143 lines
4.0 KiB
C
143 lines
4.0 KiB
C
/* Error handling for runtime dynamic linker.
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Copyright (C) 1995, 1996, 1997, 1998 Free Software Foundation, Inc.
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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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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <link.h>
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#include <setjmp.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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/* This is the internal function we use to generate the error string. */
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extern char *_strerror_internal __P ((int, char *, size_t));
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/* This structure communicates state between _dl_catch_error and
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_dl_signal_error. */
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struct catch
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{
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char *errstring; /* Error detail filled in here. */
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const char *objname;
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jmp_buf env; /* longjmp here on error. */
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};
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/* This points to such a structure during a call to _dl_catch_error.
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During implicit startup and run-time work for needed shared libraries,
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this is null. */
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static struct catch *catch;
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/* This points to a function which is called when an error is
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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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static receiver_fct receiver;
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void
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_dl_signal_error (int errcode,
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const char *objname,
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const char *errstring)
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{
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if (! errstring)
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errstring = "DYNAMIC LINKER BUG!!!";
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if (catch)
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{
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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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stack. */
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size_t len = strlen (errstring) + 1;
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catch->errstring = malloc (len);
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if (catch->errstring != NULL)
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memcpy (catch->errstring, errstring, len);
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catch->objname = objname;
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longjmp (catch->env, errcode ?: -1);
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}
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else if (receiver)
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{
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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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installed. */
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(*receiver) (errcode, objname, errstring);
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}
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else
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{
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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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_dl_sysdep_fatal (_dl_argv[0] ?: "<program name unknown>",
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": error in loading shared libraries: ",
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objname ?: "", objname && *objname ? ": " : "",
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errstring, errcode ? ": " : "",
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(errcode
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? _strerror_internal (errcode, buffer, sizeof buffer)
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: ""), "\n", NULL);
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}
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}
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int
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_dl_catch_error (char **errstring,
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const char **objname,
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void (*operate) (void *),
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void *args)
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{
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int errcode;
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struct catch *old, c;
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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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/* 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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c.errstring = NULL;
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c.objname = NULL;
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old = catch;
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errcode = setjmp (c.env);
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if (errcode == 0)
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{
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catch = &c;
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(*operate) (args);
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catch = old;
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*errstring = NULL;
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*objname = NULL;
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return 0;
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}
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/* We get here only if we longjmp'd out of OPERATE. */
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catch = old;
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*errstring = c.errstring;
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*objname = c.objname;
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return errcode == -1 ? 0 : errcode;
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}
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void
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_dl_receive_error (receiver_fct fct, void (*operate) (void *), void *args)
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{
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struct catch *old_catch;
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receiver_fct old_receiver;
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old_catch = catch;
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old_receiver = receiver;
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/* Set the new values. */
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catch = NULL;
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receiver = fct;
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(*operate) (args);
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catch = old_catch;
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receiver = old_receiver;
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}
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