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94 lines
2.8 KiB
C
94 lines
2.8 KiB
C
/* Error handling for runtime dynamic linker.
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Copyright (C) 1995, 1996 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
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <stddef.h>
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#include <link.h>
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#include <setjmp.h>
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#include <string.h>
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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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const char *errstring, *objname; /* Error detail filled in here. */
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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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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
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{
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/* Lossage while resolving the program's own symbols is always fatal. */
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extern char **_dl_argv; /* Set in rtld.c at startup. */
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_dl_sysdep_fatal (_dl_argv[0] ?: "<program name unknown>",
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": error in loading shared libraries\n",
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objname ?: "", objname ? ": " : "",
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errstring, errcode ? ": " : "",
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errcode ? strerror (errcode) : "", "\n", NULL);
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}
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}
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int
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_dl_catch_error (const char **errstring,
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const char **objname,
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void (*operate) (void))
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{
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int errcode;
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struct catch c = { errstring: NULL, objname: NULL };
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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) ();
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catch = NULL;
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*errstring = *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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*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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