The unlockpt() function shall unlock the slave pseudo-terminal
device associated with the master to which fildes
refers.
Conforming applications shall ensure that they call unlockpt()
before opening the slave side of a pseudo-terminal
device.
RETURN VALUE
Upon successful completion, unlockpt() shall return 0. Otherwise,
it shall return -1 and set 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.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
grantpt() , open() , ptsname() , the Base Definitions
volume of IEEE Std 1003.1-2001, <stdlib.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group. In the
event of any discrepancy between this version and the original IEEE and
The Open Group Standard, the original IEEE and The Open Group Standard
is the referee document. The original Standard can be obtained online at
http://www.opengroup.org/unix/online.html .
