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// Copyright (c) 2006, Google Inc.
// 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.
//
// ---
// Author: Mike Burrows
#ifndef _SYSINFO_H_
#define _SYSINFO_H_
#include <time.h>
#include <unistd.h> // for pid_t
#include <stddef.h> // for size_t
#include <limits.h> // for PATH_MAX
#include "base/basictypes.h"
// This getenv prefers using /proc/self/environ to 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.
// Note that /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.
const char* GetenvBeforeMain(const char* name);
// A ProcMapsIterator abstracts access to /proc/maps for a given
// process. Needs to be stack-allocatable and avoid using stdio/malloc
// so it can be used in the google stack dumper.
class ProcMapsIterator {
public:
static const size_t kBufSize = PATH_MAX + 1024;
// Create a new iterator for the specified pid
explicit ProcMapsIterator(pid_t pid);
// Create an iterator with specified storage (for use in signal
// handler). "buffer" should point to an area of size kBufSize
ProcMapsIterator(pid_t pid, char *buffer);
// Returns true if the iterator successfully initialized;
bool Valid() const { return fd_ != -1; }
// Returns a pointer to the most recently parsed line. Only valid
// after Next() returns true, and until the iterator is destroyed or
// Next() is called again.
const char *CurrentLine() const { return stext_; }
// Find the next entry in /proc/maps; return true if found or false
// if at the end of the file.
//
// Any of the result pointers can be NULL if you're not interested
// in those values.
//
// If "flags" and "filename" are passed, they end up pointing to
// storage within the ProcMapsIterator that is valid only until the
// iterator is destroyed or Next() is called again. The caller may
// modify the contents of these strings (up as far as the first NUL,
// and only until the subsequent call to Next()) if desired.
// The offsets are all uint64 in order to handle the case of a
// 32-bit process running on a 64-bit kernel
bool Next(uint64 *start, uint64 *end, char **flags,
uint64 *offset, int64 *inode, char **filename);
~ProcMapsIterator();
private:
void Init(pid_t pid, char *buffer);
char *ibuf_; // input buffer
char *stext_; // start of text
char *etext_; // end of text
char *nextline_; // start of next line
char *ebuf_; // end of buffer (1 char for a nul)
int fd_; // filehandle on /proc/*/maps
char flags_[10];
char* dynamic_ibuf_; // dynamically-allocated ibuf_
};
#endif /* #ifndef _SYSINFO_H_ */
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