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cwd_resource.h
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/*
Copyright (C) 2011 Laszlo Kajan, Technical University of Munich, Germany
This file is part of librostlab.
librostlab is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef ROSTLAB_CWD_RESOURCE
#define ROSTLAB_CWD_RESOURCE
#include <errno.h>
#include <stdexcept>
#include <unistd.h>
#include <string.h>
namespace rostlab {
class cwd_resource
{
private:
string _olddir;
// this is a resource - disable copy contructor and copy assignment
cwd_resource( const cwd_resource& ){};
cwd_resource&
operator=(const cwd_resource&){return *this;};
public:
cwd_resource() : _olddir("") {};
cwd_resource( const string& __dirname ) : _olddir("")
{
acquire( __dirname );
}
inline void acquire( const string& __dirname ) throw (runtime_error)
{
release();
//
char *buf = NULL;
if( ( buf = getcwd( NULL, 0 ) ) == NULL ) throw runtime_error( string("failed to get working directory: ") + strerror( errno ) );
string cwd = buf; free( buf ); buf = NULL;
if( chdir( __dirname.c_str() ) ) throw runtime_error( "failed to chdir to '" + __dirname + "': " + strerror( errno ) );
_olddir = cwd;
}
inline void release() throw (runtime_error)
{
if( _olddir != "" )
{
if( chdir( _olddir.c_str() ) ) throw runtime_error( "failed to chdir to '" + _olddir + "': " + strerror( errno ) );
_olddir = "";
}
}
virtual ~cwd_resource()
{
release();
}
};
};
#endif // ROSTLAB_CWD_RESOURCE
// vim:et:ts=2:ai:
rostlab::cwd_resource::~cwd_resource
virtual ~cwd_resource()
Definition cwd_resource.h:66
rostlab::cwd_resource::cwd_resource
cwd_resource(const string &__dirname)
Definition cwd_resource.h:40
rostlab::cwd_resource::release
void release()
Definition cwd_resource.h:57
rostlab::cwd_resource::acquire
void acquire(const string &__dirname)
Definition cwd_resource.h:45
rostlab::cwd_resource::cwd_resource
cwd_resource()
Definition cwd_resource.h:38
rostlab::runtime_error
Definition rostlab_stdexcept.h:69
rostlab
Definition aux_functions.h:27