UNLOCKPT

Section: Linux Programmer's Manual (3)
Updated: 2017-07-13
Index Return to Main Contents
 

NAME

unlockpt - unlock a pseudoterminal master/slave pair  

SYNOPSIS

#define _XOPEN_SOURCE
#include <stdlib.h>

int unlockpt(int fd);

Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

unlockpt():

Since glibc 2.24:
    _XOPEN_SOURCE >= 500 ||
        (_XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED)
Glibc 2.23 and earlier:
    _XOPEN_SOURCE
 

DESCRIPTION

The unlockpt() function unlocks the slave pseudoterminal device corresponding to the master pseudoterminal referred to by fd.

unlockpt() should be called before opening the slave side of a pseudoterminal.  

RETURN VALUE

When successful, unlockpt() returns 0. Otherwise, it returns -1 and sets errno appropriately.  

ERRORS

EBADF
The fd argument is not a file descriptor open for writing.
EINVAL
The fd argument is not associated with a master pseudoterminal.
 

VERSIONS

unlockpt() is provided in glibc since version 2.1.  

ATTRIBUTES

For an explanation of the terms used in this section, see attributes(7).
InterfaceAttributeValue
unlockpt() Thread safetyMT-Safe
 

CONFORMING TO

POSIX.1-2001, POSIX.1-2008.  

SEE ALSO

grantpt(3), posix_openpt(3), ptsname(3), pts(4), pty(7)  

COLOPHON

This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
VERSIONS
ATTRIBUTES
CONFORMING TO
SEE ALSO
COLOPHON

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Time: 06:09:37 GMT, September 21, 2018