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

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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40       The following sections are informative.
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EXAMPLES

43       None.
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APPLICATION USAGE

46       None.
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RATIONALE

49       None.
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FUTURE DIRECTIONS

52       None.
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SEE ALSO

55       grantpt(),  open(),  ptsname(),  the   Base   Definitions   volume   of
56       IEEE Std 1003.1-2001, <stdlib.h>
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59       Portions  of  this text are reprinted and reproduced in electronic form
60       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
61       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
62       Specifications Issue 6, Copyright (C) 2001-2003  by  the  Institute  of
63       Electrical  and  Electronics  Engineers, Inc and The Open Group. In the
64       event of any discrepancy between this version and the original IEEE and
65       The  Open Group Standard, the original IEEE and The Open Group Standard
66       is the referee document. The original Standard can be  obtained  online
67       at http://www.opengroup.org/unix/online.html .
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71IEEE/The Open Group                  2003                         UNLOCKPT(3P)
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