diff options
author | Aliaksey Kandratsenka <alk@tut.by> | 2014-04-12 18:05:59 -0700 |
---|---|---|
committer | Aliaksey Kandratsenka <alk@tut.by> | 2014-04-12 18:05:59 -0700 |
commit | aeef3b44201ba663c19ca1c97792b724346e84a9 (patch) | |
tree | dd8fb3b279030f4890f507329dceeb5c13f30dad /src/getenv_safe.h | |
parent | 125e5ed58b72550e6b74e0139c2c3dd5e262a6ec (diff) | |
download | gperftools-aeef3b44201ba663c19ca1c97792b724346e84a9.tar.gz |
issue-610: introduced TCMallocGetenvSafe
This is version of GetenvBeforeMain that's available to C code.
Diffstat (limited to 'src/getenv_safe.h')
-rw-r--r-- | src/getenv_safe.h | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/src/getenv_safe.h b/src/getenv_safe.h new file mode 100644 index 0000000..3b9f4db --- /dev/null +++ b/src/getenv_safe.h @@ -0,0 +1,63 @@ +/* -*- 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 |