Enhance the sqlite3_load_extension() API so that the first parameter (the "db"

parameter) can be NULL.  An extension that is not associated with any 
database connection remains loaded for the life of the process.

FossilOrigin-Name: 3a461043898a77b14ffc12b5e332b3d65a8dca1d

manifest

@@ -1,5 +1,5 @@
-C Add\sthe\svfsstat.c\sloadable\sextension\s-\sa\sVFS\sshim\sthat\smeasures\sthe\samount\nof\sI/O,\sand\san\seponymous\svirtual\stable\sthat\sis\sused\sto\sextract\sand\sview\nthe\smeasurements.
-D 2016-05-28T14:53:48.676
+C Enhance\sthe\ssqlite3_load_extension()\sAPI\sso\sthat\sthe\sfirst\sparameter\s(the\s"db"\nparameter)\scan\sbe\sNULL.\s\sAn\sextension\sthat\sis\snot\sassociated\swith\sany\s\ndatabase\sconnection\sremains\sloaded\sfor\sthe\slife\sof\sthe\sprocess.
+D 2016-05-28T15:03:06.118
 F Makefile.in f59e0763ff448719fc1bd25513882b0567286317
 F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
 F Makefile.msc 306d73e854b1a92ea06e5d1e637faa5c44de53c7
@@ -344,7 +344,7 @@ F src/hash.h c8f3c31722cf3277d03713909761e152a5b81094
 F src/hwtime.h d32741c8f4df852c7d959236615444e2b1063b08
 F src/insert.c 8f4e9fcbd8e95e85f15647ba8b413b18d556ec2b
 F src/legacy.c 75d3023be8f0d2b99d60f905090341a03358c58e
-F src/loadext.c 8b3a73f0624c5f7cadbd5cb89940783bee1d39a6
+F src/loadext.c f2316d5ccd905d86260392fb8d2b5fd67335ed77
 F src/main.c 405d13e3a4f7c5add9fb27702ae70ed0a6e32cca
 F src/malloc.c 1443d1ad95d67c21d77af7ae3f44678252f0efec
 F src/mem0.c 6a55ebe57c46ca1a7d98da93aaa07f99f1059645
@@ -381,7 +381,7 @@ F src/random.c ba2679f80ec82c4190062d756f22d0c358180696
 F src/resolve.c cca3aa77b95706df5d635a2141a4d1de60ae6598
 F src/rowset.c 7b7e7e479212e65b723bf40128c7b36dc5afdfac
 F src/select.c a0c4abf54bc6bd3a9c77a36ef3d1676045706cb2
-F src/shell.c 14ff7f660530a52b117d110ba3390b7b2eb719b6
+F src/shell.c c80b8d562b66d27172b0e98333f2f27876d8b4aa
 F src/sqlite.h.in 9984129d86243424b765fcb3f147c697bd20bb54
 F src/sqlite3.rc 5121c9e10c3964d5755191c80dd1180c122fc3a8
 F src/sqlite3ext.h 98f72cbfe00169c39089115427d06ea05fe4b4a2
@@ -1496,7 +1496,10 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 71087c12bc75a82f5d1051600a442ef6efc5e899
-R 3d452eed48a36d85ceafabad1e13a1b0
+P 0987487dd4ebfcf66ddeec8ceca47775216a0887
+R e12f783957b755fbf23064ac37b7305b
+T *branch * persistent-extensions
+T *sym-persistent-extensions *
+T -sym-trunk *
 U drh
-Z 226f41fb99617919dc67fcf97f9a5431
+Z 7c91f0eea3a925fa49de1662b44330b3

manifest.uuid

@@ -1 +1 @@
-0987487dd4ebfcf66ddeec8ceca47775216a0887
+3a461043898a77b14ffc12b5e332b3d65a8dca1d

src/loadext.c

@@ -437,7 +437,7 @@ static int sqlite3LoadExtension(
   const char *zProc,    /* Entry point.  Use "sqlite3_extension_init" if 0 */
   char **pzErrMsg       /* Put error message here if not 0 */
 ){
-  sqlite3_vfs *pVfs = db->pVfs;
+  sqlite3_vfs *pVfs = db ? db->pVfs : sqlite3_vfs_find(0);
   void *handle;
   int (*xInit)(sqlite3*,char**,const sqlite3_api_routines*);
   char *zErrmsg = 0;
@@ -468,7 +468,7 @@ static int sqlite3LoadExtension(
   ** sqlite3_db_config(db, SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION, 1, 0)
   ** to turn on extension loading.
   */
-  if( (db->flags & SQLITE_LoadExtension)==0 ){
+  if( db && (db->flags & SQLITE_LoadExtension)==0 ){
     if( pzErrMsg ){
       *pzErrMsg = sqlite3_mprintf("not authorized");
     }
@@ -558,17 +558,18 @@ static int sqlite3LoadExtension(
   }
 
   /* Append the new shared library handle to the db->aExtension array. */
-  aHandle = sqlite3DbMallocZero(db, sizeof(handle)*(db->nExtension+1));
-  if( aHandle==0 ){
-    return SQLITE_NOMEM_BKPT;
+  if( db ){
+    aHandle = sqlite3DbMallocZero(db, sizeof(handle)*(db->nExtension+1));
+    if( aHandle==0 ){
+      return SQLITE_NOMEM_BKPT;
+    }
+    if( db->nExtension>0 ){
+      memcpy(aHandle, db->aExtension, sizeof(handle)*db->nExtension);
+    }
+    sqlite3DbFree(db, db->aExtension);
+    db->aExtension = aHandle;
+    db->aExtension[db->nExtension++] = handle;
   }
-  if( db->nExtension>0 ){
-    memcpy(aHandle, db->aExtension, sizeof(handle)*db->nExtension);
-  }
-  sqlite3DbFree(db, db->aExtension);
-  db->aExtension = aHandle;
-
-  db->aExtension[db->nExtension++] = handle;
   return SQLITE_OK;
 }
 int sqlite3_load_extension(
@@ -578,6 +579,7 @@ int sqlite3_load_extension(
   char **pzErrMsg       /* Put error message here if not 0 */
 ){
   int rc;
+  if( db==0 ) return sqlite3LoadExtension(0, zFile, zProc, pzErrMsg);
   sqlite3_mutex_enter(db->mutex);
   rc = sqlite3LoadExtension(db, zFile, zProc, pzErrMsg);
   rc = sqlite3ApiExit(db, rc);

src/shell.c

@@ -3755,7 +3755,7 @@ static int do_meta_command(char *zLine, ShellState *p){
     }
     zFile = azArg[1];
     zProc = nArg>=3 ? azArg[2] : 0;
-    open_db(p, 0);
+    /*    open_db(p, 0); */
     rc = sqlite3_load_extension(p->db, zFile, zProc, &zErrMsg);
     if( rc!=SQLITE_OK ){
       utf8_printf(stderr, "Error: %s\n", zErrMsg);