Index: src/os_unix.c
==================================================================
--- src/os_unix.c
+++ src/os_unix.c
@@ -41,11 +41,11 @@
 **   *  sqlite3_vfs method implementations.
 **   *  Locking primitives for the proxy uber-locking-method. (MacOSX only)
 **   *  Definitions of sqlite3_vfs objects for all locking methods
 **      plus implementations of sqlite3_os_init() and sqlite3_os_end().
 **
-** $Id: os_unix.c,v 1.248 2009/03/30 07:39:35 danielk1977 Exp $
+** $Id: os_unix.c,v 1.249 2009/04/07 00:35:20 drh Exp $
 */
 #include "sqliteInt.h"
 #if SQLITE_OS_UNIX              /* This file is used on unix only */
 
 /*
@@ -3611,11 +3611,11 @@
   const char *zPath,           /* Pathname of file to be opened */
   sqlite3_file *pFile,         /* The file descriptor to be filled in */
   int flags,                   /* Input flags to control the opening */
   int *pOutFlags               /* Output flags returned to SQLite core */
 ){
-  int fd = 0;                    /* File descriptor returned by open() */
+  int fd = -1;                    /* File descriptor returned by open() */
   int dirfd = -1;                /* Directory file descriptor */
   int openFlags = 0;             /* Flags to pass to open() */
   int eType = flags&0xFFFFFF00;  /* Type of file to open */
   int noLock;                    /* True to omit locking primitives */
   int rc = SQLITE_OK;
@@ -3714,11 +3714,11 @@
   if( (flags & SQLITE_OPEN_MAIN_DB)!=0 ){
     ((unixFile*)pFile)->isLockable = 1;
   }
 #endif
 
-  assert(fd!=0);
+  assert( fd>=0 );
   if( isOpenDirectory ){
     rc = openDirectory(zPath, &dirfd);
     if( rc!=SQLITE_OK ){
       close(fd); /* silently leak if fail, already in error */
       return rc;