1 /* Error handling for runtime dynamic linker.
2 Copyright (C) 1995,96,97,98,99,2000,2001,2002 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
27 /* This structure communicates state between _dl_catch_error and
31 const char *objname; /* Object/File name. */
32 const char *errstring; /* Error detail filled in here. */
33 jmp_buf env; /* longjmp here on error. */
36 /* Multiple threads at once can use the `_dl_catch_error' function. The
37 calls can come from `_dl_map_object_deps', `_dlerror_run', or from
38 any of the libc functionality which loads dynamic objects (NSS, iconv).
39 Therefore we have to be prepared to save the state in thread-local
40 memory. The _dl_error_catch_tsd function pointer is reset by the thread
41 library so that it returns the address of a thread-local variable. */
44 /* This message we return as a last resort. We define the string in a
45 variable since we have to avoid freeing it and so have to enable
46 a pointer comparison. See below and in dlfcn/dlerror.c. */
47 const char _dl_out_of_memory[] = "out of memory";
48 INTVARDEF(_dl_out_of_memory)
51 /* This points to a function which is called when an continuable error is
52 received. Unlike the handling of `catch' this function may return.
53 The arguments will be the `errstring' and `objname'.
55 Since this functionality is not used in normal programs (only in ld.so)
56 we do not care about multi-threaded programs here. We keep this as a
58 static receiver_fct receiver;
60 #ifdef _LIBC_REENTRANT
61 # define CATCH_HOOK (*(struct catch **) (*GL(dl_error_catch_tsd)) ())
63 static struct catch *catch_hook;
64 # define CATCH_HOOK catch_hook
69 _dl_signal_error (int errcode, const char *objname, const char *occation,
70 const char *errstring)
75 errstring = N_("DYNAMIC LINKER BUG!!!");
82 /* We are inside _dl_catch_error. Return to it. We have to
83 duplicate the error string since it might be allocated on the
84 stack. The object name is always a string constant. */
85 size_t len_objname = strlen (objname) + 1;
86 size_t len_errstring = strlen (errstring) + 1;
88 lcatch->errstring = (char *) malloc (len_objname + len_errstring);
89 if (lcatch->errstring != NULL)
90 /* Make a copy of the object file name and the error string. */
91 lcatch->objname = memcpy (__mempcpy ((char *) lcatch->errstring,
92 errstring, len_errstring),
93 objname, len_objname);
96 /* This is better than nothing. */
98 lcatch->errstring = INTUSE(_dl_out_of_memory);
100 longjmp (lcatch->env, errcode ?: -1);
104 /* Lossage while resolving the program's own symbols is always fatal. */
106 _dl_fatal_printf ("%s: %s: %s%s%s%s%s\n",
107 rtld_progname ?: "<program name unknown>",
108 occation ?: N_("error while loading shared libraries"),
109 objname, *objname ? ": " : "",
110 errstring, errcode ? ": " : "",
112 ? __strerror_r (errcode, buffer, sizeof buffer)
116 INTDEF (_dl_signal_error)
121 _dl_signal_cerror (int errcode, const char *objname, const char *occation,
122 const char *errstring)
124 if (__builtin_expect (GL(dl_debug_mask)
125 & ~(DL_DEBUG_STATISTICS|DL_DEBUG_PRELINK), 0))
126 INTUSE(_dl_debug_printf) ("%s: error: %s: %s (%s)\n", objname, occation,
127 errstring, receiver ? "continued" : "fatal");
131 /* We are inside _dl_receive_error. Call the user supplied
132 handler and resume the work. The receiver will still be
134 (*receiver) (errcode, objname, errstring);
137 INTUSE(_dl_signal_error) (errcode, objname, occation, errstring);
143 _dl_catch_error (const char **objname, const char **errstring,
144 void (*operate) (void *), void *args)
147 struct catch *volatile old;
149 /* We need not handle `receiver' since setting a `catch' is handled
152 /* Some systems (e.g., SPARC) handle constructors to local variables
153 inefficient. So we initialize `c' by hand. */
156 struct catch **const catchp = &CATCH_HOOK;
158 errcode = setjmp (c.env);
159 if (__builtin_expect (errcode, 0) == 0)
169 /* We get here only if we longjmp'd out of OPERATE. */
171 *objname = c.objname;
172 *errstring = c.errstring;
173 return errcode == -1 ? 0 : errcode;
175 INTDEF (_dl_catch_error)
180 _dl_receive_error (receiver_fct fct, void (*operate) (void *), void *args)
182 struct catch **const catchp = &CATCH_HOOK;
183 struct catch *old_catch;
184 receiver_fct old_receiver;
187 old_receiver = receiver;
189 /* Set the new values. */
196 receiver = old_receiver;