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93 lines
2.9 KiB
C
93 lines
2.9 KiB
C
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/* Memory management for dlerror messages.
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Copyright (C) 2021 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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef _DLERROR_H
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#define _DLERROR_H
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#include <dlfcn.h>
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#include <ldsodefs.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdlib.h>
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/* Source of the errstring member in struct dl_action_result, for
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finding the right deallocation routine. */
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enum dl_action_result_errstring_source
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{
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dl_action_result_errstring_constant, /* String literal, no deallocation. */
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dl_action_result_errstring_rtld, /* libc in the primary namespace. */
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dl_action_result_errstring_local, /* libc in the current namespace. */
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};
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struct dl_action_result
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{
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int errcode;
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char errstring_source;
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bool returned;
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const char *objname;
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char *errstring;
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};
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/* Used to free the errstring member of struct dl_action_result in the
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dl_action_result_errstring_rtld case. */
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static inline void
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dl_error_free (void *ptr)
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{
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#ifdef SHARED
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/* In the shared case, ld.so may use a different malloc than this
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namespace. */
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GLRO (dl_error_free (ptr));
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#else
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/* Call the implementation directly. It still has to check for
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pointers which cannot be freed, so do not call free directly
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here. */
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_dl_error_free (ptr);
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#endif
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}
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/* Deallocate RESULT->errstring, leaving *RESULT itself allocated. */
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static inline void
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dl_action_result_errstring_free (struct dl_action_result *result)
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{
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switch (result->errstring_source)
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{
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case dl_action_result_errstring_constant:
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break;
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case dl_action_result_errstring_rtld:
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dl_error_free (result->errstring);
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break;
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case dl_action_result_errstring_local:
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free (result->errstring);
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break;
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}
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}
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/* Stand-in for an error result object whose allocation failed. No
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precise message can be reported for this, but an error must still
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be signaled. */
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static struct dl_action_result *const dl_action_result_malloc_failed
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__attribute__ ((unused)) = (struct dl_action_result *) (intptr_t) -1;
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/* Thread-local variable for storing dlfcn failures for subsequent
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reporting via dlerror. */
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extern __thread struct dl_action_result *__libc_dlerror_result
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attribute_tls_model_ie;
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void __libc_dlerror_result_free (void) attribute_hidden;
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#endif /* _DLERROR_H */
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