unlockpt(3p) - phpMan

UNLOCKPT(3P)               POSIX Programmer's Manual              UNLOCKPT(3P)

PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the  corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.
NAME
       unlockpt - unlock a pseudo-terminal master/slave pair
SYNOPSIS
       #include <stdlib.h>
       int unlockpt(int fildes);

DESCRIPTION
       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-ter-
              minal 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 .

IEEE/The Open Group                  2003                         UNLOCKPT(3P)