utils.cpp
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/* Copyright (C) 2019
*
* This file is part of the osdev components suite
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include "utils.h"
// std
#include <libgen.h>
#include <unistd.h>
#include <sstream>
#include <linux/limits.h>
using namespace osdev::components::mqtt;
std::string getPathToBinary(int pid)
{
static const int sMaxPath = PATH_MAX;
pid_t p = pid;
if (-1 == pid)
{
p = getpid();
}
std::ostringstream oss;
oss << "/proc/" << p << "/exe";
char buf[sMaxPath] = { 0 };
ssize_t r = readlink(oss.str().c_str(), buf, sMaxPath);
if (-1 == r)
{
// "readlink failed"
}
if (r >= sMaxPath)
{
buf[sMaxPath - 1] = '\0'; // make the buffer 0 terminated
// "path is too long"
}
return dirname(buf);
}