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-'\" t
-.\" %%%LICENSE_START(PUBLIC_DOMAIN)
-.\" This page is in the public domain. - aeb
-.\" %%%LICENSE_END
-.\"
-.TH unlockpt 3 (date) "Linux man-pages (unreleased)"
-.SH NAME
-unlockpt \- unlock a pseudoterminal master/slave pair
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #define _XOPEN_SOURCE
-.B #include <stdlib.h>
-.P
-.BI "int unlockpt(int " fd );
-.fi
-.P
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.BR unlockpt ():
-.nf
-    Since glibc 2.24:
-        _XOPEN_SOURCE >= 500
-.\"        || (_XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED)
-    glibc 2.23 and earlier:
-        _XOPEN_SOURCE
-.fi
-.SH DESCRIPTION
-The
-.BR unlockpt ()
-function unlocks the slave pseudoterminal device
-corresponding to the master pseudoterminal referred to by the file descriptor
-.IR fd .
-.P
-.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
-to indicate the error.
-.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 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 unlockpt ()
-T}	Thread safety	MT-Safe
-.TE
-.SH STANDARDS
-POSIX.1-2008.
-.SH HISTORY
-glibc 2.1.
-POSIX.1-2001.
-.SH SEE ALSO
-.BR grantpt (3),
-.BR posix_openpt (3),
-.BR ptsname (3),
-.BR pts (4),
-.BR pty (7)