How Can I Create a C fstream from a POSIX File Descriptor?

Constructing a C fstream from a POSIX File Descriptor

This inquiry presents a seemingly straightforward task that proves to be complex: constructing a C fstream from a POSIX file descriptor. Does the solution lie in a simpler approach or is there a suitable library available?

The Complexity of the Issue

According to experts, there is no standard C mechanism for this task. However, some implementations of the standard library, such as libstdc , offer non-standard extensions.

Non-Standard Solutions

The following non-standard solutions are available:

libstdc :

• Utilizes the __gnu_cxx::stdio_filebuf class template to create a file stream buffer from a file descriptor.
• Example:

__gnu_cxx::stdio_filebuf<char> filebuf(posix_handle, std::ios::in);
istream is(&amp;filebuf);

Microsoft Visual C :

• Employs the non-standard ifstream constructor that accepts a FILE* parameter.
• Example:

ifstream ifs(::_fdopen(posix_handle, "r"));

Conclusion

While there is no standard C method for this task, non-standard extensions provided by specific implementations offer viable solutions.

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