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#ifndef UNIQUE_FD_H
#define UNIQUE_FD_H
#include <sys/file.h>
#include <unistd.h>
#include "exceptions.h"
struct unique_fd {
int _fd;
unique_fd( const unique_fd &rhs )=delete;
unique_fd & operator=( const unique_fd &rhs )=delete;
public:
explicit unique_fd( int fd=-1, const char *exception_message=nullptr ) : _fd( fd>=0 ? fd : -1 )
{
if( _fd<0 && exception_message )
throw errno_exception( exception_message );
}
// Movers
explicit unique_fd( unique_fd &&rhs )
{
_fd=rhs._fd;
rhs._fd=-1;
}
unique_fd & operator=( unique_fd &&rhs )
{
_fd=rhs._fd;
rhs._fd=-1;
return *this;
}
// Destructor
~unique_fd()
{
if( _fd>=0 )
if( close(_fd)<0 )
throw errno_exception( "Close failed" );
}
int get() const { return _fd; }
int release()
{
int ret=get();
_fd=-1;
return ret;
}
operator bool() const { return _fd>=0; }
// File related operations
bool flock( int operation )
{
if( ::flock( get(), operation )<0 ) {
if( errno==EWOULDBLOCK )
return false;
throw errno_exception( "flock failed" );
}
return true;
}
};
#endif // UNIQUE_FD_H
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