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/* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* DataDifferential Utility Library
*
* Copyright (C) 2011 Data Differential, http://datadifferential.com/
* 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.
*
* * The names of its contributors may not 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.
*
*/
#include "gear_config.h"
#include "util/pidfile.hpp"
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cerrno>
#include <fcntl.h>
#include <iostream>
#include <sstream>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
extern "C" {
char pid_file[1024 * 4]= { 0 };
static void remove_pidfile(void)
{
if (pid_file[0])
{
if (unlink(pid_file) == -1)
{
std::cerr << "Could not remove pidfile: " << pid_file << "(" << strerror(errno) << ")" << std::endl;
}
pid_file[0]= 0;
}
}
}
namespace datadifferential {
namespace util {
Pidfile::Pidfile(const std::string &arg) :
_last_errno(0),
_filename(arg)
{
}
Pidfile::~Pidfile()
{
if (not _filename.empty())
{
if (access(_filename.c_str(), F_OK) == -1)
{
std::stringstream error_stream;
error_stream << "Could not access the pid file: " << _filename << "(" << strerror(errno) << ")";
_error_message= error_stream.str();
}
else if (unlink(_filename.c_str()) == -1)
{
std::stringstream error_stream;
error_stream << "Could not remove the pid file: " << _filename << "(" << strerror(errno) << ")";
_error_message= error_stream.str();
}
}
pid_file[0]= 0;
}
bool Pidfile::create()
{
if (_filename.empty())
{
return true;
}
if (access(_filename.c_str(), F_OK) == 0)
{
if (unlink(_filename.c_str()) == -1)
{
_last_errno= errno;
std::stringstream error_stream;
error_stream << "Unable to remove exisiting file:" << _filename << "(" << strerror(errno) << ")";
_error_message= error_stream.str();
return false;
}
}
int oflags= O_CREAT|O_WRONLY|O_TRUNC;
#ifdef HAVE_O_CLOEXEC
oflags= oflags | O_CLOEXEC;
#endif
int file;
if ((file = open(_filename.c_str(), oflags, S_IRWXU|S_IRGRP|S_IROTH)) < 0)
{
_last_errno= errno;
std::stringstream error_stream;
error_stream << "Could not open pid file for writing: " << _filename << "(" << strerror(errno) << ")";
_error_message= error_stream.str();
return false;
}
char buffer[BUFSIZ];
unsigned long temp= static_cast<unsigned long>(getpid());
int length= snprintf(buffer, sizeof(buffer), "%lu\n", temp);
if (write(file, buffer, length) != length)
{
_last_errno= errno;
std::stringstream error_stream;
error_stream << "Could not write pid to file: " << _filename << "(" << strerror(errno) << ")";
_error_message= error_stream.str();
close(file);
return false;
}
if (close(file) < 0)
{
_last_errno= errno;
_error_message+= "Could not close() file after writing pid to it: ";
_error_message+= _filename;
return false;
}
snprintf(pid_file, sizeof(pid_file), "%s", _filename.c_str());
atexit(remove_pidfile);
return true;
}
} /* namespace util */
} /* namespace datadifferential */
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