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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

 

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