Is there any way that I can search for a file or a filename using a given inode number?

Question

I am taking in an inode number from a user and I have to search the file system for that file. How do I search through inode numbers. I have to do this using C and unix.

Answer 1

Traverse your filesystem's directories recursively, doing stat (or probably lstat) on each file, comparing st_ino member of struct stat to the inode number you're searching.

If you didn't have to do it in C, I would recommend find /fs/root -inum N instead.