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

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

15       #include <stdlib.h>
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17       int unlockpt(int fildes);
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DESCRIPTION

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

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

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

41       None.
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APPLICATION USAGE

44       None.
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RATIONALE

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

50       None.
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SEE ALSO

53       grantpt(), open(), posix_openpt(), ptsname()
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55       The Base Definitions volume of POSIX.1‐2017, <stdlib.h>
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58       Portions of this text are reprinted and reproduced in  electronic  form
59       from  IEEE Std 1003.1-2017, Standard for Information Technology -- Por‐
60       table Operating System Interface (POSIX), The Open Group Base  Specifi‐
61       cations  Issue  7, 2018 Edition, Copyright (C) 2018 by the Institute of
62       Electrical and Electronics Engineers, Inc and The Open Group.   In  the
63       event of any discrepancy between this version and the original IEEE and
64       The Open Group Standard, the original IEEE and The Open Group  Standard
65       is  the  referee document. The original Standard can be obtained online
66       at http://www.opengroup.org/unix/online.html .
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68       Any typographical or formatting errors that appear  in  this  page  are
69       most likely to have been introduced during the conversion of the source
70       files to man page format. To report such errors,  see  https://www.ker‐
71       nel.org/doc/man-pages/reporting_bugs.html .
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75IEEE/The Open Group                  2017                         UNLOCKPT(3P)
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