Method resolve_exec_path

src/backward.h:1295–1318

public:
    TraceResolverLinuxBase() : argv0_(get_argv0()), exec_path_(read_symlink("/proc/self/exe")) {}
    std::string resolve_exec_path(Dl_info& symbol_info) const
    {
        // mutates symbol_info.dli_fname to be filename to open and returns filename
        // to display
        if (symbol_info.dli_fname == argv0_) {
            // dladdr returns argv[0] in dli_fname for symbols contained in
            // the main executable, which is not a valid path if the
            // executable was found by a search of the PATH environment
            // variable; In that case, we actually open /proc/self/exe, which
            // is always the actual executable (even if it was deleted/replaced!)
            // but display the path that /proc/self/exe links to.
            // However, this right away reduces probability of successful symbol
            // resolution, because libbfd may try to find *.debug files in the
            // same dir, in case symbols are stripped. As a result, it may try
            // to find a file /proc/self/<exe_name>.debug, which obviously does
            // not exist. /proc/self/exe is a last resort. First load attempt
            // should go for the original executable file path.
            symbol_info.dli_fname = "/proc/self/exe";
            return exec_path_;
        }
        else {
            return symbol_info.dli_fname;
        }
    }

private:
    std::string argv0_;