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FreeBSD 11.0 - man page for getpass (freebsd section 3)

GETPASS(3)						   BSD Library Functions Manual 						GETPASS(3)

NAME
getpass -- get a password
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <pwd.h> #include <unistd.h> char * getpass(const char *prompt);
DESCRIPTION
The getpass() function displays a prompt to, and reads in a password from, /dev/tty. If this file is not accessible, getpass() displays the prompt on the standard error output and reads from the standard input. The password may be up to _PASSWORD_LEN (currently 128) characters in length. Any additional characters and the terminating newline charac- ter are discarded. The getpass() function turns off character echoing while reading the password.
RETURN VALUES
The getpass() function returns a pointer to the null terminated password.
FILES
/dev/tty
SEE ALSO
crypt(3), readpassphrase(3)
HISTORY
A getpass() function appeared in Version 7 AT&T UNIX.
BUGS
The getpass() function leaves its result in an internal static object and returns a pointer to that object. Subsequent calls to getpass() will modify the same object. The calling process should zero the password as soon as possible to avoid leaving the cleartext password visible in the process's address space. Upon receipt of a SIGTSTP, the input buffer will be flushed, so any partially typed password must be retyped when the process continues.
BSD
June 4, 1993 BSD