| /* |
| * 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 |
| |
| /* 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 unsecure environment variables. This should be used when |
| * running setuid programs. */ |
| extern void linker_env_secure(void); |
| |
| #endif /* LINKER_ENVIRON_H */ |