/* Error handling for runtime dynamic linker.
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/* Error handling for runtime dynamic linker.
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Copyright (C) 1995,96,97,98,99,2000,2001 Free Software Foundation, Inc.
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Copyright (C) 1995,96,97,98,99,2000,2001 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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02111-1307 USA. */
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#include <libintl.h>
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#include <libintl.h>
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#include <setjmp.h>
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#include <setjmp.h>
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#include <stdlib.h>
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#include <stdlib.h>
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#include <string.h>
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#include <string.h>
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#include <unistd.h>
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#include <unistd.h>
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#include <ldsodefs.h>
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#include <ldsodefs.h>
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#include <sys/libc-tsd.h>
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#include <sys/libc-tsd.h>
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/* This structure communicates state between _dl_catch_error and
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/* This structure communicates state between _dl_catch_error and
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_dl_signal_error. */
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_dl_signal_error. */
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struct catch
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struct catch
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{
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{
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const char *objname; /* Object/File name. */
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const char *objname; /* Object/File name. */
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const char *errstring; /* Error detail filled in here. */
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const char *errstring; /* Error detail filled in here. */
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jmp_buf env; /* longjmp here on error. */
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jmp_buf env; /* longjmp here on error. */
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};
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};
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/* Multiple threads at once can use the `_dl_catch_error' function. The
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/* Multiple threads at once can use the `_dl_catch_error' function. The
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calls can come from `_dl_map_object_deps', `_dlerror_run', or from
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calls can come from `_dl_map_object_deps', `_dlerror_run', or from
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any of the libc functionality which loads dynamic objects (NSS, iconv).
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any of the libc functionality which loads dynamic objects (NSS, iconv).
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Therefore we have to be prepared to save the state in thread-local
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Therefore we have to be prepared to save the state in thread-local
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memory. */
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memory. */
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__libc_tsd_define (static, DL_ERROR)
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__libc_tsd_define (static, DL_ERROR)
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#define tsd_getspecific() __libc_tsd_get (DL_ERROR)
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#define tsd_getspecific() __libc_tsd_get (DL_ERROR)
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#define tsd_setspecific(data) __libc_tsd_set (DL_ERROR, (data))
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#define tsd_setspecific(data) __libc_tsd_set (DL_ERROR, (data))
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/* This message we return as a last resort. We define the string in a
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/* This message we return as a last resort. We define the string in a
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variable since we have to avoid freeing it and so have to enable
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variable since we have to avoid freeing it and so have to enable
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a pointer comparison. See below and in dlfcn/dlerror.c. */
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a pointer comparison. See below and in dlfcn/dlerror.c. */
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const char _dl_out_of_memory[] = "out of memory";
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const char _dl_out_of_memory[] = "out of memory";
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/* This points to a function which is called when an continuable error is
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/* This points to a function which is called when an continuable error is
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received. Unlike the handling of `catch' this function may return.
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received. Unlike the handling of `catch' this function may return.
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The arguments will be the `errstring' and `objname'.
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The arguments will be the `errstring' and `objname'.
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Since this functionality is not used in normal programs (only in ld.so)
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Since this functionality is not used in normal programs (only in ld.so)
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we do not care about multi-threaded programs here. We keep this as a
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we do not care about multi-threaded programs here. We keep this as a
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global variable. */
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global variable. */
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static receiver_fct receiver;
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static receiver_fct receiver;
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void
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void
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internal_function
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internal_function
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_dl_signal_error (int errcode, const char *objname, const char *occation,
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_dl_signal_error (int errcode, const char *objname, const char *occation,
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const char *errstring)
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const char *errstring)
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{
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{
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struct catch *lcatch;
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struct catch *lcatch;
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if (! errstring)
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if (! errstring)
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errstring = N_("DYNAMIC LINKER BUG!!!");
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errstring = N_("DYNAMIC LINKER BUG!!!");
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lcatch = tsd_getspecific ();
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lcatch = tsd_getspecific ();
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if (objname == NULL)
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if (objname == NULL)
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objname = "";
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objname = "";
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if (lcatch != NULL)
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if (lcatch != NULL)
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{
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{
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/* We are inside _dl_catch_error. Return to it. We have to
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/* We are inside _dl_catch_error. Return to it. We have to
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duplicate the error string since it might be allocated on the
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duplicate the error string since it might be allocated on the
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stack. The object name is always a string constant. */
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stack. The object name is always a string constant. */
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size_t len_objname = strlen (objname) + 1;
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size_t len_objname = strlen (objname) + 1;
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size_t len_errstring = strlen (errstring) + 1;
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size_t len_errstring = strlen (errstring) + 1;
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lcatch->errstring = (char *) malloc (len_objname + len_errstring);
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lcatch->errstring = (char *) malloc (len_objname + len_errstring);
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if (lcatch->errstring != NULL)
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if (lcatch->errstring != NULL)
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{
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{
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char *tmp;
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char *tmp;
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/* Make a copy of the object file name and the error string. */
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/* Make a copy of the object file name and the error string. */
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tmp = memcpy ((char *) lcatch->errstring,
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tmp = memcpy ((char *) lcatch->errstring,
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errstring, len_errstring);
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errstring, len_errstring);
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tmp += len_errstring;
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tmp += len_errstring;
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lcatch->objname = memcpy (tmp,
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lcatch->objname = memcpy (tmp,
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objname, len_objname);
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objname, len_objname);
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}
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}
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else
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else
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{
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{
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/* This is better than nothing. */
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/* This is better than nothing. */
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lcatch->objname = "";
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lcatch->objname = "";
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lcatch->errstring = _dl_out_of_memory;
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lcatch->errstring = _dl_out_of_memory;
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}
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}
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longjmp (lcatch->env, errcode ?: -1);
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longjmp (lcatch->env, errcode ?: -1);
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}
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}
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else
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else
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{
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{
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/* Lossage while resolving the program's own symbols is always fatal. */
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/* Lossage while resolving the program's own symbols is always fatal. */
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char buffer[1024];
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char buffer[1024];
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_dl_fatal_printf ("%s: %s: %s%s%s%s%s\n",
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_dl_fatal_printf ("%s: %s: %s%s%s%s%s\n",
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_dl_argv[0] ?: "<program name unknown>",
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_dl_argv[0] ?: "<program name unknown>",
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occation ?: N_("error while loading shared libraries"),
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occation ?: N_("error while loading shared libraries"),
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objname, *objname ? ": " : "",
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objname, *objname ? ": " : "",
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errstring, errcode ? ": " : "",
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errstring, errcode ? ": " : "",
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(errcode
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(errcode
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? __strerror_r (errcode, buffer, sizeof buffer)
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? __strerror_r (errcode, buffer, sizeof buffer)
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: ""));
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: ""));
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}
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}
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}
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}
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void
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void
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internal_function
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internal_function
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_dl_signal_cerror (int errcode, const char *objname, const char *occation,
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_dl_signal_cerror (int errcode, const char *objname, const char *occation,
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const char *errstring)
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const char *errstring)
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{
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{
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if (receiver)
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if (receiver)
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{
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{
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/* We are inside _dl_receive_error. Call the user supplied
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/* We are inside _dl_receive_error. Call the user supplied
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handler and resume the work. The receiver will still be
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handler and resume the work. The receiver will still be
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installed. */
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installed. */
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(*receiver) (errcode, objname, errstring);
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(*receiver) (errcode, objname, errstring);
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}
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}
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else
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else
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_dl_signal_error (errcode, objname, occation, errstring);
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_dl_signal_error (errcode, objname, occation, errstring);
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}
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}
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int
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int
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internal_function
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internal_function
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_dl_catch_error (const char **objname, const char **errstring,
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_dl_catch_error (const char **objname, const char **errstring,
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void (*operate) (void *), void *args)
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void (*operate) (void *), void *args)
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{
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{
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int errcode;
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int errcode;
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struct catch *volatile old;
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struct catch *volatile old;
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struct catch c;
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struct catch c;
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/* We need not handle `receiver' since setting a `catch' is handled
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/* We need not handle `receiver' since setting a `catch' is handled
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before it. */
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before it. */
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/* Some systems (e.g., SPARC) handle constructors to local variables
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/* Some systems (e.g., SPARC) handle constructors to local variables
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inefficient. So we initialize `c' by hand. */
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inefficient. So we initialize `c' by hand. */
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c.errstring = NULL;
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c.errstring = NULL;
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old = tsd_getspecific ();
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old = tsd_getspecific ();
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errcode = setjmp (c.env);
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errcode = setjmp (c.env);
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if (__builtin_expect (errcode, 0) == 0)
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if (__builtin_expect (errcode, 0) == 0)
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{
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{
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tsd_setspecific (&c);
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tsd_setspecific (&c);
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(*operate) (args);
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(*operate) (args);
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tsd_setspecific (old);
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tsd_setspecific (old);
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*objname = NULL;
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*objname = NULL;
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*errstring = NULL;
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*errstring = NULL;
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return 0;
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return 0;
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}
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}
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/* We get here only if we longjmp'd out of OPERATE. */
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/* We get here only if we longjmp'd out of OPERATE. */
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tsd_setspecific (old);
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tsd_setspecific (old);
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*objname = c.objname;
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*objname = c.objname;
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*errstring = c.errstring;
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*errstring = c.errstring;
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return errcode == -1 ? 0 : errcode;
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return errcode == -1 ? 0 : errcode;
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}
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}
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void
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void
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internal_function
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internal_function
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_dl_receive_error (receiver_fct fct, void (*operate) (void *), void *args)
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_dl_receive_error (receiver_fct fct, void (*operate) (void *), void *args)
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{
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{
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struct catch *old_catch;
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struct catch *old_catch;
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receiver_fct old_receiver;
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receiver_fct old_receiver;
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old_catch = tsd_getspecific ();
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old_catch = tsd_getspecific ();
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old_receiver = receiver;
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old_receiver = receiver;
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/* Set the new values. */
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/* Set the new values. */
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tsd_setspecific (NULL);
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tsd_setspecific (NULL);
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receiver = fct;
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receiver = fct;
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(*operate) (args);
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(*operate) (args);
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tsd_setspecific (old_catch);
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tsd_setspecific (old_catch);
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receiver = old_receiver;
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receiver = old_receiver;
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}
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}
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