unlockpt

Section: C Library Functions (3)
Updated: 2023-02-05
Index Return to Main Contents
 

NAME

unlockpt - unlock a pseudoterminal master/slave pair  

LIBRARY

Standard C library (libc, -lc)  

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
    glibc 2.23 and earlier:
        _XOPEN_SOURCE
 

DESCRIPTION

The unlockpt() function unlocks the slave pseudoterminal device corresponding to the master pseudoterminal referred to by the file descriptor 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 to indicate the error.  

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 since glibc 2.1.  

ATTRIBUTES

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

 

STANDARDS

POSIX.1-2001, POSIX.1-2008.  

SEE ALSO

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

 

Index

NAME
LIBRARY
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
VERSIONS
ATTRIBUTES
STANDARDS
SEE ALSO
This document was created by man2html, using the manual pages.
Time: 20:37:54 GMT, April 27, 2024