system call to map memory to a file descriptor (inverse mmap)?

Question

I want to be able to map memory to a file descriptor so I can use some existing functions that need a file descriptor. Here\'s essentially what I\'m looking for:

Answer 1

Sure, just open(argv[0], ...), scan through the file to find where your binary data starts, lseek() there and done. That file won't have the length of your binary data of course.

Answer 2

Some implementations have fmemopen(). (Then of course you have to call fileno()).

If yours doesn't, you can build it yourself with fork() and pipe().

Answer 3

You should Check out shm_open().