ee7649c5ac
Bionic's getauxval(...) implementation returns zero when entries are missing. Zero can be a valid value, so there is no unambiguous way of detecting an error. Since glibc 2.19, errno is set to ENOENT when an entry is missing to make it possible to detect this. Bionic should match this behavior as code in the Linux ecosystem will start relying on it to check for the presence of newly added entries. Change-Id: Ic1efe29bc45fc87489274c96c4d2193f3a7b8854 Signed-off-by: Daniel Micay <danielmicay@gmail.com>
46 lines
1.8 KiB
C++
46 lines
1.8 KiB
C++
/*
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* Copyright (C) 2013 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <stddef.h>
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#include <sys/cdefs.h>
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#include <sys/auxv.h>
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#include <private/bionic_auxv.h>
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#include <elf.h>
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#include <errno.h>
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__LIBC_HIDDEN__ ElfW(auxv_t)* __libc_auxv = NULL;
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extern "C" unsigned long int getauxval(unsigned long int type) {
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for (ElfW(auxv_t)* v = __libc_auxv; v->a_type != AT_NULL; ++v) {
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if (v->a_type == type) {
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return v->a_un.a_val;
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}
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}
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errno = ENOENT;
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return 0;
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}
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