[sql] Import SQLite 3.17.0.

third_party/sqlite/src/src/test_devsym.c

 /*
 ** 2008 Jan 22
 **
 ** The author disclaims copyright to this source code.  In place of
 ** a legal notice, here is a blessing:
 **
 **    May you do good and not evil.
 **    May you find forgiveness for yourself and forgive others.
 **    May you share freely, never taking more than you give.
 **
@@ skipping 115 matching lines @@
   int iDeviceChar;
   int iSectorSize;
 };
 struct DevsymGlobal g = {0, 0, 512};
 
 /*
 ** Close an devsym-file.
 */
 static int devsymClose(sqlite3_file *pFile){
   devsym_file *p = (devsym_file *)pFile;
-  return sqlite3OsClose(p->pReal);
+  sqlite3OsClose(p->pReal);
+  return SQLITE_OK;
 }
 
 /*
 ** Read data from an devsym-file.
 */
 static int devsymRead(
   sqlite3_file *pFile, 
   void *zBuf, 
   int iAmt, 
   sqlite_int64 iOfst
@@ skipping 241 matching lines @@
   }else{
     g.iDeviceChar = 0;
   }
   if( iSectorSize>=0 ){
     g.iSectorSize = iSectorSize;
   }else{
     g.iSectorSize = 512;
   }
 }
 
+void devsym_unregister(){
+  sqlite3_vfs_unregister(&devsym_vfs);
+  g.pVfs = 0;
+  g.iDeviceChar = 0;
+  g.iSectorSize = 0;
+}
+
 #endif