| Josh Gao | 9727192 | 2019-11-06 13:15:00 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2019 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 | |
| 29 | #include<stdatomic.h> |
| 30 | |
| Josh Gao | 7596250 | 2020-01-28 13:24:33 -0800 | [diff] [blame] | 31 | #include<platform/bionic/fdtrack.h> |
| Josh Gao | 9727192 | 2019-11-06 13:15:00 -0800 | [diff] [blame] | 32 | #include<platform/bionic/reserved_signals.h> |
| 33 | |
| 34 | #include"private/bionic_fdtrack.h" |
| 35 | #include"private/bionic_tls.h" |
| 36 | #include"private/bionic_globals.h" |
| 37 | |
| 38 | _Atomic(android_fdtrack_hook_t) __android_fdtrack_hook; |
| 39 | |
| Josh Gao | dcc97c0 | 2020-12-09 14:01:13 -0800 | [diff] [blame] | 40 | bool __android_fdtrack_globally_disabled=false; |
| 41 | |
| 42 | void android_fdtrack_set_globally_enabled(bool new_value){ |
| 43 | __android_fdtrack_globally_disabled=!new_value; |
| 44 | } |
| 45 | |
| Josh Gao | 9727192 | 2019-11-06 13:15:00 -0800 | [diff] [blame] | 46 | bool android_fdtrack_get_enabled(){ |
| Josh Gao | dcc97c0 | 2020-12-09 14:01:13 -0800 | [diff] [blame] | 47 | return!__get_bionic_tls().fdtrack_disabled&&!__android_fdtrack_globally_disabled; |
| Josh Gao | 9727192 | 2019-11-06 13:15:00 -0800 | [diff] [blame] | 48 | } |
| 49 | |
| 50 | bool android_fdtrack_set_enabled(bool new_value){ |
| 51 | auto& tls= __get_bionic_tls(); |
| 52 | bool prev=!tls.fdtrack_disabled; |
| 53 | tls.fdtrack_disabled=!new_value; |
| 54 | return prev; |
| 55 | } |
| 56 | |
| 57 | bool android_fdtrack_compare_exchange_hook(android_fdtrack_hook_t* expected, |
| 58 | android_fdtrack_hook_t value){ |
| 59 | return atomic_compare_exchange_strong(&__android_fdtrack_hook, expected, value); |
| 60 | } |
| 61 | |
| 62 | void __libc_init_fdtrack(){ |
| 63 | // Register a no-op signal handler. |
| 64 | signal(BIONIC_SIGNAL_FDTRACK,[](int){}); |
| 65 | } |
