Linux.com

unlockpt.3

UNLOCKPT

Section: Linux Programmer's Manual (3)
Updated: 2008-06-14
Index Return to Main Contents
 

NAME

unlockpt - unlock a pseudo-terminal master/slave pair  

SYNOPSIS

#define _XOPEN_SOURCE

#include <stdlib.h> int unlockpt(int fd);
 

DESCRIPTION

The unlockpt() function unlocks the slave pseudo-terminal device (pty) corresponding to the master pty referred to by fd.

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

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 pty.
 

VERSIONS

unlockpt() is provided in glibc since version 2.1.  

CONFORMING TO

POSIX.1-2001.  

SEE ALSO

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

COLOPHON

This page is part of release 3.21 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.


 

Index

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

 

Comments

Subscribe to Comments Feed

Upcoming Linux Foundation Courses

  1. LFD211 Introduction to Linux for Developers
    08 Dec » 09 Dec - Virtual
    Details
  2. LFS220 Linux System Administration
    08 Dec » 11 Dec - Virtual
    Details
  3. LFD331 Developing Linux Device Drivers
    15 Dec » 19 Dec - Virtual
    Details

View All Upcoming Courses

Become an Individual Member
Check out the Friday Funnies

Sign Up For the Linux.com Newsletter


Who we are ?

The Linux Foundation is a non-profit consortium dedicated to the growth of Linux.

More About the foundation...

Frequent Questions

Join / Linux Training / Board