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/*
* Copyright (C) 2010 The Android Open Source Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef LINKER_ENVIRON_H
#define LINKER_ENVIRON_H
#ifdef __cplusplus
extern "C" {
#endif
/* Call this function before anything else. 'vecs' must be the pointer
* to the environment block in the ELF data block. The function returns
* the start of the aux vectors after the env block.
*/
extern unsigned* linker_env_init(unsigned* vecs);
/* Unset a given environment variable. In case the variable is defined
* multiple times, unset all instances. This modifies the environment
* block, so any pointer returned by linker_env_get() after this call
* might become invalid */
extern void linker_env_unset(const char* name);
/* Returns the value of environment variable 'name' if defined and not
* empty, or NULL otherwise. Note that the returned pointer may become
* invalid if linker_env_unset() or linker_env_secure() are called
* after this function. */
extern const char* linker_env_get(const char* name);
/* Remove insecure environment variables. This should be used when
* running setuid programs. */
extern void linker_env_secure(void);
#ifdef __cplusplus
};
#endif
#endif /* LINKER_ENVIRON_H */
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