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.TH GETPASS 3 "6 Marzo 2019" Linux "Manual del Programador de Linux"
.SH NOMBRE
getpass \- obtiene una contraseña
.SH SINOPSIS
\fB#include \fP
.PP
\fBchar *getpass(const char *\fP\fIprompt\fP\fB);\fP
.PP
.RS -4
Requisitos de Macros de Prueba de Características para glibc (véase
\fBfeature_test_macros\fP(7)):
.RE
.PP
\fBgetpass\fP():
.ad l
.RS 4
.PD 0
.TP 4
Desde glibc 2.2.2:
.nf
_XOPEN_SOURCE && ! (_POSIX_C_SOURCE\ >=\ 200112L)
|| /* Glibc since 2.19: */ _DEFAULT_SOURCE
|| /* Glibc versions <= 2.19: */ _BSD_SOURCE
.fi
.TP 4
Antes de glibc 2.2.2:
none
.PD
.RE
.ad b
.SH DESCRIPCIÓN
This function is obsolete. Do not use it. If you want to read input
without terminal echoing enabled, see the description of the \fIECHO\fP flag in
\fBtermios\fP(3).
.PP
La función \fBgetpass\fP() abre el fichero \fI/dev/tty\fP (la terminal de control
del proceso), escribe la cadena \fIprompt\fP, desactiva el eco, lee una linea
(la "contraseña"), restablece el estado de la terminal y cierra \fI/dev/tty\fP
de nuevo.
.SH "VALOR DEVUELTO"
The function \fBgetpass\fP() returns a pointer to a static buffer containing
(the first \fBPASS_MAX\fP 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, \fIerrno\fP is set
appropriately, and NULL is returned.
.SH ERRORES
La función puede fallar si
.TP
\fBENXIO\fP
El proceso no tiene una terminal de control.
.SH ARCHIVOS
.\" .SH HISTORY
.\" A
.\" .BR getpass ()
.\" function appeared in Version 7 AT&T UNIX.
\fI/dev/tty\fP
.SH ATRIBUTOS
Para obtener una explicación de los términos usados en esta sección, véase
\fBattributes\fP(7).
.TS
allbox;
lb lb lb
l l l.
Interfaz Atributo Valor
T{
\fBgetpass\fP()
T} Seguridad del hilo MT\-Unsafe term
.TE
.SH "CONFORME A"
Present in SUSv2, but marked LEGACY. Removed in POSIX.1\-2001.
.SH NOTAS
.\" 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.
.
In the GNU C library implementation, if \fI/dev/tty\fP cannot be opened, the
prompt is written to \fIstderr\fP and the password is read from \fIstdin\fP.
There is no limit on the length of the password. Line editing is not
disabled.
.PP
.\" Libc4 and libc5 have never supported
.\" .B PASS_MAX
.\" or
.\" .BR _SC_PASS_MAX .
According to SUSv2, the value of \fBPASS_MAX\fP must be defined in
\fI\fP in case it is smaller than 8, and can in any case be
obtained using \fIsysconf(_SC_PASS_MAX)\fP. However, POSIX.2 withdraws the
constants \fBPASS_MAX\fP and \fB_SC_PASS_MAX\fP, and the function \fBgetpass\fP().
The glibc version accepts \fB_SC_PASS_MAX\fP and returns \fBBUFSIZ\fP (e.g.,
8192).
.SH ERRORES
El proceso que llama a esta función debería poner a cero todos los
caracteres de la contraseña tan pronto como le fuera posible para evitar
dejar la contraseña sin cifrar visible en el espacio de direcciones del
proceso.
.SH "VÉASE TAMBIÉN"
\fBcrypt\fP(3)
.SH COLOFÓN
Esta página es parte de la versión 5.10 del proyecto Linux
\fIman\-pages\fP. Puede encontrar una descripción del proyecto, información
sobre cómo informar errores y la última versión de esta página en
\%https://www.kernel.org/doc/man\-pages/.
.PP
.SH TRADUCCIÓN
La traducción al español de esta página del manual fue creada por
Gerardo Aburruzaga García ,
Miguel Pérez Ibars
y
Marcos Fouces
.
.PP
Esta traducción es documentación libre; lea la
.UR https://www.gnu.org/licenses/gpl-3.0.html
GNU General Public License Version 3
.UE
o posterior con respecto a las condiciones de copyright.
No existe NINGUNA RESPONSABILIDAD.
.PP
Si encuentra algún error en la traducción de esta página del manual, envíe un
correo electrónico a
.MT debian-l10n-spanish@lists.debian.org
.ME .