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/* dlerror -- Return error detail for failing <dlfcn.h> functions.
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 <link.h>
#include <dlfcn.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
static int last_errcode;
static const char *last_errstring;
static const char *last_object_name;
char *
dlerror (void)
{
static char *buf;
char *ret;
if (buf)
{
free (buf);
buf = NULL;
}
if (! last_errstring)
return NULL;
if (last_errcode == 0 && ! last_object_name)
ret = (char *) last_errstring;
else if (last_errcode == 0)
ret = (asprintf (&buf, "%s: %s", last_object_name, last_errstring) == -1
? NULL : buf);
else if (! last_object_name)
ret = (asprintf (&buf, "%s: %s",
last_errstring, strerror (last_errcode)) == -1
? NULL : buf);
else
ret = (asprintf (&buf, "%s: %s: %s",
last_object_name, last_errstring,
strerror (last_errcode)) == -1
? NULL : buf);
/* Reset the error indicator. */
free (last_errstring);
last_errstring = NULL;
return ret;
}
int
_dlerror_run (void (*operate) (void))
{
if (last_errstring != NULL)
/* Free the error string from the last failed command. This can
happen if `dlerror' was not run after an error was found. */
free (last_errstring);
last_errcode = _dl_catch_error (&last_errstring, &last_object_name,
operate);
return last_errstring != NULL;
}
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