stdlib/errno.h

   1 /* Copyright (C) 1991-2017 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 Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the 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    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 /*
  19  *      ISO C99 Standard: 7.5 Errors    <errno.h>
  20  */
  21
  22 #ifndef _ERRNO_H
  23 #define _ERRNO_H 1
  24
  25 #include <features.h>
  26
  27 /* The system-specific definitions of the E* constants, as macros.  */
  28 #include <bits/errno.h>
  29
  30 /* When included from assembly language, this header only provides the
  31    E* constants.  */
  32 #ifndef __ASSEMBLER__
  33
  34 __BEGIN_DECLS
  35
  36 /* The error code set by various library functions.  */
  37 extern int *__errno_location (void) __THROW __attribute_const__;
  38 # define errno (*__errno_location ())
  39
  40 # ifdef __USE_GNU
  41
  42 /* The full and simple forms of the name with which the program was
  43    invoked.  These variables are set up automatically at startup based on
  44    the value of argv[0].  */
  45 extern char *program_invocation_name;
  46 extern char *program_invocation_short_name;
  47
  48 /* bits/errno.h may have defined this type.  If it didn't, provide a
  49    fallback definition.  */
  50 #  ifndef __error_t_defined
  51 #   define __error_t_defined 1
  52 typedef int error_t;
  53 #  endif
  54
  55 # endif /* __USE_GNU */
  56
  57 __END_DECLS
  58
  59 #endif /* !__ASSEMBLER__ */
  60 #endif /* errno.h */