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/* Error handling for runtime dynamic linker.
Copyright (C) 1995, 1996 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.
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.
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., 675 Mass Ave,
Cambridge, MA 02139, USA. */
#include <stddef.h>
#include <link.h>
#include <setjmp.h>
#include <stdlib.h>
#include <string.h>
/* 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. */
};
/* 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;
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
{
/* 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 c = { errstring: NULL, objname: NULL };
errcode = setjmp (c.env);
if (errcode == 0)
{
catch = &c;
(*operate) ();
catch = NULL;
*errstring = NULL;
*objname = NULL;
return 0;
}
/* We get here only if we longjmp'd out of OPERATE. */
*errstring = c.errstring;
*objname = c.objname;
return errcode == -1 ? 0 : errcode;
}
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