PRINTF

Section: Linux Programmer's Manual (3)
Updated: 29 November 1993
Index Return to Main Contents
 

NAME

getpass - get a password  

SYNOPSIS

#include <pwd.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 character are discarded. (This may be different in Linux.)

Getpass turns off character echoing while reading the password.

 

RETURN VALUES

Getpass returns a pointer to the null terminated password.  

FILES

/dev/tty  

SEE ALSO

crypt(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.


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUES
FILES
SEE ALSO
HISTORY
BUGS

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