Blame include/errno.h

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#ifndef _ERRNO_H
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#include <stdlib/errno.h>
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#if !defined _ISOMAC && !defined __ASSEMBLER__
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# if IS_IN (rtld)
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#  include <dl-sysdep.h>
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#  ifndef RTLD_PRIVATE_ERRNO
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#   error "dl-sysdep.h must define RTLD_PRIVATE_ERRNO!"
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#  endif
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# else
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#  define RTLD_PRIVATE_ERRNO	0
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# endif
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# if RTLD_PRIVATE_ERRNO
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/* The dynamic linker uses its own private errno variable.
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   All access to errno inside the dynamic linker is serialized,
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   so a single (hidden) global variable is all it needs.  */
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#  undef  errno
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#  define errno rtld_errno
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extern int rtld_errno attribute_hidden;
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# elif IS_IN_LIB && !IS_IN (rtld)
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#  include <tls.h>
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#  undef  errno
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#  if IS_IN (libc)
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#   define errno __libc_errno
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#  else
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#   define errno errno		/* For #ifndef errno tests.  */
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#  endif
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extern __thread int errno attribute_tls_model_ie;
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# endif	/* IS_IN_LIB */
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# define __set_errno(val) (errno = (val))
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extern int *__errno_location (void) __THROW __attribute_const__
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#  if RTLD_PRIVATE_ERRNO
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     attribute_hidden
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#  endif
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;
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libc_hidden_proto (__errno_location)
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#endif /* !_ISOMAC && !__ASSEMBLER__ */
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#endif /* !_ERRNO_H */