/usr/include/bobcat/ifdstreambuf is in libbobcat-dev 3.19.01-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 | #ifndef INCLUDED_BOBCAT_IFDSTREAMBUF_
#define INCLUDED_BOBCAT_IFDSTREAMBUF_
#include <streambuf>
namespace FBB
{    
class IFdStreambuf: public std::streambuf
{
    public:
            // Mode defines what to do with the file descriptor at
            // destruction-time or when the default open is
            // called. CLOSE_FD will close the fd, KEEP_FD will leave the
            // fd as-is. When open is called with a Mode argument, then
            // the provided argument is used for the actual fd. The Mode
            // specified at the constructor is therefore only used for the
            // mode-less open() call and for the destructor.
        enum Mode
        {
            CLOSE_FD,
            KEEP_FD,
        };
    private:
        Mode        d_mode;
        int         d_fd;
        size_t      d_n;
        char*       d_buffer;
    public:
        IFdStreambuf();
        explicit IFdStreambuf(Mode mode);
        explicit IFdStreambuf(int fd, size_t n = 1);
        IFdStreambuf(int fd, Mode mode, size_t n = 1);
        IFdStreambuf(IFdStreambuf const &other) = delete;
        ~IFdStreambuf();
        IFdStreambuf &operator=(IFdStreambuf const &other) = delete;
        void close();                                           // .f
        void open(int xfd, Mode mode, size_t n = 1);
        void open(int xfd, size_t n = 1);                       // .f
        
        int fd() const;                                         // .f
    private:
        virtual int underflow();
        virtual std::streamsize xsgetn(char *dest, std::streamsize n);
        void cleanup(Mode mode);
};
inline void IFdStreambuf::open(int xfd, size_t n)
{
    open(xfd, d_mode, n);
}
inline void IFdStreambuf::close()
{
    cleanup(CLOSE_FD);
}
inline int IFdStreambuf::fd() const
{
    return d_fd;
}
} // FBB
#endif
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