How to Create a C fstream from a POSIX File Descriptor?

How to Construct a C fstream from a POSIX File Descriptor?

Creating a C fstream from a POSIX file descriptor requires consideration. While it may appear straightforward, the implementation can be intricate.

Standard C Approach

The standard C library does not provide a direct method to create an fstream from a file descriptor. However, some implementations, such as libstdc , may offer a non-standard extension constructor that accepts a file descriptor or a FILE* pointer as input.

Libstdc Solution

Libstdc provides the __gnu_cxx::stdio_filebuf class template, which inherits from std::basic_streambuf and has a constructor that associates a stream buffer with a POSIX file descriptor:

An example using this constructor:

Microsoft Visual C Solution

Microsoft Visual C also offers a non-standard ifstream constructor that accepts a FILE* pointer:

You can use this constructor along with _fdopen to create an ifstream from a file descriptor:

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