| Austin Schuh | 745610d | 2015-09-06 18:19:50 -0700 | [diff] [blame] | 1 | /* -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- |
| 2 | * Copyright (c) 2014, gperftools Contributors |
| 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 are |
| 7 | * met: |
| 8 | * |
| 9 | * * Redistributions of source code must retain the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer. |
| 11 | * * Redistributions in binary form must reproduce the above |
| 12 | * copyright notice, this list of conditions and the following disclaimer |
| 13 | * in the documentation and/or other materials provided with the |
| 14 | * distribution. |
| 15 | * * Neither the name of Google Inc. nor the names of its |
| 16 | * contributors may be used to endorse or promote products derived from |
| 17 | * this software without specific prior written permission. |
| 18 | * |
| 19 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 20 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 21 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 22 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 23 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 24 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 25 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 26 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 27 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 28 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 29 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 30 | */ |
| 31 | |
| 32 | #ifndef GETENV_SAFE_H |
| 33 | #define GETENV_SAFE_H |
| 34 | |
| 35 | #ifdef __cplusplus |
| 36 | extern "C" { |
| 37 | #endif |
| 38 | |
| 39 | /* |
| 40 | * This getenv function is safe to call before the C runtime is initialized. |
| 41 | * On Windows, it utilizes GetEnvironmentVariable() and on unix it uses |
| 42 | * /proc/self/environ instead calling getenv(). It's intended to be used in |
| 43 | * routines that run before main(), when the state required for getenv() may |
| 44 | * not be set up yet. In particular, errno isn't set up until relatively late |
| 45 | * (after the pthreads library has a chance to make it threadsafe), and |
| 46 | * getenv() doesn't work until then. |
| 47 | * On some platforms, this call will utilize the same, static buffer for |
| 48 | * repeated GetenvBeforeMain() calls. Callers should not expect pointers from |
| 49 | * this routine to be long lived. |
| 50 | * Note that on unix, /proc only has the environment at the time the |
| 51 | * application was started, so this routine ignores setenv() calls/etc. Also |
| 52 | * note it only reads the first 16K of the environment. |
| 53 | * |
| 54 | * NOTE: this is version of GetenvBeforeMain that's usable from |
| 55 | * C. Implementation is in sysinfo.cc |
| 56 | */ |
| 57 | const char* TCMallocGetenvSafe(const char* name); |
| 58 | |
| 59 | #ifdef __cplusplus |
| 60 | } |
| 61 | #endif |
| 62 | |
| 63 | #endif |