1997-02-27 07:32:31 +00:00
|
|
|
.\" Copyright (c) 1989, 1991, 1993
|
|
|
|
|
.\" The Regents of the University of California. All rights reserved.
|
|
|
|
|
.\"
|
|
|
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
|
|
|
.\" modification, are permitted provided that the following conditions
|
|
|
|
|
.\" are met:
|
|
|
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
|
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
|
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
|
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
|
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
|
|
|
.\" 3. All advertising materials mentioning features or use of this software
|
|
|
|
|
.\" must display the following acknowledgement:
|
|
|
|
|
.\" This product includes software developed by the University of
|
|
|
|
|
.\" California, Berkeley and its contributors.
|
|
|
|
|
.\" 4. Neither the name of the University nor the names of its contributors
|
|
|
|
|
.\" may be used to endorse or promote products derived from this software
|
|
|
|
|
.\" without specific prior written permission.
|
|
|
|
|
.\"
|
|
|
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
|
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
|
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
|
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
|
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
|
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
|
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
|
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
|
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
|
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
|
|
|
.\" SUCH DAMAGE.
|
|
|
|
|
.\"
|
|
|
|
|
.\" @(#)getpass.3 8.1 (Berkeley) 6/4/93
|
|
|
|
|
.\"
|
|
|
|
|
.TH GETPASS 3 "25 February 1997" GNO "Library Routines"
|
|
|
|
|
.SH NAME
|
|
|
|
|
.BR getpass
|
|
|
|
|
\- get a password
|
|
|
|
|
.SH SYNOPSIS
|
|
|
|
|
#include <pwd.h>
|
|
|
|
|
.br
|
|
|
|
|
#include <unistd.h>
|
|
|
|
|
.sp 1
|
|
|
|
|
char *\fBgetpass\fR (const char *\fIprompt\fR);
|
|
|
|
|
.SH DESCRIPTION
|
|
|
|
|
The
|
|
|
|
|
.BR getpass
|
|
|
|
|
function displays a prompt to, and reads in a password from,
|
|
|
|
|
.BR \&.tty .
|
|
|
|
|
If this device is not accessible,
|
|
|
|
|
.BR getpass
|
|
|
|
|
displays the prompt on the standard error output and reads from the standard
|
|
|
|
|
input.
|
|
|
|
|
.LP
|
|
|
|
|
The password may be up to _PASSWORD_LEN (currently 128)
|
|
|
|
|
characters in length.
|
|
|
|
|
Any additional
|
|
|
|
|
characters and the terminating newline character are discarded.
|
|
|
|
|
.LP
|
|
|
|
|
.BR Getpass
|
|
|
|
|
turns off character echoing while reading the password.
|
|
|
|
|
.LP
|
|
|
|
|
.SH RETURN VALUES
|
|
|
|
|
.BR Getpass
|
|
|
|
|
returns a pointer to the null terminated password.
|
|
|
|
|
.SH SEE ALSO
|
|
|
|
|
.BR crypt (3)
|
|
|
|
|
.SH HISTORY
|
|
|
|
|
A
|
|
|
|
|
.BR getpass
|
1997-10-04 04:40:10 +00:00
|
|
|
function appeared in Version 7 AT&T UNIX.
|
1997-02-27 07:32:31 +00:00
|
|
|
.SH BUGS
|
|
|
|
|
The
|
|
|
|
|
.BR getpass
|
|
|
|
|
function leaves its result in an internal static object and returns
|
|
|
|
|
a pointer to that object.
|
|
|
|
|
Subsequent calls to
|
|
|
|
|
.BR getpass
|
|
|
|
|
will modify the same object.
|
|
|
|
|
.LP
|
|
|
|
|
The calling process should zero the password as soon as possible to
|
|
|
|
|
avoid leaving the cleartext password visible in the process's address
|
|
|
|
|
space.
|
|
|
|
|
.LP
|
|
|
|
|
Upon receipt of a SIGTSTP, the input buffer will be flushed, so any
|
|
|
|
|
partially typed password must be retyped when the process
|
|
|
|
|
continues.
|
