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


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:

void do_operation1(int fd);

char data[DATA_MAX] = { /* embedded binary data */ };
int fd = addr_to_fd(data, DATA_MAX);

/* ... operate on fd ... */

What system call, or calls, can I use to accomplish this?


You should Check out shm_open().

By : Enquimot

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.

This video can help you solving your question :)
By: admin