File I/O would be a can of worms. But "i want to use fprintf" specifically: Stdio files don't need to be backed by Unix FD's. See eg https://www.gnu.org/softw

File I/O would be a can of worms. But "i want to use fprintf" specifically: Stdio files don't need to be backed by Unix FD's. See eg https://www.gnu.org/software/libc/manual/html_node/Other-Kinds-of-Streams.html https://www.gnu.org/software/libc/manual/html_node/Other-Kin... an eg fmemopen().