1UNLOCKPT(3P)               POSIX Programmer's Manual              UNLOCKPT(3P)
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PROLOG

6       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
7       implementation of this interface may differ (consult the  corresponding
8       Linux  manual page for details of Linux behavior), or the interface may
9       not be implemented on Linux.
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NAME

13       unlockpt — unlock a pseudo-terminal master/slave pair
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SYNOPSIS

16       #include <stdlib.h>
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18       int unlockpt(int fildes);
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DESCRIPTION

21       The unlockpt() function shall unlock the slave  pseudo-terminal  device
22       associated with the master to which fildes refers.
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24       Conforming  applications  shall ensure that they call unlockpt() before
25       opening the slave side of a pseudo-terminal device.
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RETURN VALUE

28       Upon successful completion, unlockpt() shall return  0.  Otherwise,  it
29       shall return −1 and set errno to indicate the error.
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ERRORS

32       The unlockpt() function may fail if:
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34       EBADF  The fildes argument is not a file descriptor open for writing.
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36       EINVAL The  fildes argument is not associated with a master pseudo-ter‐
37              minal device.
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39       The following sections are informative.
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EXAMPLES

42       None.
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APPLICATION USAGE

45       None.
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RATIONALE

48       See the RATIONALE section for posix_openpt().
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FUTURE DIRECTIONS

51       None.
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SEE ALSO

54       grantpt(), open(), posix_openpt(), ptsname()
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56       The Base Definitions volume of POSIX.1‐2008, <stdlib.h>
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59       Portions of this text are reprinted and reproduced in  electronic  form
60       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
61       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
62       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
63       cal and Electronics Engineers,  Inc  and  The  Open  Group.   (This  is
64       POSIX.1-2008  with  the  2013  Technical Corrigendum 1 applied.) In the
65       event of any discrepancy between this version and the original IEEE and
66       The  Open Group Standard, the original IEEE and The Open Group Standard
67       is the referee document. The original Standard can be  obtained  online
68       at http://www.unix.org/online.html .
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70       Any  typographical  or  formatting  errors that appear in this page are
71       most likely to have been introduced during the conversion of the source
72       files  to  man page format. To report such errors, see https://www.ker‐
73       nel.org/doc/man-pages/reporting_bugs.html .
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77IEEE/The Open Group                  2013                         UNLOCKPT(3P)
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