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
       See the RATIONALE section for posix_openpt().
FUTURE DIRECTIONS
       None.
SEE ALSO
       grantpt(), open(), posix_openpt(), ptsname()
       The Base Definitions volume of POSIX.1-2008, <stdlib.h>
COPYRIGHT
       Portions of this text are reprinted and reproduced in  electronic  form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri-
       cal and Electronics Engineers,  Inc  and  The  Open  Group.   (This  is
       POSIX.1-2008  with  the  2013  Technical Corrigendum 1 applied.) 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.unix.org/online.html .
       Any  typographical  or  formatting  errors that appear in this page are
       most likely to have been introduced during the conversion of the source
       files  to  man page format. To report such errors, see https://www.ker-
       nel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group                  2013                         UNLOCKPT(3P)