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Added linux-specific is_daemon_alive() function to determine

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if a particular daemon is running.
This commit is contained in:
James Yonan 2015-09-08 22:21:26 -07:00
parent 685c7601e2
commit 8870b2477e
1 changed files with 47 additions and 0 deletions
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47
openvpn/linux/daemon_alive.hpp Normal file
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// OpenVPN -- An application to securely tunnel IP networks
// over a single port, with support for SSL/TLS-based
// session authentication and key exchange,
// packet encryption, packet authentication, and
// packet compression.
//
// Copyright (C) 2012-2015 OpenVPN Technologies, Inc.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License Version 3
// as published by the Free Software Foundation.
//
// 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 Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program in the COPYING file.
// If not, see <http://www.gnu.org/licenses/>.
#ifndef OPENVPN_LINUX_DAEMON_ALIVE_H
#define OPENVPN_LINUX_DAEMON_ALIVE_H
#include <openvpn/common/file.hpp>
#include <openvpn/common/string.hpp>
namespace openvpn {
inline bool is_daemon_alive(const std::string& cmd,
const std::string& pidfile)
{
try {
std::string pidstr = read_text(pidfile);
string::trim_crlf(pidstr);
const std::string cmdline_fn = "/proc/" + pidstr + "/cmdline";
BufferPtr cmdbuf = read_binary_linear(cmdline_fn);
const size_t len = ::strnlen((const char *)cmdbuf->c_data(), cmdbuf->size());
return cmd == std::string((const char *)cmdbuf->c_data(), len);
}
catch (const std::exception& e)
{
return false;
}
}
}
#endif