C command-line password input

Question

I want to allow users to enter password using command-line interface. but I don't want to display this password on screen (or display "****").

How to do it in C? Thanks.

Update:

I'm working on Linux only. So I don't actually care about Win or other systems. I tried Lucas' solution and it worked fine. However, I still have another question:

1. If this is a single process & single thread app, changing setting of termios affects different terminals?

2. How about 1 process - multi threads, multi processes - multi threads?

Thanks very much.

Answer 1

If your system provides it, getpass is an option:

#include <unistd.h>
/* ... */
char *password = getpass("Password: ");

This will not display anything as characters are typed.