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Diffstat (limited to 'resolv/res_libc.c')
| -rw-r--r-- | resolv/res_libc.c | 144 |
1 files changed, 0 insertions, 144 deletions
diff --git a/resolv/res_libc.c b/resolv/res_libc.c deleted file mode 100644 index c8f158d94c..0000000000 --- a/resolv/res_libc.c +++ /dev/null @@ -1,144 +0,0 @@ -/* - * Copyright (c) 1995-1999 by Internet Software Consortium. - * - * Permission to use, copy, modify, and distribute this software for any - * purpose with or without fee is hereby granted, provided that the above - * copyright notice and this permission notice appear in all copies. - * - * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS - * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES - * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE - * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL - * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR - * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS - * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS - * SOFTWARE. - */ - -/* This file contains the definitions related to res_init which are - linked into libc instead of libresolv. */ - -#include <atomic.h> -#include <limits.h> -#include <sys/types.h> -#include <netinet/in.h> -#include <arpa/nameser.h> -#include <resolv.h> -#include <libc-lock.h> - -extern unsigned long long int __res_initstamp attribute_hidden; -/* We have atomic increment operations on 64-bit platforms. */ -#if __WORDSIZE == 64 -# define atomicinclock(lock) (void) 0 -# define atomicincunlock(lock) (void) 0 -# define atomicinc(var) catomic_increment (&(var)) -#else -__libc_lock_define_initialized (static, lock); -# define atomicinclock(lock) __libc_lock_lock (lock) -# define atomicincunlock(lock) __libc_lock_unlock (lock) -# define atomicinc(var) ++var -#endif - -int -res_init(void) { - extern int __res_vinit(res_state, int); - - /* - * These three fields used to be statically initialized. This made - * it hard to use this code in a shared library. It is necessary, - * now that we're doing dynamic initialization here, that we preserve - * the old semantics: if an application modifies one of these three - * fields of _res before res_init() is called, res_init() will not - * alter them. Of course, if an application is setting them to - * _zero_ before calling res_init(), hoping to override what used - * to be the static default, we can't detect it and unexpected results - * will follow. Zero for any of these fields would make no sense, - * so one can safely assume that the applications were already getting - * unexpected results. - * - * _res.options is tricky since some apps were known to diddle the bits - * before res_init() was first called. We can't replicate that semantic - * with dynamic initialization (they may have turned bits off that are - * set in RES_DEFAULT). Our solution is to declare such applications - * "broken". They could fool us by setting RES_INIT but none do (yet). - */ - if (!_res.retrans) - _res.retrans = RES_TIMEOUT; - if (!_res.retry) - _res.retry = RES_DFLRETRY; - if (!(_res.options & RES_INIT)) - _res.options = RES_DEFAULT; - else if (_res.nscount > 0) - __res_iclose (&_res, true); /* Close any VC sockets. */ - - /* - * This one used to initialize implicitly to zero, so unless the app - * has set it to something in particular, we can randomize it now. - */ - if (!_res.id) - _res.id = res_randomid(); - - atomicinclock (lock); - /* Request all threads to re-initialize their resolver states, - resolv.conf might have changed. */ - atomicinc (__res_initstamp); - atomicincunlock (lock); - - return (__res_vinit(&_res, 1)); -} - -/* Initialize resp if RES_INIT is not yet set or if res_init in some other - thread requested re-initializing. */ -int -__res_maybe_init (res_state resp, int preinit) -{ - if (resp->options & RES_INIT) { - if (__res_initstamp != resp->_u._ext.initstamp) { - if (resp->nscount > 0) - __res_iclose (resp, true); - return __res_vinit (resp, 1); - } - return 0; - } else if (preinit) { - if (!resp->retrans) - resp->retrans = RES_TIMEOUT; - if (!resp->retry) - resp->retry = RES_DFLRETRY; - resp->options = RES_DEFAULT; - if (!resp->id) - resp->id = res_randomid (); - return __res_vinit (resp, 1); - } else - return __res_ninit (resp); -} -libc_hidden_def (__res_maybe_init) - -/* This needs to be after the use of _res in res_init, above. */ -#undef _res - -/* The resolver state for use by single-threaded programs. - This differs from plain `struct __res_state _res;' in that it doesn't - create a common definition, but a plain symbol that resides in .bss, - which can have an alias. */ -struct __res_state _res __attribute__ ((nocommon)); - -#undef __resp -__thread struct __res_state *__resp = &_res; -extern __thread struct __res_state *__libc_resp - __attribute__ ((alias ("__resp"))) attribute_hidden; - -#include <shlib-compat.h> - -/* We declare this with compat_symbol so that it's not - visible at link time. Programs must use the accessor functions. */ -#ifdef SHARED -compat_symbol (libc, _res, _res, GLIBC_2_0); -#endif - -#if SHLIB_COMPAT(libc, GLIBC_2_0, GLIBC_2_2) -# undef res_init -extern int __res_init_weak (void); -weak_extern (__res_init_weak); -strong_alias (__res_init, __res_init_weak); -compat_symbol (libc, __res_init_weak, res_init, GLIBC_2_0); -#endif |