNew->xDelete = vfstraceDelete;
          662  +  pNew->xAccess = vfstraceAccess;
          663  +  pNew->xFullPathname = vfstraceFullPathname;
          664  +  pNew->xDlOpen = pRoot->xDlOpen==0 ? 0 : vfstraceDlOpen;
          665  +  pNew->xDlError = pRoot->xDlError==0 ? 0 : vfstraceDlError;
          666  +  pNew->xDlSym = pRoot->xDlSym==0 ? 0 : vfstraceDlSym;
          667  +  pNew->xDlClose = pRoot->xDlClose==0 ? 0 : vfstraceDlClose;
          668  +  pNew->xRandomness = vfstraceRandomness;
          669  +  pNew->xSleep = vfstraceSleep;
          670  +  pNew->xCurrentTime = vfstraceCurrentTime;
          671  +  pNew->xGetLastError = pRoot->xGetLastError==0 ? 0 : vfstraceGetLastError;
          672  +  if( pNew->iVersion>=2 ){
          673  +    pNew->xCurrentTimeInt64 = pRoot->xCurrentTimeInt64==0 ? 0 :
          674  +                                   vfstraceCurrentTimeInt64;
          675  +    if( pNew->iVersion>=3 ){
          676  +      pNew->xSetSystemCall = pRoot->xSetSystemCall==0 ? 0 : 
          677  +                                   vfstraceSetSystemCall;
          678  +      pNew->xGetSystemCall = pRoot->xGetSystemCall==0 ? 0 : 
          679  +                                   vfstraceGetSystemCall;
          680  +      pNew->xNextSystemCall = pRoot->xNextSystemCall==0 ? 0 : 
          681  +                                   vfstraceNextSystemCall;
          682  +    }
          683  +  }
          684  +  pInfo->pRootVfs = pRoot;
          685  +  pInfo->xOut = xOut;
          686  +  pInfo->pOutArg = pOutArg;
          687  +  pInfo->zVfsName = pNew->zName;
          688  +  pInfo->pTraceVfs = pNew;
          689  +  vfstrace_printf(pInfo, "%s.enabled_for(\"%s\")\n",
          690  +       pInfo->zVfsName, pRoot->zName);
          691  +  return sqlite3_vfs_register(pNew, makeDefault);
          692  +}