98 lines
3.2 KiB
Groff
98 lines
3.2 KiB
Groff
.\" Copyright (c) 1989, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)getpass.3 8.1 (Berkeley) 6/4/93
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.\" $FreeBSD$
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.\"
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.Dd June 4, 1993
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.Dt GETPASS 3
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.Os
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.Sh NAME
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.Nm getpass
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.Nd get a password
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.Fd #include <pwd.h>
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.Fd #include <unistd.h>
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.Ft char *
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.Fn getpass "const char *prompt"
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.Sh DESCRIPTION
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The
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.Fn getpass
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function displays a prompt to, and reads in a password from,
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.Pa /dev/tty .
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If this file is not accessible,
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.Fn getpass
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displays the prompt on the standard error output and reads from the standard
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input.
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.Pp
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The password may be up to _PASSWORD_LEN (currently 128)
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characters in length.
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Any additional
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characters and the terminating newline character are discarded.
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.Pp
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The
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.Fn getpass
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function turns off character echoing while reading the password.
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.Pp
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.Sh RETURN VALUES
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The
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.Fn getpass
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function returns a pointer to the null terminated password.
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.Sh FILES
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.Bl -tag -width /dev/tty -compact
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.It Pa /dev/tty
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.El
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.Sh SEE ALSO
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.Xr crypt 3
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.Sh HISTORY
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A
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.Fn getpass
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function appeared in
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.At v7 .
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.Sh BUGS
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The
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.Fn getpass
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function leaves its result in an internal static object and returns
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a pointer to that object.
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Subsequent calls to
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.Fn getpass
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will modify the same object.
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.Pp
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The calling process should zero the password as soon as possible to
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avoid leaving the cleartext password visible in the process's address
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space.
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.Pp
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Upon receipt of a SIGTSTP, the input buffer will be flushed, so any
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partially typed password must be retyped when the process
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continues.
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