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-'\" t
-.\" Copyright (c) 2000 Andries Brouwer (aeb@cwi.nl)
-.\"
-.\" SPDX-License-Identifier: GPL-2.0-or-later
-.\"
-.TH getpass 3 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-getpass \- get a password
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <unistd.h>
-.P
-.BI "[[deprecated]] char *getpass(const char *" prompt );
-.fi
-.P
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.BR getpass ():
-.nf
- Since glibc 2.2.2:
- _XOPEN_SOURCE && ! (_POSIX_C_SOURCE >= 200112L)
- || /* glibc >= 2.19: */ _DEFAULT_SOURCE
- || /* glibc <= 2.19: */ _BSD_SOURCE
- Before glibc 2.2.2:
- none
-.fi
-.SH DESCRIPTION
-This function is obsolete.
-Do not use it.
-See NOTES.
-If you want to read input without terminal echoing enabled,
-see the description of the
-.I ECHO
-flag in
-.BR termios (3).
-.P
-The
-.BR getpass ()
-function opens
-.I /dev/tty
-(the controlling terminal of the process), outputs the string
-.IR prompt ,
-turns off echoing, reads one line (the "password"),
-restores the terminal state and closes
-.I /dev/tty
-again.
-.SH RETURN VALUE
-The function
-.BR getpass ()
-returns a pointer to a static buffer containing (the first
-.B PASS_MAX
-bytes of) the password without the trailing
-newline, terminated by a null byte (\[aq]\e0\[aq]).
-This buffer may be overwritten by a following call.
-On error, the terminal state is restored,
-.I errno
-is set to indicate the error, and NULL is returned.
-.SH ERRORS
-.TP
-.B ENXIO
-The process does not have a controlling terminal.
-.SH FILES
-.I /dev/tty
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface Attribute Value
-T{
-.na
-.nh
-.BR getpass ()
-T} Thread safety MT-Unsafe term
-.TE
-.SH STANDARDS
-None.
-.SH HISTORY
-Version 7 AT&T UNIX.
-Present in SUSv2, but marked LEGACY.
-Removed in POSIX.1-2001.
-.SH NOTES
-.\" For libc4 and libc5, the prompt is not written to
-.\" .I /dev/tty
-.\" but to
-.\" .IR stderr .
-.\" Moreover, if
-.\" .I /dev/tty
-.\" cannot be opened, the password is read from
-.\" .IR stdin .
-.\" The static buffer has length 128 so that only the first 127
-.\" bytes of the password are returned.
-.\" While reading the password, signal generation
-.\" .RB ( SIGINT ,
-.\" .BR SIGQUIT ,
-.\" .BR SIGSTOP ,
-.\" .BR SIGTSTP )
-.\" is disabled and the corresponding characters
-.\" (usually control-C, control-\e, control-Z and control-Y)
-.\" are transmitted as part of the password.
-.\" Since libc 5.4.19 also line editing is disabled, so that also
-.\" backspace and the like will be seen as part of the password.
-You should use instead
-.BR readpassphrase (3bsd),
-provided by
-.IR libbsd .
-.P
-In the GNU C library implementation, if
-.I /dev/tty
-cannot be opened, the prompt is written to
-.I stderr
-and the password is read from
-.IR stdin .
-There is no limit on the length of the password.
-Line editing is not disabled.
-.P
-According to SUSv2, the value of
-.B PASS_MAX
-must be defined in
-.I <limits.h>
-in case it is smaller than 8, and can in any case be obtained using
-.IR sysconf(_SC_PASS_MAX) .
-However, POSIX.2 withdraws the constants
-.B PASS_MAX
-and
-.BR _SC_PASS_MAX ,
-and the function
-.BR getpass ().
-.\" Libc4 and libc5 have never supported
-.\" .B PASS_MAX
-.\" or
-.\" .BR _SC_PASS_MAX .
-The glibc version accepts
-.B _SC_PASS_MAX
-and returns
-.B BUFSIZ
-(e.g., 8192).
-.SH BUGS
-The calling process should zero the password as soon as possible to avoid
-leaving the cleartext password visible in the process's address space.
-.SH SEE ALSO
-.BR crypt (3)