mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-23 11:18:54 +00:00
98 lines
3.2 KiB
Groff
98 lines
3.2 KiB
Groff
.\" 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
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd June 4, 1993
|
|
.Dt GETPASS 3
|
|
.Os
|
|
.Sh NAME
|
|
.Nm getpass
|
|
.Nd get a password
|
|
.Sh LIBRARY
|
|
.Lb libc
|
|
.Sh SYNOPSIS
|
|
.Fd #include <pwd.h>
|
|
.Fd #include <unistd.h>
|
|
.Ft char *
|
|
.Fn getpass "const char *prompt"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Fn getpass
|
|
function displays a prompt to, and reads in a password from,
|
|
.Pa /dev/tty .
|
|
If this file is not accessible,
|
|
.Fn getpass
|
|
displays the prompt on the standard error output and reads from the standard
|
|
input.
|
|
.Pp
|
|
The password may be up to _PASSWORD_LEN (currently 128)
|
|
characters in length.
|
|
Any additional
|
|
characters and the terminating newline character are discarded.
|
|
.Pp
|
|
The
|
|
.Fn getpass
|
|
function turns off character echoing while reading the password.
|
|
.Pp
|
|
.Sh RETURN VALUES
|
|
The
|
|
.Fn getpass
|
|
function returns a pointer to the null terminated password.
|
|
.Sh FILES
|
|
.Bl -tag -width /dev/tty -compact
|
|
.It Pa /dev/tty
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr crypt 3
|
|
.Sh HISTORY
|
|
A
|
|
.Fn getpass
|
|
function appeared in
|
|
.At v7 .
|
|
.Sh BUGS
|
|
The
|
|
.Fn getpass
|
|
function leaves its result in an internal static object and returns
|
|
a pointer to that object.
|
|
Subsequent calls to
|
|
.Fn getpass
|
|
will modify the same object.
|
|
.Pp
|
|
The calling process should zero the password as soon as possible to
|
|
avoid leaving the cleartext password visible in the process's address
|
|
space.
|
|
.Pp
|
|
Upon receipt of a SIGTSTP, the input buffer will be flushed, so any
|
|
partially typed password must be retyped when the process
|
|
continues.
|