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glibc/elf/dl-error.c
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/* Error handling for runtime dynamic linker. | |
Copyright (C) 1995-2002,2004,2005 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, write to the Free | |
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
02111-1307 USA. */ | |
#include <libintl.h> | |
#include <setjmp.h> | |
#include <stdlib.h> | |
#include <string.h> | |
#include <unistd.h> | |
#include <ldsodefs.h> | |
/* This structure communicates state between _dl_catch_error and | |
_dl_signal_error. */ | |
struct catch | |
{ | |
const char *objname; /* Object/File name. */ | |
const char *errstring; /* Error detail filled in here. */ | |
jmp_buf env; /* longjmp here on error. */ | |
}; | |
/* Multiple threads at once can use the `_dl_catch_error' function. The | |
calls can come from `_dl_map_object_deps', `_dlerror_run', or from | |
any of the libc functionality which loads dynamic objects (NSS, iconv). | |
Therefore we have to be prepared to save the state in thread-local | |
memory. The _dl_error_catch_tsd function pointer is reset by the thread | |
library so that it returns the address of a thread-local variable. */ | |
/* This message we return as a last resort. We define the string in a | |
variable since we have to avoid freeing it and so have to enable | |
a pointer comparison. See below and in dlfcn/dlerror.c. */ | |
const char _dl_out_of_memory[] = "out of memory"; | |
rtld_hidden_data_def (_dl_out_of_memory) | |
/* This points to a function which is called when an continuable error is | |
received. Unlike the handling of `catch' this function may return. | |
The arguments will be the `errstring' and `objname'. | |
Since this functionality is not used in normal programs (only in ld.so) | |
we do not care about multi-threaded programs here. We keep this as a | |
global variable. */ | |
static receiver_fct receiver; | |
#ifdef _LIBC_REENTRANT | |
# define CATCH_HOOK (*(struct catch **) (*GL(dl_error_catch_tsd)) ()) | |
#else | |
static struct catch *catch_hook; | |
# define CATCH_HOOK catch_hook | |
#endif | |
void | |
internal_function | |
_dl_signal_error (int errcode, const char *objname, const char *occation, | |
const char *errstring) | |
{ | |
struct catch *lcatch; | |
if (! errstring) | |
errstring = N_("DYNAMIC LINKER BUG!!!"); | |
lcatch = CATCH_HOOK; | |
if (objname == NULL) | |
objname = ""; | |
if (lcatch != NULL) | |
{ | |
/* We are inside _dl_catch_error. Return to it. We have to | |
duplicate the error string since it might be allocated on the | |
stack. The object name is always a string constant. */ | |
size_t len_objname = strlen (objname) + 1; | |
size_t len_errstring = strlen (errstring) + 1; | |
lcatch->errstring = (char *) malloc (len_objname + len_errstring); | |
if (lcatch->errstring != NULL) | |
/* Make a copy of the object file name and the error string. */ | |
lcatch->objname = memcpy (__mempcpy ((char *) lcatch->errstring, | |
errstring, len_errstring), | |
objname, len_objname); | |
else | |
{ | |
/* This is better than nothing. */ | |
lcatch->objname = ""; | |
lcatch->errstring = _dl_out_of_memory; | |
} | |
longjmp (lcatch->env, errcode ?: -1); | |
} | |
else | |
{ | |
/* Lossage while resolving the program's own symbols is always fatal. */ | |
char buffer[1024]; | |
_dl_fatal_printf ("%s: %s: %s%s%s%s%s\n", | |
rtld_progname ?: "<program name unknown>", | |
occation ?: N_("error while loading shared libraries"), | |
objname, *objname ? ": " : "", | |
errstring, errcode ? ": " : "", | |
(errcode | |
? __strerror_r (errcode, buffer, sizeof buffer) | |
: "")); | |
} | |
} | |
void | |
internal_function | |
_dl_signal_cerror (int errcode, const char *objname, const char *occation, | |
const char *errstring) | |
{ | |
if (__builtin_expect (GLRO(dl_debug_mask) | |
& ~(DL_DEBUG_STATISTICS|DL_DEBUG_PRELINK), 0)) | |
_dl_debug_printf ("%s: error: %s: %s (%s)\n", objname, occation, | |
errstring, receiver ? "continued" : "fatal"); | |
if (receiver) | |
{ | |
/* We are inside _dl_receive_error. Call the user supplied | |
handler and resume the work. The receiver will still be | |
installed. */ | |
(*receiver) (errcode, objname, errstring); | |
} | |
else | |
_dl_signal_error (errcode, objname, occation, errstring); | |
} | |
int | |
internal_function | |
_dl_catch_error (const char **objname, const char **errstring, | |
void (*operate) (void *), void *args) | |
{ | |
int errcode; | |
struct catch *volatile old; | |
struct catch c; | |
/* We need not handle `receiver' since setting a `catch' is handled | |
before it. */ | |
/* Some systems (e.g., SPARC) handle constructors to local variables | |
inefficient. So we initialize `c' by hand. */ | |
c.errstring = NULL; | |
struct catch **const catchp = &CATCH_HOOK; | |
old = *catchp; | |
errcode = setjmp (c.env); | |
if (__builtin_expect (errcode, 0) == 0) | |
{ | |
*catchp = &c; | |
(*operate) (args); | |
*catchp = old; | |
*objname = NULL; | |
*errstring = NULL; | |
return 0; | |
} | |
/* We get here only if we longjmp'd out of OPERATE. */ | |
*catchp = old; | |
*objname = c.objname; | |
*errstring = c.errstring; | |
return errcode == -1 ? 0 : errcode; | |
} | |
void | |
internal_function | |
_dl_receive_error (receiver_fct fct, void (*operate) (void *), void *args) | |
{ | |
struct catch **const catchp = &CATCH_HOOK; | |
struct catch *old_catch; | |
receiver_fct old_receiver; | |
old_catch = *catchp; | |
old_receiver = receiver; | |
/* Set the new values. */ | |
*catchp = NULL; | |
receiver = fct; | |
(*operate) (args); | |
*catchp = old_catch; | |
receiver = old_receiver; | |
} |