Linux cli command unlockpt

➡ A Linux man page (short for manual page) is a form of software documentation found on Linux and Unix-like operating systems. This man-page explains the command unlockpt and provides detailed information about the command unlockpt, system calls, library functions, and other aspects of the system, including usage, options, and examples of _. You can access this man page by typing man followed by the unlockpt.

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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.

ATTRIBUTES

For an explanation of the terms used in this section, see attributes(7).

InterfaceAttributeValue

unlockpt()

Thread safetyMT-Safe

STANDARDS

POSIX.1-2008.

HISTORY

glibc 2.1. POSIX.1-2001.

SEE ALSO

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

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