Updated: 2022/Sep/29

Please read Privacy Policy. It's for your privacy.

UNLOCKPT(3)                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.  Conforming
     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").

NetBSD 10.99                     May 25, 2004                     NetBSD 10.99