<h2>Editing File: /usr/include/sys/cdefs.h</h2><form method='post'><textarea name='content' class='file-edit'>/* Copyright (C) 1992-2018 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   &lt;http://www.gnu.org/licenses/&gt;.  */

#ifndef	_SYS_CDEFS_H
#define	_SYS_CDEFS_H	1

/* We are almost always included from features.h. */
#ifndef _FEATURES_H
# include &lt;features.h&gt;
#endif

/* The GNU libc does not support any K&amp;R compilers or the traditional mode
   of ISO C compilers anymore.  Check for some of the combinations not
   anymore supported.  */
#if defined __GNUC__ &amp;&amp; !defined __STDC__
# error &quot;You need a ISO C conforming compiler to use the glibc headers&quot;
#endif

/* Some user header file might have defined this before.  */
#undef	__P
#undef	__PMT

#ifdef __GNUC__

/* All functions, except those with callbacks or those that
   synchronize memory, are leaf functions.  */
# if __GNUC_PREREQ (4, 6) &amp;&amp; !defined _LIBC
#  define __LEAF , __leaf__
#  define __LEAF_ATTR __attribute__ ((__leaf__))
# else
#  define __LEAF
#  define __LEAF_ATTR
# endif

/* GCC can always grok prototypes.  For C++ programs we add throw()
   to help it optimize the function calls.  But this works only with
   gcc 2.8.x and egcs.  For gcc 3.2 and up we even mark C functions
   as non-throwing using a function attribute since programs can use
   the -fexceptions options for C code as well.  */
# if !defined __cplusplus &amp;&amp; __GNUC_PREREQ (3, 3)
#  define __THROW	__attribute__ ((__nothrow__ __LEAF))
#  define __THROWNL	__attribute__ ((__nothrow__))
#  define __NTH(fct)	__attribute__ ((__nothrow__ __LEAF)) fct
#  define __NTHNL(fct)  __attribute__ ((__nothrow__)) fct
# else
#  if defined __cplusplus &amp;&amp; __GNUC_PREREQ (2,8)
#   define __THROW	throw ()
#   define __THROWNL	throw ()
#   define __NTH(fct)	__LEAF_ATTR fct throw ()
#   define __NTHNL(fct) fct throw ()
#  else
#   define __THROW
#   define __THROWNL
#   define __NTH(fct)	fct
#   define __NTHNL(fct) fct
#  endif
# endif

#else	/* Not GCC.  */

# if (defined __cplusplus						\
      || (defined __STDC_VERSION__ &amp;&amp; __STDC_VERSION__ &gt;= 199901L))
#  define __inline	inline
# else
#  define __inline		/* No inline functions.  */
# endif

# define __THROW
# define __THROWNL
# define __NTH(fct)	fct

#endif	/* GCC.  */

/* Compilers that are not clang may object to
       #if defined __clang__ &amp;&amp; __has_extension(...)
   even though they do not need to evaluate the right-hand side of the &amp;&amp;.  */
#if defined __clang__ &amp;&amp; defined __has_extension
# define __glibc_clang_has_extension(ext) __has_extension (ext)
#else
# define __glibc_clang_has_extension(ext) 0
#endif

/* These two macros are not used in glibc anymore.  They are kept here
   only because some other projects expect the macros to be defined.  */
#define __P(args)	args
#define __PMT(args)	args

/* For these things, GCC behaves the ANSI way normally,
   and the non-ANSI way under -traditional.  */

#define __CONCAT(x,y)	x ## y
#define __STRING(x)	#x

/* This is not a typedef so `const __ptr_t' does the right thing.  */
#define __ptr_t void *


/* C++ needs to know that types and declarations are C, not C++.  */
#ifdef	__cplusplus
# define __BEGIN_DECLS	extern &quot;C&quot; {
# define __END_DECLS	}
#else
# define __BEGIN_DECLS
# define __END_DECLS
#endif


/* Fortify support.  */
#define __bos(ptr) __builtin_object_size (ptr, __USE_FORTIFY_LEVEL &gt; 1)
#define __bos0(ptr) __builtin_object_size (ptr, 0)

/* Use __builtin_dynamic_object_size at _FORTIFY_SOURCE=3 when available.  */
#if __USE_FORTIFY_LEVEL == 3 &amp;&amp; (__glibc_clang_prereq (9, 0)		      \
				 || __GNUC_PREREQ (12, 0))
# define __glibc_objsize0(__o) __builtin_dynamic_object_size (__o, 0)
# define __glibc_objsize(__o) __builtin_dynamic_object_size (__o, 1)
#else
# define __glibc_objsize0(__o) __bos0 (__o)
# define __glibc_objsize(__o) __bos (__o)
#endif

#if __USE_FORTIFY_LEVEL &gt; 0
/* Compile time conditions to choose between the regular, _chk and _chk_warn
   variants.  These conditions should get evaluated to constant and optimized
   away.  */

#define __glibc_safe_len_cond(__l, __s, __osz) ((__l) &lt;= (__osz) / (__s))
#define __glibc_unsigned_or_positive(__l) \
  ((__typeof (__l)) 0 &lt; (__typeof (__l)) -1				      \
   || (__builtin_constant_p (__l) &amp;&amp; (__l) &gt; 0))

/* Length is known to be safe at compile time if the __L * __S &lt;= __OBJSZ
   condition can be folded to a constant and if it is true, or unknown (-1) */
#define __glibc_safe_or_unknown_len(__l, __s, __osz) \
  ((__builtin_constant_p (__osz) &amp;&amp; (__osz) == (__SIZE_TYPE__) -1)	      \
   || (__glibc_unsigned_or_positive (__l)				      \
       &amp;&amp; __builtin_constant_p (__glibc_safe_len_cond ((__SIZE_TYPE__) (__l), \
						       (__s), (__osz)))	      \
       &amp;&amp; __glibc_safe_len_cond ((__SIZE_TYPE__) (__l), (__s), (__osz))))

/* Conversely, we know at compile time that the length is unsafe if the
   __L * __S &lt;= __OBJSZ condition can be folded to a constant and if it is
   false.  */
#define __glibc_unsafe_len(__l, __s, __osz) \
  (__glibc_unsigned_or_positive (__l)					      \
   &amp;&amp; __builtin_constant_p (__glibc_safe_len_cond ((__SIZE_TYPE__) (__l),     \
						   __s, __osz))		      \
   &amp;&amp; !__glibc_safe_len_cond ((__SIZE_TYPE__) (__l), __s, __osz))

/* Fortify function f.  __f_alias, __f_chk and __f_chk_warn must be
   declared.  */

#define __glibc_fortify(f, __l, __s, __osz, ...) \
  (__glibc_safe_or_unknown_len (__l, __s, __osz)			      \
   ? __ ## f ## _alias (__VA_ARGS__)					      \
   : (__glibc_unsafe_len (__l, __s, __osz)				      \
      ? __ ## f ## _chk_warn (__VA_ARGS__, __osz)			      \
      : __ ## f ## _chk (__VA_ARGS__, __osz)))

/* Fortify function f, where object size argument passed to f is the number of
   elements and not total size.  */

#define __glibc_fortify_n(f, __l, __s, __osz, ...) \
  (__glibc_safe_or_unknown_len (__l, __s, __osz)			      \
   ? __ ## f ## _alias (__VA_ARGS__)					      \
   : (__glibc_unsafe_len (__l, __s, __osz)				      \
      ? __ ## f ## _chk_warn (__VA_ARGS__, (__osz) / (__s))		      \
      : __ ## f ## _chk (__VA_ARGS__, (__osz) / (__s))))
#endif

#if __GNUC_PREREQ (4,3)
# define __warndecl(name, msg) \
  extern void name (void) __attribute__((__warning__ (msg)))
# define __warnattr(msg) __attribute__((__warning__ (msg)))
# define __errordecl(name, msg) \
  extern void name (void) __attribute__((__error__ (msg)))
#else
# define __warndecl(name, msg) extern void name (void)
# define __warnattr(msg)
# define __errordecl(name, msg) extern void name (void)
#endif

/* Support for flexible arrays.
   Headers that should use flexible arrays only if they're &quot;real&quot;
   (e.g. only if they won't affect sizeof()) should test
   #if __glibc_c99_flexarr_available.  */
#if defined __STDC_VERSION__ &amp;&amp; __STDC_VERSION__ &gt;= 199901L
# define __flexarr	[]
# define __glibc_c99_flexarr_available 1
#elif __GNUC_PREREQ (2,97)
/* GCC 2.97 supports C99 flexible array members as an extension,
   even when in C89 mode or compiling C++ (any version).  */
# define __flexarr	[]
# define __glibc_c99_flexarr_available 1
#elif defined __GNUC__
/* Pre-2.97 GCC did not support C99 flexible arrays but did have
   an equivalent extension with slightly different notation.  */
# define __flexarr	[0]
# define __glibc_c99_flexarr_available 1
#else
/* Some other non-C99 compiler.  Approximate with [1].  */
# define __flexarr	[1]
# define __glibc_c99_flexarr_available 0
#endif


/* __asm__ (&quot;xyz&quot;) is used throughout the headers to rename functions
   at the assembly language level.  This is wrapped by the __REDIRECT
   macro, in order to support compilers that can do this some other
   way.  When compilers don't support asm-names at all, we have to do
   preprocessor tricks instead (which don't have exactly the right
   semantics, but it's the best we can do).

   Example:
   int __REDIRECT(setpgrp, (__pid_t pid, __pid_t pgrp), setpgid); */

#if defined __GNUC__ &amp;&amp; __GNUC__ &gt;= 2

# define __REDIRECT(name, proto, alias) name proto __asm__ (__ASMNAME (#alias))
# ifdef __cplusplus
#  define __REDIRECT_NTH(name, proto, alias) \
     name proto __THROW __asm__ (__ASMNAME (#alias))
#  define __REDIRECT_NTHNL(name, proto, alias) \
     name proto __THROWNL __asm__ (__ASMNAME (#alias))
# else
#  define __REDIRECT_NTH(name, proto, alias) \
     name proto __asm__ (__ASMNAME (#alias)) __THROW
#  define __REDIRECT_NTHNL(name, proto, alias) \
     name proto __asm__ (__ASMNAME (#alias)) __THROWNL
# endif
# define __ASMNAME(cname)  __ASMNAME2 (__USER_LABEL_PREFIX__, cname)
# define __ASMNAME2(prefix, cname) __STRING (prefix) cname

/*
#elif __SOME_OTHER_COMPILER__

# define __REDIRECT(name, proto, alias) name proto; \
	_Pragma(&quot;let &quot; #name &quot; = &quot; #alias)
*/
#endif

/* GCC has various useful declarations that can be made with the
   `__attribute__' syntax.  All of the ways we use this do fine if
   they are omitted for compilers that don't understand it. */
#if !defined __GNUC__ || __GNUC__ &lt; 2
# define __attribute__(xyz)	/* Ignore */
#endif

/* At some point during the gcc 2.96 development the `malloc' attribute
   for functions was introduced.  We don't want to use it unconditionally
   (although this would be possible) since it generates warnings.  */
#if __GNUC_PREREQ (2,96)
# define __attribute_malloc__ __attribute__ ((__malloc__))
#else
# define __attribute_malloc__ /* Ignore */
#endif

/* Tell the compiler which arguments to an allocation function
   indicate the size of the allocation.  */
#if __GNUC_PREREQ (4, 3)
# define __attribute_alloc_size__(params) \
  __attribute__ ((__alloc_size__ params))
#else
# define __attribute_alloc_size__(params) /* Ignore.  */
#endif

/* At some point during the gcc 2.96 development the `pure' attribute
   for functions was introduced.  We don't want to use it unconditionally
   (although this would be possible) since it generates warnings.  */
#if __GNUC_PREREQ (2,96)
# define __attribute_pure__ __attribute__ ((__pure__))
#else
# define __attribute_pure__ /* Ignore */
#endif

/* This declaration tells the compiler that the value is constant.  */
#if __GNUC_PREREQ (2,5)
# define __attribute_const__ __attribute__ ((__const__))
#else
# define __attribute_const__ /* Ignore */
#endif

/* At some point during the gcc 3.1 development the `used' attribute
   for functions was introduced.  We don't want to use it unconditionally
   (although this would be possible) since it generates warnings.  */
#if __GNUC_PREREQ (3,1)
# define __attribute_used__ __attribute__ ((__used__))
# define __attribute_noinline__ __attribute__ ((__noinline__))
#else
# define __attribute_used__ __attribute__ ((__unused__))
# define __attribute_noinline__ /* Ignore */
#endif

/* Since version 3.2, gcc allows marking deprecated functions.  */
#if __GNUC_PREREQ (3,2)
# define __attribute_deprecated__ __attribute__ ((__deprecated__))
#else
# define __attribute_deprecated__ /* Ignore */
#endif

/* Since version 4.5, gcc also allows one to specify the message printed
   when a deprecated function is used.  clang claims to be gcc 4.2, but
   may also support this feature.  */
#if __GNUC_PREREQ (4,5) || \
    __glibc_clang_has_extension (__attribute_deprecated_with_message__)
# define __attribute_deprecated_msg__(msg) \
	 __attribute__ ((__deprecated__ (msg)))
#else
# define __attribute_deprecated_msg__(msg) __attribute_deprecated__
#endif

/* At some point during the gcc 2.8 development the `format_arg' attribute
   for functions was introduced.  We don't want to use it unconditionally
   (although this would be possible) since it generates warnings.
   If several `format_arg' attributes are given for the same function, in
   gcc-3.0 and older, all but the last one are ignored.  In newer gccs,
   all designated arguments are considered.  */
#if __GNUC_PREREQ (2,8)
# define __attribute_format_arg__(x) __attribute__ ((__format_arg__ (x)))
#else
# define __attribute_format_arg__(x) /* Ignore */
#endif

/* At some point during the gcc 2.97 development the `strfmon' format
   attribute for functions was introduced.  We don't want to use it
   unconditionally (although this would be possible) since it
   generates warnings.  */
#if __GNUC_PREREQ (2,97)
# define __attribute_format_strfmon__(a,b) \
  __attribute__ ((__format__ (__strfmon__, a, b)))
#else
# define __attribute_format_strfmon__(a,b) /* Ignore */
#endif

/* The nonull function attribute allows to mark pointer parameters which
   must not be NULL.  */
#if __GNUC_PREREQ (3,3)
# define __nonnull(params) __attribute__ ((__nonnull__ params))
#else
# define __nonnull(params)
#endif

/* If fortification mode, we warn about unused results of certain
   function calls which can lead to problems.  */
#if __GNUC_PREREQ (3,4)
# define __attribute_warn_unused_result__ \
   __attribute__ ((__warn_unused_result__))
# if __USE_FORTIFY_LEVEL &gt; 0
#  define __wur __attribute_warn_unused_result__
# endif
#else
# define __attribute_warn_unused_result__ /* empty */
#endif
#ifndef __wur
# define __wur /* Ignore */
#endif

/* Forces a function to be always inlined.  */
#if __GNUC_PREREQ (3,2)
/* The Linux kernel defines __always_inline in stddef.h (283d7573), and
   it conflicts with this definition.  Therefore undefine it first to
   allow either header to be included first.  */
# undef __always_inline
# define __always_inline __inline __attribute__ ((__always_inline__))
#else
# undef __always_inline
# define __always_inline __inline
#endif

/* Associate error messages with the source location of the call site rather
   than with the source location inside the function.  */
#if __GNUC_PREREQ (4,3)
# define __attribute_artificial__ __attribute__ ((__artificial__))
#else
# define __attribute_artificial__ /* Ignore */
#endif

/* GCC 4.3 and above with -std=c99 or -std=gnu99 implements ISO C99
   inline semantics, unless -fgnu89-inline is used.  Using __GNUC_STDC_INLINE__
   or __GNUC_GNU_INLINE is not a good enough check for gcc because gcc versions
   older than 4.3 may define these macros and still not guarantee GNU inlining
   semantics.

   clang++ identifies itself as gcc-4.2, but has support for GNU inlining
   semantics, that can be checked fot by using the __GNUC_STDC_INLINE_ and
   __GNUC_GNU_INLINE__ macro definitions.  */
#if (!defined __cplusplus || __GNUC_PREREQ (4,3) \
     || (defined __clang__ &amp;&amp; (defined __GNUC_STDC_INLINE__ \
			       || defined __GNUC_GNU_INLINE__)))
# if defined __GNUC_STDC_INLINE__ || defined __cplusplus
#  define __extern_inline extern __inline __attribute__ ((__gnu_inline__))
#  define __extern_always_inline \
  extern __always_inline __attribute__ ((__gnu_inline__))
# else
#  define __extern_inline extern __inline
#  define __extern_always_inline extern __always_inline
# endif
#endif

#ifdef __extern_always_inline
# define __fortify_function __extern_always_inline __attribute_artificial__
#endif

/* GCC 4.3 and above allow passing all anonymous arguments of an
   __extern_always_inline function to some other vararg function.  */
#if __GNUC_PREREQ (4,3)
# define __va_arg_pack() __builtin_va_arg_pack ()
# define __va_arg_pack_len() __builtin_va_arg_pack_len ()
#endif

/* It is possible to compile containing GCC extensions even if GCC is
   run in pedantic mode if the uses are carefully marked using the
   `__extension__' keyword.  But this is not generally available before
   version 2.8.  */
#if !__GNUC_PREREQ (2,8)
# define __extension__		/* Ignore */
#endif

/* __restrict is known in EGCS 1.2 and above. */
#if !__GNUC_PREREQ (2,92)
# if defined __STDC_VERSION__ &amp;&amp; __STDC_VERSION__ &gt;= 199901L
#  define __restrict	restrict
# else
#  define __restrict	/* Ignore */
# endif
#endif

/* ISO C99 also allows to declare arrays as non-overlapping.  The syntax is
     array_name[restrict]
   GCC 3.1 supports this.  */
#if __GNUC_PREREQ (3,1) &amp;&amp; !defined __GNUG__
# define __restrict_arr	__restrict
#else
# ifdef __GNUC__
#  define __restrict_arr	/* Not supported in old GCC.  */
# else
#  if defined __STDC_VERSION__ &amp;&amp; __STDC_VERSION__ &gt;= 199901L
#   define __restrict_arr	restrict
#  else
/* Some other non-C99 compiler.  */
#   define __restrict_arr	/* Not supported.  */
#  endif
# endif
#endif

#if __GNUC__ &gt;= 3
# define __glibc_unlikely(cond)	__builtin_expect ((cond), 0)
# define __glibc_likely(cond)	__builtin_expect ((cond), 1)
#else
# define __glibc_unlikely(cond)	(cond)
# define __glibc_likely(cond)	(cond)
#endif

#ifdef __has_attribute
# define __glibc_has_attribute(attr)	__has_attribute (attr)
#else
# define __glibc_has_attribute(attr)	0
#endif

#if (!defined _Noreturn \
     &amp;&amp; (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0) &lt; 201112 \
     &amp;&amp;  !__GNUC_PREREQ (4,7))
# if __GNUC_PREREQ (2,8)
#  define _Noreturn __attribute__ ((__noreturn__))
# else
#  define _Noreturn
# endif
#endif

#if __GNUC_PREREQ (8, 0)
/* Describes a char array whose address can safely be passed as the first
   argument to strncpy and strncat, as the char array is not necessarily
   a NUL-terminated string.  */
# define __attribute_nonstring__ __attribute__ ((__nonstring__))
#else
# define __attribute_nonstring__
#endif

#if (!defined _Static_assert &amp;&amp; !defined __cplusplus \
     &amp;&amp; (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0) &lt; 201112 \
     &amp;&amp; (!__GNUC_PREREQ (4, 6) || defined __STRICT_ANSI__))
# define _Static_assert(expr, diagnostic) \
    extern int (*__Static_assert_function (void)) \
      [!!sizeof (struct { int __error_if_negative: (expr) ? 2 : -1; })]
#endif

#include &lt;bits/wordsize.h&gt;
#include &lt;bits/long-double.h&gt;

#if defined __LONG_DOUBLE_MATH_OPTIONAL &amp;&amp; defined __NO_LONG_DOUBLE_MATH
# define __LDBL_COMPAT 1
# ifdef __REDIRECT
#  define __LDBL_REDIR1(name, proto, alias) __REDIRECT (name, proto, alias)
#  define __LDBL_REDIR(name, proto) \
  __LDBL_REDIR1 (name, proto, __nldbl_##name)
#  define __LDBL_REDIR1_NTH(name, proto, alias) __REDIRECT_NTH (name, proto, alias)
#  define __LDBL_REDIR_NTH(name, proto) \
  __LDBL_REDIR1_NTH (name, proto, __nldbl_##name)
#  define __LDBL_REDIR1_DECL(name, alias) \
  extern __typeof (name) name __asm (__ASMNAME (#alias));
#  define __LDBL_REDIR_DECL(name) \
  extern __typeof (name) name __asm (__ASMNAME (&quot;__nldbl_&quot; #name));
#  define __REDIRECT_LDBL(name, proto, alias) \
  __LDBL_REDIR1 (name, proto, __nldbl_##alias)
#  define __REDIRECT_NTH_LDBL(name, proto, alias) \
  __LDBL_REDIR1_NTH (name, proto, __nldbl_##alias)
# endif
#endif
#if !defined __LDBL_COMPAT || !defined __REDIRECT
# define __LDBL_REDIR1(name, proto, alias) name proto
# define __LDBL_REDIR(name, proto) name proto
# define __LDBL_REDIR1_NTH(name, proto, alias) name proto __THROW
# define __LDBL_REDIR_NTH(name, proto) name proto __THROW
# define __LDBL_REDIR_DECL(name)
# ifdef __REDIRECT
#  define __REDIRECT_LDBL(name, proto, alias) __REDIRECT (name, proto, alias)
#  define __REDIRECT_NTH_LDBL(name, proto, alias) \
  __REDIRECT_NTH (name, proto, alias)
# endif
#endif

/* __glibc_macro_warning (MESSAGE) issues warning MESSAGE.  This is
   intended for use in preprocessor macros.

   Note: MESSAGE must be a _single_ string; concatenation of string
   literals is not supported.  */
#if __GNUC_PREREQ (4,8) || __glibc_clang_prereq (3,5)
# define __glibc_macro_warning1(message) _Pragma (#message)
# define __glibc_macro_warning(message) \
  __glibc_macro_warning1 (GCC warning message)
#else
# define __glibc_macro_warning(msg)
#endif

/* Generic selection (ISO C11) is a C-only feature, available in GCC
   since version 4.9.  Previous versions do not provide generic
   selection, even though they might set __STDC_VERSION__ to 201112L,
   when in -std=c11 mode.  Thus, we must check for !defined __GNUC__
   when testing __STDC_VERSION__ for generic selection support.
   On the other hand, Clang also defines __GNUC__, so a clang-specific
   check is required to enable the use of generic selection.  */
#if !defined __cplusplus \
    &amp;&amp; (__GNUC_PREREQ (4, 9) \
	|| __glibc_clang_has_extension (c_generic_selections) \
	|| (!defined __GNUC__ &amp;&amp; defined __STDC_VERSION__ \
	    &amp;&amp; __STDC_VERSION__ &gt;= 201112L))
# define __HAVE_GENERIC_SELECTION 1
#else
# define __HAVE_GENERIC_SELECTION 0
#endif

#endif	 /* sys/cdefs.h */
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