-/* Error handling for runtime dynamic linker.
- Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
+/* Error handling for runtime dynamic linker, full version.
+ Copyright (C) 1995-2019 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 Library General Public License as
- published by the Free Software Foundation; either version 2 of the
- License, or (at your option) any later version.
+ 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
- Library General Public License for more details.
+ Lesser General Public License for more details.
- You should have received a copy of the GNU Library General Public
- License along with the GNU C Library; see the file COPYING.LIB. If not,
- write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
-#include <stddef.h>
-#include <link.h>
-#include <setjmp.h>
-#include <stdlib.h>
-#include <string.h>
+/* This implementation lives in libc.so because it uses thread-local
+ data, which is not available in ld.so. It interposes the version
+ in dl-error-minimal.c after ld.so bootstrap.
-/* This structure communicates state between _dl_catch_error and
- _dl_signal_error. */
-struct catch
- {
- char *errstring; /* Error detail filled in here. */
- const char *objname;
- jmp_buf env; /* longjmp here on error. */
- };
+ The signal/catch mechanism is used by the audit framework, which
+ means that even in ld.so, not all errors are fatal. */
-/* This points to such a structure during a call to _dl_catch_error.
- During implicit startup and run-time work for needed shared libraries,
- this is null. */
-static struct catch *catch;
-
-/* This points to a function which is called when an error is
- received. Unlike the handling of `catch' this function may return.
- The arguments will be the `errstring' and `objname'. */
-static receiver_fct receiver;
-
-
-void
-_dl_signal_error (int errcode,
- const char *objname,
- const char *errstring)
-{
- if (! errstring)
- errstring = "DYNAMIC LINKER BUG!!!";
-
- if (catch)
- {
- /* We are inside _dl_catch_error. Return to it. We have to
- duplicate the error string since it might be allocated on the
- stack. */
- size_t len = strlen (errstring) + 1;
- catch->errstring = malloc (len);
- if (catch->errstring != NULL)
- memcpy (catch->errstring, errstring, len);
- catch->objname = objname;
- longjmp (catch->env, errcode ?: -1);
- }
- else if (receiver)
- {
- /* We are inside _dl_receive_error. Call the user supplied
- handler and resume the work. The receiver will still
- installed. */
- (*receiver) (errstring, objname);
- }
- else
- {
- /* Lossage while resolving the program's own symbols is always fatal. */
- extern char **_dl_argv; /* Set in rtld.c at startup. */
- _dl_sysdep_fatal (_dl_argv[0] ?: "<program name unknown>",
- ": error in loading shared libraries\n",
- objname ?: "", objname ? ": " : "",
- errstring, errcode ? ": " : "",
- errcode ? strerror (errcode) : "", "\n", NULL);
- }
-}
-
-int
-_dl_catch_error (char **errstring,
- const char **objname,
- void (*operate) (void))
-{
- int errcode;
- struct catch *old, c = { errstring: NULL, objname: NULL };
- /* We need not handle `receiver' since setting a `catch' is handle
- before it. */
-
- old = catch;
- errcode = setjmp (c.env);
- if (errcode == 0)
- {
- catch = &c;
- (*operate) ();
- catch = old;
- *errstring = NULL;
- *objname = NULL;
- return 0;
- }
-
- /* We get here only if we longjmp'd out of OPERATE. */
- catch = old;
- *errstring = c.errstring;
- *objname = c.objname;
- return errcode == -1 ? 0 : errcode;
-}
-
-void
-_dl_receive_error (receiver_fct fct, void (*operate) (void))
-{
- struct catch *old_catch;
- receiver_fct old_receiver;
-
- old_catch = catch;
- old_receiver = receiver;
-
- /* Set the new values. */
- catch = NULL;
- receiver = fct;
-
- (*operate) ();
-
- catch = old_catch;
- receiver = old_receiver;
-}
+#define DL_ERROR_BOOTSTRAP 0
+#include "dl-error-skeleton.c"
projects / thirdparty / glibc.git / blobdiff