146 строки
4.7 KiB
C
146 строки
4.7 KiB
C
#ifndef __CARES_RULES_H
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#define __CARES_RULES_H
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/* $Id$ */
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/* Copyright (C) 2009 by Daniel Stenberg et al
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*
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* Permission to use, copy, modify, and distribute this software and its
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* documentation for any purpose and without fee is hereby granted, provided
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* that the above copyright notice appear in all copies and that both that
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* copyright notice and this permission notice appear in supporting
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* documentation, and that the name of M.I.T. not be used in advertising or
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* publicity pertaining to distribution of the software without specific,
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* written prior permission. M.I.T. makes no representations about the
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* suitability of this software for any purpose. It is provided "as is"
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* without express or implied warranty.
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*/
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/* ================================================================ */
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/* COMPILE TIME SANITY CHECKS */
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/* ================================================================ */
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/*
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* NOTE 1:
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* -------
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*
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* All checks done in this file are intentionally placed in a public
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* header file which is pulled by ares.h when an application is
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* being built using an already built c-ares library. Additionally
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* this file is also included and used when building the library.
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*
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* If compilation fails on this file it is certainly sure that the
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* problem is elsewhere. It could be a problem in the ares_build.h
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* header file, or simply that you are using different compilation
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* settings than those used to build the library.
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*
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* Nothing in this file is intended to be modified or adjusted by the
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* c-ares library user nor by the c-ares library builder.
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*
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* Do not deactivate any check, these are done to make sure that the
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* library is properly built and used.
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*
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* You can find further help on the c-ares development mailing list:
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* http://cool.haxx.se/mailman/listinfo/c-ares/
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*
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* NOTE 2
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* ------
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*
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* Some of the following compile time checks are based on the fact
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* that the dimension of a constant array can not be a negative one.
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* In this way if the compile time verification fails, the compilation
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* will fail issuing an error. The error description wording is compiler
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* dependant but it will be quite similar to one of the following:
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*
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* "negative subscript or subscript is too large"
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* "array must have at least one element"
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* "-1 is an illegal array size"
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* "size of array is negative"
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*
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* If you are building an application which tries to use an already
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* built c-ares library and you are getting this kind of errors on
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* this file, it is a clear indication that there is a mismatch between
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* how the library was built and how you are trying to use it for your
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* application. Your already compiled or binary library provider is the
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* only one who can give you the details you need to properly use it.
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*/
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/*
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* Verify that some macros are actually defined.
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*/
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#ifndef CARES_SIZEOF_LONG
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# error "CARES_SIZEOF_LONG definition is missing!"
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Error Compilation_aborted_CARES_SIZEOF_LONG_is_missing
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#endif
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#ifndef CARES_TYPEOF_ARES_SOCKLEN_T
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# error "CARES_TYPEOF_ARES_SOCKLEN_T definition is missing!"
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Error Compilation_aborted_CARES_TYPEOF_ARES_SOCKLEN_T_is_missing
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#endif
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#ifndef CARES_SIZEOF_ARES_SOCKLEN_T
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# error "CARES_SIZEOF_ARES_SOCKLEN_T definition is missing!"
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Error Compilation_aborted_CARES_SIZEOF_ARES_SOCKLEN_T_is_missing
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#endif
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/*
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* Macros private to this header file.
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*/
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#define CareschkszEQ(t, s) sizeof(t) == s ? 1 : -1
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#define CareschkszGE(t1, t2) sizeof(t1) >= sizeof(t2) ? 1 : -1
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/*
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* Verify that the size previously defined and expected for long
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* is the same as the one reported by sizeof() at compile time.
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*/
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typedef char
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__cares_rule_01__
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[CareschkszEQ(long, CARES_SIZEOF_LONG)];
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/*
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* Verify that the size previously defined and expected for
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* ares_socklen_t is actually the the same as the one reported
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* by sizeof() at compile time.
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*/
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typedef char
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__cares_rule_02__
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[CareschkszEQ(ares_socklen_t, CARES_SIZEOF_ARES_SOCKLEN_T)];
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/*
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* Verify at compile time that the size of ares_socklen_t as reported
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* by sizeof() is greater or equal than the one reported for int for
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* the current compilation.
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*/
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typedef char
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__cares_rule_03__
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[CareschkszGE(ares_socklen_t, int)];
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/* ================================================================ */
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/* EXTERNALLY AND INTERNALLY VISIBLE DEFINITIONS */
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/* ================================================================ */
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/*
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* Get rid of macros private to this header file.
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*/
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#undef CareschkszEQ
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#undef CareschkszGE
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/*
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* Get rid of macros not intended to exist beyond this point.
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*/
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#undef CARES_PULL_WS2TCPIP_H
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#undef CARES_PULL_SYS_TYPES_H
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#undef CARES_PULL_SYS_SOCKET_H
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#undef CARES_TYPEOF_ARES_SOCKLEN_T
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#endif /* __CARES_RULES_H */
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