1 files changed, 39 insertions, 0 deletions
diff --git a/src/os.c b/src/os.c
index 97036746a..a1acd7671 100644
--- a/src/os.c
+++ b/src/os.c
@@ -69,3 +69,42 @@ int sqlite3OsLockState(OsFile *id){
 int sqlite3OsCheckReservedLock(OsFile *id){
   return id->pMethod->xCheckReservedLock(id);
 }
+
+static void**getOsRoutinePtr(int eRoutine){
+  switch( eRoutine ){
+    case SQLITE_OS_ROUTINE_OPENREADWRITE:
+      return (void **)(&sqlite3Os.xOpenReadWrite);
+    case SQLITE_OS_ROUTINE_OPENREADONLY:
+      return (void **)(&sqlite3Os.xOpenReadOnly);
+    case SQLITE_OS_ROUTINE_OPENEXCLUSIVE:
+      return (void **)(&sqlite3Os.xOpenExclusive);
+    case SQLITE_OS_ROUTINE_DELETE:
+      return (void **)(&sqlite3Os.xDelete);
+    case SQLITE_OS_ROUTINE_FILEEXISTS:
+      return (void **)(&sqlite3Os.xFileExists);
+    case SQLITE_OS_ROUTINE_SYNCDIRECTORY:
+      return (void **)(&sqlite3Os.xSyncDirectory);
+    default:
+      assert(!"Illegal eRoutine value");
+  }
+  return 0;
+}
+
+void *sqlite3_os_routine_get(int eRoutine){
+  return *getOsRoutinePtr(eRoutine);
+}
+
+void *sqlite3_os_routine_set(int eRoutine, void *pRoutine){
+  void **ppRet = getOsRoutinePtr(eRoutine);
+  void *pRet = *ppRet;
+  *ppRet = pRoutine;
+  return pRet;
+}
+
+void sqlite3_os_enter_mutex(){
+  sqlite3Os.xEnterMutex();
+}
+void sqlite3_os_leave_mutex(){
+  sqlite3Os.xLeaveMutex();
+}
+