1 files changed, 143 insertions, 0 deletions
diff --git a/ace/OS/OS_Errno.h b/ace/OS/OS_Errno.h
new file mode 100644
index 00000000000..4adfef97762
--- /dev/null
+++ b/ace/OS/OS_Errno.h
@@ -0,0 +1,143 @@
+// -*- C++ -*-
+
+//=============================================================================
+/**
+ *  @file   OS_Errno.h
+ *
+ *  $Id$
+ *
+ *  @author (Originally in OS.h)Doug Schmidt <schmidt@cs.wustl.edu>
+ */
+//=============================================================================
+
+#ifndef ACE_OS_ERRNO_H
+#define ACE_OS_ERRNO_H
+#include "ace/pre.h"
+
+#include "ace/config.h"
+#include "OS_Export.h"
+
+#if !defined (ACE_LACKS_PRAGMA_ONCE)
+# pragma once
+#endif /* ACE_LACKS_PRAGMA_ONCE */
+
+#if defined (ACE_HAS_H_ERRNO)
+void herror (const char *str);
+#endif /* ACE_HAS_H_ERRNO */
+
+#if !defined (ACE_HAS_WINCE)
+# include /**/ <errno.h>
+#endif /* ACE_HAS_WINCE */
+
+#if !defined (ACE_WIN32) && !defined (ACE_PSOS) && defined (ACE_LACKS_T_ERRNO)
+extern int t_errno;
+#endif /* ACE_WIN32 && !ACE_PSOS && ACE_LACKS_T_ERRNO */
+
+#if !defined (ENOSYS)
+# define ENOSYS EFAULT /* Operation not supported or unknown error. */
+#endif /* !ENOSYS */
+
+#if !defined (ENOTSUP)
+# define ENOTSUP ENOSYS  /* Operation not supported. */
+#endif /* !ENOTSUP */
+
+#if defined (ACE_HAS_WINCE_BROKEN_ERRNO)
+/**
+ * @class ACE_CE_Errno
+ *
+ * Some versions of CE don't support <errno> and some versions'
+ * implementations are busted.  So we implement our own.
+ * Our implementation takes up one Tls key, however, it does not
+ * allocate memory fromt the heap so there's no problem with cleanin
+ * up the errno when a thread exit.
+ */
+class ACE_OS_Export ACE_CE_Errno
+{
+public:
+  ACE_CE_Errno () {}
+  static void init ();
+  static void fini ();
+  static ACE_CE_Errno *instance ();
+
+  operator int (void) const;
+  int operator= (int);
+
+private:
+  static ACE_CE_Errno *instance_;
+  static DWORD errno_key_;
+};
+
+# define errno (* (ACE_CE_Errno::instance ()))
+#endif /* ACE_HAS_WINCE_BROKEN_ERRNO */
+
+#if defined (ACE_HAS_WINCE_BROKEN_ERRNO)
+#  define ACE_ERRNO_TYPE ACE_CE_Errno
+#else
+#  define ACE_ERRNO_TYPE int
+#endif /* ACE_HAS_WINCE */
+
+/**
+ * @class ACE_Errno_Guard
+ *
+ * @brief Provides a wrapper to improve performance when thread-specific
+ * errno must be saved and restored in a block of code.
+ *
+ * The typical use-case for this is the following:
+ * int error = errno;
+ * call_some_function_that_might_change_errno ();
+ * errno = error;
+ * This can be replaced with
+ * {
+ * ACE_Errno_Guard guard (errno);
+ * call_some_function_that_might_change_errno ();
+ * }
+ * This implementation is more elegant and more efficient since it
+ * avoids an unnecessary second access to thread-specific storage
+ * by caching a pointer to the value of errno in TSS.
+ */
+class ACE_OS_Export ACE_Errno_Guard
+{
+public:
+  ///  Stash the value of <error> into <error_> and initialize the
+  ///  <errno_ptr_> to the address of <errno_ref>.
+  ACE_Errno_Guard (ACE_ERRNO_TYPE &errno_ref,
+                   int error);
+
+  ///  Stash the value of <errno> into <error_> and initialize the
+  ///  <errno_ptr_> to the address of <errno_ref>.
+  ACE_Errno_Guard (ACE_ERRNO_TYPE &errno_ref);
+
+  /// Reset the value of <errno> to <error>.
+  ~ACE_Errno_Guard (void);
+
+#if defined (ACE_HAS_WINCE_BROKEN_ERRNO)
+  /// Assign <errno_ref> to <error_>.
+  int operator= (const ACE_ERRNO_TYPE &errno_ref);
+#endif /* ACE_HAS_WINCE_BROKEN_ERRNO */
+
+  /// Assign <error> to <error_>.
+  int operator= (int error);
+
+  /// Compare <error> with <error_> for equality.
+  int operator== (int error);
+
+  /// Compare <error> with <error_> for inequality.
+  int operator!= (int error);
+
+private:
+#if defined (ACE_MT_SAFE)
+  ACE_ERRNO_TYPE *errno_ptr_;
+#endif /* ACE_MT_SAFE */
+  int error_;
+};
+
+#if defined (ACE_HAS_INLINED_OSCALLS)
+# if defined (ACE_INLINE)
+#  undef ACE_INLINE
+# endif /* ACE_INLINE */
+# define ACE_INLINE inline
+# include "OS_Errno.inl"
+#endif /* ACE_HAS_INLINED_OSCALLS */
+
+#include "ace/post.h"
+#endif /* ACE_OS_ERRNO_H */