mirror of
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64 lines
2.7 KiB
C++
64 lines
2.7 KiB
C++
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/* -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*-
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* Copyright (c) 2014, gperftools Contributors
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Google Inc. nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef GETENV_SAFE_H
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#define GETENV_SAFE_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* This getenv function is safe to call before the C runtime is initialized.
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* On Windows, it utilizes GetEnvironmentVariable() and on unix it uses
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* /proc/self/environ instead calling getenv(). It's intended to be used in
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* routines that run before main(), when the state required for getenv() may
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* not be set up yet. In particular, errno isn't set up until relatively late
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* (after the pthreads library has a chance to make it threadsafe), and
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* getenv() doesn't work until then.
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* On some platforms, this call will utilize the same, static buffer for
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* repeated GetenvBeforeMain() calls. Callers should not expect pointers from
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* this routine to be long lived.
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* Note that on unix, /proc only has the environment at the time the
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* application was started, so this routine ignores setenv() calls/etc. Also
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* note it only reads the first 16K of the environment.
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*
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* NOTE: this is version of GetenvBeforeMain that's usable from
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* C. Implementation is in sysinfo.cc
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*/
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const char* TCMallocGetenvSafe(const char* name);
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#ifdef __cplusplus
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}
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#endif
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#endif
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