gcc/ada/errno.c

   1 /****************************************************************************
   2  *                                                                          *
   3  *                 GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS                 *
   4  *                                                                          *
   5  *                                E R R N O                                 *
   6  *                                                                          *
   7  *                          C Implementation File                           *
   8  *                                                                          *
   9  *           Copyright (C) 1992-2012, Free Software Foundation, Inc.        *
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  11  * GNAT is free software;  you can  redistribute it  and/or modify it under *
  12  * terms of the  GNU General Public License as published  by the Free Soft- *
  13  * ware  Foundation;  either version 3,  or (at your option) any later ver- *
  14  * sion.  GNAT is distributed in the hope that it will be useful, but WITH- *
  15  * OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY *
  16  * or FITNESS FOR A PARTICULAR PURPOSE.                                     *
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  18  * As a special exception under Section 7 of GPL version 3, you are granted *
  19  * additional permissions described in the GCC Runtime Library Exception,   *
  20  * version 3.1, as published by the Free Software Foundation.               *
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  26  *                                                                          *
  27  * GNAT was originally developed  by the GNAT team at  New York University. *
  28  * Extensive contributions were provided by Ada Core Technologies Inc.      *
  29  *                                                                          *
  30  ****************************************************************************/
  31
  32 /* This file provides access to the C-language errno to the Ada interface
  33    for POSIX.  It is not possible in general to import errno, even in
  34    Ada compilers that allow (as GNAT does) the importation of variables,
  35    as it may be defined using a macro.
  36 */
  37
  38
  39 #define _REENTRANT
  40 #define _THREAD_SAFE
  41
  42 #ifdef MaRTE
  43
  44 /* MaRTE OS provides its own implementation of errno related functionality. We
  45    want to ensure the use of the MaRTE version for tasking programs (the MaRTE
  46    library will not be linked if no tasking constructs are used), so we use the
  47    weak symbols mechanism to use the MaRTE version whenever is available. */
  48
  49 #pragma weak __get_errno
  50 #pragma weak __set_errno
  51
  52 #endif
  53
  54 #include <errno.h>
  55 int
  56 __get_errno(void)
  57 {
  58   return errno;
  59 }
  60
  61 #ifndef __ANDROID__
  62 void
  63 __set_errno(int err)
  64 {
  65   errno = err;
  66 }
  67 #endif