18a206c81d
I still want to break linker_format out into its own library so we can reuse it for malloc debugging and so forth. (There are many similar pieces of code in bionic, but the linker's one seems to be the most complete/functional.) Change-Id: If3721853d28937c8e821ca1d23cf200e228a409a
51 lines
2.3 KiB
C
51 lines
2.3 KiB
C
/*
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* Copyright (C) 2010 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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#ifndef LINKER_ENVIRON_H
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#define LINKER_ENVIRON_H
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// Call this function before anything else. 'environment_and_aux_vectors'
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// must point to the environment block in the ELF data block. The function
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// returns the start of the aux vectors after the environment block.
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extern unsigned* linker_env_init(unsigned* environment_and_aux_vectors);
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// Unset a given environment variable. In case the variable is defined
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// multiple times, unset all instances. This modifies the environment
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// block, so any pointer returned by linker_env_get() after this call
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// might become invalid.
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extern void linker_env_unset(const char* name);
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// Returns the value of environment variable 'name' if defined and not
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// empty, or NULL otherwise. Note that the returned pointer may become
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// invalid if linker_env_unset() is called after this function.
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extern const char* linker_env_get(const char* name);
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// Returns the value of this program's AT_SECURE variable.
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extern bool get_AT_SECURE();
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#endif /* LINKER_ENVIRON_H */
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