unlockpt(3p) — Linux manual page

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-terminal device.

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       None.

RATIONALE

       See the RATIONALE section for posix_openpt(3p).

FUTURE DIRECTIONS

       None.

SEE ALSO

       grantpt(3p), open(3p), posix_openpt(3p), ptsname(3p)

       The Base Definitions volume of POSIX.1‐2017, stdlib.h(0p)

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic
       form from IEEE Std 1003.1-2017, Standard for Information
       Technology -- Portable Operating System Interface (POSIX), The
       Open Group Base Specifications Issue 7, 2018 Edition, Copyright
       (C) 2018 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 .

       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.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group               2017                      UNLOCKPT(3P)

Pages that refer to this page: stdlib.h(0p), grantpt(3p), open(3p), posix_openpt(3p), ptsname(3p)

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