132 lines
5.3 KiB
C
132 lines
5.3 KiB
C
/*
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* Copyright (c) 2011, 2012, 2013, 2015 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* sys/cdefs.h
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* Declares internal macros for the C programming language.
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*/
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#ifndef _INCLUDE_SYS_CDEFS_H
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#define _INCLUDE_SYS_CDEFS_H
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#include <features.h>
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/* Preprocessor trick to turn anything into a string. */
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#define __STRINGIFY(x) #x
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/* Issue warning when this is used, except in defines, where the warning is
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inserted whenever the macro is expanded. This can be used to deprecated
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macros - and it happens on preprocessor level - so it shouldn't change any
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semantics of any code that uses such a macro. The argument msg should be a
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string that contains the warning. */
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#define __PRAGMA_WARNING(msg) _Pragma(__STRINGIFY(GCC warning msg))
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/* Use the real restrict keyword if it is available. Not that this really
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matters as gcc uses __restrict and __restrict__ as aliases for restrict, but
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it will look nicer after preprocessing. */
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#if __HAS_RESTRICT
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#undef __restrict
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#define __restrict restrict
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#endif
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/* Provide the restrict keyword if requested and unavailable. */
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#if !__HAS_RESTRICT && __want_restrict
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#define restrict __restrict
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#undef __HAS_RESTRICT
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#define __HAS_RESTRICT 2
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#endif
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/* Macro to declare a weak alias. */
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#if defined(__is_sortix_libc)
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#define weak_alias(old, new) \
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extern __typeof(old) new __attribute__((weak, alias(#old)))
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#endif
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#define __pure2 __attribute__((__const__))
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/*
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* Compatibility macros to advertise to ports when features become available.
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* These macros are only for things that are not trivial to detect from a C
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* source file (such as by a standard macro).
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*
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* The feature foo should initially have an undef preprocessor statement of the
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* macro __SORTIX_HAS_FOO__ (or something like that). It should carry a TODO
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* comment stating:
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*
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* - What the feature is and when the macro should become defined.
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* - Which ports (if any) rely on this macro and will use the feature whenever
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* the macro is defined.
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* - That the macro should be removed when the specific ports have been updated
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* to no longer rely on the macro. If no ports used the feature in the first
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* place, it should say to remove the macro when the feature is implemented.
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*
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* The undef statement should become a define statement when the feature is
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* implemented. As the each port is updated after that, the feature should
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* become unconditionally used in the port, and the port is removed from the
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* list here. Finally, when the list is empty, the macro is removed entirely.
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*
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* For instance, the TODO statement for the feature foo with the undef'd macro
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* __SORTIX_HAS_FOO__ might say:
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*
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* "Define when foo is implemented. Remove when libbar, libqux, and libbaz are
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* updated to not rely on this macro."
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*
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* Should a port become broken if a macro is defined here, the port should be
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* fixed (by either fixing it or disabling the feature in the port regardless
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* of the macro) before the macro is officially enabled here.
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*/
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/* TODO: Define when floating point formating is implemented. Remove when gawk
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is updated to not rely on this macro. */
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#undef __SORTIX_HAS_FORMAT_FLOAT__
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/* TODO: Define when floating point parsing is implemented. No ports are using
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this macro at this time. Remove when the feature is implemented. */
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#undef __SORTIX_HAS_FLOAT_PARSE__
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/* TODO: Define when restartable system calls are implemented. Remove when git
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is updated to not rely on this macro. */
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#undef __SORTIX_HAS_RESTARTABLE_SYSCALLS__
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/* TODO: Define when general user security is implemented. Remove when ssh is
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updated to not rely on this macro. */
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#undef __SORTIX_HAS_UID_SECURITY__
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/* TODO: Define when mmap MAP_SHARED works properly. Remove when ssh is updated
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to not rely on this macro. */
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#undef __SORTIX_HAS_WORKING_MAP_SHARED__
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/* TODO: Define when shared memory, file descriptor passing, and general user
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security are implemented. Remove when ssh is updated to not rely on
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this macro. */
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#undef __SORTIX_HAS_WORKING_PRIVSEP__
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/* TODO: Define when initgroups(2) is implemented. Remove when libdbus and ssh
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are updated not rely on this macro. */
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#undef __SORTIX_HAS_INITGROUPS__
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/* TODO: Define when setgroups(2) is implemented. Remove when libdbus and ssh
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are updated not rely on this macro. */
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#undef __SORTIX_HAS_SETGROUPS__
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/* TODO: Define when getgroups(2) is implemented. Remove when ssh is updated to
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not rely on this macro. */
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#undef __SORTIX_HAS_GETGROUPS__
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/* TODO: Define when getservbyname(3) is implemented and works. Remove when ssh
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is updated to not rely on this macro. */
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#undef __SORTIX_HAS_GETSERVBYNAME__
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#endif
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