mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-18 11:00:07 +00:00
9b21e6bcf8
* include/libc-symbols.h (attribute_tls_model_ie): Define.
* include/errno.h (errno): Define to __libc_errno in libc.so.
Add attribute_tls_model_ie.
* include/netdb.h (h_errno): Define to __libc_h_errno in libc.so.
Add attribute_tls_model_ie.
* include/resolv.h (_res): Define to __libc_res in libc.so. Add
attribute_tls_model_ie.
* inet/herrno.c (__libc_h_errno): Add hidden alias to h_errno.
(h_errno): Define.
* resolv/res_libc.c (__libc_res): Add hidden alias to _res.
(_res): Define.
* sysdeps/generic/bits/libc-tsd.h (__libc_tsd_define): Add
attribute_tls_model_ie.
* sysdeps/generic/errno-loc.c (errno): Only undefine if not using
__thread.
* sysdeps/generic/errno.c (__libc_errno): Add hidden alias to errno.
* sysdeps/unix/sysv/linux/i386/sysdep.h (SYSCALL_ERROR_HANDLER): Use
__libc_errno in USE___THREAD case.
* sysdeps/unix/sysv/linux/x86_64/sysdep.h (SYSCALL_ERROR_HANDLER):
Likewise.
* configure.in (HAVE_TLS_MODEL_ATTRIBUTE): Check for
__attribute__((tls_model (""))).
* configure: Rebuilt.
* config.h.in (HAVE_TLS_MODEL_ATTRIBUTE): Add.
101 lines
3.3 KiB
C
101 lines
3.3 KiB
C
/*
|
||
* 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.
|
||
*/
|
||
|
||
#include <sys/types.h>
|
||
#include <netinet/in.h>
|
||
#include <arpa/nameser.h>
|
||
#include <resolv.h>
|
||
|
||
#undef _res
|
||
|
||
#include <tls.h>
|
||
|
||
#if USE_TLS && HAVE___THREAD
|
||
/* With __thread support, this per-thread variable is used in all cases. */
|
||
__thread struct __res_state _res;
|
||
extern __thread struct __res_state __libc_res __attribute__ ((alias ("_res")))
|
||
attribute_hidden;
|
||
# define _res __libc_res
|
||
#else
|
||
/* The resolver state for use by single-threaded programs. */
|
||
struct __res_state _res;
|
||
#endif
|
||
|
||
/* This function is used to access the resolver state in
|
||
single-threaded programs. */
|
||
struct __res_state *
|
||
weak_const_function
|
||
__res_state (void)
|
||
{
|
||
return &_res;
|
||
}
|
||
|
||
|
||
/* The following bit is copied from res_data.c (where it is #ifdef'ed
|
||
out) since res_init() should go into libc.so but the rest of that
|
||
file should not. */
|
||
|
||
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 = 4;
|
||
if (!(_res.options & RES_INIT))
|
||
_res.options = RES_DEFAULT;
|
||
|
||
/*
|
||
* 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();
|
||
|
||
return (__res_vinit(&_res, 1));
|
||
}
|
||
|
||
|
||
#include <shlib-compat.h>
|
||
|
||
#if SHLIB_COMPAT(libc, GLIBC_2_0, GLIBC_2_2)
|
||
# undef res_init
|
||
strong_alias (__res_init, __res_init_weak);
|
||
weak_extern (__res_init_weak);
|
||
compat_symbol (libc, __res_init_weak, res_init, GLIBC_2_0);
|
||
#endif
|