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56 lines
2.1 KiB
56 lines
2.1 KiB
/* |
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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 <private/bionic_globals.h> |
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#include <elf.h> |
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#include <errno.h> |
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// This function needs to be safe to call before TLS is set up, so it can't |
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// access errno or the stack protector. |
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__attribute__((no_stack_protector)) |
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__LIBC_HIDDEN__ unsigned long __bionic_getauxval(unsigned long type, bool& exists) { |
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for (ElfW(auxv_t)* v = __libc_shared_globals()->auxv; v->a_type != AT_NULL; ++v) { |
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if (v->a_type == type) { |
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exists = true; |
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return v->a_un.a_val; |
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} |
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} |
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exists = false; |
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return 0; |
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} |
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extern "C" unsigned long getauxval(unsigned long type) { |
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bool exists; |
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unsigned long result = __bionic_getauxval(type, exists); |
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if (!exists) errno = ENOENT; |
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return result; |
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}
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