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Diffstat (limited to 'src/libdwfl/dwfl_error.c')
| -rw-r--r-- | src/libdwfl/dwfl_error.c | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/src/libdwfl/dwfl_error.c b/src/libdwfl/dwfl_error.c new file mode 100644 index 00000000..966c9901 --- /dev/null +++ b/src/libdwfl/dwfl_error.c @@ -0,0 +1,189 @@ +/* Error handling in libdwfl. + Copyright (C) 2005-2010 Red Hat, Inc. + This file is part of Red Hat elfutils. + + Red Hat elfutils is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by the + Free Software Foundation; version 2 of the License. + + Red Hat elfutils 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 + General Public License for more details. + + You should have received a copy of the GNU General Public License along + with Red Hat elfutils; if not, write to the Free Software Foundation, + Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA. + + In addition, as a special exception, Red Hat, Inc. gives You the + additional right to link the code of Red Hat elfutils with code licensed + under any Open Source Initiative certified open source license + (http://www.opensource.org/licenses/index.php) which requires the + distribution of source code with any binary distribution and to + distribute linked combinations of the two. Non-GPL Code permitted under + this exception must only link to the code of Red Hat elfutils through + those well defined interfaces identified in the file named EXCEPTION + found in the source code files (the "Approved Interfaces"). The files + of Non-GPL Code may instantiate templates or use macros or inline + functions from the Approved Interfaces without causing the resulting + work to be covered by the GNU General Public License. Only Red Hat, + Inc. may make changes or additions to the list of Approved Interfaces. + Red Hat's grant of this exception is conditioned upon your not adding + any new exceptions. If you wish to add a new Approved Interface or + exception, please contact Red Hat. You must obey the GNU General Public + License in all respects for all of the Red Hat elfutils code and other + code used in conjunction with Red Hat elfutils except the Non-GPL Code + covered by this exception. If you modify this file, you may extend this + exception to your version of the file, but you are not obligated to do + so. If you do not wish to provide this exception without modification, + you must delete this exception statement from your version and license + this file solely under the GPL without exception. + + Red Hat elfutils is an included package of the Open Invention Network. + An included package of the Open Invention Network is a package for which + Open Invention Network licensees cross-license their patents. No patent + license is granted, either expressly or impliedly, by designation as an + included package. Should you wish to participate in the Open Invention + Network licensing program, please visit www.openinventionnetwork.com + <http://www.openinventionnetwork.com>. */ + +#ifdef HAVE_CONFIG_H +# include <config.h> +#endif + +#include <assert.h> +#include <libintl.h> +#include <stdbool.h> +#include <stdint.h> +#include <stdlib.h> +#include <errno.h> + +#include "libdwflP.h" + + +/* The error number. */ +#ifdef __APPLE__ +static int global_error; +#else +static __thread int global_error; +#endif + + +int +dwfl_errno (void) +{ + int result = global_error; + global_error = DWFL_E_NOERROR; + return result; +} +INTDEF (dwfl_errno) + + +static const struct msgtable +{ +#define DWFL_ERROR(name, text) char msg_##name[sizeof text]; + DWFL_ERRORS +#undef DWFL_ERROR +} msgtable = + { +#define DWFL_ERROR(name, text) text, + DWFL_ERRORS +#undef DWFL_ERROR + }; +#define msgstr (&msgtable.msg_NOERROR[0]) + +static const uint_fast16_t msgidx[] = +{ +#define DWFL_ERROR(name, text) \ + [DWFL_E_##name] = offsetof (struct msgtable, msg_##name), + DWFL_ERRORS +#undef DWFL_ERROR +}; +#define nmsgidx (sizeof msgidx / sizeof msgidx[0]) + + +static inline int +canonicalize (Dwfl_Error error) +{ + unsigned int value; + + switch (error) + { + default: + value = error; + if ((value &~ 0xffff) != 0) + break; + assert (value < nmsgidx); + break; + case DWFL_E_ERRNO: + value = DWFL_E (ERRNO, errno); + break; + case DWFL_E_LIBELF: + value = DWFL_E (LIBELF, elf_errno ()); + break; + case DWFL_E_LIBDW: + value = DWFL_E (LIBDW, INTUSE(dwarf_errno) ()); + break; +#if 0 + DWFL_E_LIBEBL: + value = DWFL_E (LIBEBL, ebl_errno ()); + break; +#endif + } + + return value; +} + +int +internal_function +__libdwfl_canon_error (Dwfl_Error error) +{ + return canonicalize (error); +} + +void +internal_function +__libdwfl_seterrno (Dwfl_Error error) +{ + global_error = canonicalize (error); +} + + +const char * +dwfl_errmsg (error) + int error; +{ + if (error == 0 || error == -1) + { + int last_error = global_error; + + if (error == 0 && last_error == 0) + return NULL; + + error = last_error; + global_error = DWFL_E_NOERROR; + } + + switch (error &~ 0xffff) + { + case OTHER_ERROR (ERRNO): +#ifdef __BIONIC__ + strerror_r (error & 0xffff, "bad", 0); + return "bad"; +#else + return strerror_r (error & 0xffff, "bad", 0); +#endif + case OTHER_ERROR (LIBELF): + return elf_errmsg (error & 0xffff); + case OTHER_ERROR (LIBDW): + return INTUSE(dwarf_errmsg) (error & 0xffff); +#if 0 + case OTHER_ERROR (LIBEBL): + return ebl_errmsg (error & 0xffff); +#endif + } + + return _(&msgstr[msgidx[(unsigned int) error < nmsgidx + ? error : DWFL_E_UNKNOWN_ERROR]]); +} +INTDEF (dwfl_errmsg) |