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    <p>In the Linux world, masking isn't usually done with asterisks, normally echoing is just turned off and the terminal displays blanks E.g. if you use <code>su</code> or log into a virtual terminal etc.</p> <p>There is a library function to handle getting passwords, it won't mask the password with asterisks but will disable echoing of the password to terminal. I pulled this out of a linux book I have. I believe its part of the posix standard </p> <blockquote> <pre><code>#include &lt;unistd.h&gt; char *getpass(const char *prompt); /*Returns pointer to statically allocated input password string on success, or NULL on error*/ </code></pre> <p>The getpass() function first disables echoing and all processing of terminal special characters (such as the interrupt character, normally Control-C). </p> <p>It then prints the string pointed to by prompt, and reads a line of input, returning the null-terminated input string with the trailing newline stripped, as its function result.</p> </blockquote> <p>A google search for getpass() has a reference to the GNU implementation (should be in most linux distros) and some sample code for implementing your own if need be </p> <p><a href="http://www.gnu.org/s/hello/manual/libc/getpass.html" rel="noreferrer">http://www.gnu.org/s/hello/manual/libc/getpass.html</a></p> <p>Their example for rolling your own:</p> <pre><code>#include &lt;termios.h&gt; #include &lt;stdio.h&gt; ssize_t my_getpass (char **lineptr, size_t *n, FILE *stream) { struct termios old, new; int nread; /* Turn echoing off and fail if we can't. */ if (tcgetattr (fileno (stream), &amp;old) != 0) return -1; new = old; new.c_lflag &amp;= ~ECHO; if (tcsetattr (fileno (stream), TCSAFLUSH, &amp;new) != 0) return -1; /* Read the password. */ nread = getline (lineptr, n, stream); /* Restore terminal. */ (void) tcsetattr (fileno (stream), TCSAFLUSH, &amp;old); return nread; } </code></pre> <p>If need be you could use this as the basis as modify it to display asterisks.</p>
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    1. COAccording to man getpass function is obsolete: "This function is obsolete. Do not use it."
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    2. COOn Mac OS X 10.7.5, getpass() returns an invalid pointer which will crash the program if you try to use it.
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    3. COAlso, for some receive tcgetattr is returning ENOTTY on stdin (fileno=0) when running from the command line!
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