system.hh

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#ifndef UTILMM_SYSTEM_HH
#define UTILMM_SYSTEM_HH

#include <boost/noncopyable.hpp>
#include <boost/filesystem/path.hpp>

namespace utilmm
{
    class unix_error : public std::exception
    {
        char m_desc[512];
        void init_description(std::string const& desc);

    public:
        explicit unix_error(std::string const& desc, int error);
        explicit unix_error(std::string const& desc);
        explicit unix_error(int error);
        explicit unix_error();
        ~unix_error() throw ();
        
        int error() const;
        char const* what() const throw();

    private:
        int m_error;
    };
    
    class auto_close : boost::noncopyable
    {
    public:
        auto_close();
        explicit auto_close(int fileno);
        explicit auto_close(FILE* stream);
        ~auto_close();
        
        template<typename T> T handle()  const;
            
        void  close();

        void  reset(int fd);

        void  reset(FILE* stream);

        void  detach();

    private:
        int m_fileno;
        FILE* m_stream;
    };
    template<> 
        FILE* auto_close::handle<FILE*>() const;
    template<> 
        int   auto_close::handle<int>()   const;

    class tempfile : boost::noncopyable
    {
        boost::filesystem::path m_path;
        auto_close              m_guard;
        
    public:
        tempfile();

        ~tempfile();

        tempfile(std::string const& basename);

        FILE* detach();

        static FILE* mkstemp(std::string const& base, boost::filesystem::path& path);

        boost::filesystem::path path() const;

        FILE* handle() const;
        
        static FILE* create();
    };
}

#endif