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# OS_Errno.h File Reference

`#include "ace/pre.h"`
`#include "ace/OS_Export.h"`
`#include "ace/post.h"`

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## Compounds
class | ACE_Errno_Guard
| Provides a wrapper to improve performance when thread-specific errno must be saved and restored in a block of code. More...
## Defines
#define | ENOSYS EFAULT
#define | ENOTSUP ENOSYS
#define | ACE_ERRNO_TYPE int

## Detailed Description

OS_Errno.h,v 4.3 2002/04/10 17:44:16 ossama Exp

Author:
  (Originally in OS.h)Doug Schmidt <schmidt@cs.wustl.edu>

## Define Documentation

#define ACE_ERRNO_TYPE int

#define ENOSYS EFAULT

#define ENOTSUP ENOSYS