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- /* -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*-
- * Copyright (c) 2014, gperftools Contributors
- * 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.
- * * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * 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 GETENV_SAFE_H
- #define GETENV_SAFE_H
- #ifdef __cplusplus
- extern "C" {
- #endif
- /*
- * This getenv function is safe to call before the C runtime is initialized.
- * On Windows, it utilizes GetEnvironmentVariable() and on unix it uses
- * /proc/self/environ instead calling getenv(). It's intended to be used in
- * routines that run before main(), when the state required for getenv() may
- * not be set up yet. In particular, errno isn't set up until relatively late
- * (after the pthreads library has a chance to make it threadsafe), and
- * getenv() doesn't work until then.
- * On some platforms, this call will utilize the same, static buffer for
- * repeated GetenvBeforeMain() calls. Callers should not expect pointers from
- * this routine to be long lived.
- * Note that on unix, /proc only has the environment at the time the
- * application was started, so this routine ignores setenv() calls/etc. Also
- * note it only reads the first 16K of the environment.
- *
- * NOTE: this is version of GetenvBeforeMain that's usable from
- * C. Implementation is in sysinfo.cc
- */
- const char* TCMallocGetenvSafe(const char* name);
- #ifdef __cplusplus
- }
- #endif
- #endif
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