PR/50695: coypu: ctrl-c in su password input breaks shell (bash, csh)
Always restore the tty settings.

make more descriptors that we open as close-on-exec

Recognize CR as end of line too. the telnet client passes that to us instead
of linefeed.

make getpass and getpass_r print a newline like they did before.

test for both NUL and _POSIX_VDISABLE, because _POSIX_VDISABLE propagation
between different daemons and OS's does not seem reliable.

- If fd == NULL, do the dance with opening /dev/tty
- Add a flag to enter a newline when we are done.

prefer ETIMEDOUT.

add timeout.

- don't update the length of the buffer until the allocation succeeds
- print only printable characters otherwise print '?'

unconfuse lint; XXX: should really fix lint.

add GETPASS_ECHO_STAR

add getpassfd() that gives us even more fine grain control on how to get
the password.

raise signals for the tty characters that do.

Add a new getpass implementation that does not mess with signals, and
include getpass_r

block signals before playing with files. From Anon Ymous

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22280, verified by myself.

Delint.
Remove trailing ; from uses of __weak_alias(). The macro inserts this if
needed.

* use _DIAGASSERT() to check pointer arguments against NULL and file
descriptors against -1 (as appropriate).
* add actual checks which to detect stuff that would trigger_DIAGASSERT(),
and attemp

* use _DIAGASSERT() to check pointer arguments against NULL and file
descriptors against -1 (as appropriate).
* add actual checks which to detect stuff that would trigger_DIAGASSERT(),
and attempt to return a sane error condition.
* knf some code
* remove some `register' decls.

the first two items result in the addition of code similar to the
following in various functions:

_DIAGASSERT(path != NULL)
#ifdef _DIAGNOSTIC
if (path == NULL) {
errno = EFAULT;
return (-1);
}
#endif

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remove obsolete register declarations

If port provides __weak_alias(), provide an Standard C and POSIX pure
identifier namespace by renaming non standard functions and variables
such that they have a leading underscore. The library will

If port provides __weak_alias(), provide an Standard C and POSIX pure
identifier namespace by renaming non standard functions and variables
such that they have a leading underscore. The library will use those
names internally. Weak aliases are used to provide the original names
to the API.

This is only the first part of this change. It is most of the functions
which are implemented in C for all NetBSD ports. Subsequent changes are
to add the same support to the remaining C files, to assembly files, and
to the automagically generated assembly source used for system calls.
When all of the above is done, ports with weak alias support should add
a definition for __weak_alias to <sys/cdefs.h>.

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Fix RCSID's
Fix gcc warning

Signal mask was not restored correctly.
Fix from James Chacon <jmc@pobox.com> in PR #2442.

Use the POSIX signal mask interface

<sys/termios.h> -> <termios.h>

Changed <sys/signal.h> to <signal.h>