/usr/include/bobcat/ifdstreambuf is in libbobcat-dev 2.20.01-1.
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 73 74 | #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();
            void open(int xfd, Mode mode, size_t n = 1);
            void open(int xfd, size_t n = 1);
            
            int fd() const;
        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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