Disable the use of memory-mapped I/O if the SQLITE_DISABLE_MMAP macro is

defined.  Automatically define this macro for OpenBSD and QNX.  Other
systems are likely to be added to the disabled list over time.

FossilOrigin-Name: 8a4314a398c6c6efb25e6993c826b7e60d9bb1f9

manifest

@@ -1,5 +1,5 @@
-C In\smptester,\shandle\sstartScript\sno-change\scommits\susing\sa\sretry\srather\nthan\sgrabbing\san\sexclusive\stransaction.
-D 2013-04-08T19:13:48.566
+C Disable\sthe\suse\sof\smemory-mapped\sI/O\sif\sthe\sSQLITE_DISABLE_MMAP\smacro\sis\ndefined.\s\sAutomatically\sdefine\sthis\smacro\sfor\sOpenBSD\sand\sQNX.\s\sOther\nsystems\sare\slikely\sto\sbe\sadded\sto\sthe\sdisabled\slist\sover\stime.
+D 2013-04-08T20:47:49.018
 F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
 F Makefile.in 6a6a8c548822302d3a9a651f0296bbc3dad55e83
 F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
@@ -133,7 +133,7 @@ F src/btreeInt.h eecc84f02375b2bb7a44abbcbbe3747dde73edb2
 F src/build.c 083da8466fd7e481cb8bd5264398f537507f6176
 F src/callback.c d7e46f40c3cf53c43550b7da7a1d0479910b62cc
 F src/complete.c dc1d136c0feee03c2f7550bafc0d29075e36deac
-F src/ctime.c 16658a257bc6a3ca8d8961f574cf61a57e4d6faf
+F src/ctime.c 61a53c7e0db5e7ba60cf23b73deaf6779aa715d3
 F src/date.c 067a81c9942c497aafd2c260e13add8a7d0c7dd4
 F src/delete.c aeabdabeeeaa0584127f291baa9617153d334778
 F src/expr.c 48048fca951eedbc74aa32262154410d56c83812
@@ -163,18 +163,18 @@ F src/mutex_noop.c 7682796b7d8d39bf1c138248858efcd10c9e1553
 F src/mutex_unix.c c3a4e00f96ba068a8dbef34084465979aaf369cc
 F src/mutex_w32.c 32a9b3841e2d757355f0012b860b1bc5e01eafa0
 F src/notify.c 976dd0f6171d4588e89e874fcc765e92914b6d30
-F src/os.c 809d0707cec693e1b9b376ab229271ad74c3d35d
+F src/os.c ca679b293a6233327e418fd1dde2cd5db3e90932
 F src/os.h ae08bcc5f6ec6b339f4a2adf3931bb88cc14c3e4
 F src/os_common.h 92815ed65f805560b66166e3583470ff94478f04
 F src/os_unix.c 6d584190db2ed442e5c849b7f73dcfbbac7c032e
 F src/os_win.c 3265df8c762e0b8caf8d02b3352fa8c22e91ae6b
-F src/pager.c 2e68df46d4086027cb6b527d47a6dedbf1a6b7ec
+F src/pager.c eb6d272f4dc1ade4b8f664599cd54a9c95cb2729
 F src/pager.h 5cb78b8e1adfd5451e600be7719f5a99d87ac3b1
 F src/parse.y 5d5e12772845805fdfeb889163516b84fbb9ae95
 F src/pcache.c f8043b433a57aba85384a531e3937a804432a346
 F src/pcache.h a5e4f5d9f5d592051d91212c5949517971ae6222
 F src/pcache1.c 9fd22671c270b35131ef480bbc00392b8b5f8ab9
-F src/pragma.c 682e97f3e3b77fd6c9b569eabfbf4a14c987aca3
+F src/pragma.c 8bbc8c8697d13f76394e592dcecafce3491ed8ba
 F src/prepare.c 743e484233c51109666d402f470523553b41797c
 F src/printf.c 4a9f882f1c1787a8b494a2987765acf9d97ac21f
 F src/random.c cd4a67b3953b88019f8cd4ccd81394a8ddfaba50
@@ -185,8 +185,8 @@ F src/shell.c 319b7791cee6c763b60fde1b590bfaf62613cf37
 F src/sqlite.h.in 5fdc866a06ac82fd3c6ccb9f59a100151a36568c
 F src/sqlite3.rc fea433eb0a59f4c9393c8e6d76a6e2596b1fe0c0
 F src/sqlite3ext.h 7183ab832e23db0f934494f16928da127a571d75
-F src/sqliteInt.h 1664dc5ad6f8d4dab871416628aa3271044d66c0
-F src/sqliteLimit.h 1097d2c541147d303e66515040067c6bfcf8cf21
+F src/sqliteInt.h 1c517a89cfdba28084093607ec79af70359c7f9b
+F src/sqliteLimit.h 3ea5c07b370b8033c30f66515ccf4e875c252429
 F src/status.c bedc37ec1a6bb9399944024d63f4c769971955a9
 F src/table.c 2cd62736f845d82200acfa1287e33feb3c15d62e
 F src/tclsqlite.c 9a716c737590d2f129d71c8fc7065e5aba0e7222
@@ -203,7 +203,7 @@ F src/test_async.c 0612a752896fad42d55c3999a5122af10dcf22ad
 F src/test_autoext.c 30e7bd98ab6d70a62bb9ba572e4c7df347fe645e
 F src/test_backup.c c129c91127e9b46e335715ae2e75756e25ba27de
 F src/test_btree.c 5b89601dcb42a33ba8b820a6b763cc9cb48bac16
-F src/test_config.c ab6605a41f2020912d5e44b8dd4b9fb21bd75ac0
+F src/test_config.c b6f5d680f0cf03d0ae9d6165bd2e447d9b356e4a
 F src/test_demovfs.c 20a4975127993f4959890016ae9ce5535a880094
 F src/test_devsym.c e7498904e72ba7491d142d5c83b476c4e76993bc
 F src/test_fs.c 8f786bfd0ad48030cf2a06fb1f050e9c60a150d7
@@ -637,8 +637,8 @@ F test/misc5.test 528468b26d03303b1f047146e5eefc941b9069f5
 F test/misc6.test 953cc693924d88e6117aeba16f46f0bf5abede91
 F test/misc7.test dd82ec9250b89178b96cd28b2aca70639d21e5b3
 F test/misuse.test ba4fb5d1a6101d1c171ea38b3c613d0661c83054
-F test/mmap1.test 146a755bb382677b6f9993c61ddc7732b157d730
-F test/mmap2.test 62dbb5d718e66d654d232116c5a2d96e26a071a5
+F test/mmap1.test f064a9025136cd688c982ccdae81c7b4fac95724
+F test/mmap2.test a5ba639f90b5fc487400a49e158e14e465943e98
 F test/multiplex.test e08cc7177bd6d85990ee1d71100bb6c684c02256
 F test/multiplex2.test 580ca5817c7edbe4cc68fa150609c9473393003a
 F test/multiplex3.test d228f59eac91839a977eac19f21d053f03e4d101
@@ -663,7 +663,7 @@ F test/pager3.test 3856d9c80839be0668efee1b74811b1b7f7fc95f
 F test/pagerfault.test bba948be0564254b823ec6ca1fd95fbbfb0839a3
 F test/pagerfault2.test 1f79ea40d1133b2683a2f811b00f2399f7ec2401
 F test/pagerfault3.test f16e2efcb5fc9996d1356f7cbc44c998318ae1d7
-F test/pageropt.test 32cb5a6ed7ccddf8e8c842cb44240bd9340223ce
+F test/pageropt.test d6b695e6c12290c406150fc51eec32878d48df4c
 F test/pagesize.test 1dd51367e752e742f58e861e65ed7390603827a0
 F test/pcache.test 065aa286e722ab24f2e51792c1f093bf60656b16
 F test/pcache2.test a83efe2dec0d392f814bfc998def1d1833942025
@@ -961,11 +961,11 @@ F test/vtabF.test fd5ad376f5a34fe0891df1f3cddb4fe7c3eb077e
 F test/vtab_alter.test 9e374885248f69e251bdaacf480b04a197f125e5
 F test/vtab_err.test 0d4d8eb4def1d053ac7c5050df3024fd47a3fbd8
 F test/vtab_shared.test 82f463886e18d7f8395a4b6167c91815efe54839
-F test/wal.test bbd98ac09d8fbcaa80ec233757056eb1bbb7cd95
+F test/wal.test b934b757c4c3776b1e93140a9febc9ae068f9d90
 F test/wal2.test d4b470f13c87f6d8268b004380afa04c3c67cb90
 F test/wal3.test b22eb662bcbc148c5f6d956eaf94b047f7afe9c0
 F test/wal4.test 4744e155cd6299c6bd99d3eab1c82f77db9cdb3c
-F test/wal5.test f4d0aee6a2cf09e326ed2459011d396b4fdf661a
+F test/wal5.test 13c980d4d8d2d6b558361f19bed4ab31d41a2c7c
 F test/wal6.test 2e3bc767d9c2ce35c47106148d43fcbd072a93b3
 F test/wal7.test 2ae8f427d240099cc4b2dfef63cff44e2a68a1bd
 F test/wal8.test b3ee739fe8f7586aaebdc2367f477ebcf3e3b034
@@ -1050,7 +1050,7 @@ F tool/vdbe-compress.tcl f12c884766bd14277f4fcedcae07078011717381
 F tool/warnings-clang.sh f6aa929dc20ef1f856af04a730772f59283631d4
 F tool/warnings.sh fbc018d67fd7395f440c28f33ef0f94420226381
 F tool/win/sqlite.vsix 97894c2790eda7b5bce3cc79cb2a8ec2fde9b3ac
-P 437b674f00610e2b925dc00ca27b5022e3858994
-R 609e885f5484356f11d8798a6d9ad296
+P ae8bb24bfb014bdcb8aaa8159ddae0cd376afe99
+R 7e782b1e3841573f5a2d86903a4acfcf
 U drh
-Z f55865a5fe0b6f2c658b1f5dce1b30e8
+Z a7d6d975495e51a139482ed48c14db14

manifest.uuid

@@ -1 +1 @@
-ae8bb24bfb014bdcb8aaa8159ddae0cd376afe99
+8a4314a398c6c6efb25e6993c826b7e60d9bb1f9

src/ctime.c

@@ -66,6 +66,9 @@ static const char * const azCompileOpt[] = {
 #ifdef SQLITE_DISABLE_LFS
   "DISABLE_LFS",
 #endif
+#ifdef SQLITE_DISABLE_MMAP
+  "DISABLE_MMAP",
+#endif
 #ifdef SQLITE_ENABLE_ATOMIC_WRITE
   "ENABLE_ATOMIC_WRITE",
 #endif

src/os.c

@@ -141,6 +141,8 @@ int sqlite3OsShmMap(
   return id->pMethods->xShmMap(id, iPage, pgsz, bExtend, pp);
 }
 
+#if !defined(SQLITE_DISABLE_MMAP)
+/* The real implementation of xFetch and xUnfetch */
 int sqlite3OsFetch(sqlite3_file *id, i64 iOff, int iAmt, void **pp){
   DO_OS_MALLOC_TEST(id);
   return id->pMethods->xFetch(id, iOff, iAmt, pp);
@@ -148,6 +150,16 @@ int sqlite3OsFetch(sqlite3_file *id, i64 iOff, int iAmt, void **pp){
 int sqlite3OsUnfetch(sqlite3_file *id, i64 iOff, void *p){
   return id->pMethods->xUnfetch(id, iOff, p);
 }
+#else
+/* No-op stubs to use when memory-mapped I/O is disabled */
+int sqlite3OsFetch(sqlite3_file *id, i64 iOff, int iAmt, void **pp){
+  *pp = 0;
+  return SQLITE_OK;
+}
+int sqlite3OsUnfetch(sqlite3_file *id, i64 iOff, void *p){
+  return SQLITE_OK;
+}
+#endif
 
 /*
 ** The next group of routines are convenience wrappers around the

src/pager.c

@@ -770,6 +770,16 @@ static const unsigned char aJournalMagic[] = {
 # define MEMDB pPager->memDb
 #endif
 
+/*
+** The macro USEFETCH is true if we are allowed to use the xFetch and xUnfetch
+** interfaces to access the database using memory-mapped I/O.
+*/
+#ifdef SQLITE_DISABLE_MMAP
+# define USEFETCH(x) 0
+#else
+# define USEFETCH(x) ((x)->bUseFetch)
+#endif
+
 /*
 ** The maximum legal page number is (2^31 - 1).
 */
@@ -3090,7 +3100,7 @@ static int pagerBeginReadTransaction(Pager *pPager){
   rc = sqlite3WalBeginReadTransaction(pPager->pWal, &changed);
   if( rc!=SQLITE_OK || changed ){
     pager_reset(pPager);
-    if( pPager->bUseFetch ) sqlite3OsUnfetch(pPager->fd, 0, 0);
+    if( USEFETCH(pPager) ) sqlite3OsUnfetch(pPager->fd, 0, 0);
   }
 
   return rc;
@@ -3356,6 +3366,7 @@ void sqlite3PagerSetCachesize(Pager *pPager, int mxPage){
 ** Invoke SQLITE_FCNTL_MMAP_LIMIT based on the current value of mxMmap.
 */
 static void pagerFixMaplimit(Pager *pPager){
+#if !defined(SQLITE_DISABLE_MMAP)
   sqlite3_file *fd = pPager->fd;
   if( isOpen(fd) ){
     sqlite3_int64 mx;
@@ -3363,6 +3374,7 @@ static void pagerFixMaplimit(Pager *pPager){
     mx = pPager->mxMmap;
     sqlite3OsFileControlHint(pPager->fd, SQLITE_FCNTL_MMAP_LIMIT, &mx);
   }
+#endif
 }
 
 /*
@@ -5042,7 +5054,7 @@ int sqlite3PagerSharedLock(Pager *pPager){
     if( !pPager->tempFile && (
         pPager->pBackup 
      || sqlite3PcachePagecount(pPager->pPCache)>0 
-     || pPager->bUseFetch
+     || USEFETCH(pPager)
     )){
       /* The shared-lock has just been acquired on the database file
       ** and there are already pages in the cache (from a previous
@@ -5085,7 +5097,7 @@ int sqlite3PagerSharedLock(Pager *pPager){
         ** In this case there may exist a Pager.pMap mapping that appears
         ** to be the right size but is not actually valid. Avoid this
         ** possibility by unmapping the db here. */
-        if( pPager->bUseFetch ){
+        if( USEFETCH(pPager) ){
           sqlite3OsUnfetch(pPager->fd, 0, 0);
         }
       }
@@ -5199,7 +5211,7 @@ int sqlite3PagerAcquire(
   ** page 1 if there is no write-transaction open or the ACQUIRE_READONLY
   ** flag was specified by the caller. And so long as the db is not a 
   ** temporary or in-memory database.  */
-  const int bMmapOk = (pgno!=1 && pPager->bUseFetch
+  const int bMmapOk = (pgno!=1 && USEFETCH(pPager)
    && (pPager->eState==PAGER_READER || (flags & PAGER_ACQUIRE_READONLY))
   );
 

src/pragma.c

@@ -774,6 +774,9 @@ void sqlite3Pragma(
     }
     mx = -1;
     if( sqlite3_file_control(db,zDb,SQLITE_FCNTL_MMAP_LIMIT,&mx)==SQLITE_OK ){
+#if defined(SQLITE_DISABLE_MMAP)
+      mx = 0;
+#endif
       returnSingleInt(pParse, "mmap_limit", mx);
     }
   }else

src/sqliteInt.h

@@ -539,6 +539,14 @@ extern const int sqlite3one;
 # define EIGHT_BYTE_ALIGNMENT(X)   ((((char*)(X) - (char*)0)&7)==0)
 #endif
 
+/*
+** Disable MMAP on platforms where it is not supported
+*/
+#if defined(__OpenBSD__) || defined(__QNXNTO__)
+# undef SQLITE_DISABLE_MMAP
+# define SQLITE_DISABLE_MMAP 1
+#endif
+
 
 /*
 ** An instance of the following structure is used to store the busy-handler

src/sqliteLimit.h

@@ -210,6 +210,10 @@
 /*
 ** Default maximum size of memory used by xFetch in the VFS.
 */
+#ifdef SQLITE_DISABLE_MMAP
+# undef SQLITE_DEFAULT_MMAP_LIMIT
+# define SQLITE_DEFAULT_MMAP_LIMIT 0
+#endif
 #ifdef __APPLE__
 # include <TargetConditionals.h>
 # if TARGET_OS_IPHONE

src/test_config.c

@@ -87,6 +87,12 @@ static void set_options(Tcl_Interp *interp){
   Tcl_SetVar2(interp, "sqlite_options", "lfs", "1", TCL_GLOBAL_ONLY);
 #endif
 
+#ifdef SQLITE_DISABLE_MMAP
+  Tcl_SetVar2(interp, "sqlite_options", "mmap", "0", TCL_GLOBAL_ONLY);
+#else
+  Tcl_SetVar2(interp, "sqlite_options", "mmap", "1", TCL_GLOBAL_ONLY);
+#endif
+
 #if 1 /* def SQLITE_MEMDEBUG */
   Tcl_SetVar2(interp, "sqlite_options", "memdebug", "1", TCL_GLOBAL_ONLY);
 #else

test/mmap1.test

@@ -12,6 +12,10 @@
 
 set testdir [file dirname $argv0]
 source $testdir/tester.tcl
+ifcapable !mmap {
+  finish_test
+  return
+}
 source $testdir/lock_common.tcl
 set testprefix mmap1
 
@@ -311,5 +315,3 @@ foreach {tn1 mmap1 mmap2} {
 
 
 finish_test
-
-

test/mmap2.test

@@ -25,6 +25,10 @@ if {$::tcl_platform(platform)!="unix" || [test_syscall defaultvfs] != "unix"} {
   finish_test
   return
 }
+ifcapable !mmap {
+  finish_test
+  return
+}
 
 db close
 sqlite3_shutdown

test/pageropt.test

@@ -87,12 +87,17 @@ do_test pageropt-1.4 {
 # But if the other thread modifies the database, then the cache
 # must refill.
 #
+ifcapable mmap {
+  set x [expr {[permutation]=="nommap" ? 6 : 1}]
+} else {
+  set x 6
+}
 do_test pageropt-1.5 {
   db2 eval {CREATE TABLE t2(y)}
   pagercount_sql {
     SELECT hex(x) FROM t1
   }
-} [list [expr {[permutation]=="nommap" ? 6 : 1}] 0 0 $blobcontent]
+} [list $x 0 0 $blobcontent]
 do_test pageropt-1.6 {
   pagercount_sql {
     SELECT hex(x) FROM t1

test/wal.test

@@ -729,6 +729,7 @@ do_test wal-11.9 {
 sqlite3_wal db test.db
 set nWal 39
 if {[permutation]=="nommap"} {set nWal 37}
+ifcapable !mmap {set nWal 37}
 do_test wal-11.10 {
   execsql {
     PRAGMA cache_size = 10;

test/wal5.test

@@ -243,6 +243,7 @@ foreach {testprefix do_wal_checkpoint} {
     # start of the checkpoint, even though page 2 cannot be written.
     set nDb 2
     if {[permutation]=="no-mmap"} {set nDb 1}
+    ifcapable !mmap {set nDb 1}
     do_test 2.3.$tn.8 { file_page_counts } [list $nDb 4 2 4]
   }