include/errno.h

   1 #ifndef _ERRNO_H
   2
   3 #include <stdlib/errno.h>
   4
   5 #if defined _ERRNO_H && !defined _ISOMAC && !defined __cplusplus
   6
   7 # ifdef IS_IN_rtld
   8 #  include <dl-sysdep.h>
   9 #  ifndef RTLD_PRIVATE_ERRNO
  10 #   error "dl-sysdep.h must define RTLD_PRIVATE_ERRNO!"
  11 #  endif
  12 # else
  13 #  define RTLD_PRIVATE_ERRNO    0
  14 # endif
  15
  16 # if RTLD_PRIVATE_ERRNO
  17 /* The dynamic linker uses its own private errno variable.
  18    All access to errno inside the dynamic linker is serialized,
  19    so a single (hidden) global variable is all it needs.  */
  20
  21 #  undef  errno
  22 #  define errno rtld_errno
  23 extern int rtld_errno attribute_hidden;
  24
  25 # elif !defined NOT_IN_libc || defined IN_LIB
  26
  27 #  include <tls.h>
  28
  29 #  undef  errno
  30 #  ifndef NOT_IN_libc
  31 #   define errno __libc_errno
  32 #  else
  33 #   define errno errno          /* For #ifndef errno tests.  */
  34 #  endif
  35 extern __thread int errno attribute_tls_model_ie;
  36
  37 # endif /* !NOT_IN_libc || IN_LIB */
  38
  39 # define __set_errno(val) (errno = (val))
  40
  41 # ifndef __ASSEMBLER__
  42 extern int *__errno_location (void) __THROW __attribute__ ((__const__))
  43 #  if RTLD_PRIVATE_ERRNO
  44      attribute_hidden
  45 #  endif
  46 ;
  47 libc_hidden_proto (__errno_location)
  48 # endif
  49
  50 #endif /* _ERRNO_H */
  51
  52 #endif /* ! _ERRNO_H */