mirror of https://github.com/mkerrisk/man-pages
82 lines
1.5 KiB
Groff
82 lines
1.5 KiB
Groff
.\" %%%LICENSE_START(PUBLIC_DOMAIN)
|
|
.\" This page is in the public domain. - aeb
|
|
.\" %%%LICENSE_END
|
|
.\"
|
|
.TH UNLOCKPT 3 2017-07-13 "" "Linux Programmer's Manual"
|
|
.SH NAME
|
|
unlockpt \- unlock a pseudoterminal master/slave pair
|
|
.SH SYNOPSIS
|
|
.B #define _XOPEN_SOURCE
|
|
.br
|
|
.B #include <stdlib.h>
|
|
.PP
|
|
.BI "int unlockpt(int " fd ");"
|
|
.PP
|
|
.in -4n
|
|
Feature Test Macro Requirements for glibc (see
|
|
.BR feature_test_macros (7)):
|
|
.in
|
|
.PP
|
|
.ad l
|
|
.BR unlockpt ():
|
|
.br
|
|
.RS 4
|
|
Since glibc 2.24:
|
|
_XOPEN_SOURCE\ >=\ 500 ||
|
|
(_XOPEN_SOURCE\ &&\ _XOPEN_SOURCE_EXTENDED)
|
|
.br
|
|
Glibc 2.23 and earlier:
|
|
_XOPEN_SOURCE
|
|
.RE
|
|
.ad
|
|
.SH DESCRIPTION
|
|
The
|
|
.BR unlockpt ()
|
|
function unlocks the slave pseudoterminal device
|
|
corresponding to the master pseudoterminal referred to by the file descriptor
|
|
.IR fd .
|
|
.PP
|
|
.BR unlockpt ()
|
|
should be called before opening the slave side of a pseudoterminal.
|
|
.SH RETURN VALUE
|
|
When successful,
|
|
.BR unlockpt ()
|
|
returns 0.
|
|
Otherwise, it returns \-1 and sets
|
|
.I errno
|
|
appropriately.
|
|
.SH ERRORS
|
|
.TP
|
|
.B EBADF
|
|
The
|
|
.I fd
|
|
argument is not a file descriptor open for writing.
|
|
.TP
|
|
.B EINVAL
|
|
The
|
|
.I fd
|
|
argument is not associated with a master pseudoterminal.
|
|
.SH VERSIONS
|
|
.BR unlockpt ()
|
|
is provided in glibc since version 2.1.
|
|
.SH ATTRIBUTES
|
|
For an explanation of the terms used in this section, see
|
|
.BR attributes (7).
|
|
.TS
|
|
allbox;
|
|
lb lb lb
|
|
l l l.
|
|
Interface Attribute Value
|
|
T{
|
|
.BR unlockpt ()
|
|
T} Thread safety MT-Safe
|
|
.TE
|
|
.SH CONFORMING TO
|
|
POSIX.1-2001, POSIX.1-2008.
|
|
.SH SEE ALSO
|
|
.BR grantpt (3),
|
|
.BR posix_openpt (3),
|
|
.BR ptsname (3),
|
|
.BR pts (4),
|
|
.BR pty (7)
|