| David 'Digit' Turner | be57559 | 2010-12-16 19:52:02 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2010 The Android Open Source Project |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * * Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * * Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in |
| 12 | * the documentation and/or other materials provided with the |
| 13 | * distribution. |
| 14 | * |
| 15 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 16 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 17 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| 18 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| 19 | * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 20 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
| 21 | * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
| 22 | * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
| 23 | * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| 24 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| 25 | * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 26 | * SUCH DAMAGE. |
| 27 | */ |
| 28 | #ifndef LINKER_ENVIRON_H |
| 29 | #define LINKER_ENVIRON_H |
| 30 | |
| 31 | /* Call this function before anything else. 'vecs' must be the pointer |
| 32 | * to the environment block in the ELF data block. The function returns |
| 33 | * the start of the aux vectors after the env block. |
| 34 | */ |
| 35 | extern unsigned* linker_env_init(unsigned* vecs); |
| 36 | |
| 37 | /* Unset a given environment variable. In case the variable is defined |
| 38 | * multiple times, unset all instances. This modifies the environment |
| 39 | * block, so any pointer returned by linker_env_get() after this call |
| 40 | * might become invalid */ |
| 41 | extern void linker_env_unset(const char* name); |
| 42 | |
| 43 | |
| 44 | /* Returns the value of environment variable 'name' if defined and not |
| 45 | * empty, or NULL otherwise. Note that the returned pointer may become |
| 46 | * invalid if linker_env_unset() or linker_env_secure() are called |
| 47 | * after this function. */ |
| 48 | extern const char* linker_env_get(const char* name); |
| 49 | |
| 50 | /* Remove unsecure environment variables. This should be used when |
| 51 | * running setuid programs. */ |
| 52 | extern void linker_env_secure(void); |
| 53 | |
| 54 | #endif /* LINKER_ENVIRON_H */ |