errno.h

   1 /* Copyright (C) 1991, 92, 93, 94, 95, 96 Free Software Foundation, Inc.
   2 This file is part of the GNU C Library.
   3
   4 The GNU C Library is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 License, or (at your option) any later version.
   8
   9 The GNU C Library is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 /*
  20  *      ANSI Standard: 4.1.3 Errors     <errno.h>
  21  */
  22
  23 #ifndef _ERRNO_H
  24
  25 /* The includer defined __need_Emath if he wants only the definitions
  26    of EDOM and ERANGE, and not everything else.  */
  27 #ifndef __need_Emath
  28 #define _ERRNO_H        1
  29 #include <features.h>
  30 #endif
  31
  32 __BEGIN_DECLS
  33
  34 /* Get the error number constants from the system-specific file.
  35    This file will test __need_Emath and _ERRNO_H.  */
  36 #include <errnos.h>
  37 #undef  __need_Emath
  38
  39 #ifdef  _ERRNO_H
  40 /* Declare the `errno' variable, unless it's defined as a macro by
  41    errnos.h.  This is the case in GNU, where it is a per-thread variable.
  42    This redeclaration using the macro still works, but it will be a
  43    function declaration without a prototype and may trigger a
  44    -Wstrict-prototypes warning.  */
  45 #ifndef errno
  46 extern int errno;
  47 #endif
  48
  49 #ifdef __USE_GNU
  50
  51 /* The Hurd <errnos.h> defines `error_t' as an enumerated type
  52    so that printing `error_t' values in the debugger shows the names.  */
  53 #ifndef __error_t_defined
  54 typedef int error_t;
  55 #define __error_t_defined       1
  56 #endif
  57
  58 /* The full and simple forms of the name with which the program was
  59    invoked.  These variables are set up automatically at startup based on
  60    the value of ARGV[0] (this works only if you use GNU ld).  */
  61 extern char *program_invocation_name, *program_invocation_short_name;
  62 #endif
  63
  64 __END_DECLS
  65 #endif
  66
  67 #endif /* errno.h       */