include/errno.h

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