Commit 6f4e005d authored by Simon Josefsson's avatar Simon Josefsson
Browse files

(Reading a Password): Revert.

parent 266725f1
2004-10-29 Simon Josefsson <>
* minibuf.texi (Reading a Password): Revert.
2004-10-28 Richard M. Stallman <>
* frames.texi (Display Feature Testing): Explain about "vendor".
......@@ -1660,32 +1660,6 @@ The return value of @code{map-y-or-n-p} is the number of objects acted on.
To read a password to pass to another program, you can use the
function @code{read-passwd}.
@cindex password cache
Passwords are sometimes needed several times throughout an Emacs
session. Then it can be useful to avoid having to ask for a password
more than once. Passwords are entered into the password cache using
the function @code{password-cache-add}. To read a password, possibly
retrieving the password from the cache without querying the user, you
can use the function @code{password-read}. The two calls can be
combined into the function @code{password-read-and-add} that read a
password and store it in the cache.
Typically users do not use the same password for all services. The
password cache mechanism use a @samp{key} string to differentiate
among the passwords. The @samp{key} string is typically a fixed
string chosen to be related to what the password is used for. For
example, a password used when connecting to a @acronym{IMAP} mail
server called @samp{}, could use a @samp{key} string
of @samp{}. You can use any string, as long as
it is reasonably unique.
@cindex password expiry
Passwords in the cache typically expire after a while (controlled by
the variable @code{password-cache-expiry}), but you can force removal
of a password using the function @code{password-cache-remove}. This
is useful when there is a problem with the password, to avoid using
the same incorrect password from the cache in the future.
@defun read-passwd prompt &optional confirm default
This function reads a password, prompting with @var{prompt}. It does
not echo the password as the user types it; instead, it echoes @samp{.}
......@@ -1701,41 +1675,6 @@ return if the user enters empty input. If @var{default} is @code{nil},
then @code{read-passwd} returns the null string in that case.
@end defun
@defun password-read prompt key
Read a password from the user, using @code{read-passwd}, prompting
with @var{prompt}. If a password has been stored in the password
cache, using @code{password-cache-add} on the same @var{key}, it is
returned directly, without querying the user.
@end defun
@defun password-cache-add key password
Add a password to the password cache, indexed under the given
@var{key}. The password is later retrieved using @code{password-read}
called with the same @var{key}.
@end defun
@defun password-cache-remove key
Remove a password from the cache, indexed under the given @var{key}.
@end defun
@defun password-read-and-add prompt &optional key
Read a password, prompting with @var{prompt}, and possibly add it to
the cache, indexed using the @var{key} string. This is one-call
interface to @code{password-read} and @code{password-cache-add}.
@end defun
@defvar password-cache-expiry
This variable specify for how many seconds passwords are retained in
the password cache before they are expired. For high security, use a
low value (below a minute). For more lax security, use a setting of
@samp{14400} corresponding to half a work day (4 hours).
@end defvar
@defvar password-cache
This variable toggle whether or not the password cache is used at all.
The default is non-@code{nil}, i.e., to use the cache.
@end defvar
@node Minibuffer Misc
@section Minibuffer Miscellany
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