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