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 ALSOgrantpt(), 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)
