This file is indexed.

/usr/include/bobcat/errno 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.

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#ifndef INCLUDED_BOBCAT_ERRNO_
#define INCLUDED_BOBCAT_ERRNO_

    // errno.h is included to allow using errno values, like EINVAL
#include <sys/errno.h>
#include <string>
#include <sstream>
#include <iosfwd>
#include <exception>
#include <iostream>

namespace FBB
{

class Errno: public std::ostringstream, public std::exception
{
    int d_errno;
    std::string d_msg;

    mutable std::string d_what;
    
    // throw() lists below are required by the std::exception base class

    public:
        Errno();
        explicit Errno(char const *prefix); 
        explicit Errno(int errnr, char const *text = 0);
        Errno(Errno const &other);
        virtual ~Errno() throw();

        int which() const;
        char const *why() const;


        static void open(std::ifstream &in, std::string const &name,    // 1
                                std::ios::openmode mode = std::ios::in);

        static void open(std::ofstream &out, std::string const &name,   // 2
                                std::ios::openmode mode = std::ios::out);

        static void open(std::fstream &out, std::string const &name,    // 3
                                std::ios::openmode mode);

                                                // moves to private in a 
                                                // future release
        virtual char const *what() const throw();   
    private:
        void initMsg();
};

inline int Errno::which() const
{
    return d_errno;
}

inline char const *Errno::why() const
{
    return what();
}

template <typename Type>
inline Errno const &operator<<(Errno const &in, Type const &t)
{
    dynamic_cast<std::ostream &>(const_cast<Errno &>(in)) << t;
    return in;
}


// OBSOLETED, NOT REQUIRED ANYMORE

inline Errno &operator<<(std::ostream &str, Errno *(*)())
{
    return *static_cast<Errno *>(&(str << std::flush));
}

inline std::ostream &insertable(std::ostream &errnoObject)
{
    return errnoObject;
}

inline Errno *throwable()
{
    return 0;
}

} // FBB

   
#endif