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IEEE 802.11 is part of the IEEE 802 set of LAN protocols, and specifies the set of media access control (MAC) and physical layer (PHY) protocols for implementing virtual local area network (VLAN) Wi-Fi computer communication in various frequencies.
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unlockpt(3) [netbsd man page]

UNLOCKPT(3)						   BSD Library Functions Manual 					       UNLOCKPT(3)

NAME
unlockpt -- unlock the slave pseudo-terminal device LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <stdlib.h> int unlockpt(int fildes); DESCRIPTION
The unlockpt() unlocks access to the pseudo-terminal device corresponding to the master pseudo-terminal device associated with fildes. Con- forming applications must call this function before opening the slave pseudo-terminal device. RETURN VALUES
If successful, unlockpt() returns 0; otherwise a value of -1 is returned and errno is set to indicate the error. ERRORS
The unlockpt() function will fail if: [EACCESS] the corresponding pseudo-terminal device could not be accessed. [EBADF] fildes is not a valid descriptor. [EINVAL] fildes is not associated with a master pseudo-terminal device. NOTES
In NetBSD unlockpt() does nothing. SEE ALSO
ioctl(2), grantpt(3), posix_openpt(3), ptsname(3) STANDARDS
The unlockpt() function conforms to IEEE Std 1003.1-2001 (``POSIX.1''). Its first release was in X/Open Portability Guide Issue 4, Version 2 (``XPG4.2''). BSD
May 25, 2004 BSD

Check Out this Related Man Page

unlockpt(3C)						   Standard C Library Functions 					      unlockpt(3C)

NAME
unlockpt - unlock a pseudo-terminal master/slave pair SYNOPSIS
#include <stdlib.h> int unlockpt(int fildes); DESCRIPTION
The unlockpt() function unlocks the slave pseudo-terminal device associated with the master to which fildes refers. Portable applications must call unlockpt() before opening the slave side of a pseudo-terminal device. RETURN VALUES
Upon successful completion, unlockpt() returns 0. Otherwise, it returns -1 and sets errno to indicate the error. ERRORS
The unlockpt() function may fail if: EBADF The fildes argument is not a file descriptor open for writing. EINVAL The fildes argument is not associated with a master pseudo-terminal device. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |Safe | +-----------------------------+-----------------------------+ SEE ALSO
open(2), grantpt(3C), ptsname(3C), attributes(5), standards(5) STREAMS Programming Guide SunOS 5.11 14 Aug 2002 unlockpt(3C)

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