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| 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 ** USAGE: | |
| 17 ** | |
| 18 ** This source file exports a single symbol which is the name of a | |
| 19 ** function: | |
| 20 ** | |
| 21 ** int vfstrace_register( | |
| 22 ** const char *zTraceName, // Name of the newly constructed VFS | |
| 23 ** const char *zOldVfsName, // Name of the underlying VFS | |
| 24 ** int (*xOut)(const char*,void*), // Output routine. ex: fputs | |
| 25 ** void *pOutArg, // 2nd argument to xOut. ex: stderr | |
| 26 ** int makeDefault // Make the new VFS the default | |
| 27 ** ); | |
| 28 ** | |
| 29 ** Applications that want to trace their VFS usage must provide a callback | |
| 30 ** function with this prototype: | |
| 31 ** | |
| 32 ** int traceOutput(const char *zMessage, void *pAppData); | |
| 33 ** | |
| 34 ** This function will "output" the trace messages, where "output" can | |
| 35 ** mean different things to different applications. The traceOutput function | |
| 36 ** for the command-line shell (see shell.c) is "fputs" from the standard | |
| 37 ** library, which means that all trace output is written on the stream | |
| 38 ** specified by the second argument. In the case of the command-line shell | |
| 39 ** the second argument is stderr. Other applications might choose to output | |
| 40 ** trace information to a file, over a socket, or write it into a buffer. | |
| 41 ** | |
| 42 ** The vfstrace_register() function creates a new "shim" VFS named by | |
| 43 ** the zTraceName parameter. A "shim" VFS is an SQLite backend that does | |
| 44 ** not really perform the duties of a true backend, but simply filters or | |
| 45 ** interprets VFS calls before passing them off to another VFS which does | |
| 46 ** the actual work. In this case the other VFS - the one that does the | |
| 47 ** real work - is identified by the second parameter, zOldVfsName. If | |
| 48 ** the 2nd parameter is NULL then the default VFS is used. The common | |
| 49 ** case is for the 2nd parameter to be NULL. | |
| 50 ** | |
| 51 ** The third and fourth parameters are the pointer to the output function | |
| 52 ** and the second argument to the output function. For the SQLite | |
| 53 ** command-line shell, when the -vfstrace option is used, these parameters | |
| 54 ** are fputs and stderr, respectively. | |
| 55 ** | |
| 56 ** The fifth argument is true (non-zero) to cause the newly created VFS | |
| 57 ** to become the default VFS. The common case is for the fifth parameter | |
| 58 ** to be true. | |
| 59 ** | |
| 60 ** The call to vfstrace_register() simply creates the shim VFS that does | |
| 61 ** tracing. The application must also arrange to use the new VFS for | |
| 62 ** all database connections that are created and for which tracing is | |
| 63 ** desired. This can be done by specifying the trace VFS using URI filename | |
| 64 ** notation, or by specifying the trace VFS as the 4th parameter to | |
| 65 ** sqlite3_open_v2() or by making the trace VFS be the default (by setting | |
| 66 ** the 5th parameter of vfstrace_register() to 1). | |
| 67 ** | |
| 68 ** | |
| 69 ** ENABLING VFSTRACE IN A COMMAND-LINE SHELL | |
| 70 ** | |
| 71 ** The SQLite command line shell implemented by the shell.c source file | |
| 72 ** can be used with this module. To compile in -vfstrace support, first | |
| 73 ** gather this file (test_vfstrace.c), the shell source file (shell.c), | |
| 74 ** and the SQLite amalgamation source files (sqlite3.c, sqlite3.h) into | |
| 75 ** the working directory. Then compile using a command like the following: | |
| 76 ** | |
| 77 ** gcc -o sqlite3 -Os -I. -DSQLITE_ENABLE_VFSTRACE \ | |
| 78 ** -DSQLITE_THREADSAFE=0 -DSQLITE_ENABLE_FTS3 -DSQLITE_ENABLE_RTREE \ | |
| 79 ** -DHAVE_READLINE -DHAVE_USLEEP=1 \ | |
| 80 ** shell.c test_vfstrace.c sqlite3.c -ldl -lreadline -lncurses | |
| 81 ** | |
| 82 ** The gcc command above works on Linux and provides (in addition to the | |
| 83 ** -vfstrace option) support for FTS3 and FTS4, RTREE, and command-line | |
| 84 ** editing using the readline library. The command-line shell does not | |
| 85 ** use threads so we added -DSQLITE_THREADSAFE=0 just to make the code | |
| 86 ** run a little faster. For compiling on a Mac, you'll probably need | |
| 87 ** to omit the -DHAVE_READLINE, the -lreadline, and the -lncurses options. | |
| 88 ** The compilation could be simplified to just this: | |
| 89 ** | |
| 90 ** gcc -DSQLITE_ENABLE_VFSTRACE \ | |
| 91 ** shell.c test_vfstrace.c sqlite3.c -ldl -lpthread | |
| 92 ** | |
| 93 ** In this second example, all unnecessary options have been removed | |
| 94 ** Note that since the code is now threadsafe, we had to add the -lpthread | |
| 95 ** option to pull in the pthreads library. | |
| 96 ** | |
| 97 ** To cross-compile for windows using MinGW, a command like this might | |
| 98 ** work: | |
| 99 ** | |
| 100 ** /opt/mingw/bin/i386-mingw32msvc-gcc -o sqlite3.exe -Os -I \ | |
| 101 ** -DSQLITE_THREADSAFE=0 -DSQLITE_ENABLE_VFSTRACE \ | |
| 102 ** shell.c test_vfstrace.c sqlite3.c | |
| 103 ** | |
| 104 ** Similar compiler commands will work on different systems. The key | |
| 105 ** invariants are (1) you must have -DSQLITE_ENABLE_VFSTRACE so that | |
| 106 ** the shell.c source file will know to include the -vfstrace command-line | |
| 107 ** option and (2) you must compile and link the three source files | |
| 108 ** shell,c, test_vfstrace.c, and sqlite3.c. | |
| 109 */ | |
| 110 #include <stdlib.h> | |
| 111 #include <string.h> | |
| 112 #include "sqlite3.h" | |
| 113 | |
| 114 /* | |
| 115 ** An instance of this structure is attached to the each trace VFS to | |
| 116 ** provide auxiliary information. | |
| 117 */ | |
| 118 typedef struct vfstrace_info vfstrace_info; | |
| 119 struct vfstrace_info { | |
| 120 sqlite3_vfs *pRootVfs; /* The underlying real VFS */ | |
| 121 int (*xOut)(const char*, void*); /* Send output here */ | |
| 122 void *pOutArg; /* First argument to xOut */ | |
| 123 const char *zVfsName; /* Name of this trace-VFS */ | |
| 124 sqlite3_vfs *pTraceVfs; /* Pointer back to the trace VFS */ | |
| 125 }; | |
| 126 | |
| 127 /* | |
| 128 ** The sqlite3_file object for the trace VFS | |
| 129 */ | |
| 130 typedef struct vfstrace_file vfstrace_file; | |
| 131 struct vfstrace_file { | |
| 132 sqlite3_file base; /* Base class. Must be first */ | |
| 133 vfstrace_info *pInfo; /* The trace-VFS to which this file belongs */ | |
| 134 const char *zFName; /* Base name of the file */ | |
| 135 sqlite3_file *pReal; /* The real underlying file */ | |
| 136 }; | |
| 137 | |
| 138 /* | |
| 139 ** Method declarations for vfstrace_file. | |
| 140 */ | |
| 141 static int vfstraceClose(sqlite3_file*); | |
| 142 static int vfstraceRead(sqlite3_file*, void*, int iAmt, sqlite3_int64 iOfst); | |
| 143 static int vfstraceWrite(sqlite3_file*,const void*,int iAmt, sqlite3_int64); | |
| 144 static int vfstraceTruncate(sqlite3_file*, sqlite3_int64 size); | |
| 145 static int vfstraceSync(sqlite3_file*, int flags); | |
| 146 static int vfstraceFileSize(sqlite3_file*, sqlite3_int64 *pSize); | |
| 147 static int vfstraceLock(sqlite3_file*, int); | |
| 148 static int vfstraceUnlock(sqlite3_file*, int); | |
| 149 static int vfstraceCheckReservedLock(sqlite3_file*, int *); | |
| 150 static int vfstraceFileControl(sqlite3_file*, int op, void *pArg); | |
| 151 static int vfstraceSectorSize(sqlite3_file*); | |
| 152 static int vfstraceDeviceCharacteristics(sqlite3_file*); | |
| 153 static int vfstraceShmLock(sqlite3_file*,int,int,int); | |
| 154 static int vfstraceShmMap(sqlite3_file*,int,int,int, void volatile **); | |
| 155 static void vfstraceShmBarrier(sqlite3_file*); | |
| 156 static int vfstraceShmUnmap(sqlite3_file*,int); | |
| 157 | |
| 158 /* | |
| 159 ** Method declarations for vfstrace_vfs. | |
| 160 */ | |
| 161 static int vfstraceOpen(sqlite3_vfs*, const char *, sqlite3_file*, int , int *); | |
| 162 static int vfstraceDelete(sqlite3_vfs*, const char *zName, int syncDir); | |
| 163 static int vfstraceAccess(sqlite3_vfs*, const char *zName, int flags, int *); | |
| 164 static int vfstraceFullPathname(sqlite3_vfs*, const char *zName, int, char *); | |
| 165 static void *vfstraceDlOpen(sqlite3_vfs*, const char *zFilename); | |
| 166 static void vfstraceDlError(sqlite3_vfs*, int nByte, char *zErrMsg); | |
| 167 static void (*vfstraceDlSym(sqlite3_vfs*,void*, const char *zSymbol))(void); | |
| 168 static void vfstraceDlClose(sqlite3_vfs*, void*); | |
| 169 static int vfstraceRandomness(sqlite3_vfs*, int nByte, char *zOut); | |
| 170 static int vfstraceSleep(sqlite3_vfs*, int microseconds); | |
| 171 static int vfstraceCurrentTime(sqlite3_vfs*, double*); | |
| 172 static int vfstraceGetLastError(sqlite3_vfs*, int, char*); | |
| 173 static int vfstraceCurrentTimeInt64(sqlite3_vfs*, sqlite3_int64*); | |
| 174 static int vfstraceSetSystemCall(sqlite3_vfs*,const char*, sqlite3_syscall_ptr); | |
| 175 static sqlite3_syscall_ptr vfstraceGetSystemCall(sqlite3_vfs*, const char *); | |
| 176 static const char *vfstraceNextSystemCall(sqlite3_vfs*, const char *zName); | |
| 177 | |
| 178 /* | |
| 179 ** Return a pointer to the tail of the pathname. Examples: | |
| 180 ** | |
| 181 ** /home/drh/xyzzy.txt -> xyzzy.txt | |
| 182 ** xyzzy.txt -> xyzzy.txt | |
| 183 */ | |
| 184 static const char *fileTail(const char *z){ | |
| 185 int i; | |
| 186 if( z==0 ) return 0; | |
| 187 i = strlen(z)-1; | |
| 188 while( i>0 && z[i-1]!='/' ){ i--; } | |
| 189 return &z[i]; | |
| 190 } | |
| 191 | |
| 192 /* | |
| 193 ** Send trace output defined by zFormat and subsequent arguments. | |
| 194 */ | |
| 195 static void vfstrace_printf( | |
| 196 vfstrace_info *pInfo, | |
| 197 const char *zFormat, | |
| 198 ... | |
| 199 ){ | |
| 200 va_list ap; | |
| 201 char *zMsg; | |
| 202 va_start(ap, zFormat); | |
| 203 zMsg = sqlite3_vmprintf(zFormat, ap); | |
| 204 va_end(ap); | |
| 205 pInfo->xOut(zMsg, pInfo->pOutArg); | |
| 206 sqlite3_free(zMsg); | |
| 207 } | |
| 208 | |
| 209 /* | |
| 210 ** Convert value rc into a string and print it using zFormat. zFormat | |
| 211 ** should have exactly one %s | |
| 212 */ | |
| 213 static void vfstrace_print_errcode( | |
| 214 vfstrace_info *pInfo, | |
| 215 const char *zFormat, | |
| 216 int rc | |
| 217 ){ | |
| 218 char zBuf[50]; | |
| 219 char *zVal; | |
| 220 switch( rc ){ | |
| 221 case SQLITE_OK: zVal = "SQLITE_OK"; break; | |
| 222 case SQLITE_ERROR: zVal = "SQLITE_ERROR"; break; | |
| 223 case SQLITE_PERM: zVal = "SQLITE_PERM"; break; | |
| 224 case SQLITE_ABORT: zVal = "SQLITE_ABORT"; break; | |
| 225 case SQLITE_BUSY: zVal = "SQLITE_BUSY"; break; | |
| 226 case SQLITE_NOMEM: zVal = "SQLITE_NOMEM"; break; | |
| 227 case SQLITE_READONLY: zVal = "SQLITE_READONLY"; break; | |
| 228 case SQLITE_INTERRUPT: zVal = "SQLITE_INTERRUPT"; break; | |
| 229 case SQLITE_IOERR: zVal = "SQLITE_IOERR"; break; | |
| 230 case SQLITE_CORRUPT: zVal = "SQLITE_CORRUPT"; break; | |
| 231 case SQLITE_FULL: zVal = "SQLITE_FULL"; break; | |
| 232 case SQLITE_CANTOPEN: zVal = "SQLITE_CANTOPEN"; break; | |
| 233 case SQLITE_PROTOCOL: zVal = "SQLITE_PROTOCOL"; break; | |
| 234 case SQLITE_EMPTY: zVal = "SQLITE_EMPTY"; break; | |
| 235 case SQLITE_SCHEMA: zVal = "SQLITE_SCHEMA"; break; | |
| 236 case SQLITE_CONSTRAINT: zVal = "SQLITE_CONSTRAINT"; break; | |
| 237 case SQLITE_MISMATCH: zVal = "SQLITE_MISMATCH"; break; | |
| 238 case SQLITE_MISUSE: zVal = "SQLITE_MISUSE"; break; | |
| 239 case SQLITE_NOLFS: zVal = "SQLITE_NOLFS"; break; | |
| 240 case SQLITE_IOERR_READ: zVal = "SQLITE_IOERR_READ"; break; | |
| 241 case SQLITE_IOERR_SHORT_READ: zVal = "SQLITE_IOERR_SHORT_READ"; break; | |
| 242 case SQLITE_IOERR_WRITE: zVal = "SQLITE_IOERR_WRITE"; break; | |
| 243 case SQLITE_IOERR_FSYNC: zVal = "SQLITE_IOERR_FSYNC"; break; | |
| 244 case SQLITE_IOERR_DIR_FSYNC: zVal = "SQLITE_IOERR_DIR_FSYNC"; break; | |
| 245 case SQLITE_IOERR_TRUNCATE: zVal = "SQLITE_IOERR_TRUNCATE"; break; | |
| 246 case SQLITE_IOERR_FSTAT: zVal = "SQLITE_IOERR_FSTAT"; break; | |
| 247 case SQLITE_IOERR_UNLOCK: zVal = "SQLITE_IOERR_UNLOCK"; break; | |
| 248 case SQLITE_IOERR_RDLOCK: zVal = "SQLITE_IOERR_RDLOCK"; break; | |
| 249 case SQLITE_IOERR_DELETE: zVal = "SQLITE_IOERR_DELETE"; break; | |
| 250 case SQLITE_IOERR_BLOCKED: zVal = "SQLITE_IOERR_BLOCKED"; break; | |
| 251 case SQLITE_IOERR_NOMEM: zVal = "SQLITE_IOERR_NOMEM"; break; | |
| 252 case SQLITE_IOERR_ACCESS: zVal = "SQLITE_IOERR_ACCESS"; break; | |
| 253 case SQLITE_IOERR_CHECKRESERVEDLOCK: | |
| 254 zVal = "SQLITE_IOERR_CHECKRESERVEDLOCK"; break; | |
| 255 case SQLITE_IOERR_LOCK: zVal = "SQLITE_IOERR_LOCK"; break; | |
| 256 case SQLITE_IOERR_CLOSE: zVal = "SQLITE_IOERR_CLOSE"; break; | |
| 257 case SQLITE_IOERR_DIR_CLOSE: zVal = "SQLITE_IOERR_DIR_CLOSE"; break; | |
| 258 case SQLITE_IOERR_SHMOPEN: zVal = "SQLITE_IOERR_SHMOPEN"; break; | |
| 259 case SQLITE_IOERR_SHMSIZE: zVal = "SQLITE_IOERR_SHMSIZE"; break; | |
| 260 case SQLITE_IOERR_SHMLOCK: zVal = "SQLITE_IOERR_SHMLOCK"; break; | |
| 261 case SQLITE_IOERR_SHMMAP: zVal = "SQLITE_IOERR_SHMMAP"; break; | |
| 262 case SQLITE_IOERR_SEEK: zVal = "SQLITE_IOERR_SEEK"; break; | |
| 263 case SQLITE_IOERR_GETTEMPPATH: zVal = "SQLITE_IOERR_GETTEMPPATH"; break; | |
| 264 case SQLITE_IOERR_CONVPATH: zVal = "SQLITE_IOERR_CONVPATH"; break; | |
| 265 case SQLITE_READONLY_DBMOVED: zVal = "SQLITE_READONLY_DBMOVED"; break; | |
| 266 case SQLITE_LOCKED_SHAREDCACHE: zVal = "SQLITE_LOCKED_SHAREDCACHE"; break; | |
| 267 case SQLITE_BUSY_RECOVERY: zVal = "SQLITE_BUSY_RECOVERY"; break; | |
| 268 case SQLITE_CANTOPEN_NOTEMPDIR: zVal = "SQLITE_CANTOPEN_NOTEMPDIR"; break; | |
| 269 default: { | |
| 270 sqlite3_snprintf(sizeof(zBuf), zBuf, "%d", rc); | |
| 271 zVal = zBuf; | |
| 272 break; | |
| 273 } | |
| 274 } | |
| 275 vfstrace_printf(pInfo, zFormat, zVal); | |
| 276 } | |
| 277 | |
| 278 /* | |
| 279 ** Append to a buffer. | |
| 280 */ | |
| 281 static void strappend(char *z, int *pI, const char *zAppend){ | |
| 282 int i = *pI; | |
| 283 while( zAppend[0] ){ z[i++] = *(zAppend++); } | |
| 284 z[i] = 0; | |
| 285 *pI = i; | |
| 286 } | |
| 287 | |
| 288 /* | |
| 289 ** Close an vfstrace-file. | |
| 290 */ | |
| 291 static int vfstraceClose(sqlite3_file *pFile){ | |
| 292 vfstrace_file *p = (vfstrace_file *)pFile; | |
| 293 vfstrace_info *pInfo = p->pInfo; | |
| 294 int rc; | |
| 295 vfstrace_printf(pInfo, "%s.xClose(%s)", pInfo->zVfsName, p->zFName); | |
| 296 rc = p->pReal->pMethods->xClose(p->pReal); | |
| 297 vfstrace_print_errcode(pInfo, " -> %s\n", rc); | |
| 298 if( rc==SQLITE_OK ){ | |
| 299 sqlite3_free((void*)p->base.pMethods); | |
| 300 p->base.pMethods = 0; | |
| 301 } | |
| 302 return rc; | |
| 303 } | |
| 304 | |
| 305 /* | |
| 306 ** Read data from an vfstrace-file. | |
| 307 */ | |
| 308 static int vfstraceRead( | |
| 309 sqlite3_file *pFile, | |
| 310 void *zBuf, | |
| 311 int iAmt, | |
| 312 sqlite_int64 iOfst | |
| 313 ){ | |
| 314 vfstrace_file *p = (vfstrace_file *)pFile; | |
| 315 vfstrace_info *pInfo = p->pInfo; | |
| 316 int rc; | |
| 317 vfstrace_printf(pInfo, "%s.xRead(%s,n=%d,ofst=%lld)", | |
| 318 pInfo->zVfsName, p->zFName, iAmt, iOfst); | |
| 319 rc = p->pReal->pMethods->xRead(p->pReal, zBuf, iAmt, iOfst); | |
| 320 vfstrace_print_errcode(pInfo, " -> %s\n", rc); | |
| 321 return rc; | |
| 322 } | |
| 323 | |
| 324 /* | |
| 325 ** Write data to an vfstrace-file. | |
| 326 */ | |
| 327 static int vfstraceWrite( | |
| 328 sqlite3_file *pFile, | |
| 329 const void *zBuf, | |
| 330 int iAmt, | |
| 331 sqlite_int64 iOfst | |
| 332 ){ | |
| 333 vfstrace_file *p = (vfstrace_file *)pFile; | |
| 334 vfstrace_info *pInfo = p->pInfo; | |
| 335 int rc; | |
| 336 vfstrace_printf(pInfo, "%s.xWrite(%s,n=%d,ofst=%lld)", | |
| 337 pInfo->zVfsName, p->zFName, iAmt, iOfst); | |
| 338 rc = p->pReal->pMethods->xWrite(p->pReal, zBuf, iAmt, iOfst); | |
| 339 vfstrace_print_errcode(pInfo, " -> %s\n", rc); | |
| 340 return rc; | |
| 341 } | |
| 342 | |
| 343 /* | |
| 344 ** Truncate an vfstrace-file. | |
| 345 */ | |
| 346 static int vfstraceTruncate(sqlite3_file *pFile, sqlite_int64 size){ | |
| 347 vfstrace_file *p = (vfstrace_file *)pFile; | |
| 348 vfstrace_info *pInfo = p->pInfo; | |
| 349 int rc; | |
| 350 vfstrace_printf(pInfo, "%s.xTruncate(%s,%lld)", pInfo->zVfsName, p->zFName, | |
| 351 size); | |
| 352 rc = p->pReal->pMethods->xTruncate(p->pReal, size); | |
| 353 vfstrace_printf(pInfo, " -> %d\n", rc); | |
| 354 return rc; | |
| 355 } | |
| 356 | |
| 357 /* | |
| 358 ** Sync an vfstrace-file. | |
| 359 */ | |
| 360 static int vfstraceSync(sqlite3_file *pFile, int flags){ | |
| 361 vfstrace_file *p = (vfstrace_file *)pFile; | |
| 362 vfstrace_info *pInfo = p->pInfo; | |
| 363 int rc; | |
| 364 int i; | |
| 365 char zBuf[100]; | |
| 366 memcpy(zBuf, "|0", 3); | |
| 367 i = 0; | |
| 368 if( flags & SQLITE_SYNC_FULL ) strappend(zBuf, &i, "|FULL"); | |
| 369 else if( flags & SQLITE_SYNC_NORMAL ) strappend(zBuf, &i, "|NORMAL"); | |
| 370 if( flags & SQLITE_SYNC_DATAONLY ) strappend(zBuf, &i, "|DATAONLY"); | |
| 371 if( flags & ~(SQLITE_SYNC_FULL|SQLITE_SYNC_DATAONLY) ){ | |
| 372 sqlite3_snprintf(sizeof(zBuf)-i, &zBuf[i], "|0x%x", flags); | |
| 373 } | |
| 374 vfstrace_printf(pInfo, "%s.xSync(%s,%s)", pInfo->zVfsName, p->zFName, | |
| 375 &zBuf[1]); | |
| 376 rc = p->pReal->pMethods->xSync(p->pReal, flags); | |
| 377 vfstrace_printf(pInfo, " -> %d\n", rc); | |
| 378 return rc; | |
| 379 } | |
| 380 | |
| 381 /* | |
| 382 ** Return the current file-size of an vfstrace-file. | |
| 383 */ | |
| 384 static int vfstraceFileSize(sqlite3_file *pFile, sqlite_int64 *pSize){ | |
| 385 vfstrace_file *p = (vfstrace_file *)pFile; | |
| 386 vfstrace_info *pInfo = p->pInfo; | |
| 387 int rc; | |
| 388 vfstrace_printf(pInfo, "%s.xFileSize(%s)", pInfo->zVfsName, p->zFName); | |
| 389 rc = p->pReal->pMethods->xFileSize(p->pReal, pSize); | |
| 390 vfstrace_print_errcode(pInfo, " -> %s,", rc); | |
| 391 vfstrace_printf(pInfo, " size=%lld\n", *pSize); | |
| 392 return rc; | |
| 393 } | |
| 394 | |
| 395 /* | |
| 396 ** Return the name of a lock. | |
| 397 */ | |
| 398 static const char *lockName(int eLock){ | |
| 399 const char *azLockNames[] = { | |
| 400 "NONE", "SHARED", "RESERVED", "PENDING", "EXCLUSIVE" | |
| 401 }; | |
| 402 if( eLock<0 || eLock>=sizeof(azLockNames)/sizeof(azLockNames[0]) ){ | |
| 403 return "???"; | |
| 404 }else{ | |
| 405 return azLockNames[eLock]; | |
| 406 } | |
| 407 } | |
| 408 | |
| 409 /* | |
| 410 ** Lock an vfstrace-file. | |
| 411 */ | |
| 412 static int vfstraceLock(sqlite3_file *pFile, int eLock){ | |
| 413 vfstrace_file *p = (vfstrace_file *)pFile; | |
| 414 vfstrace_info *pInfo = p->pInfo; | |
| 415 int rc; | |
| 416 vfstrace_printf(pInfo, "%s.xLock(%s,%s)", pInfo->zVfsName, p->zFName, | |
| 417 lockName(eLock)); | |
| 418 rc = p->pReal->pMethods->xLock(p->pReal, eLock); | |
| 419 vfstrace_print_errcode(pInfo, " -> %s\n", rc); | |
| 420 return rc; | |
| 421 } | |
| 422 | |
| 423 /* | |
| 424 ** Unlock an vfstrace-file. | |
| 425 */ | |
| 426 static int vfstraceUnlock(sqlite3_file *pFile, int eLock){ | |
| 427 vfstrace_file *p = (vfstrace_file *)pFile; | |
| 428 vfstrace_info *pInfo = p->pInfo; | |
| 429 int rc; | |
| 430 vfstrace_printf(pInfo, "%s.xUnlock(%s,%s)", pInfo->zVfsName, p->zFName, | |
| 431 lockName(eLock)); | |
| 432 rc = p->pReal->pMethods->xUnlock(p->pReal, eLock); | |
| 433 vfstrace_print_errcode(pInfo, " -> %s\n", rc); | |
| 434 return rc; | |
| 435 } | |
| 436 | |
| 437 /* | |
| 438 ** Check if another file-handle holds a RESERVED lock on an vfstrace-file. | |
| 439 */ | |
| 440 static int vfstraceCheckReservedLock(sqlite3_file *pFile, int *pResOut){ | |
| 441 vfstrace_file *p = (vfstrace_file *)pFile; | |
| 442 vfstrace_info *pInfo = p->pInfo; | |
| 443 int rc; | |
| 444 vfstrace_printf(pInfo, "%s.xCheckReservedLock(%s,%d)", | |
| 445 pInfo->zVfsName, p->zFName); | |
| 446 rc = p->pReal->pMethods->xCheckReservedLock(p->pReal, pResOut); | |
| 447 vfstrace_print_errcode(pInfo, " -> %s", rc); | |
| 448 vfstrace_printf(pInfo, ", out=%d\n", *pResOut); | |
| 449 return rc; | |
| 450 } | |
| 451 | |
| 452 /* | |
| 453 ** File control method. For custom operations on an vfstrace-file. | |
| 454 */ | |
| 455 static int vfstraceFileControl(sqlite3_file *pFile, int op, void *pArg){ | |
| 456 vfstrace_file *p = (vfstrace_file *)pFile; | |
| 457 vfstrace_info *pInfo = p->pInfo; | |
| 458 int rc; | |
| 459 char zBuf[100]; | |
| 460 char *zOp; | |
| 461 switch( op ){ | |
| 462 case SQLITE_FCNTL_LOCKSTATE: zOp = "LOCKSTATE"; break; | |
| 463 case SQLITE_GET_LOCKPROXYFILE: zOp = "GET_LOCKPROXYFILE"; break; | |
| 464 case SQLITE_SET_LOCKPROXYFILE: zOp = "SET_LOCKPROXYFILE"; break; | |
| 465 case SQLITE_LAST_ERRNO: zOp = "LAST_ERRNO"; break; | |
| 466 case SQLITE_FCNTL_SIZE_HINT: { | |
| 467 sqlite3_snprintf(sizeof(zBuf), zBuf, "SIZE_HINT,%lld", | |
| 468 *(sqlite3_int64*)pArg); | |
| 469 zOp = zBuf; | |
| 470 break; | |
| 471 } | |
| 472 case SQLITE_FCNTL_CHUNK_SIZE: { | |
| 473 sqlite3_snprintf(sizeof(zBuf), zBuf, "CHUNK_SIZE,%d", *(int*)pArg); | |
| 474 zOp = zBuf; | |
| 475 break; | |
| 476 } | |
| 477 case SQLITE_FCNTL_FILE_POINTER: zOp = "FILE_POINTER"; break; | |
| 478 case SQLITE_FCNTL_SYNC_OMITTED: zOp = "SYNC_OMITTED"; break; | |
| 479 case SQLITE_FCNTL_WIN32_AV_RETRY: zOp = "WIN32_AV_RETRY"; break; | |
| 480 case SQLITE_FCNTL_PERSIST_WAL: zOp = "PERSIST_WAL"; break; | |
| 481 case SQLITE_FCNTL_OVERWRITE: zOp = "OVERWRITE"; break; | |
| 482 case SQLITE_FCNTL_VFSNAME: zOp = "VFSNAME"; break; | |
| 483 case SQLITE_FCNTL_TEMPFILENAME: zOp = "TEMPFILENAME"; break; | |
| 484 case 0xca093fa0: zOp = "DB_UNCHANGED"; break; | |
| 485 case SQLITE_FCNTL_PRAGMA: { | |
| 486 const char *const* a = (const char*const*)pArg; | |
| 487 sqlite3_snprintf(sizeof(zBuf), zBuf, "PRAGMA,[%s,%s]",a[1],a[2]); | |
| 488 zOp = zBuf; | |
| 489 break; | |
| 490 } | |
| 491 default: { | |
| 492 sqlite3_snprintf(sizeof zBuf, zBuf, "%d", op); | |
| 493 zOp = zBuf; | |
| 494 break; | |
| 495 } | |
| 496 } | |
| 497 vfstrace_printf(pInfo, "%s.xFileControl(%s,%s)", | |
| 498 pInfo->zVfsName, p->zFName, zOp); | |
| 499 rc = p->pReal->pMethods->xFileControl(p->pReal, op, pArg); | |
| 500 vfstrace_print_errcode(pInfo, " -> %s\n", rc); | |
| 501 if( op==SQLITE_FCNTL_VFSNAME && rc==SQLITE_OK ){ | |
| 502 *(char**)pArg = sqlite3_mprintf("vfstrace.%s/%z", | |
| 503 pInfo->zVfsName, *(char**)pArg); | |
| 504 } | |
| 505 if( (op==SQLITE_FCNTL_PRAGMA || op==SQLITE_FCNTL_TEMPFILENAME) | |
| 506 && rc==SQLITE_OK && *(char**)pArg ){ | |
| 507 vfstrace_printf(pInfo, "%s.xFileControl(%s,%s) returns %s", | |
| 508 pInfo->zVfsName, p->zFName, zOp, *(char**)pArg); | |
| 509 } | |
| 510 return rc; | |
| 511 } | |
| 512 | |
| 513 /* | |
| 514 ** Return the sector-size in bytes for an vfstrace-file. | |
| 515 */ | |
| 516 static int vfstraceSectorSize(sqlite3_file *pFile){ | |
| 517 vfstrace_file *p = (vfstrace_file *)pFile; | |
| 518 vfstrace_info *pInfo = p->pInfo; | |
| 519 int rc; | |
| 520 vfstrace_printf(pInfo, "%s.xSectorSize(%s)", pInfo->zVfsName, p->zFName); | |
| 521 rc = p->pReal->pMethods->xSectorSize(p->pReal); | |
| 522 vfstrace_printf(pInfo, " -> %d\n", rc); | |
| 523 return rc; | |
| 524 } | |
| 525 | |
| 526 /* | |
| 527 ** Return the device characteristic flags supported by an vfstrace-file. | |
| 528 */ | |
| 529 static int vfstraceDeviceCharacteristics(sqlite3_file *pFile){ | |
| 530 vfstrace_file *p = (vfstrace_file *)pFile; | |
| 531 vfstrace_info *pInfo = p->pInfo; | |
| 532 int rc; | |
| 533 vfstrace_printf(pInfo, "%s.xDeviceCharacteristics(%s)", | |
| 534 pInfo->zVfsName, p->zFName); | |
| 535 rc = p->pReal->pMethods->xDeviceCharacteristics(p->pReal); | |
| 536 vfstrace_printf(pInfo, " -> 0x%08x\n", rc); | |
| 537 return rc; | |
| 538 } | |
| 539 | |
| 540 /* | |
| 541 ** Shared-memory operations. | |
| 542 */ | |
| 543 static int vfstraceShmLock(sqlite3_file *pFile, int ofst, int n, int flags){ | |
| 544 vfstrace_file *p = (vfstrace_file *)pFile; | |
| 545 vfstrace_info *pInfo = p->pInfo; | |
| 546 int rc; | |
| 547 char zLck[100]; | |
| 548 int i = 0; | |
| 549 memcpy(zLck, "|0", 3); | |
| 550 if( flags & SQLITE_SHM_UNLOCK ) strappend(zLck, &i, "|UNLOCK"); | |
| 551 if( flags & SQLITE_SHM_LOCK ) strappend(zLck, &i, "|LOCK"); | |
| 552 if( flags & SQLITE_SHM_SHARED ) strappend(zLck, &i, "|SHARED"); | |
| 553 if( flags & SQLITE_SHM_EXCLUSIVE ) strappend(zLck, &i, "|EXCLUSIVE"); | |
| 554 if( flags & ~(0xf) ){ | |
| 555 sqlite3_snprintf(sizeof(zLck)-i, &zLck[i], "|0x%x", flags); | |
| 556 } | |
| 557 vfstrace_printf(pInfo, "%s.xShmLock(%s,ofst=%d,n=%d,%s)", | |
| 558 pInfo->zVfsName, p->zFName, ofst, n, &zLck[1]); | |
| 559 rc = p->pReal->pMethods->xShmLock(p->pReal, ofst, n, flags); | |
| 560 vfstrace_print_errcode(pInfo, " -> %s\n", rc); | |
| 561 return rc; | |
| 562 } | |
| 563 static int vfstraceShmMap( | |
| 564 sqlite3_file *pFile, | |
| 565 int iRegion, | |
| 566 int szRegion, | |
| 567 int isWrite, | |
| 568 void volatile **pp | |
| 569 ){ | |
| 570 vfstrace_file *p = (vfstrace_file *)pFile; | |
| 571 vfstrace_info *pInfo = p->pInfo; | |
| 572 int rc; | |
| 573 vfstrace_printf(pInfo, "%s.xShmMap(%s,iRegion=%d,szRegion=%d,isWrite=%d,*)", | |
| 574 pInfo->zVfsName, p->zFName, iRegion, szRegion, isWrite); | |
| 575 rc = p->pReal->pMethods->xShmMap(p->pReal, iRegion, szRegion, isWrite, pp); | |
| 576 vfstrace_print_errcode(pInfo, " -> %s\n", rc); | |
| 577 return rc; | |
| 578 } | |
| 579 static void vfstraceShmBarrier(sqlite3_file *pFile){ | |
| 580 vfstrace_file *p = (vfstrace_file *)pFile; | |
| 581 vfstrace_info *pInfo = p->pInfo; | |
| 582 vfstrace_printf(pInfo, "%s.xShmBarrier(%s)\n", pInfo->zVfsName, p->zFName); | |
| 583 p->pReal->pMethods->xShmBarrier(p->pReal); | |
| 584 } | |
| 585 static int vfstraceShmUnmap(sqlite3_file *pFile, int delFlag){ | |
| 586 vfstrace_file *p = (vfstrace_file *)pFile; | |
| 587 vfstrace_info *pInfo = p->pInfo; | |
| 588 int rc; | |
| 589 vfstrace_printf(pInfo, "%s.xShmUnmap(%s,delFlag=%d)", | |
| 590 pInfo->zVfsName, p->zFName, delFlag); | |
| 591 rc = p->pReal->pMethods->xShmUnmap(p->pReal, delFlag); | |
| 592 vfstrace_print_errcode(pInfo, " -> %s\n", rc); | |
| 593 return rc; | |
| 594 } | |
| 595 | |
| 596 | |
| 597 | |
| 598 /* | |
| 599 ** Open an vfstrace file handle. | |
| 600 */ | |
| 601 static int vfstraceOpen( | |
| 602 sqlite3_vfs *pVfs, | |
| 603 const char *zName, | |
| 604 sqlite3_file *pFile, | |
| 605 int flags, | |
| 606 int *pOutFlags | |
| 607 ){ | |
| 608 int rc; | |
| 609 vfstrace_file *p = (vfstrace_file *)pFile; | |
| 610 vfstrace_info *pInfo = (vfstrace_info*)pVfs->pAppData; | |
| 611 sqlite3_vfs *pRoot = pInfo->pRootVfs; | |
| 612 p->pInfo = pInfo; | |
| 613 p->zFName = zName ? fileTail(zName) : "<temp>"; | |
| 614 p->pReal = (sqlite3_file *)&p[1]; | |
| 615 rc = pRoot->xOpen(pRoot, zName, p->pReal, flags, pOutFlags); | |
| 616 vfstrace_printf(pInfo, "%s.xOpen(%s,flags=0x%x)", | |
| 617 pInfo->zVfsName, p->zFName, flags); | |
| 618 if( p->pReal->pMethods ){ | |
| 619 sqlite3_io_methods *pNew = sqlite3_malloc( sizeof(*pNew) ); | |
| 620 const sqlite3_io_methods *pSub = p->pReal->pMethods; | |
| 621 memset(pNew, 0, sizeof(*pNew)); | |
| 622 pNew->iVersion = pSub->iVersion; | |
| 623 pNew->xClose = vfstraceClose; | |
| 624 pNew->xRead = vfstraceRead; | |
| 625 pNew->xWrite = vfstraceWrite; | |
| 626 pNew->xTruncate = vfstraceTruncate; | |
| 627 pNew->xSync = vfstraceSync; | |
| 628 pNew->xFileSize = vfstraceFileSize; | |
| 629 pNew->xLock = vfstraceLock; | |
| 630 pNew->xUnlock = vfstraceUnlock; | |
| 631 pNew->xCheckReservedLock = vfstraceCheckReservedLock; | |
| 632 pNew->xFileControl = vfstraceFileControl; | |
| 633 pNew->xSectorSize = vfstraceSectorSize; | |
| 634 pNew->xDeviceCharacteristics = vfstraceDeviceCharacteristics; | |
| 635 if( pNew->iVersion>=2 ){ | |
| 636 pNew->xShmMap = pSub->xShmMap ? vfstraceShmMap : 0; | |
| 637 pNew->xShmLock = pSub->xShmLock ? vfstraceShmLock : 0; | |
| 638 pNew->xShmBarrier = pSub->xShmBarrier ? vfstraceShmBarrier : 0; | |
| 639 pNew->xShmUnmap = pSub->xShmUnmap ? vfstraceShmUnmap : 0; | |
| 640 } | |
| 641 pFile->pMethods = pNew; | |
| 642 } | |
| 643 vfstrace_print_errcode(pInfo, " -> %s", rc); | |
| 644 if( pOutFlags ){ | |
| 645 vfstrace_printf(pInfo, ", outFlags=0x%x\n", *pOutFlags); | |
| 646 }else{ | |
| 647 vfstrace_printf(pInfo, "\n"); | |
| 648 } | |
| 649 return rc; | |
| 650 } | |
| 651 | |
| 652 /* | |
| 653 ** Delete the file located at zPath. If the dirSync argument is true, | |
| 654 ** ensure the file-system modifications are synced to disk before | |
| 655 ** returning. | |
| 656 */ | |
| 657 static int vfstraceDelete(sqlite3_vfs *pVfs, const char *zPath, int dirSync){ | |
| 658 vfstrace_info *pInfo = (vfstrace_info*)pVfs->pAppData; | |
| 659 sqlite3_vfs *pRoot = pInfo->pRootVfs; | |
| 660 int rc; | |
| 661 vfstrace_printf(pInfo, "%s.xDelete(\"%s\",%d)", | |
| 662 pInfo->zVfsName, zPath, dirSync); | |
| 663 rc = pRoot->xDelete(pRoot, zPath, dirSync); | |
| 664 vfstrace_print_errcode(pInfo, " -> %s\n", rc); | |
| 665 return rc; | |
| 666 } | |
| 667 | |
| 668 /* | |
| 669 ** Test for access permissions. Return true if the requested permission | |
| 670 ** is available, or false otherwise. | |
| 671 */ | |
| 672 static int vfstraceAccess( | |
| 673 sqlite3_vfs *pVfs, | |
| 674 const char *zPath, | |
| 675 int flags, | |
| 676 int *pResOut | |
| 677 ){ | |
| 678 vfstrace_info *pInfo = (vfstrace_info*)pVfs->pAppData; | |
| 679 sqlite3_vfs *pRoot = pInfo->pRootVfs; | |
| 680 int rc; | |
| 681 vfstrace_printf(pInfo, "%s.xAccess(\"%s\",%d)", | |
| 682 pInfo->zVfsName, zPath, flags); | |
| 683 rc = pRoot->xAccess(pRoot, zPath, flags, pResOut); | |
| 684 vfstrace_print_errcode(pInfo, " -> %s", rc); | |
| 685 vfstrace_printf(pInfo, ", out=%d\n", *pResOut); | |
| 686 return rc; | |
| 687 } | |
| 688 | |
| 689 /* | |
| 690 ** Populate buffer zOut with the full canonical pathname corresponding | |
| 691 ** to the pathname in zPath. zOut is guaranteed to point to a buffer | |
| 692 ** of at least (DEVSYM_MAX_PATHNAME+1) bytes. | |
| 693 */ | |
| 694 static int vfstraceFullPathname( | |
| 695 sqlite3_vfs *pVfs, | |
| 696 const char *zPath, | |
| 697 int nOut, | |
| 698 char *zOut | |
| 699 ){ | |
| 700 vfstrace_info *pInfo = (vfstrace_info*)pVfs->pAppData; | |
| 701 sqlite3_vfs *pRoot = pInfo->pRootVfs; | |
| 702 int rc; | |
| 703 vfstrace_printf(pInfo, "%s.xFullPathname(\"%s\")", | |
| 704 pInfo->zVfsName, zPath); | |
| 705 rc = pRoot->xFullPathname(pRoot, zPath, nOut, zOut); | |
| 706 vfstrace_print_errcode(pInfo, " -> %s", rc); | |
| 707 vfstrace_printf(pInfo, ", out=\"%.*s\"\n", nOut, zOut); | |
| 708 return rc; | |
| 709 } | |
| 710 | |
| 711 /* | |
| 712 ** Open the dynamic library located at zPath and return a handle. | |
| 713 */ | |
| 714 static void *vfstraceDlOpen(sqlite3_vfs *pVfs, const char *zPath){ | |
| 715 vfstrace_info *pInfo = (vfstrace_info*)pVfs->pAppData; | |
| 716 sqlite3_vfs *pRoot = pInfo->pRootVfs; | |
| 717 vfstrace_printf(pInfo, "%s.xDlOpen(\"%s\")\n", pInfo->zVfsName, zPath); | |
| 718 return pRoot->xDlOpen(pRoot, zPath); | |
| 719 } | |
| 720 | |
| 721 /* | |
| 722 ** Populate the buffer zErrMsg (size nByte bytes) with a human readable | |
| 723 ** utf-8 string describing the most recent error encountered associated | |
| 724 ** with dynamic libraries. | |
| 725 */ | |
| 726 static void vfstraceDlError(sqlite3_vfs *pVfs, int nByte, char *zErrMsg){ | |
| 727 vfstrace_info *pInfo = (vfstrace_info*)pVfs->pAppData; | |
| 728 sqlite3_vfs *pRoot = pInfo->pRootVfs; | |
| 729 vfstrace_printf(pInfo, "%s.xDlError(%d)", pInfo->zVfsName, nByte); | |
| 730 pRoot->xDlError(pRoot, nByte, zErrMsg); | |
| 731 vfstrace_printf(pInfo, " -> \"%s\"", zErrMsg); | |
| 732 } | |
| 733 | |
| 734 /* | |
| 735 ** Return a pointer to the symbol zSymbol in the dynamic library pHandle. | |
| 736 */ | |
| 737 static void (*vfstraceDlSym(sqlite3_vfs *pVfs,void *p,const char *zSym))(void){ | |
| 738 vfstrace_info *pInfo = (vfstrace_info*)pVfs->pAppData; | |
| 739 sqlite3_vfs *pRoot = pInfo->pRootVfs; | |
| 740 vfstrace_printf(pInfo, "%s.xDlSym(\"%s\")\n", pInfo->zVfsName, zSym); | |
| 741 return pRoot->xDlSym(pRoot, p, zSym); | |
| 742 } | |
| 743 | |
| 744 /* | |
| 745 ** Close the dynamic library handle pHandle. | |
| 746 */ | |
| 747 static void vfstraceDlClose(sqlite3_vfs *pVfs, void *pHandle){ | |
| 748 vfstrace_info *pInfo = (vfstrace_info*)pVfs->pAppData; | |
| 749 sqlite3_vfs *pRoot = pInfo->pRootVfs; | |
| 750 vfstrace_printf(pInfo, "%s.xDlOpen()\n", pInfo->zVfsName); | |
| 751 pRoot->xDlClose(pRoot, pHandle); | |
| 752 } | |
| 753 | |
| 754 /* | |
| 755 ** Populate the buffer pointed to by zBufOut with nByte bytes of | |
| 756 ** random data. | |
| 757 */ | |
| 758 static int vfstraceRandomness(sqlite3_vfs *pVfs, int nByte, char *zBufOut){ | |
| 759 vfstrace_info *pInfo = (vfstrace_info*)pVfs->pAppData; | |
| 760 sqlite3_vfs *pRoot = pInfo->pRootVfs; | |
| 761 vfstrace_printf(pInfo, "%s.xRandomness(%d)\n", pInfo->zVfsName, nByte); | |
| 762 return pRoot->xRandomness(pRoot, nByte, zBufOut); | |
| 763 } | |
| 764 | |
| 765 /* | |
| 766 ** Sleep for nMicro microseconds. Return the number of microseconds | |
| 767 ** actually slept. | |
| 768 */ | |
| 769 static int vfstraceSleep(sqlite3_vfs *pVfs, int nMicro){ | |
| 770 vfstrace_info *pInfo = (vfstrace_info*)pVfs->pAppData; | |
| 771 sqlite3_vfs *pRoot = pInfo->pRootVfs; | |
| 772 return pRoot->xSleep(pRoot, nMicro); | |
| 773 } | |
| 774 | |
| 775 /* | |
| 776 ** Return the current time as a Julian Day number in *pTimeOut. | |
| 777 */ | |
| 778 static int vfstraceCurrentTime(sqlite3_vfs *pVfs, double *pTimeOut){ | |
| 779 vfstrace_info *pInfo = (vfstrace_info*)pVfs->pAppData; | |
| 780 sqlite3_vfs *pRoot = pInfo->pRootVfs; | |
| 781 return pRoot->xCurrentTime(pRoot, pTimeOut); | |
| 782 } | |
| 783 static int vfstraceCurrentTimeInt64(sqlite3_vfs *pVfs, sqlite3_int64 *pTimeOut){ | |
| 784 vfstrace_info *pInfo = (vfstrace_info*)pVfs->pAppData; | |
| 785 sqlite3_vfs *pRoot = pInfo->pRootVfs; | |
| 786 return pRoot->xCurrentTimeInt64(pRoot, pTimeOut); | |
| 787 } | |
| 788 | |
| 789 /* | |
| 790 ** Return th3 emost recent error code and message | |
| 791 */ | |
| 792 static int vfstraceGetLastError(sqlite3_vfs *pVfs, int iErr, char *zErr){ | |
| 793 vfstrace_info *pInfo = (vfstrace_info*)pVfs->pAppData; | |
| 794 sqlite3_vfs *pRoot = pInfo->pRootVfs; | |
| 795 return pRoot->xGetLastError(pRoot, iErr, zErr); | |
| 796 } | |
| 797 | |
| 798 /* | |
| 799 ** Override system calls. | |
| 800 */ | |
| 801 static int vfstraceSetSystemCall( | |
| 802 sqlite3_vfs *pVfs, | |
| 803 const char *zName, | |
| 804 sqlite3_syscall_ptr pFunc | |
| 805 ){ | |
| 806 vfstrace_info *pInfo = (vfstrace_info*)pVfs->pAppData; | |
| 807 sqlite3_vfs *pRoot = pInfo->pRootVfs; | |
| 808 return pRoot->xSetSystemCall(pRoot, zName, pFunc); | |
| 809 } | |
| 810 static sqlite3_syscall_ptr vfstraceGetSystemCall( | |
| 811 sqlite3_vfs *pVfs, | |
| 812 const char *zName | |
| 813 ){ | |
| 814 vfstrace_info *pInfo = (vfstrace_info*)pVfs->pAppData; | |
| 815 sqlite3_vfs *pRoot = pInfo->pRootVfs; | |
| 816 return pRoot->xGetSystemCall(pRoot, zName); | |
| 817 } | |
| 818 static const char *vfstraceNextSystemCall(sqlite3_vfs *pVfs, const char *zName){ | |
| 819 vfstrace_info *pInfo = (vfstrace_info*)pVfs->pAppData; | |
| 820 sqlite3_vfs *pRoot = pInfo->pRootVfs; | |
| 821 return pRoot->xNextSystemCall(pRoot, zName); | |
| 822 } | |
| 823 | |
| 824 | |
| 825 /* | |
| 826 ** Clients invoke this routine to construct a new trace-vfs shim. | |
| 827 ** | |
| 828 ** Return SQLITE_OK on success. | |
| 829 ** | |
| 830 ** SQLITE_NOMEM is returned in the case of a memory allocation error. | |
| 831 ** SQLITE_NOTFOUND is returned if zOldVfsName does not exist. | |
| 832 */ | |
| 833 int vfstrace_register( | |
| 834 const char *zTraceName, /* Name of the newly constructed VFS */ | |
| 835 const char *zOldVfsName, /* Name of the underlying VFS */ | |
| 836 int (*xOut)(const char*,void*), /* Output routine. ex: fputs */ | |
| 837 void *pOutArg, /* 2nd argument to xOut. ex: stderr */ | |
| 838 int makeDefault /* True to make the new VFS the default */ | |
| 839 ){ | |
| 840 sqlite3_vfs *pNew; | |
| 841 sqlite3_vfs *pRoot; | |
| 842 vfstrace_info *pInfo; | |
| 843 int nName; | |
| 844 int nByte; | |
| 845 | |
| 846 pRoot = sqlite3_vfs_find(zOldVfsName); | |
| 847 if( pRoot==0 ) return SQLITE_NOTFOUND; | |
| 848 nName = strlen(zTraceName); | |
| 849 nByte = sizeof(*pNew) + sizeof(*pInfo) + nName + 1; | |
| 850 pNew = sqlite3_malloc( nByte ); | |
| 851 if( pNew==0 ) return SQLITE_NOMEM; | |
| 852 memset(pNew, 0, nByte); | |
| 853 pInfo = (vfstrace_info*)&pNew[1]; | |
| 854 pNew->iVersion = pRoot->iVersion; | |
| 855 pNew->szOsFile = pRoot->szOsFile + sizeof(vfstrace_file); | |
| 856 pNew->mxPathname = pRoot->mxPathname; | |
| 857 pNew->zName = (char*)&pInfo[1]; | |
| 858 memcpy((char*)&pInfo[1], zTraceName, nName+1); | |
| 859 pNew->pAppData = pInfo; | |
| 860 pNew->xOpen = vfstraceOpen; | |
| 861 pNew->xDelete = vfstraceDelete; | |
| 862 pNew->xAccess = vfstraceAccess; | |
| 863 pNew->xFullPathname = vfstraceFullPathname; | |
| 864 pNew->xDlOpen = pRoot->xDlOpen==0 ? 0 : vfstraceDlOpen; | |
| 865 pNew->xDlError = pRoot->xDlError==0 ? 0 : vfstraceDlError; | |
| 866 pNew->xDlSym = pRoot->xDlSym==0 ? 0 : vfstraceDlSym; | |
| 867 pNew->xDlClose = pRoot->xDlClose==0 ? 0 : vfstraceDlClose; | |
| 868 pNew->xRandomness = vfstraceRandomness; | |
| 869 pNew->xSleep = vfstraceSleep; | |
| 870 pNew->xCurrentTime = vfstraceCurrentTime; | |
| 871 pNew->xGetLastError = pRoot->xGetLastError==0 ? 0 : vfstraceGetLastError; | |
| 872 if( pNew->iVersion>=2 ){ | |
| 873 pNew->xCurrentTimeInt64 = pRoot->xCurrentTimeInt64==0 ? 0 : | |
| 874 vfstraceCurrentTimeInt64; | |
| 875 if( pNew->iVersion>=3 ){ | |
| 876 pNew->xSetSystemCall = pRoot->xSetSystemCall==0 ? 0 : | |
| 877 vfstraceSetSystemCall; | |
| 878 pNew->xGetSystemCall = pRoot->xGetSystemCall==0 ? 0 : | |
| 879 vfstraceGetSystemCall; | |
| 880 pNew->xNextSystemCall = pRoot->xNextSystemCall==0 ? 0 : | |
| 881 vfstraceNextSystemCall; | |
| 882 } | |
| 883 } | |
| 884 pInfo->pRootVfs = pRoot; | |
| 885 pInfo->xOut = xOut; | |
| 886 pInfo->pOutArg = pOutArg; | |
| 887 pInfo->zVfsName = pNew->zName; | |
| 888 pInfo->pTraceVfs = pNew; | |
| 889 vfstrace_printf(pInfo, "%s.enabled_for(\"%s\")\n", | |
| 890 pInfo->zVfsName, pRoot->zName); | |
| 891 return sqlite3_vfs_register(pNew, makeDefault); | |
| 892 } | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 2846743003:
[sql] Remove SQLite 3.10.2 reference directory. (Closed)
