UNLOCKPT(3) Library Functions Manual UNLOCKPT(3)
unlockpt -- unlock the slave pseudo-terminal device
Standard C Library (libc, -lc)
The unlockpt() unlocks access to the pseudo-terminal device corresponding
to the master pseudo-terminal device associated with fildes. Conforming
applications must call this function before opening the slave pseudo-
If successful, unlockpt() returns 0; otherwise a value of -1 is returned
and errno is set to indicate the error.
The unlockpt() function will fail if:
[EACCESS] the corresponding pseudo-terminal device could not be
[EBADF] fildes is not a valid descriptor.
[EINVAL] fildes is not associated with a master pseudo-terminal
In NetBSD unlockpt() does nothing.
ioctl(2), grantpt(3), posix_openpt(3), ptsname(3)
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
NetBSD 6.1.5 May 25, 2004 NetBSD 6.1.5