bk commit into 5.1 tree (rburnett:1.2183) BUG#17722

[reggie]

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ChangeSet
  1.2183 06/03/15 10:25:42 rburnett@stripped +1 -0
  Bug #17722 Test 'partition_02myisam' hangs on Windows
  
  The problem where is that Visual Studio 8 includes new security features to help write
more secure code.  One of these features is parameter validation.  Many of the CRT
functions, including lseek, assert on illegal parameter values in debug builds.  They
also call parameter validation callback routines that can be registered.  We solve this
problem by defaulting the error value to -1 and then only calling lseek if the fd != -1.
  
  my_seek.c:
    Only call lseek if the fd is not -1 on Windows

  mysys/my_seek.c
    1.12 06/03/15 10:22:30 rburnett@stripped +3 -2
    Only call lseek if the fd is not -1 on Windows

# This is a BitKeeper patch.  What follows are the unified diffs for the
# set of deltas contained in the patch.  The rest of the patch, the part
# that BitKeeper cares about, is below these diffs.
# User:	rburnett
# Host:	production.mysql.com
# Root:	/usersnfs/rburnett/mysql-5.1

--- 1.11/mysys/my_seek.c	2004-06-10 21:58:36 +02:00
+++ 1.12/mysys/my_seek.c	2006-03-15 10:22:30 +01:00
@@ -22,14 +22,15 @@
 my_off_t my_seek(File fd, my_off_t pos, int whence,
 		 myf MyFlags __attribute__((unused)))
 {
-  reg1 os_off_t newpos;
+  reg1 os_off_t newpos= -1;
   DBUG_ENTER("my_seek");
   DBUG_PRINT("my",("Fd: %d  Hpos: %lu  Pos: %lu  Whence: %d  MyFlags: %d",
 		   fd, (ulong) (((ulonglong) pos) >> 32), (ulong) pos, 
 		   whence, MyFlags));
   DBUG_ASSERT(pos != MY_FILEPOS_ERROR);		/* safety check */
 
-  newpos=lseek(fd, pos, whence);
+  if (-1 != fd)
+    newpos=lseek(fd, pos, whence);
   if (newpos == (os_off_t) -1)
   {
     my_errno=errno;