sysdeps/unix/sysv/linux/bits/errno.h

   1 /* Error constants.  Linux specific version.
   2    Copyright (C) 1996, 1997 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #ifdef _ERRNO_H
  21
  22 # undef EDOM
  23 # undef ERANGE
  24 # include <linux/errno.h>
  25
  26 # ifndef __ASSEMBLER__
  27 /* We now need a declaration of the `errno' variable.  */
  28 extern int errno;
  29
  30 /* Function to get address of global `errno' variable.  */
  31 extern int *__errno_location __P ((void)) __attribute__ ((__const__));
  32
  33 #  if defined _LIBC
  34 #   ifdef _LIBC_REENTRANT
  35 static inline int
  36 __set_errno (int __err)
  37 {
  38   return *__errno_location () = errno = __err;
  39 }
  40 #    define __set_errno __set_errno
  41 #   else /* !_LIBC_REENTRANT */
  42 #    define __set_errno(val) errno = (val)
  43 #   endif /* _LIBC_REENTRANT */
  44 #  endif /* _LIBC */
  45
  46 #  if !defined _LIBC || defined _LIBC_REENTRANT
  47 /* When using threads, errno is a per-thread value.  */
  48 #   define errno (*__errno_location ())
  49 #  endif
  50 # endif /* !__ASSEMBLER__ */
  51 #endif /* _ERRNO_H */
  52
  53 #if !defined _ERRNO_H && defined __need_Emath
  54 /* This is ugly but the kernel header is not clean enough.  We must
  55    define only the values EDOM and ERANGE in case __need_Emath is
  56    defined.  The value is the same for all Linux ports.  */
  57 # define EDOM   33      /* Math argument out of domain of function.  */
  58 # define EILSEQ 84      /* Illegal byte sequence.  */
  59 # define ERANGE 34      /* Math result not representable.  */
  60 #endif /* !_ERRNO_H && __need_Emath */